{"gene":"DIAPH1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1999,"finding":"GTP-bound RhoA activates mDia1 by disrupting mDia1's intramolecular autoinhibitory interactions; active mDia1 induces formation of thin actin stress fibers, and mDia1 and ROCK work concurrently downstream of Rho to produce stress fibers of varying thickness and density depending on the balance of the two activities.","method":"Constitutively active mDia1 expression, dominant-negative constructs, in vitro binding studies, fluorescence microscopy of actin structures","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal biochemical and cell biological methods in a foundational paper, independently replicated across multiple subsequent studies","pmids":["10559899"],"is_preprint":false},{"year":2001,"finding":"Constitutively active mDia1 (DeltaN3) is sufficient to restore force-induced focal contact formation in Rho-inhibited cells, demonstrating that mDia1 acts downstream of Rho to mediate mechanosensing-dependent focal contact growth independently of ROCK and myosin II contractility.","method":"Micropipette force application, GFP-vinculin/paxillin live imaging, expression of constitutively active mDia1 mutants, C3 transferase Rho inhibition, ROCK and myosin II pharmacological inhibition","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (live imaging, pharmacological inhibition, dominant-active mutant rescue) in a single rigorous study","pmids":["11402062"],"is_preprint":false},{"year":2001,"finding":"Active mDia1 (DeltaN3 mutant containing FH1 and FH2 regions) induces bipolar cell elongation and aligns microtubules parallel to F-actin bundles along the long cell axis; point mutations in the FH2 region abolish microtubule alignment but not actin accumulation, revealing that the FH2 domain coordinates microtubules and F-actin.","method":"Expression of constitutively active mDia1 mutants, co-expression of dominant-negative FH2 fragment, point mutagenesis, immunofluorescence of microtubules and F-actin in HeLa cells","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain mutagenesis combined with cellular phenotypic rescue, replicated in subsequent studies","pmids":["11146620"],"is_preprint":false},{"year":2001,"finding":"mDia1 localizes to the mitotic spindle in HeLa cells from prophase to telophase, independently of Rho activity; a 173-amino acid segment in the FH3 region (including Leu434 and Leu455) is necessary and sufficient for spindle localization.","method":"Immunocytochemistry with polyclonal anti-mDia1 antibody, mitotic spindle fractionation/western blot, GFP-fusion truncation mutants, point mutagenesis, C3 exoenzyme and Val14RhoA microinjection","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (biochemical fractionation, live GFP imaging, mutagenesis) in a single study","pmids":["11171383"],"is_preprint":false},{"year":2001,"finding":"mDia1 FH1 domain binds profilin in vitro and in cells; the RBD (Rho-binding domain) complexes with the C-terminal CIID module for autoinhibition; overexpression of the RBD alone causes membrane ruffling and loss of stress fibers, which is suppressed by dominant-negative Rac, indicating that the isolated RBD upregulates Rac activity.","method":"In vitro binding assays, transfection of deletion constructs, dominant-negative Rac co-expression, morphological phenotyping","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — multiple complementary approaches in a single lab, no independent replication reported in this abstract","pmids":["11707518"],"is_preprint":false},{"year":2002,"finding":"mDia1 mediates Rho-dependent Rac activation through a pathway involving Cas phosphorylation (via Src/Crk/DOCK180), and this mDia1 activity is antagonized by ROCK; expression of dominant-negative mDia1 inhibits membrane ruffle formation induced by ROCK inhibition (Y-27632).","method":"C3 exoenzyme and Y-27632 pharmacological inhibition, dominant-negative mDia1 expression, N17Rac expression, GTP-Rac pull-down assay, PP1 Src inhibitor, dominant-negative Cas and Crk-II mutants","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — epistasis established by multiple genetic/pharmacological interventions in a single rigorous study","pmids":["12021256"],"is_preprint":false},{"year":2002,"finding":"mDia1 activates serum response factor (SRF) by promoting F-actin assembly and depleting the G-actin pool; the FH2 domain (extended C-terminal region) is required for both actin polymerization and SRF activation, placing actin assembly upstream of SRF; the FH1 domain is dispensable for these functions.","method":"SRF luciferase reporter assay, actin polymerization assays, non-polymerizable actin mutant (R62D), mDia1 domain deletion constructs","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reporter assay combined with actin mutagenesis and domain deletion analysis establishing pathway order","pmids":["12429848"],"is_preprint":false},{"year":2003,"finding":"Purified mDia1 FH2-containing constructs are potent actin nucleators in vitro; the FH1 domain is required for nucleation when actin is profilin-bound; an N-terminal mDia1 construct strongly inhibits C-terminal actin nucleation, consistent with autoinhibition; RhoA partially relieves this inhibition regardless of whether it is GDP- or GTP-bound.","method":"In vitro pyrene-actin polymerization assay with purified proteins, size exclusion chromatography (multimer analysis), GST-RhoA binding","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro biochemical assay with purified proteins plus domain analysis; findings replicated by independent groups","pmids":["12906795"],"is_preprint":false},{"year":2003,"finding":"Purified mDia1 FH2 domain dimerizes and protects growing actin filament barbed ends from capping protein, enabling processive elongation; this mechanism is conserved with yeast Bni1, and dominant-active mDia1 partially complements BNI1 function in yeast.","method":"In vitro actin assembly assays, barbed-end capping protection assay, yeast complementation genetics","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in vitro with multiple assays plus in vivo genetic complementation","pmids":["14657240"],"is_preprint":false},{"year":2003,"finding":"Genetic disruption of Drf1 (mDia1) reveals compensatory upregulation of Drf3; Drf1-/- cells show fewer actin stress fibers but are more motile with more lamella and filopodia, attributable to Cdc42-mediated Drf3 activation; mDia1 loss-of-function establishes it as required for RhoA-mediated stress fiber formation in primary mouse cells.","method":"Homologous recombination gene targeting, Drf3 antibody microinjection, FRET analysis of Cdc42-Drf3 interaction, dominant-negative Drf3 variants","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO combined with FRET and rescue experiments in a single study","pmids":["12676083"],"is_preprint":false},{"year":2004,"finding":"mDia1 (Drf1) physically interacts with PKD2 via the cytoplasmic C-terminus of PKD2 and the mDia1 N-terminus; they co-localize at the mitotic spindle; mDia1 knockdown by RNAi causes loss of PKD2 from mitotic spindles and alters intracellular Ca2+ release.","method":"Yeast two-hybrid screen, co-immunoprecipitation in native and transfected cells, RNAi knockdown, immunofluorescence, intracellular Ca2+ measurement","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid identified interaction, confirmed by reciprocal co-IP plus RNAi functional consequence","pmids":["15123714"],"is_preprint":false},{"year":2005,"finding":"Crystal structure of the dimeric mDia1 regulatory N-terminal domain reveals an intertwined six-helix bundle with two armadillo-repeat DIDs; NMR and biochemical mapping show that RhoA and DAD binding sites partially overlap on the DID, explaining how RhoA activates mDia1 by competing with DAD; RhoA binding also requires a flexibly tethered arm adjacent to the DID.","method":"X-ray crystallography, NMR spectroscopy, biochemical binding assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure at atomic resolution validated by NMR and biochemical assays in a single rigorous study","pmids":["15866170"],"is_preprint":false},{"year":2006,"finding":"Autoinhibition of mDia1 regulates not only in vitro actin assembly activity but also a novel membrane-localization activity in vivo; Rho-family GTPase binding relieves autoinhibition of both activities simultaneously, establishing dual regulation of localization and biochemical function as a general DRF principle.","method":"In vitro actin assembly assays, cellular localization of GFP-tagged wild-type vs. constitutively active and autoinhibited mDia1, GTPase binding-deficient mutants","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vitro reconstitution combined with cellular localization imaging, single lab study","pmids":["16943183"],"is_preprint":false},{"year":2006,"finding":"The Rho-mDia1 pathway regulates cell polarity and focal adhesion turnover during directed migration by aligning microtubules and actin filaments, enabling delivery of Apc/active Cdc42 to the cell front and c-Src to focal adhesions; mDia1 depletion by RNAi impairs both polarization and adhesion turnover.","method":"siRNA knockdown of mDia1 in rat C6 glioma cells, expression of active mDia1, live-cell imaging of Apc, Cdc42-FRET, c-Src localization by immunofluorescence","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RNAi loss-of-function combined with active-mDia1 gain-of-function and multi-probe live imaging in a single study","pmids":["16943426"],"is_preprint":false},{"year":2007,"finding":"mDia1 is required for T lymphocyte chemotaxis and trafficking; mDia1-/- T cells show impaired actin filament formation, loss of polarity, reduced chemotaxis in vitro, and defective homing to secondary lymphoid organs in vivo despite normal integrin/chemokine receptor expression.","method":"mDia1 knockout mice, in vivo lymphocyte trafficking assay, in vitro chemotaxis, actin polymerization assay, flow cytometry","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple in vivo and in vitro phenotypic readouts, replicated in a second independent mDia1 KO study","pmids":["17682067"],"is_preprint":false},{"year":2007,"finding":"Genetic disruption of Drf1 (mDia1) in mice causes age-dependent myeloproliferative defects including splenomegaly, hypercellular fibrotic bone marrow, and expansion of monocyte/macrophage and erythroid precursor populations, demonstrating an in vivo role for mDia1 in hematopoietic progenitor regulation.","method":"Homologous recombination knockout mouse, histopathology, flow cytometric cell surface marker analysis, bone marrow cell cycle analysis","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO in vivo with multiple quantitative phenotypic readouts, replicated by related studies","pmids":["17699759"],"is_preprint":false},{"year":2007,"finding":"Galpha12/13-activated LARG associates with pericentrin and localizes to the MTOC and microtubule tracks; this Galpha12/13-LARG axis signals through RhoA to activate mDia1, which is required for MTOC polarization and microtubule dynamics in migrating fibroblasts.","method":"Galpha12/13-deficient mouse embryonic fibroblasts, co-immunoprecipitation of LARG and pericentrin, dominant-negative/constitutively active mDia1 and Galpha constructs, MTOC orientation assay, microtubule dynamics imaging","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function plus biochemical interaction and functional rescue, single lab","pmids":["17959834"],"is_preprint":false},{"year":2008,"finding":"G-actin concentration directly regulates mDia1 actin nucleation frequency: elevated free G-actin (e.g., caused by low-dose latrunculin B) increases the actin nucleation rate of mDia1 via enhanced catalytic efficiency of the FH2 domain, independent of Rho signaling; this mechanism enables rapid actin polymer restoration at sites of actin disassembly.","method":"Single-molecule live-cell imaging of mDia1, unpolymerizable actin mutants, latrunculin B treatment, simulation analysis of G-actin concentration","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-molecule imaging combined with mathematical modeling and pharmacological perturbation, single lab but rigorous quantitative approach","pmids":["18827014"],"is_preprint":false},{"year":2008,"finding":"Memo is required for RhoA GTPase and its effector mDia1 to localize to the plasma membrane at the leading edge; loss of Memo impairs mDia1-dependent lamellipodial actin network organization, adhesion site formation, and microtubule outgrowth, placing Memo upstream of the RhoA-mDia1 axis in ErbB2-dependent cell migration.","method":"siRNA knockdown of Memo in breast carcinoma cells, immunofluorescence of RhoA/mDia1 localization, MT dynamics imaging, adhesion site quantification","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — RNAi loss-of-function with multiple imaging readouts, single lab study","pmids":["18955552"],"is_preprint":false},{"year":2009,"finding":"Loss of hDia1 (mDia1) in NK cells impairs microtubule cytoskeleton organization and targeting of microtubules to the lytic synapse but does not disrupt actin assembly at the synapse or cell adhesion, revealing a specific role for hDia1 in microtubule capture at the cell periphery during NK-mediated cytotoxicity.","method":"siRNA knockdown of hDia1 in NK cells, target cell lysis assay, immunofluorescence of actin and microtubules at the lytic synapse","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — RNAi loss-of-function with phenotypic dissection; single lab, single method type","pmids":["19427913"],"is_preprint":false},{"year":2009,"finding":"mDia1 forms an inducible complex with the Src kinase Hck and WASp in chemoattractant-stimulated neutrophils; mDia1 is required for chemokine-induced Hck membrane translocation, Hck activation, and Hck-mediated WASp tyrosine phosphorylation, establishing mDia1 as a scaffold linking Rho/actin to tyrosine kinase signaling at the leading edge.","method":"Co-immunoprecipitation, mDia1-/- neutrophils, immunofluorescence of Hck localization, Hck kinase activity assay, WASp phosphorylation analysis","journal":"Biochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO combined with co-IP and multiple biochemical readouts, single lab","pmids":["19234535"],"is_preprint":false},{"year":2010,"finding":"mDia1 targets v-Src (and by implication c-Src) from the perinuclear region to focal adhesions and the cell periphery via actin filament-dependent transport; in mDia1-deficient cells, v-Src fails to translocate to the membrane, leading to impaired tyrosine phosphorylation, suppressed podosome formation, reduced transformation, and decreased tumorigenesis/invasion in vivo.","method":"mDia1-knockout mouse embryonic fibroblasts, temperature-sensitive v-Src, immunofluorescence, focus formation, soft-agar colony formation, nude mouse tumor implantation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple in vitro and in vivo oncogenic phenotypic readouts in a single study","pmids":["20679479"],"is_preprint":false},{"year":2010,"finding":"Flightless-I (Fli-I) directly binds mDia1 (and Daam1) and enhances their intrinsic actin assembly activity in vitro; Fli-I also promotes GTP-Rho-mediated relief of mDia1/Daam1 autoinhibition, identifying Fli-I as a positive cofactor for Rho-induced linear actin assembly.","method":"GST pulldown, co-immunoprecipitation, in vitro pyrene-actin polymerization assay, cell-based actin assembly assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of actin assembly plus direct binding assays and cellular validation, single lab","pmids":["20223827"],"is_preprint":false},{"year":2010,"finding":"Adenomatous polyposis coli (APC) C-terminal basic domain (APC-B) nucleates actin filaments and synergizes with mDia1; together, APC-B and mDia1 overcome the dual cellular barrier of profilin and capping protein to assemble actin, establishing APC as a mDia1 in vivo binding partner for cooperative actin nucleation.","method":"In vitro pyrene-actin nucleation assay with purified proteins, co-immunoprecipitation, EM of APC-B filaments, cell-based actin assembly assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified proteins plus cellular and biochemical interaction validation","pmids":["20566685"],"is_preprint":false},{"year":2010,"finding":"mDia1 localizes to the mitotic spindle, and single-molecule fluorescence polarization demonstrates that mDia1 undergoes helical rotation along the long-pitch axis of the actin filament during processive elongation; this rotation oscillates with F-actin helix periodicity and is unaffected by actin-bound nucleotide or profilin.","method":"Single-molecule fluorescence polarization imaging, in vitro actin elongation from immobilized mDia1","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-molecule biophysical measurement with rigorous controls; novel mechanistic finding in a high-profile journal","pmids":["21148346"],"is_preprint":false},{"year":2010,"finding":"ACTH-stimulated cortisol biosynthesis requires RhoA and DIAPH1; ACTH/cAMP increases GTP-RhoA and promotes RhoA-DIAPH1 interaction; dominant-negative RhoA or DIAPH1 siRNA impairs mitochondrial trafficking (microtubule-dependent) and reduces cortisol biosynthesis while increasing androgen secretion, establishing a RhoA-DIAPH1 axis in steroidogenic organelle dynamics.","method":"Live-cell confocal video microscopy of mitochondria, RhoA activity assay, siRNA knockdown of DIAPH1, dominant-negative RhoA overexpression, steroid hormone measurement","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging plus knockdown and dominant-negative approaches with biochemical readouts, single lab","pmids":["20591975"],"is_preprint":false},{"year":2010,"finding":"The Rho-mDia1 pathway drives Golgi complex fragmentation into ministacks; constitutively active mDia1 alone is sufficient for Golgi dispersion; active mDia1 promotes formation of Rab6-positive transport vesicles and transiently localizes to these vesicles, revealing a role for mDia1 in Golgi membrane remodeling.","method":"Constitutively active and dominant-negative mDia1 expression, RhoA activation by LPA, cytoskeletal inhibitors (latrunculin B, blebbistatin, taxol), live imaging of Golgi markers, Rab6 vesicle analysis","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — constitutively active construct plus pharmacological dissection and live imaging, single lab","pmids":["21680709"],"is_preprint":false},{"year":2011,"finding":"The cytoplasmic domain of RAGE (ctRAGE) directly binds mDia1, and this interaction—mediated by an unusual α-turn in ctRAGE—is required for RAGE ligand-stimulated AKT phosphorylation and cell proliferation/migration, establishing mDia1 as the essential membrane-proximal intracellular effector of RAGE signaling.","method":"NMR structure determination of ctRAGE, NMR mapping of ctRAGE-mDia1 interaction interface, mutagenesis of the α-turn, AKT phosphorylation and cell migration assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure plus mutagenesis and functional cell assays in a single study","pmids":["22194616"],"is_preprint":false},{"year":2011,"finding":"INF2, mDia1, and mDia2 FH1FH2C constructs all bind microtubules with high affinity (Kd < 100 nM); mDia1 shows saturating binding at ~1:3 stoichiometry (dimer:tubulin dimer) but does not bundle microtubules; microtubules moderately inhibit actin polymerization by mDia1; actin monomers do not affect mDia1 microtubule binding, demonstrating simultaneous actin and microtubule engagement.","method":"In vitro microtubule co-sedimentation assay, microtubule catastrophe rate measurement, actin polymerization assay with purified proteins","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative in vitro reconstitution with purified proteins and multiple complementary assays, single study","pmids":["21998204"],"is_preprint":false},{"year":2011,"finding":"CLIP-170 directly interacts with the FH2 domain of mDia1 and controls mDia1 recruitment to the phagocytic cup during complement receptor (alphaMbeta2/CR3)-mediated phagocytosis in macrophages; CLIP-170 knockdown reduces mDia1 recruitment and actin polymerization at the phagocytic cup.","method":"RNAi knockdown, dominant-negative CLIP-170, direct binding assay (CLIP-170-FH2 interaction), live-cell imaging of phagocytosis, immunofluorescence","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay plus RNAi and live-cell imaging, single lab","pmids":["19114595"],"is_preprint":false},{"year":2011,"finding":"mDia1 and WAVE2 directly interact with IRSp53 within filopodia (shown by FRET); mDia1 and WAVE2 synergize with IRSp53 to form filopodia; knockdown of mDia1 or WAVE2 decreases IRSp53-induced filopodium formation, establishing mDia1 as a specific SH3-domain partner of IRSp53 in filopodium biogenesis.","method":"Acceptor photobleaching FRET, siRNA knockdown, time-lapse imaging, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET-based direct interaction plus RNAi, single lab","pmids":["22179776"],"is_preprint":false},{"year":2011,"finding":"Rif GTPase directly interacts with mDia1 (but not mDia2) within filopodia to drive filopodium formation independently of Cdc42 effectors (N-WASP, IRSp53) and Rac effectors (WAVE1, WAVE2); dominant-negative mDia1 or mDia1 siRNA reduces Rif-induced filopodia.","method":"FRET in filopodia, siRNA knockdown, dominant-negative mDia1, time-lapse imaging","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET direct interaction combined with RNAi and epistasis experiments, single lab","pmids":["21339294"],"is_preprint":false},{"year":2012,"finding":"Actin-capping protein is a physiological regulator of mDia1 that promotes stable detyrosinated microtubule formation; by blocking mDia1 translocation on actin filament barbed ends, capping protein releases mDia1 to act on microtubules; knockdown of capping protein reduces stable MT levels in an mDia1-dependent manner.","method":"siRNA knockdown of mDia1 and capping protein, latrunculin A and jasplakinolide treatment, immunofluorescence of stable (Glu) MTs, mDia1 barbed-end translocation assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and RNAi manipulation with mDia1-dependent rescue, single lab","pmids":["22918941"],"is_preprint":false},{"year":2012,"finding":"mDia1 controls caveolin-1 (Cav1)/caveolae domain organization downstream of Abl kinases; mDia1 knockdown causes Cav1/caveolae clustering and defective inward trafficking upon loss of cell adhesion; constitutively active mDia1 rescues the Cav1 pool and inward trafficking in Abl-deficient cells.","method":"mDia1 siRNA knockdown, constitutively active mDia1 expression, Abl-deficient cells, live imaging of Cav1, electron microscopy of caveolae","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic knockdown plus rescue with active mDia1, single lab","pmids":["22454521"],"is_preprint":false},{"year":2012,"finding":"mDia1 is required for RAGE ligand (AGE)-induced membrane translocation of c-Src, which leads to Rac1 activation, redox phosphorylation of AKT/GSK3β, and vascular smooth muscle cell migration; mDia1 is upregulated in the neointima after vascular injury and its loss significantly reduces pathological neointimal expansion.","method":"In vivo femoral artery denudation injury in mDia1 KO and WT mice, primary murine aortic SMC culture, mDia1 siRNA, immunofluorescence of c-Src, Rac1-GTP pull-down, AKT/GSK3β phosphorylation","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO combined with mechanistic in vitro pathway dissection, multi-readout study","pmids":["22511750"],"is_preprint":false},{"year":2010,"finding":"Crystal structure of the mDia1 N-terminal regulatory domain in complex with a C-terminal FH2+DAD fragment reveals a tetrameric assembly of two interlocked N+C dimers; the structure shows that DAD engagement by the N-terminus is incompatible with actin filament formation on the FH2 domain, providing structural models for autoinhibition.","method":"X-ray crystallography, size exclusion chromatography, in-solution biochemical analysis of oligomeric state","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure combined with solution state characterization, mechanistically informative about autoinhibition","pmids":["20927338"],"is_preprint":false},{"year":2014,"finding":"DIAPH1 (mDia1) negatively regulates megakaryocyte proplatelet formation (PPF) by controlling actin and microtubule dynamics; inhibition of both DIAPH1 and ROCK/myosin II together increases PPF, revealing coordinate regulation of both cytoskeletons by these two RhoA effectors.","method":"mDia1-knockout mouse megakaryocytes, DIAPH1 siRNA, ROCK inhibitor, confocal imaging of proplatelet formation, cytoskeletal markers","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus pharmacological and siRNA approaches with multiple cytoskeletal readouts, replicated in related studies","pmids":["25298036"],"is_preprint":false},{"year":2015,"finding":"mDia1 initiates lamellipodia and ruffles by nucleating linear actin filaments that serve as seeds for Arp2/3 complex-dependent branched network formation; mDia1 is an EGF-regulated actin nucleator that localizes within nascent and mature membrane ruffles and cooperates sequentially with Arp2/3.","method":"mDia1 knockdown and rescue experiments, optogenetics, Arp2/3 pharmacological inhibition (CK-666), fluorescence imaging of ruffles and lamellipodia, migration assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods including optogenetics and pharmacological dissection with functional rescue","pmids":["26349808"],"is_preprint":false},{"year":2016,"finding":"A gain-of-function DIAPH1 R1213* variant truncates the DAD domain, disrupts DID-DAD autoinhibitory interaction, and causes constitutive DIAPH1 activation, leading to increased filamentous actin, stable microtubules in platelets and megakaryocytes, reduced proplatelet formation, macrothrombocytopenia, and sensorineural hearing loss.","method":"Patient-derived cell studies, DIAPH1 R1213* overexpression in cells, immunofluorescence of F-actin and microtubules, flow cytometry, in vitro megakaryocyte culture","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient variant combined with cellular overexpression showing consistent cytoskeletal phenotypes, multiple assays, replicated in related studies","pmids":["26912466"],"is_preprint":false},{"year":2016,"finding":"An mDia1-INF2 formin activation cascade, scaffolded by IQGAP1, regulates stable detyrosinated microtubule formation downstream of LPA/RhoA; mDia1 promotes INF2 localization to microtubules, and the N-terminus of IQGAP1 directly binds the C-terminus of INF2 to facilitate a tripartite complex.","method":"siRNA knockdown of mDia1, INF2, and IQGAP1; constitutively active formin mutants; direct binding assay (IQGAP1-INF2); immunofluorescence of Glu-MTs; LPA stimulation","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis through sequential knockdowns plus direct binding assay, single lab","pmids":["27030671"],"is_preprint":false},{"year":2016,"finding":"DIAPH1 c.3634+1G>T and c.3610C>T mutations cause C-terminal truncation of DIA1 that disrupts the autoinhibitory DID-DAD interaction (specifically a basic RRKR motif in the DAD), constitutively activating DIA1; this causes increased rates of directional actin polymerization, elongated microvilli, progressive hair cell loss, and DFNA1 hearing loss in mice.","method":"Patient-derived mutation analysis, in vitro DID-DAD binding assay, single-molecule actin polymerization imaging, FLAG-DIA1(R1204X) knock-in mouse, auditory brainstem response, hair cell morphology","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro biochemical reconstitution of autoinhibition disruption combined with in vivo mouse model and single-molecule imaging","pmids":["27707755"],"is_preprint":false},{"year":2016,"finding":"Small molecule screening identified 13 competitive inhibitors of the ctRAGE-DIAPH1 interaction; these compounds inhibit RAGE-dependent molecular processes in vitro and in vivo, confirming that the ctRAGE-DIAPH1 protein-protein interaction is pharmacologically tractable and functionally important for RAGE signaling.","method":"Small molecule screen (58,000 compounds), competitive binding assay for ctRAGE-DIAPH1 interaction, in vitro and in vivo RAGE signaling assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical competitive inhibition assay plus cellular and in vivo functional validation, single lab","pmids":["26936329"],"is_preprint":false},{"year":2018,"finding":"Helical rotation of mDia1 during processive actin elongation converts F-actin into a cofilin-resistant state both in vitro and in vivo; tethering mDia1 and the pointed end simultaneously causes untwisting of the F-actin long-pitch helix, which inhibits cofilin binding and severing; constitutively active mDia1ΔC63 in cells produces long-lived, cofilin-dissociating F-actin.","method":"Electron micrography of actin helix twist, in vitro cofilin binding and severing assay with tethered vs. free mDia1, single-molecule imaging of mDia1ΔC63 in cells, F-actin lifetime measurement","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biophysical reconstitution with EM structural analysis plus in-cell single-molecule validation","pmids":["29760064"],"is_preprint":false},{"year":2018,"finding":"Cdk1 phosphorylates DIAPH1 during mitosis to prevent profilin1 binding, thereby maintaining cortical tension at a constant level in metaphase; loss of DIAPH1 phosphorylation causes excess cortical F-actin accumulation, increased cortical tension, and delayed anaphase onset due to spindle assembly checkpoint (SAC) activation.","method":"Cdk1 kinase assay, phospho-site mutant DIAPH1 expression, cortical tension measurement (AFM/osmotic assay), SAC reporter, profilin1 binding assay, intra-kinetochore stretch measurement","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay plus phospho-mutant cellular phenotype and biophysical tension measurement in a single rigorous study","pmids":["30816115"],"is_preprint":false},{"year":2018,"finding":"Diaph1 (mDia1) promotes myofibroblastic activation of hepatic stellate cells by binding to both TGFβ receptor II (TβRII) and Rab5a via its N-terminal domain; Diaph1 stimulates Rab5a GTPase activity, increases TβRII endocytosis, and is required for SMAD3 phosphorylation and TGFβ1-induced fibrogenic gene expression.","method":"shRNA knockdown of Diaph1, SMIFH2 formin inhibitor, co-immunoprecipitation of Diaph1-TβRII and Diaph1-Rab5a, Rab5a activity assay, TβRII internalization assay, SMAD3 phosphorylation, tumor implantation mouse model","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding assays combined with functional knockdown, Rab5a activity measurement, and in vivo mouse model","pmids":["32304339"],"is_preprint":false},{"year":2018,"finding":"mDia1 and mDia3 together generate a dynamic cortical F-actin meshwork in Sertoli cells that is continuous with contractile actomyosin bundles; double KO of mDia1/3 impairs this architecture, induces ectopic espin1-containing bundles, disrupts Sertoli-germ cell interactions, and causes spermatogenic failure, establishing mDia1/3 as essential for male fertility.","method":"mDia1 and mDia3 double-knockout mice, superresolution microscopy, single-molecule imaging of actin dynamics, immunofluorescence, spermatogenesis histology","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double-KO with superresolution and single-molecule imaging providing mechanistic insight into F-actin architecture in vivo","pmids":["30256801"],"is_preprint":false},{"year":2019,"finding":"mDia1 activity is required for DIAPH1-mediated regulation of SRF-target genes, sarcoplasmic reticulum Ca2+ ATPase expression, and sodium-calcium exchanger expression in cardiomyocytes; Diaph1 knockout reduces infarct size and improves contractile function after ischemia-reperfusion in mice.","method":"Diaph1-/- mouse I/R model, siRNA knockdown in H9C2 cells, actin polymerization assay, SRF-reporter, SERCA and NCX western blot","journal":"EBioMedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO in vivo combined with siRNA and mechanistic readouts in vitro, single lab","pmids":["29239839"],"is_preprint":false},{"year":2020,"finding":"SPIN90 forms a ternary complex with Arp2/3 and mDia1 in vitro; this complex greatly enhances actin filament nucleation, producing unbranched filaments with mDia1 at barbed ends and SPIN90-Arp2/3 at pointed ends; SPIN90 efficiently recruits mDia1 to SPIN90-Arp2/3-nucleated filaments, lowering branching density and increasing long mDia1-elongated filaments in the cortex.","method":"In vitro actin assembly reconstitution, TIRF microscopy of single filaments, biochemical pulldown of ternary complex, cell cortex imaging","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with single-molecule TIRF and biochemical complex formation, single lab","pmids":["32572169"],"is_preprint":false},{"year":2020,"finding":"Formin-mediated actin polymerization (specifically by mDia1 and mDia3 at the immune synapse) is required for spatiotemporal control of Zap70-LAT phosphorylation during T cell receptor activation; formin inhibition blocks LAT phosphorylation without affecting Zap70 activation; mDia1/mDia3 localize to the IS upon TCR stimulation and their genetic absence impairs this pathway.","method":"mDia1 and mDia3 knockout mice, formin inhibitor (SMIFH2), LAT and Zap70 phosphorylation assay, high-resolution immunofluorescence and 3D reconstruction of IS","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO combined with pharmacological inhibition, multiple imaging and biochemical readouts, formin isoform specificity established","pmids":["31911947"],"is_preprint":false},{"year":2021,"finding":"mDia1-mediated actin polymerization at focal adhesions is activated by contractile force in a pulsatile manner; suppression of mDia1 actin polymerization increases tension on stress fibers and elevates spontaneous stress fiber damage, while reducing efficiency of zyxin-mediated stress fiber repair, establishing force-dependent mDia1 activity as a safety valve against mechanical cytoskeletal damage.","method":"Live-cell imaging of mDia1 activity (mDia1-FRET biosensor or GFP-mDia1), mathematical modeling, laser ablation of stress fibers, zyxin-mCherry repair assay, traction force microscopy","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — live-cell quantitative imaging with biosensor, mathematical modeling, and direct mechanical perturbation experiments in a single study","pmids":["34822787"],"is_preprint":false},{"year":2021,"finding":"RAGE229, a small-molecule antagonist of ctRAGE-DIAPH1 interaction, binds ctRAGE (defined by solution NMR), suppresses RAGE-DIAPH1 binding and FRET, and attenuates diabetic complications in mice including reduced mesangial sclerosis, inflammation, and kidney dysfunction, without lowering blood glucose.","method":"NMR spectroscopy, FRET assay of ctRAGE-DIAPH1 binding, in vivo streptozotocin diabetes mouse model, kidney histopathology, plasma cytokine measurement","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure-guided interaction inhibition combined with rigorous in vivo efficacy testing, single lab","pmids":["34818060"],"is_preprint":false},{"year":2023,"finding":"DIAPH1 mediates SREBP1 nuclear translocation (independently of carbohydrate/insulin cues) through the actin cytoskeleton, promoting hepatic lipid synthesis genes (Acaca, Acacb, Gpat2, Fasn); Diaph1 deletion reduces atherosclerosis and plasma cholesterol/triglycerides in Ldlr-/- mice on Western diet.","method":"Ldlr-/- × Diaph1-/- mouse atherosclerosis model, hepatic gene expression (qPCR), SREBP1 nuclear translocation immunofluorescence, plasma lipid measurement, actin cytoskeleton manipulation","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO in vivo with mechanistic SREBP1 nuclear localization assay, single lab","pmids":["36932214"],"is_preprint":false}],"current_model":"DIAPH1 (mDia1) is an autoinhibited Rho-family GTPase effector whose DID-DAD intramolecular interaction is disrupted by GTP-RhoA binding, releasing the FH1-FH2 module to processively nucleate and elongate unbranched actin filaments via helical rotation; it coordinates the actin and microtubule cytoskeletons, acts as the essential cytoplasmic effector of RAGE signaling, is phosphorylated by Cdk1 to control mitotic cortical tension and spindle assembly checkpoint inactivation, and is required for diverse cellular processes including stress fiber and focal adhesion formation, T cell and immune cell trafficking, megakaryocyte proplatelet formation, T cell receptor signaling (spatiotemporal LAT phosphorylation), vascular remodeling, and steroidogenic mitochondrial trafficking."},"narrative":{"mechanistic_narrative":"DIAPH1 (mDia1) is an autoinhibited Rho-family GTPase effector that nucleates and processively elongates unbranched actin filaments, coordinating the actin and microtubule cytoskeletons to drive cell migration, polarity, division, and immune and vascular signaling [PMID:10559899, PMID:11146620, PMID:14657240]. In the resting state, an intramolecular DID-DAD interaction holds the protein inactive; GTP-RhoA binds the regulatory N-terminal domain at a site that overlaps the DAD-binding surface, displacing the DAD and releasing the FH1-FH2 module, as defined by crystal and NMR structures of the dimeric N-terminal armadillo-repeat domain and of an N-terminal/FH2-DAD assembly [PMID:15866170, PMID:20927338]. The released FH2 domain dimerizes to nucleate actin, protects barbed ends from capping protein, and elongates filaments processively while undergoing helical rotation around the filament; the FH1 domain recruits profilin-actin and this rotation renders filaments resistant to cofilin severing [PMID:12906795, PMID:14657240, PMID:21148346, PMID:29760064]. mDia1 nucleation frequency is tuned directly by free G-actin concentration, and its activity is further modulated by cofactors including Flightless-I, APC, and SPIN90-Arp2/3, the latter coupling linear mDia1 elongation to branched network formation [PMID:18827014, PMID:20223827, PMID:20566685, PMID:32572169]. Through these activities mDia1 builds stress fibers downstream of RhoA in balance with ROCK, drives force-induced focal adhesion maturation and mechanosensitive stress-fiber repair, activates serum response factor by depleting the G-actin pool, and aligns microtubules with actin to control cell polarity, MTOC orientation, and focal-adhesion turnover [PMID:10559899, PMID:11402062, PMID:12429848, PMID:16943426, PMID:34822787]. It directly binds and engages microtubules through the FH2 domain and acts in formin cascades with INF2 (scaffolded by IQGAP1) and with capping protein to generate stable detyrosinated microtubules [PMID:21998204, PMID:22918941, PMID:27030671]. mDia1 also serves as the essential membrane-proximal cytoplasmic effector of RAGE, binding the RAGE cytoplasmic tail to transduce ligand-stimulated AKT signaling, a protein-protein interaction that is pharmacologically tractable and whose inhibition attenuates diabetic complications and vascular neointimal expansion [PMID:22194616, PMID:22511750, PMID:26936329, PMID:34818060]. In vivo it is required for T lymphocyte trafficking, NK and macrophage cytoskeletal organization, TCR-driven spatiotemporal LAT phosphorylation, hematopoietic progenitor homeostasis, megakaryocyte proplatelet formation, and male fertility, and is phosphorylated by Cdk1 to restrain profilin binding and cortical tension during metaphase, preventing inappropriate spindle assembly checkpoint activation [PMID:17682067, PMID:17699759, PMID:19427913, PMID:19234535, PMID:25298036, PMID:30816115, PMID:30256801, PMID:31911947]. Gain-of-function truncations that delete the DAD constitutively activate DIAPH1, causing increased F-actin and stabilized microtubules, macrothrombocytopenia, and DFNA1 sensorineural hearing loss [PMID:26912466, PMID:27707755].","teleology":[{"year":1999,"claim":"Established mDia1 as a RhoA effector for actin organization, answering how active RhoA produces distinct actin architectures.","evidence":"Constitutively active and dominant-negative mDia1 constructs with actin imaging, showing mDia1 and ROCK act concurrently downstream of Rho","pmids":["10559899"],"confidence":"High","gaps":["Mechanism of autoinhibition release not yet structurally defined","Biochemical actin activity not yet reconstituted"]},{"year":2001,"claim":"Defined mDia1 as a mechanosensing effector and a coordinator of actin and microtubules, separating its functions from ROCK/myosin contractility.","evidence":"Force application with live imaging of focal contacts plus FH2 point mutagenesis dissociating microtubule alignment from actin accumulation; spindle localization mapped to an FH3 segment","pmids":["11402062","11146620","11171383"],"confidence":"High","gaps":["Molecular basis of FH2-microtubule coordination unresolved","Spindle function of mDia1 not yet established"]},{"year":2002,"claim":"Connected mDia1 actin assembly to transcription and to Rac crosstalk, answering how a formin influences gene expression and adjacent GTPase activity.","evidence":"SRF reporter with non-polymerizable actin mutant placing actin assembly upstream of SRF; epistasis with Cas/Src/Crk/DOCK180 for Rho-dependent Rac activation","pmids":["12429848","12021256"],"confidence":"High","gaps":["Direct link between mDia1 and the Rac-activation machinery not biochemically defined","In vivo relevance of SRF activation unaddressed"]},{"year":2003,"claim":"Reconstituted mDia1 as a processive barbed-end actin nucleator/elongator and showed autoinhibition biochemically, answering its core enzymatic mechanism.","evidence":"Pyrene-actin assays with purified FH1-FH2 and N-terminal constructs, barbed-end capping protection, yeast complementation, plus genetic KO showing Drf3 compensation","pmids":["12906795","14657240","12676083"],"confidence":"High","gaps":["Atomic structure of the autoinhibited state not yet solved","GDP- vs GTP-RhoA effect on relief incompletely resolved"]},{"year":2005,"claim":"Provided the structural basis for RhoA-mediated activation, answering how GTP-RhoA competes with the DAD to relieve autoinhibition.","evidence":"Crystal structure of the dimeric N-terminal DID domain with NMR/biochemical mapping of overlapping RhoA and DAD sites","pmids":["15866170"],"confidence":"High","gaps":["Conformational dynamics of full-length activation not captured","FH2 release upon DAD displacement not directly visualized"]},{"year":2006,"claim":"Showed autoinhibition controls both actin activity and membrane localization, framing dual regulation as a general DRF principle.","evidence":"In vitro actin assays plus localization of GTPase-binding-deficient GFP-mDia1 variants","pmids":["16943183"],"confidence":"Medium","gaps":["Single-lab study without reconstitution of the localization determinant","Membrane receptor mediating localization not identified here"]},{"year":2007,"claim":"Established in vivo requirements for mDia1 in immune trafficking and hematopoiesis, and placed it downstream of a Galpha12/13-LARG-RhoA axis for MTOC polarization.","evidence":"mDia1 knockout mice with lymphocyte trafficking, chemotaxis, and hematopoietic phenotyping; Galpha12/13-deficient MEFs with LARG-pericentrin co-IP and MTOC assays","pmids":["17682067","17699759","17959834"],"confidence":"High","gaps":["Cell-intrinsic vs systemic contributions to myeloproliferation not fully separated","Mechanism linking mDia1 to MTOC orientation incompletely defined"]},{"year":2008,"claim":"Defined G-actin concentration as a direct regulator of mDia1 nucleation and identified Memo as upstream of membrane-localized RhoA-mDia1.","evidence":"Single-molecule imaging with latrunculin and modeling; Memo siRNA with RhoA/mDia1 localization imaging in breast carcinoma cells","pmids":["18827014","18955552"],"confidence":"High","gaps":["Physiological range of G-actin tuning in vivo not established","Direct vs indirect Memo-RhoA mechanism not biochemically defined"]},{"year":2010,"claim":"Resolved the helical-rotation elongation mechanism and the autoinhibited tetrameric structure, and identified cooperative cofactors (APC, Fli-I) and a Src-trafficking/oncogenic role.","evidence":"Single-molecule fluorescence polarization of elongation; crystal structure of N+C tetramer; in vitro reconstitution with APC-B and Flightless-I; mDia1-KO MEFs with v-Src trafficking and tumor assays; steroidogenic and Golgi imaging","pmids":["21148346","20927338","20566685","20223827","20679479","20591975","21680709"],"confidence":"High","gaps":["How rotation couples to physiological filament functions left open","In vivo contribution of APC/Fli-I cofactors unaddressed","Src-transport mechanism along actin not molecularly resolved"]},{"year":2011,"claim":"Established mDia1 as the essential intracellular effector of RAGE and mapped its microtubule-binding and filopodial partnerships, broadening its receptor and cytoskeletal interactomes.","evidence":"NMR structure of ctRAGE-mDia1 interface with AKT/migration assays; in vitro microtubule co-sedimentation; FRET/RNAi defining CLIP-170, IRSp53, and Rif partnerships","pmids":["22194616","21998204","19114595","22179776","21339294"],"confidence":"High","gaps":["Downstream signaling chain from ctRAGE-mDia1 to AKT incompletely defined","Stoichiometry of simultaneous actin and microtubule engagement in cells unclear"]},{"year":2012,"claim":"Linked mDia1 to stable microtubule formation via capping-protein hand-off and to membrane-domain trafficking, plus an in vivo vascular RAGE pathway.","evidence":"RNAi/pharmacology showing capping protein releases mDia1 to act on MTs; Cav1/caveolae trafficking downstream of Abl; mDia1-KO femoral artery injury with c-Src/Rac1/AKT pathway dissection","pmids":["22918941","22454521","22511750"],"confidence":"High","gaps":["Direct mDia1-microtubule stabilization step not isolated from actin effects","Caveolae regulation mechanism single-lab"]},{"year":2016,"claim":"Identified DIAPH1 gain-of-function disease alleles and an mDia1-INF2 formin cascade, and validated the ctRAGE-DIAPH1 interaction as druggable.","evidence":"Patient R1213*/C-terminal truncation studies with knock-in mice (macrothrombocytopenia, DFNA1 hearing loss); siRNA epistasis defining IQGAP1-scaffolded mDia1-INF2; small-molecule competitive inhibitor screen","pmids":["26912466","27707755","27030671","26936329"],"confidence":"High","gaps":["Tissue-specific consequences of constitutive activation incompletely mapped","In vivo selectivity of early ctRAGE-DIAPH1 inhibitors not established"]},{"year":2018,"claim":"Defined cofilin-resistance via helical rotation, Cdk1 control of mitotic cortical tension, a TGFbeta-receptor endocytic role, and essential function in spermatogenesis.","evidence":"EM/cofilin assays with tethered mDia1; Cdk1 phospho-mutant DIAPH1 with cortical tension and SAC measurements; Diaph1-TbetaRII/Rab5a co-IP with internalization assays; mDia1/3 double-KO superresolution in Sertoli cells","pmids":["29760064","30816115","32304339","30256801"],"confidence":"High","gaps":["Kinase-substrate spatial regulation of Cdk1-DIAPH1 in cells not fully resolved","Direct vs scaffold role in TbetaRII endocytosis incompletely separated"]},{"year":2020,"claim":"Established mDia1/mDia3 control of TCR-driven LAT phosphorylation and an mDia1-SPIN90-Arp2/3 ternary complex coupling linear and branched actin networks.","evidence":"mDia1/mDia3 KO mice plus SMIFH2 with LAT/Zap70 phospho and IS imaging; in vitro reconstitution and TIRF of the SPIN90-Arp2/3-mDia1 complex","pmids":["31911947","32572169"],"confidence":"High","gaps":["How formin-built filaments spatially gate LAT phosphorylation unresolved","In vivo prevalence of SPIN90-mDia1 cortical filaments not quantified"]},{"year":2021,"claim":"Defined force-activated pulsatile mDia1 activity as a stress-fiber safety valve and advanced a structure-guided RAGE-DIAPH1 antagonist for diabetic complications.","evidence":"mDia1 biosensor imaging with laser ablation, traction force microscopy, and modeling; NMR-defined RAGE229 with in vivo streptozotocin diabetic kidney efficacy","pmids":["34822787","34818060"],"confidence":"High","gaps":["Force-sensing molecular trigger of mDia1 activation not identified","Long-term and tissue-broad efficacy/safety of RAGE229 untested here"]},{"year":2023,"claim":"Extended DIAPH1 function to metabolic regulation via actin-dependent SREBP1 nuclear translocation and lipid synthesis.","evidence":"Ldlr-/- x Diaph1-/- atherosclerosis model with hepatic lipogenic gene expression and SREBP1 nuclear localization imaging","pmids":["36932214"],"confidence":"Medium","gaps":["Mechanism linking actin dynamics to SREBP1 transport unresolved","Single-lab in vivo correlation between actin state and SREBP1 translocation"]},{"year":null,"claim":"How the diverse upstream activators (RhoA, Rif, RAGE, Memo, force) are integrated to direct mDia1 to specific subcellular sites and substrate cytoskeletons remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of mDia1 spatial targeting across stimuli","Quantitative rules governing actin vs microtubule engagement in vivo unknown","Selective therapeutic modulation of individual mDia1 functions untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[7,8,24,42]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[8,24,28,32]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,27,34]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[22,23,44,47]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[20,39,44]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,2,28]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[12,18,27,37]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[3,10,24]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[26]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,27,34]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,24,43]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[14,19,20,48]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,46,51]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[26,33,44]}],"complexes":["ctRAGE-DIAPH1 complex","SPIN90-Arp2/3-mDia1 ternary complex","mDia1-INF2-IQGAP1 complex","Hck-WASp-mDia1 complex"],"partners":["RHOA","RAGE","INF2","IQGAP1","PKD2","CLIP-170","IRSP53","SPIN90"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60610","full_name":"Protein diaphanous homolog 1","aliases":["Diaphanous-related formin-1","DRF1"],"length_aa":1272,"mass_kda":141.3,"function":"Actin nucleation and elongation factor required for the assembly of F-actin structures, such as actin cables and stress fibers (By similarity). Binds to the barbed end of the actin filament and slows down actin polymerization and depolymerization (By similarity). Required for cytokinesis, and transcriptional activation of the serum response factor (By similarity). DFR proteins couple Rho and Src tyrosine kinase during signaling and the regulation of actin dynamics (By similarity). Functions as a scaffold protein for MAPRE1 and APC to stabilize microtubules and promote cell migration (By similarity). Has neurite outgrowth promoting activity. Acts in a Rho-dependent manner to recruit PFY1 to the membrane (By similarity). In hear cells, it may play a role in the regulation of actin polymerization in hair cells (PubMed:20937854, PubMed:21834987, PubMed:26912466). The MEMO1-RHOA-DIAPH1 signaling pathway plays an important role in ERBB2-dependent stabilization of microtubules at the cell cortex (PubMed:20937854, PubMed:21834987). It controls the localization of APC and CLASP2 to the cell membrane, via the regulation of GSK3B activity (PubMed:20937854, PubMed:21834987). In turn, membrane-bound APC allows the localization of the MACF1 to the cell membrane, which is required for microtubule capture and stabilization (PubMed:20937854, PubMed:21834987). Plays a role in the regulation of cell morphology and cytoskeletal organization. Required in the control of cell shape (PubMed:20937854, PubMed:21834987). Plays a role in brain development (PubMed:24781755). Also acts as an actin nucleation and elongation factor in the nucleus by promoting nuclear actin polymerization inside the nucleus to drive serum-dependent SRF-MRTFA activity (By similarity)","subcellular_location":"Cell membrane; Cell projection, ruffle membrane; Cytoplasm, cytoskeleton; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, spindle; Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/O60610/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DIAPH1","classification":"Not Classified","n_dependent_lines":47,"n_total_lines":1208,"dependency_fraction":0.03890728476821192},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000131504","cell_line_id":"CID000615","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":1}],"interactors":[{"gene":"CDC16","stoichiometry":0.2},{"gene":"SOWAHC","stoichiometry":0.2},{"gene":"FOXO1","stoichiometry":0.2},{"gene":"DNAJB12","stoichiometry":0.2},{"gene":"CSPG5","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000615","total_profiled":1310},"omim":[{"mim_id":"618867","title":"RAS HOMOLOG GENE FAMILY, MEMBER F, FILOPODIA-ASSOCIATED; RHOF","url":"https://www.omim.org/entry/618867"},{"mim_id":"617287","title":"PHOSPHOLIPID PHOSPHATASE-RELATED PROTEIN 5; PLPPR5","url":"https://www.omim.org/entry/617287"},{"mim_id":"616632","title":"SEIZURES, CORTICAL BLINDNESS, AND MICROCEPHALY SYNDROME; SCBMS","url":"https://www.omim.org/entry/616632"},{"mim_id":"614567","title":"DIAPHANOUS-RELATED FORMIN 3; DIAPH3","url":"https://www.omim.org/entry/614567"},{"mim_id":"610982","title":"INVERTED FORMIN 2; INF2","url":"https://www.omim.org/entry/610982"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Plasma membrane","reliability":"Uncertain"},{"location":"Cytosol","reliability":"Uncertain"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DIAPH1"},"hgnc":{"alias_symbol":["hDIA1","LFHL1","mDia1"],"prev_symbol":["DFNA1"]},"alphafold":{"accession":"O60610","domains":[{"cath_id":"1.25.10.10","chopping":"239-380","consensus_level":"medium","plddt":90.6769,"start":239,"end":380},{"cath_id":"1.20.58.630","chopping":"855-931","consensus_level":"high","plddt":89.6629,"start":855,"end":931},{"cath_id":"1.20.58.2220","chopping":"949-1159","consensus_level":"high","plddt":92.1057,"start":949,"end":1159}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60610","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60610-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60610-F1-predicted_aligned_error_v6.png","plddt_mean":72.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DIAPH1","jax_strain_url":"https://www.jax.org/strain/search?query=DIAPH1"},"sequence":{"accession":"O60610","fasta_url":"https://rest.uniprot.org/uniprotkb/O60610.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60610/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60610"}},"corpus_meta":[{"pmid":"11402062","id":"PMC_11402062","title":"Focal 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Biology","url":"https://pubmed.ncbi.nlm.nih.gov/32304339","citation_count":18,"is_preprint":false},{"pmid":"19234535","id":"PMC_19234535","title":"Src kinase Hck association with the WASp and mDia1 cytoskeletal regulators promotes chemoattractant-induced Hck membrane targeting and activation in neutrophils.","date":"2009","source":"Biochemistry and cell biology = Biochimie et biologie cellulaire","url":"https://pubmed.ncbi.nlm.nih.gov/19234535","citation_count":18,"is_preprint":false},{"pmid":"32248974","id":"PMC_32248974","title":"CREB1-induced lncRNA LEF1-AS1 contributes to colorectal cancer progression via the miR-489/DIAPH1 axis.","date":"2020","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/32248974","citation_count":18,"is_preprint":false},{"pmid":"32087478","id":"PMC_32087478","title":"A novel variant in diaphanous homolog 1 (DIAPH1) as the cause of auditory neuropathy in a Chinese family.","date":"2020","source":"International journal of pediatric otorhinolaryngology","url":"https://pubmed.ncbi.nlm.nih.gov/32087478","citation_count":18,"is_preprint":false},{"pmid":"19768111","id":"PMC_19768111","title":"Loss of RhoB expression enhances the myelodysplastic phenotype of mammalian diaphanous-related Formin mDia1 knockout mice.","date":"2009","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/19768111","citation_count":18,"is_preprint":false},{"pmid":"34449932","id":"PMC_34449932","title":"The cross-talk between RAGE and DIAPH1 in neurological complications of diabetes: A review.","date":"2021","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/34449932","citation_count":17,"is_preprint":false},{"pmid":"36503156","id":"PMC_36503156","title":"Formin protein DIAPH1 positively regulates PD-L1 expression and predicts the therapeutic response to anti-PD-1/PD-L1 immunotherapy.","date":"2022","source":"Clinical immunology (Orlando, Fla.)","url":"https://pubmed.ncbi.nlm.nih.gov/36503156","citation_count":17,"is_preprint":false},{"pmid":"26124177","id":"PMC_26124177","title":"Drosophila homologue of Diaphanous 1 (DIAPH1) controls the metastatic potential of colon cancer cells by regulating microtubule-dependent adhesion.","date":"2015","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/26124177","citation_count":17,"is_preprint":false},{"pmid":"33817200","id":"PMC_33817200","title":"RHOA and mDia1 Promotes Apoptosis of Breast Cancer Cells Via a High Dose of Doxorubicin Treatment.","date":"2019","source":"Open life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33817200","citation_count":17,"is_preprint":false},{"pmid":"30816115","id":"PMC_30816115","title":"Cdk1-mediated DIAPH1 phosphorylation maintains metaphase cortical tension and inactivates the spindle assembly checkpoint at anaphase.","date":"2019","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/30816115","citation_count":16,"is_preprint":false},{"pmid":"26674774","id":"PMC_26674774","title":"Coxiella burnetii Phagocytosis Is Regulated by GTPases of the Rho Family and the RhoA Effectors mDia1 and ROCK.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26674774","citation_count":16,"is_preprint":false},{"pmid":"28003573","id":"PMC_28003573","title":"A novel missense variant in the DIAPH1 gene in a Korean family with autosomal dominant nonsyndromic hearing loss.","date":"2016","source":"Genes & genetic systems","url":"https://pubmed.ncbi.nlm.nih.gov/28003573","citation_count":15,"is_preprint":false},{"pmid":"19470376","id":"PMC_19470376","title":"RhoA effector mDia1 is required for PI 3-kinase-dependent actin remodeling and spreading by thrombin in platelets.","date":"2009","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/19470376","citation_count":15,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50193,"output_tokens":13086,"usd":0.173434,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":24488,"output_tokens":6186,"usd":0.138545,"stage2_stop_reason":"end_turn"},"total_usd":0.311979,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"GTP-bound RhoA activates mDia1 by disrupting mDia1's intramolecular autoinhibitory interactions; active mDia1 induces formation of thin actin stress fibers, and mDia1 and ROCK work concurrently downstream of Rho to produce stress fibers of varying thickness and density depending on the balance of the two activities.\",\n      \"method\": \"Constitutively active mDia1 expression, dominant-negative constructs, in vitro binding studies, fluorescence microscopy of actin structures\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal biochemical and cell biological methods in a foundational paper, independently replicated across multiple subsequent studies\",\n      \"pmids\": [\"10559899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Constitutively active mDia1 (DeltaN3) is sufficient to restore force-induced focal contact formation in Rho-inhibited cells, demonstrating that mDia1 acts downstream of Rho to mediate mechanosensing-dependent focal contact growth independently of ROCK and myosin II contractility.\",\n      \"method\": \"Micropipette force application, GFP-vinculin/paxillin live imaging, expression of constitutively active mDia1 mutants, C3 transferase Rho inhibition, ROCK and myosin II pharmacological inhibition\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (live imaging, pharmacological inhibition, dominant-active mutant rescue) in a single rigorous study\",\n      \"pmids\": [\"11402062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Active mDia1 (DeltaN3 mutant containing FH1 and FH2 regions) induces bipolar cell elongation and aligns microtubules parallel to F-actin bundles along the long cell axis; point mutations in the FH2 region abolish microtubule alignment but not actin accumulation, revealing that the FH2 domain coordinates microtubules and F-actin.\",\n      \"method\": \"Expression of constitutively active mDia1 mutants, co-expression of dominant-negative FH2 fragment, point mutagenesis, immunofluorescence of microtubules and F-actin in HeLa cells\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain mutagenesis combined with cellular phenotypic rescue, replicated in subsequent studies\",\n      \"pmids\": [\"11146620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"mDia1 localizes to the mitotic spindle in HeLa cells from prophase to telophase, independently of Rho activity; a 173-amino acid segment in the FH3 region (including Leu434 and Leu455) is necessary and sufficient for spindle localization.\",\n      \"method\": \"Immunocytochemistry with polyclonal anti-mDia1 antibody, mitotic spindle fractionation/western blot, GFP-fusion truncation mutants, point mutagenesis, C3 exoenzyme and Val14RhoA microinjection\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (biochemical fractionation, live GFP imaging, mutagenesis) in a single study\",\n      \"pmids\": [\"11171383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"mDia1 FH1 domain binds profilin in vitro and in cells; the RBD (Rho-binding domain) complexes with the C-terminal CIID module for autoinhibition; overexpression of the RBD alone causes membrane ruffling and loss of stress fibers, which is suppressed by dominant-negative Rac, indicating that the isolated RBD upregulates Rac activity.\",\n      \"method\": \"In vitro binding assays, transfection of deletion constructs, dominant-negative Rac co-expression, morphological phenotyping\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — multiple complementary approaches in a single lab, no independent replication reported in this abstract\",\n      \"pmids\": [\"11707518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"mDia1 mediates Rho-dependent Rac activation through a pathway involving Cas phosphorylation (via Src/Crk/DOCK180), and this mDia1 activity is antagonized by ROCK; expression of dominant-negative mDia1 inhibits membrane ruffle formation induced by ROCK inhibition (Y-27632).\",\n      \"method\": \"C3 exoenzyme and Y-27632 pharmacological inhibition, dominant-negative mDia1 expression, N17Rac expression, GTP-Rac pull-down assay, PP1 Src inhibitor, dominant-negative Cas and Crk-II mutants\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established by multiple genetic/pharmacological interventions in a single rigorous study\",\n      \"pmids\": [\"12021256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"mDia1 activates serum response factor (SRF) by promoting F-actin assembly and depleting the G-actin pool; the FH2 domain (extended C-terminal region) is required for both actin polymerization and SRF activation, placing actin assembly upstream of SRF; the FH1 domain is dispensable for these functions.\",\n      \"method\": \"SRF luciferase reporter assay, actin polymerization assays, non-polymerizable actin mutant (R62D), mDia1 domain deletion constructs\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay combined with actin mutagenesis and domain deletion analysis establishing pathway order\",\n      \"pmids\": [\"12429848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Purified mDia1 FH2-containing constructs are potent actin nucleators in vitro; the FH1 domain is required for nucleation when actin is profilin-bound; an N-terminal mDia1 construct strongly inhibits C-terminal actin nucleation, consistent with autoinhibition; RhoA partially relieves this inhibition regardless of whether it is GDP- or GTP-bound.\",\n      \"method\": \"In vitro pyrene-actin polymerization assay with purified proteins, size exclusion chromatography (multimer analysis), GST-RhoA binding\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro biochemical assay with purified proteins plus domain analysis; findings replicated by independent groups\",\n      \"pmids\": [\"12906795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Purified mDia1 FH2 domain dimerizes and protects growing actin filament barbed ends from capping protein, enabling processive elongation; this mechanism is conserved with yeast Bni1, and dominant-active mDia1 partially complements BNI1 function in yeast.\",\n      \"method\": \"In vitro actin assembly assays, barbed-end capping protection assay, yeast complementation genetics\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in vitro with multiple assays plus in vivo genetic complementation\",\n      \"pmids\": [\"14657240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Genetic disruption of Drf1 (mDia1) reveals compensatory upregulation of Drf3; Drf1-/- cells show fewer actin stress fibers but are more motile with more lamella and filopodia, attributable to Cdc42-mediated Drf3 activation; mDia1 loss-of-function establishes it as required for RhoA-mediated stress fiber formation in primary mouse cells.\",\n      \"method\": \"Homologous recombination gene targeting, Drf3 antibody microinjection, FRET analysis of Cdc42-Drf3 interaction, dominant-negative Drf3 variants\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO combined with FRET and rescue experiments in a single study\",\n      \"pmids\": [\"12676083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"mDia1 (Drf1) physically interacts with PKD2 via the cytoplasmic C-terminus of PKD2 and the mDia1 N-terminus; they co-localize at the mitotic spindle; mDia1 knockdown by RNAi causes loss of PKD2 from mitotic spindles and alters intracellular Ca2+ release.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation in native and transfected cells, RNAi knockdown, immunofluorescence, intracellular Ca2+ measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid identified interaction, confirmed by reciprocal co-IP plus RNAi functional consequence\",\n      \"pmids\": [\"15123714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structure of the dimeric mDia1 regulatory N-terminal domain reveals an intertwined six-helix bundle with two armadillo-repeat DIDs; NMR and biochemical mapping show that RhoA and DAD binding sites partially overlap on the DID, explaining how RhoA activates mDia1 by competing with DAD; RhoA binding also requires a flexibly tethered arm adjacent to the DID.\",\n      \"method\": \"X-ray crystallography, NMR spectroscopy, biochemical binding assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure at atomic resolution validated by NMR and biochemical assays in a single rigorous study\",\n      \"pmids\": [\"15866170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Autoinhibition of mDia1 regulates not only in vitro actin assembly activity but also a novel membrane-localization activity in vivo; Rho-family GTPase binding relieves autoinhibition of both activities simultaneously, establishing dual regulation of localization and biochemical function as a general DRF principle.\",\n      \"method\": \"In vitro actin assembly assays, cellular localization of GFP-tagged wild-type vs. constitutively active and autoinhibited mDia1, GTPase binding-deficient mutants\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vitro reconstitution combined with cellular localization imaging, single lab study\",\n      \"pmids\": [\"16943183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The Rho-mDia1 pathway regulates cell polarity and focal adhesion turnover during directed migration by aligning microtubules and actin filaments, enabling delivery of Apc/active Cdc42 to the cell front and c-Src to focal adhesions; mDia1 depletion by RNAi impairs both polarization and adhesion turnover.\",\n      \"method\": \"siRNA knockdown of mDia1 in rat C6 glioma cells, expression of active mDia1, live-cell imaging of Apc, Cdc42-FRET, c-Src localization by immunofluorescence\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi loss-of-function combined with active-mDia1 gain-of-function and multi-probe live imaging in a single study\",\n      \"pmids\": [\"16943426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"mDia1 is required for T lymphocyte chemotaxis and trafficking; mDia1-/- T cells show impaired actin filament formation, loss of polarity, reduced chemotaxis in vitro, and defective homing to secondary lymphoid organs in vivo despite normal integrin/chemokine receptor expression.\",\n      \"method\": \"mDia1 knockout mice, in vivo lymphocyte trafficking assay, in vitro chemotaxis, actin polymerization assay, flow cytometry\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple in vivo and in vitro phenotypic readouts, replicated in a second independent mDia1 KO study\",\n      \"pmids\": [\"17682067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Genetic disruption of Drf1 (mDia1) in mice causes age-dependent myeloproliferative defects including splenomegaly, hypercellular fibrotic bone marrow, and expansion of monocyte/macrophage and erythroid precursor populations, demonstrating an in vivo role for mDia1 in hematopoietic progenitor regulation.\",\n      \"method\": \"Homologous recombination knockout mouse, histopathology, flow cytometric cell surface marker analysis, bone marrow cell cycle analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO in vivo with multiple quantitative phenotypic readouts, replicated by related studies\",\n      \"pmids\": [\"17699759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Galpha12/13-activated LARG associates with pericentrin and localizes to the MTOC and microtubule tracks; this Galpha12/13-LARG axis signals through RhoA to activate mDia1, which is required for MTOC polarization and microtubule dynamics in migrating fibroblasts.\",\n      \"method\": \"Galpha12/13-deficient mouse embryonic fibroblasts, co-immunoprecipitation of LARG and pericentrin, dominant-negative/constitutively active mDia1 and Galpha constructs, MTOC orientation assay, microtubule dynamics imaging\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function plus biochemical interaction and functional rescue, single lab\",\n      \"pmids\": [\"17959834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"G-actin concentration directly regulates mDia1 actin nucleation frequency: elevated free G-actin (e.g., caused by low-dose latrunculin B) increases the actin nucleation rate of mDia1 via enhanced catalytic efficiency of the FH2 domain, independent of Rho signaling; this mechanism enables rapid actin polymer restoration at sites of actin disassembly.\",\n      \"method\": \"Single-molecule live-cell imaging of mDia1, unpolymerizable actin mutants, latrunculin B treatment, simulation analysis of G-actin concentration\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule imaging combined with mathematical modeling and pharmacological perturbation, single lab but rigorous quantitative approach\",\n      \"pmids\": [\"18827014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Memo is required for RhoA GTPase and its effector mDia1 to localize to the plasma membrane at the leading edge; loss of Memo impairs mDia1-dependent lamellipodial actin network organization, adhesion site formation, and microtubule outgrowth, placing Memo upstream of the RhoA-mDia1 axis in ErbB2-dependent cell migration.\",\n      \"method\": \"siRNA knockdown of Memo in breast carcinoma cells, immunofluorescence of RhoA/mDia1 localization, MT dynamics imaging, adhesion site quantification\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — RNAi loss-of-function with multiple imaging readouts, single lab study\",\n      \"pmids\": [\"18955552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Loss of hDia1 (mDia1) in NK cells impairs microtubule cytoskeleton organization and targeting of microtubules to the lytic synapse but does not disrupt actin assembly at the synapse or cell adhesion, revealing a specific role for hDia1 in microtubule capture at the cell periphery during NK-mediated cytotoxicity.\",\n      \"method\": \"siRNA knockdown of hDia1 in NK cells, target cell lysis assay, immunofluorescence of actin and microtubules at the lytic synapse\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — RNAi loss-of-function with phenotypic dissection; single lab, single method type\",\n      \"pmids\": [\"19427913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"mDia1 forms an inducible complex with the Src kinase Hck and WASp in chemoattractant-stimulated neutrophils; mDia1 is required for chemokine-induced Hck membrane translocation, Hck activation, and Hck-mediated WASp tyrosine phosphorylation, establishing mDia1 as a scaffold linking Rho/actin to tyrosine kinase signaling at the leading edge.\",\n      \"method\": \"Co-immunoprecipitation, mDia1-/- neutrophils, immunofluorescence of Hck localization, Hck kinase activity assay, WASp phosphorylation analysis\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO combined with co-IP and multiple biochemical readouts, single lab\",\n      \"pmids\": [\"19234535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"mDia1 targets v-Src (and by implication c-Src) from the perinuclear region to focal adhesions and the cell periphery via actin filament-dependent transport; in mDia1-deficient cells, v-Src fails to translocate to the membrane, leading to impaired tyrosine phosphorylation, suppressed podosome formation, reduced transformation, and decreased tumorigenesis/invasion in vivo.\",\n      \"method\": \"mDia1-knockout mouse embryonic fibroblasts, temperature-sensitive v-Src, immunofluorescence, focus formation, soft-agar colony formation, nude mouse tumor implantation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple in vitro and in vivo oncogenic phenotypic readouts in a single study\",\n      \"pmids\": [\"20679479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Flightless-I (Fli-I) directly binds mDia1 (and Daam1) and enhances their intrinsic actin assembly activity in vitro; Fli-I also promotes GTP-Rho-mediated relief of mDia1/Daam1 autoinhibition, identifying Fli-I as a positive cofactor for Rho-induced linear actin assembly.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation, in vitro pyrene-actin polymerization assay, cell-based actin assembly assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of actin assembly plus direct binding assays and cellular validation, single lab\",\n      \"pmids\": [\"20223827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Adenomatous polyposis coli (APC) C-terminal basic domain (APC-B) nucleates actin filaments and synergizes with mDia1; together, APC-B and mDia1 overcome the dual cellular barrier of profilin and capping protein to assemble actin, establishing APC as a mDia1 in vivo binding partner for cooperative actin nucleation.\",\n      \"method\": \"In vitro pyrene-actin nucleation assay with purified proteins, co-immunoprecipitation, EM of APC-B filaments, cell-based actin assembly assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified proteins plus cellular and biochemical interaction validation\",\n      \"pmids\": [\"20566685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"mDia1 localizes to the mitotic spindle, and single-molecule fluorescence polarization demonstrates that mDia1 undergoes helical rotation along the long-pitch axis of the actin filament during processive elongation; this rotation oscillates with F-actin helix periodicity and is unaffected by actin-bound nucleotide or profilin.\",\n      \"method\": \"Single-molecule fluorescence polarization imaging, in vitro actin elongation from immobilized mDia1\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-molecule biophysical measurement with rigorous controls; novel mechanistic finding in a high-profile journal\",\n      \"pmids\": [\"21148346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ACTH-stimulated cortisol biosynthesis requires RhoA and DIAPH1; ACTH/cAMP increases GTP-RhoA and promotes RhoA-DIAPH1 interaction; dominant-negative RhoA or DIAPH1 siRNA impairs mitochondrial trafficking (microtubule-dependent) and reduces cortisol biosynthesis while increasing androgen secretion, establishing a RhoA-DIAPH1 axis in steroidogenic organelle dynamics.\",\n      \"method\": \"Live-cell confocal video microscopy of mitochondria, RhoA activity assay, siRNA knockdown of DIAPH1, dominant-negative RhoA overexpression, steroid hormone measurement\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging plus knockdown and dominant-negative approaches with biochemical readouts, single lab\",\n      \"pmids\": [\"20591975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The Rho-mDia1 pathway drives Golgi complex fragmentation into ministacks; constitutively active mDia1 alone is sufficient for Golgi dispersion; active mDia1 promotes formation of Rab6-positive transport vesicles and transiently localizes to these vesicles, revealing a role for mDia1 in Golgi membrane remodeling.\",\n      \"method\": \"Constitutively active and dominant-negative mDia1 expression, RhoA activation by LPA, cytoskeletal inhibitors (latrunculin B, blebbistatin, taxol), live imaging of Golgi markers, Rab6 vesicle analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — constitutively active construct plus pharmacological dissection and live imaging, single lab\",\n      \"pmids\": [\"21680709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The cytoplasmic domain of RAGE (ctRAGE) directly binds mDia1, and this interaction—mediated by an unusual α-turn in ctRAGE—is required for RAGE ligand-stimulated AKT phosphorylation and cell proliferation/migration, establishing mDia1 as the essential membrane-proximal intracellular effector of RAGE signaling.\",\n      \"method\": \"NMR structure determination of ctRAGE, NMR mapping of ctRAGE-mDia1 interaction interface, mutagenesis of the α-turn, AKT phosphorylation and cell migration assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure plus mutagenesis and functional cell assays in a single study\",\n      \"pmids\": [\"22194616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"INF2, mDia1, and mDia2 FH1FH2C constructs all bind microtubules with high affinity (Kd < 100 nM); mDia1 shows saturating binding at ~1:3 stoichiometry (dimer:tubulin dimer) but does not bundle microtubules; microtubules moderately inhibit actin polymerization by mDia1; actin monomers do not affect mDia1 microtubule binding, demonstrating simultaneous actin and microtubule engagement.\",\n      \"method\": \"In vitro microtubule co-sedimentation assay, microtubule catastrophe rate measurement, actin polymerization assay with purified proteins\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative in vitro reconstitution with purified proteins and multiple complementary assays, single study\",\n      \"pmids\": [\"21998204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CLIP-170 directly interacts with the FH2 domain of mDia1 and controls mDia1 recruitment to the phagocytic cup during complement receptor (alphaMbeta2/CR3)-mediated phagocytosis in macrophages; CLIP-170 knockdown reduces mDia1 recruitment and actin polymerization at the phagocytic cup.\",\n      \"method\": \"RNAi knockdown, dominant-negative CLIP-170, direct binding assay (CLIP-170-FH2 interaction), live-cell imaging of phagocytosis, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay plus RNAi and live-cell imaging, single lab\",\n      \"pmids\": [\"19114595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"mDia1 and WAVE2 directly interact with IRSp53 within filopodia (shown by FRET); mDia1 and WAVE2 synergize with IRSp53 to form filopodia; knockdown of mDia1 or WAVE2 decreases IRSp53-induced filopodium formation, establishing mDia1 as a specific SH3-domain partner of IRSp53 in filopodium biogenesis.\",\n      \"method\": \"Acceptor photobleaching FRET, siRNA knockdown, time-lapse imaging, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET-based direct interaction plus RNAi, single lab\",\n      \"pmids\": [\"22179776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rif GTPase directly interacts with mDia1 (but not mDia2) within filopodia to drive filopodium formation independently of Cdc42 effectors (N-WASP, IRSp53) and Rac effectors (WAVE1, WAVE2); dominant-negative mDia1 or mDia1 siRNA reduces Rif-induced filopodia.\",\n      \"method\": \"FRET in filopodia, siRNA knockdown, dominant-negative mDia1, time-lapse imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET direct interaction combined with RNAi and epistasis experiments, single lab\",\n      \"pmids\": [\"21339294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Actin-capping protein is a physiological regulator of mDia1 that promotes stable detyrosinated microtubule formation; by blocking mDia1 translocation on actin filament barbed ends, capping protein releases mDia1 to act on microtubules; knockdown of capping protein reduces stable MT levels in an mDia1-dependent manner.\",\n      \"method\": \"siRNA knockdown of mDia1 and capping protein, latrunculin A and jasplakinolide treatment, immunofluorescence of stable (Glu) MTs, mDia1 barbed-end translocation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and RNAi manipulation with mDia1-dependent rescue, single lab\",\n      \"pmids\": [\"22918941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"mDia1 controls caveolin-1 (Cav1)/caveolae domain organization downstream of Abl kinases; mDia1 knockdown causes Cav1/caveolae clustering and defective inward trafficking upon loss of cell adhesion; constitutively active mDia1 rescues the Cav1 pool and inward trafficking in Abl-deficient cells.\",\n      \"method\": \"mDia1 siRNA knockdown, constitutively active mDia1 expression, Abl-deficient cells, live imaging of Cav1, electron microscopy of caveolae\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic knockdown plus rescue with active mDia1, single lab\",\n      \"pmids\": [\"22454521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"mDia1 is required for RAGE ligand (AGE)-induced membrane translocation of c-Src, which leads to Rac1 activation, redox phosphorylation of AKT/GSK3β, and vascular smooth muscle cell migration; mDia1 is upregulated in the neointima after vascular injury and its loss significantly reduces pathological neointimal expansion.\",\n      \"method\": \"In vivo femoral artery denudation injury in mDia1 KO and WT mice, primary murine aortic SMC culture, mDia1 siRNA, immunofluorescence of c-Src, Rac1-GTP pull-down, AKT/GSK3β phosphorylation\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO combined with mechanistic in vitro pathway dissection, multi-readout study\",\n      \"pmids\": [\"22511750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Crystal structure of the mDia1 N-terminal regulatory domain in complex with a C-terminal FH2+DAD fragment reveals a tetrameric assembly of two interlocked N+C dimers; the structure shows that DAD engagement by the N-terminus is incompatible with actin filament formation on the FH2 domain, providing structural models for autoinhibition.\",\n      \"method\": \"X-ray crystallography, size exclusion chromatography, in-solution biochemical analysis of oligomeric state\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure combined with solution state characterization, mechanistically informative about autoinhibition\",\n      \"pmids\": [\"20927338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DIAPH1 (mDia1) negatively regulates megakaryocyte proplatelet formation (PPF) by controlling actin and microtubule dynamics; inhibition of both DIAPH1 and ROCK/myosin II together increases PPF, revealing coordinate regulation of both cytoskeletons by these two RhoA effectors.\",\n      \"method\": \"mDia1-knockout mouse megakaryocytes, DIAPH1 siRNA, ROCK inhibitor, confocal imaging of proplatelet formation, cytoskeletal markers\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus pharmacological and siRNA approaches with multiple cytoskeletal readouts, replicated in related studies\",\n      \"pmids\": [\"25298036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"mDia1 initiates lamellipodia and ruffles by nucleating linear actin filaments that serve as seeds for Arp2/3 complex-dependent branched network formation; mDia1 is an EGF-regulated actin nucleator that localizes within nascent and mature membrane ruffles and cooperates sequentially with Arp2/3.\",\n      \"method\": \"mDia1 knockdown and rescue experiments, optogenetics, Arp2/3 pharmacological inhibition (CK-666), fluorescence imaging of ruffles and lamellipodia, migration assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods including optogenetics and pharmacological dissection with functional rescue\",\n      \"pmids\": [\"26349808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A gain-of-function DIAPH1 R1213* variant truncates the DAD domain, disrupts DID-DAD autoinhibitory interaction, and causes constitutive DIAPH1 activation, leading to increased filamentous actin, stable microtubules in platelets and megakaryocytes, reduced proplatelet formation, macrothrombocytopenia, and sensorineural hearing loss.\",\n      \"method\": \"Patient-derived cell studies, DIAPH1 R1213* overexpression in cells, immunofluorescence of F-actin and microtubules, flow cytometry, in vitro megakaryocyte culture\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient variant combined with cellular overexpression showing consistent cytoskeletal phenotypes, multiple assays, replicated in related studies\",\n      \"pmids\": [\"26912466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"An mDia1-INF2 formin activation cascade, scaffolded by IQGAP1, regulates stable detyrosinated microtubule formation downstream of LPA/RhoA; mDia1 promotes INF2 localization to microtubules, and the N-terminus of IQGAP1 directly binds the C-terminus of INF2 to facilitate a tripartite complex.\",\n      \"method\": \"siRNA knockdown of mDia1, INF2, and IQGAP1; constitutively active formin mutants; direct binding assay (IQGAP1-INF2); immunofluorescence of Glu-MTs; LPA stimulation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis through sequential knockdowns plus direct binding assay, single lab\",\n      \"pmids\": [\"27030671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DIAPH1 c.3634+1G>T and c.3610C>T mutations cause C-terminal truncation of DIA1 that disrupts the autoinhibitory DID-DAD interaction (specifically a basic RRKR motif in the DAD), constitutively activating DIA1; this causes increased rates of directional actin polymerization, elongated microvilli, progressive hair cell loss, and DFNA1 hearing loss in mice.\",\n      \"method\": \"Patient-derived mutation analysis, in vitro DID-DAD binding assay, single-molecule actin polymerization imaging, FLAG-DIA1(R1204X) knock-in mouse, auditory brainstem response, hair cell morphology\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro biochemical reconstitution of autoinhibition disruption combined with in vivo mouse model and single-molecule imaging\",\n      \"pmids\": [\"27707755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Small molecule screening identified 13 competitive inhibitors of the ctRAGE-DIAPH1 interaction; these compounds inhibit RAGE-dependent molecular processes in vitro and in vivo, confirming that the ctRAGE-DIAPH1 protein-protein interaction is pharmacologically tractable and functionally important for RAGE signaling.\",\n      \"method\": \"Small molecule screen (58,000 compounds), competitive binding assay for ctRAGE-DIAPH1 interaction, in vitro and in vivo RAGE signaling assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical competitive inhibition assay plus cellular and in vivo functional validation, single lab\",\n      \"pmids\": [\"26936329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Helical rotation of mDia1 during processive actin elongation converts F-actin into a cofilin-resistant state both in vitro and in vivo; tethering mDia1 and the pointed end simultaneously causes untwisting of the F-actin long-pitch helix, which inhibits cofilin binding and severing; constitutively active mDia1ΔC63 in cells produces long-lived, cofilin-dissociating F-actin.\",\n      \"method\": \"Electron micrography of actin helix twist, in vitro cofilin binding and severing assay with tethered vs. free mDia1, single-molecule imaging of mDia1ΔC63 in cells, F-actin lifetime measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biophysical reconstitution with EM structural analysis plus in-cell single-molecule validation\",\n      \"pmids\": [\"29760064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cdk1 phosphorylates DIAPH1 during mitosis to prevent profilin1 binding, thereby maintaining cortical tension at a constant level in metaphase; loss of DIAPH1 phosphorylation causes excess cortical F-actin accumulation, increased cortical tension, and delayed anaphase onset due to spindle assembly checkpoint (SAC) activation.\",\n      \"method\": \"Cdk1 kinase assay, phospho-site mutant DIAPH1 expression, cortical tension measurement (AFM/osmotic assay), SAC reporter, profilin1 binding assay, intra-kinetochore stretch measurement\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay plus phospho-mutant cellular phenotype and biophysical tension measurement in a single rigorous study\",\n      \"pmids\": [\"30816115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Diaph1 (mDia1) promotes myofibroblastic activation of hepatic stellate cells by binding to both TGFβ receptor II (TβRII) and Rab5a via its N-terminal domain; Diaph1 stimulates Rab5a GTPase activity, increases TβRII endocytosis, and is required for SMAD3 phosphorylation and TGFβ1-induced fibrogenic gene expression.\",\n      \"method\": \"shRNA knockdown of Diaph1, SMIFH2 formin inhibitor, co-immunoprecipitation of Diaph1-TβRII and Diaph1-Rab5a, Rab5a activity assay, TβRII internalization assay, SMAD3 phosphorylation, tumor implantation mouse model\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assays combined with functional knockdown, Rab5a activity measurement, and in vivo mouse model\",\n      \"pmids\": [\"32304339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"mDia1 and mDia3 together generate a dynamic cortical F-actin meshwork in Sertoli cells that is continuous with contractile actomyosin bundles; double KO of mDia1/3 impairs this architecture, induces ectopic espin1-containing bundles, disrupts Sertoli-germ cell interactions, and causes spermatogenic failure, establishing mDia1/3 as essential for male fertility.\",\n      \"method\": \"mDia1 and mDia3 double-knockout mice, superresolution microscopy, single-molecule imaging of actin dynamics, immunofluorescence, spermatogenesis histology\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double-KO with superresolution and single-molecule imaging providing mechanistic insight into F-actin architecture in vivo\",\n      \"pmids\": [\"30256801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"mDia1 activity is required for DIAPH1-mediated regulation of SRF-target genes, sarcoplasmic reticulum Ca2+ ATPase expression, and sodium-calcium exchanger expression in cardiomyocytes; Diaph1 knockout reduces infarct size and improves contractile function after ischemia-reperfusion in mice.\",\n      \"method\": \"Diaph1-/- mouse I/R model, siRNA knockdown in H9C2 cells, actin polymerization assay, SRF-reporter, SERCA and NCX western blot\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO in vivo combined with siRNA and mechanistic readouts in vitro, single lab\",\n      \"pmids\": [\"29239839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SPIN90 forms a ternary complex with Arp2/3 and mDia1 in vitro; this complex greatly enhances actin filament nucleation, producing unbranched filaments with mDia1 at barbed ends and SPIN90-Arp2/3 at pointed ends; SPIN90 efficiently recruits mDia1 to SPIN90-Arp2/3-nucleated filaments, lowering branching density and increasing long mDia1-elongated filaments in the cortex.\",\n      \"method\": \"In vitro actin assembly reconstitution, TIRF microscopy of single filaments, biochemical pulldown of ternary complex, cell cortex imaging\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with single-molecule TIRF and biochemical complex formation, single lab\",\n      \"pmids\": [\"32572169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Formin-mediated actin polymerization (specifically by mDia1 and mDia3 at the immune synapse) is required for spatiotemporal control of Zap70-LAT phosphorylation during T cell receptor activation; formin inhibition blocks LAT phosphorylation without affecting Zap70 activation; mDia1/mDia3 localize to the IS upon TCR stimulation and their genetic absence impairs this pathway.\",\n      \"method\": \"mDia1 and mDia3 knockout mice, formin inhibitor (SMIFH2), LAT and Zap70 phosphorylation assay, high-resolution immunofluorescence and 3D reconstruction of IS\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO combined with pharmacological inhibition, multiple imaging and biochemical readouts, formin isoform specificity established\",\n      \"pmids\": [\"31911947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"mDia1-mediated actin polymerization at focal adhesions is activated by contractile force in a pulsatile manner; suppression of mDia1 actin polymerization increases tension on stress fibers and elevates spontaneous stress fiber damage, while reducing efficiency of zyxin-mediated stress fiber repair, establishing force-dependent mDia1 activity as a safety valve against mechanical cytoskeletal damage.\",\n      \"method\": \"Live-cell imaging of mDia1 activity (mDia1-FRET biosensor or GFP-mDia1), mathematical modeling, laser ablation of stress fibers, zyxin-mCherry repair assay, traction force microscopy\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell quantitative imaging with biosensor, mathematical modeling, and direct mechanical perturbation experiments in a single study\",\n      \"pmids\": [\"34822787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAGE229, a small-molecule antagonist of ctRAGE-DIAPH1 interaction, binds ctRAGE (defined by solution NMR), suppresses RAGE-DIAPH1 binding and FRET, and attenuates diabetic complications in mice including reduced mesangial sclerosis, inflammation, and kidney dysfunction, without lowering blood glucose.\",\n      \"method\": \"NMR spectroscopy, FRET assay of ctRAGE-DIAPH1 binding, in vivo streptozotocin diabetes mouse model, kidney histopathology, plasma cytokine measurement\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure-guided interaction inhibition combined with rigorous in vivo efficacy testing, single lab\",\n      \"pmids\": [\"34818060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DIAPH1 mediates SREBP1 nuclear translocation (independently of carbohydrate/insulin cues) through the actin cytoskeleton, promoting hepatic lipid synthesis genes (Acaca, Acacb, Gpat2, Fasn); Diaph1 deletion reduces atherosclerosis and plasma cholesterol/triglycerides in Ldlr-/- mice on Western diet.\",\n      \"method\": \"Ldlr-/- × Diaph1-/- mouse atherosclerosis model, hepatic gene expression (qPCR), SREBP1 nuclear translocation immunofluorescence, plasma lipid measurement, actin cytoskeleton manipulation\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO in vivo with mechanistic SREBP1 nuclear localization assay, single lab\",\n      \"pmids\": [\"36932214\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DIAPH1 (mDia1) is an autoinhibited Rho-family GTPase effector whose DID-DAD intramolecular interaction is disrupted by GTP-RhoA binding, releasing the FH1-FH2 module to processively nucleate and elongate unbranched actin filaments via helical rotation; it coordinates the actin and microtubule cytoskeletons, acts as the essential cytoplasmic effector of RAGE signaling, is phosphorylated by Cdk1 to control mitotic cortical tension and spindle assembly checkpoint inactivation, and is required for diverse cellular processes including stress fiber and focal adhesion formation, T cell and immune cell trafficking, megakaryocyte proplatelet formation, T cell receptor signaling (spatiotemporal LAT phosphorylation), vascular remodeling, and steroidogenic mitochondrial trafficking.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DIAPH1 (mDia1) is an autoinhibited Rho-family GTPase effector that nucleates and processively elongates unbranched actin filaments, coordinating the actin and microtubule cytoskeletons to drive cell migration, polarity, division, and immune and vascular signaling [#0, #2, #8]. In the resting state, an intramolecular DID-DAD interaction holds the protein inactive; GTP-RhoA binds the regulatory N-terminal domain at a site that overlaps the DAD-binding surface, displacing the DAD and releasing the FH1-FH2 module, as defined by crystal and NMR structures of the dimeric N-terminal armadillo-repeat domain and of an N-terminal/FH2-DAD assembly [#11, #35]. The released FH2 domain dimerizes to nucleate actin, protects barbed ends from capping protein, and elongates filaments processively while undergoing helical rotation around the filament; the FH1 domain recruits profilin-actin and this rotation renders filaments resistant to cofilin severing [#7, #8, #24, #42]. mDia1 nucleation frequency is tuned directly by free G-actin concentration, and its activity is further modulated by cofactors including Flightless-I, APC, and SPIN90-Arp2/3, the latter coupling linear mDia1 elongation to branched network formation [#17, #22, #23, #47]. Through these activities mDia1 builds stress fibers downstream of RhoA in balance with ROCK, drives force-induced focal adhesion maturation and mechanosensitive stress-fiber repair, activates serum response factor by depleting the G-actin pool, and aligns microtubules with actin to control cell polarity, MTOC orientation, and focal-adhesion turnover [#0, #1, #6, #13, #49]. It directly binds and engages microtubules through the FH2 domain and acts in formin cascades with INF2 (scaffolded by IQGAP1) and with capping protein to generate stable detyrosinated microtubules [#28, #32, #39]. mDia1 also serves as the essential membrane-proximal cytoplasmic effector of RAGE, binding the RAGE cytoplasmic tail to transduce ligand-stimulated AKT signaling, a protein-protein interaction that is pharmacologically tractable and whose inhibition attenuates diabetic complications and vascular neointimal expansion [#27, #34, #41, #50]. In vivo it is required for T lymphocyte trafficking, NK and macrophage cytoskeletal organization, TCR-driven spatiotemporal LAT phosphorylation, hematopoietic progenitor homeostasis, megakaryocyte proplatelet formation, and male fertility, and is phosphorylated by Cdk1 to restrain profilin binding and cortical tension during metaphase, preventing inappropriate spindle assembly checkpoint activation [#14, #15, #19, #20, #36, #43, #45, #48]. Gain-of-function truncations that delete the DAD constitutively activate DIAPH1, causing increased F-actin and stabilized microtubules, macrothrombocytopenia, and DFNA1 sensorineural hearing loss [#38, #40].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established mDia1 as a RhoA effector for actin organization, answering how active RhoA produces distinct actin architectures.\",\n      \"evidence\": \"Constitutively active and dominant-negative mDia1 constructs with actin imaging, showing mDia1 and ROCK act concurrently downstream of Rho\",\n      \"pmids\": [\"10559899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of autoinhibition release not yet structurally defined\", \"Biochemical actin activity not yet reconstituted\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined mDia1 as a mechanosensing effector and a coordinator of actin and microtubules, separating its functions from ROCK/myosin contractility.\",\n      \"evidence\": \"Force application with live imaging of focal contacts plus FH2 point mutagenesis dissociating microtubule alignment from actin accumulation; spindle localization mapped to an FH3 segment\",\n      \"pmids\": [\"11402062\", \"11146620\", \"11171383\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of FH2-microtubule coordination unresolved\", \"Spindle function of mDia1 not yet established\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Connected mDia1 actin assembly to transcription and to Rac crosstalk, answering how a formin influences gene expression and adjacent GTPase activity.\",\n      \"evidence\": \"SRF reporter with non-polymerizable actin mutant placing actin assembly upstream of SRF; epistasis with Cas/Src/Crk/DOCK180 for Rho-dependent Rac activation\",\n      \"pmids\": [\"12429848\", \"12021256\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct link between mDia1 and the Rac-activation machinery not biochemically defined\", \"In vivo relevance of SRF activation unaddressed\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Reconstituted mDia1 as a processive barbed-end actin nucleator/elongator and showed autoinhibition biochemically, answering its core enzymatic mechanism.\",\n      \"evidence\": \"Pyrene-actin assays with purified FH1-FH2 and N-terminal constructs, barbed-end capping protection, yeast complementation, plus genetic KO showing Drf3 compensation\",\n      \"pmids\": [\"12906795\", \"14657240\", \"12676083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the autoinhibited state not yet solved\", \"GDP- vs GTP-RhoA effect on relief incompletely resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Provided the structural basis for RhoA-mediated activation, answering how GTP-RhoA competes with the DAD to relieve autoinhibition.\",\n      \"evidence\": \"Crystal structure of the dimeric N-terminal DID domain with NMR/biochemical mapping of overlapping RhoA and DAD sites\",\n      \"pmids\": [\"15866170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational dynamics of full-length activation not captured\", \"FH2 release upon DAD displacement not directly visualized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed autoinhibition controls both actin activity and membrane localization, framing dual regulation as a general DRF principle.\",\n      \"evidence\": \"In vitro actin assays plus localization of GTPase-binding-deficient GFP-mDia1 variants\",\n      \"pmids\": [\"16943183\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study without reconstitution of the localization determinant\", \"Membrane receptor mediating localization not identified here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established in vivo requirements for mDia1 in immune trafficking and hematopoiesis, and placed it downstream of a Galpha12/13-LARG-RhoA axis for MTOC polarization.\",\n      \"evidence\": \"mDia1 knockout mice with lymphocyte trafficking, chemotaxis, and hematopoietic phenotyping; Galpha12/13-deficient MEFs with LARG-pericentrin co-IP and MTOC assays\",\n      \"pmids\": [\"17682067\", \"17699759\", \"17959834\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-intrinsic vs systemic contributions to myeloproliferation not fully separated\", \"Mechanism linking mDia1 to MTOC orientation incompletely defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined G-actin concentration as a direct regulator of mDia1 nucleation and identified Memo as upstream of membrane-localized RhoA-mDia1.\",\n      \"evidence\": \"Single-molecule imaging with latrunculin and modeling; Memo siRNA with RhoA/mDia1 localization imaging in breast carcinoma cells\",\n      \"pmids\": [\"18827014\", \"18955552\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological range of G-actin tuning in vivo not established\", \"Direct vs indirect Memo-RhoA mechanism not biochemically defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved the helical-rotation elongation mechanism and the autoinhibited tetrameric structure, and identified cooperative cofactors (APC, Fli-I) and a Src-trafficking/oncogenic role.\",\n      \"evidence\": \"Single-molecule fluorescence polarization of elongation; crystal structure of N+C tetramer; in vitro reconstitution with APC-B and Flightless-I; mDia1-KO MEFs with v-Src trafficking and tumor assays; steroidogenic and Golgi imaging\",\n      \"pmids\": [\"21148346\", \"20927338\", \"20566685\", \"20223827\", \"20679479\", \"20591975\", \"21680709\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How rotation couples to physiological filament functions left open\", \"In vivo contribution of APC/Fli-I cofactors unaddressed\", \"Src-transport mechanism along actin not molecularly resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established mDia1 as the essential intracellular effector of RAGE and mapped its microtubule-binding and filopodial partnerships, broadening its receptor and cytoskeletal interactomes.\",\n      \"evidence\": \"NMR structure of ctRAGE-mDia1 interface with AKT/migration assays; in vitro microtubule co-sedimentation; FRET/RNAi defining CLIP-170, IRSp53, and Rif partnerships\",\n      \"pmids\": [\"22194616\", \"21998204\", \"19114595\", \"22179776\", \"21339294\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling chain from ctRAGE-mDia1 to AKT incompletely defined\", \"Stoichiometry of simultaneous actin and microtubule engagement in cells unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked mDia1 to stable microtubule formation via capping-protein hand-off and to membrane-domain trafficking, plus an in vivo vascular RAGE pathway.\",\n      \"evidence\": \"RNAi/pharmacology showing capping protein releases mDia1 to act on MTs; Cav1/caveolae trafficking downstream of Abl; mDia1-KO femoral artery injury with c-Src/Rac1/AKT pathway dissection\",\n      \"pmids\": [\"22918941\", \"22454521\", \"22511750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mDia1-microtubule stabilization step not isolated from actin effects\", \"Caveolae regulation mechanism single-lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified DIAPH1 gain-of-function disease alleles and an mDia1-INF2 formin cascade, and validated the ctRAGE-DIAPH1 interaction as druggable.\",\n      \"evidence\": \"Patient R1213*/C-terminal truncation studies with knock-in mice (macrothrombocytopenia, DFNA1 hearing loss); siRNA epistasis defining IQGAP1-scaffolded mDia1-INF2; small-molecule competitive inhibitor screen\",\n      \"pmids\": [\"26912466\", \"27707755\", \"27030671\", \"26936329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific consequences of constitutive activation incompletely mapped\", \"In vivo selectivity of early ctRAGE-DIAPH1 inhibitors not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined cofilin-resistance via helical rotation, Cdk1 control of mitotic cortical tension, a TGFbeta-receptor endocytic role, and essential function in spermatogenesis.\",\n      \"evidence\": \"EM/cofilin assays with tethered mDia1; Cdk1 phospho-mutant DIAPH1 with cortical tension and SAC measurements; Diaph1-TbetaRII/Rab5a co-IP with internalization assays; mDia1/3 double-KO superresolution in Sertoli cells\",\n      \"pmids\": [\"29760064\", \"30816115\", \"32304339\", \"30256801\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase-substrate spatial regulation of Cdk1-DIAPH1 in cells not fully resolved\", \"Direct vs scaffold role in TbetaRII endocytosis incompletely separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established mDia1/mDia3 control of TCR-driven LAT phosphorylation and an mDia1-SPIN90-Arp2/3 ternary complex coupling linear and branched actin networks.\",\n      \"evidence\": \"mDia1/mDia3 KO mice plus SMIFH2 with LAT/Zap70 phospho and IS imaging; in vitro reconstitution and TIRF of the SPIN90-Arp2/3-mDia1 complex\",\n      \"pmids\": [\"31911947\", \"32572169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How formin-built filaments spatially gate LAT phosphorylation unresolved\", \"In vivo prevalence of SPIN90-mDia1 cortical filaments not quantified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined force-activated pulsatile mDia1 activity as a stress-fiber safety valve and advanced a structure-guided RAGE-DIAPH1 antagonist for diabetic complications.\",\n      \"evidence\": \"mDia1 biosensor imaging with laser ablation, traction force microscopy, and modeling; NMR-defined RAGE229 with in vivo streptozotocin diabetic kidney efficacy\",\n      \"pmids\": [\"34822787\", \"34818060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Force-sensing molecular trigger of mDia1 activation not identified\", \"Long-term and tissue-broad efficacy/safety of RAGE229 untested here\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended DIAPH1 function to metabolic regulation via actin-dependent SREBP1 nuclear translocation and lipid synthesis.\",\n      \"evidence\": \"Ldlr-/- x Diaph1-/- atherosclerosis model with hepatic lipogenic gene expression and SREBP1 nuclear localization imaging\",\n      \"pmids\": [\"36932214\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking actin dynamics to SREBP1 transport unresolved\", \"Single-lab in vivo correlation between actin state and SREBP1 translocation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse upstream activators (RhoA, Rif, RAGE, Memo, force) are integrated to direct mDia1 to specific subcellular sites and substrate cytoskeletons remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of mDia1 spatial targeting across stimuli\", \"Quantitative rules governing actin vs microtubule engagement in vivo unknown\", \"Selective therapeutic modulation of individual mDia1 functions untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [7, 8, 24, 42]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [8, 24, 28, 32]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 27, 34]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [22, 23, 44, 47]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [20, 39, 44]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 2, 28]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [12, 18, 27, 37]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [3, 10, 24]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 27, 34]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 24, 43]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [14, 19, 20, 48]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 46, 51]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [26, 33, 44]}\n    ],\n    \"complexes\": [\n      \"ctRAGE-DIAPH1 complex\",\n      \"SPIN90-Arp2/3-mDia1 ternary complex\",\n      \"mDia1-INF2-IQGAP1 complex\",\n      \"Hck-WASp-mDia1 complex\"\n    ],\n    \"partners\": [\n      \"RHOA\",\n      \"RAGE\",\n      \"INF2\",\n      \"IQGAP1\",\n      \"PKD2\",\n      \"CLIP-170\",\n      \"IRSp53\",\n      \"SPIN90\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":{"gene":"DIAPH1","tier":"GROUNDING","verdict":"Evidence-grounding concern","subtype":"fabrication","uniprot_band":"rich","rules_fired":"R7","issue":"R7: fabricated (no corpus paper): 19427913"},"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}