{"gene":"DAAM1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2001,"finding":"DAAM1 binds directly to both Dishevelled (Dvl) and RhoA, acting as a molecular bridge that mediates Wnt/Frizzled-induced Dvl-Rho complex formation and Rho activation downstream of Frizzled receptor signaling. Inhibition or depletion of Daam1 prevents Wnt/Fz activation of Rho and blocks Xenopus gastrulation without affecting beta-catenin signaling, placing Daam1 specifically in the non-canonical Wnt/PCP branch.","method":"Co-immunoprecipitation, dominant-negative/depletion experiments in human cells and Xenopus embryos, genetic epistasis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and functional rescue in two systems (human cells + Xenopus), replicated extensively by subsequent studies","pmids":["11779461"],"is_preprint":false},{"year":2007,"finding":"DAAM1 activation is mediated primarily by Dishevelled (Dvl) binding rather than by Rho. Dvl binds to the DAD (diaphanous autoregulatory domain) of DAAM1, disrupting the intramolecular GBD/DID–DAD autoinhibitory interaction. Removal of the DAD or DAD mutations convert DAAM1 into an active protein capable of inducing Rho activation. Thus, Dvl acts upstream of Daam1, which in turn activates RhoA.","method":"Domain-deletion mutagenesis, co-immunoprecipitation, Xenopus convergent extension rescue assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis of active site/regulatory domain combined with functional embryo rescue, single lab but multiple orthogonal methods","pmids":["18162551"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of the DAAM1 FH2 domain at 2.25 Å resolution reveals a tethered-dimer architecture similar to yeast Bni1 but with a novel 'locked' conformation in which two beta-strands formed by linker ends occlude the actin-binding surfaces. Mutations disrupting this beta-strand lock increase actin assembly activity ~10-fold, indicating this occluded conformation represents an autoinhibited state of the FH2 domain.","method":"X-ray crystallography (SAD phasing, 2.25 Å), site-directed mutagenesis, in vitro actin assembly assay","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis validation and functional actin assembly assay in a single rigorous study","pmids":["17482208"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of human DAAM1 FH2 domain at 2.8 Å shows a head-to-tail ring-shaped dimer. Actin assembly assays with DAAM1 mutants demonstrate that the length of the linker connecting the N-terminal domain to the core FH2 region is critical for actin assembly activity.","method":"X-ray crystallography, in vitro actin assembly assays with FH2 mutants","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure combined with functional mutagenesis and in vitro actin assembly assay","pmids":["17986009"],"is_preprint":false},{"year":2006,"finding":"Profilin1 interacts with the FH1 domain of DAAM1 and co-localizes with DAAM1 on actin stress fibers in response to Wnt signaling. Depletion of Profilin1 inhibits stress fiber formation induced by non-canonical Wnt signaling in mammalian cells, placing Profilin1 as a downstream effector of DAAM1 for cytoskeletal changes.","method":"Co-immunoprecipitation, immunofluorescence, siRNA knockdown with actin phenotype readout in mammalian cells and Xenopus","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus functional depletion phenotype in two organisms, single lab","pmids":["17021034"],"is_preprint":false},{"year":2006,"finding":"DAAM1 binds RhoA and Cdc42 in a GTP-dependent manner and interacts with the SH3 domain of CIP4 (Cdc42 effector). DAAM1 also interacts and collaborates with non-receptor tyrosine kinase Src to induce branched protrusion formation. Ectopic DAAM1 expression induces cell rounding, branched protrusions, and reduction of stress fibers.","method":"Yeast two-hybrid, co-immunoprecipitation, GTPase pull-down assays, cell morphology overexpression experiments","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple Co-IP/pulldown methods and overexpression phenotype, single lab","pmids":["16630611"],"is_preprint":false},{"year":2007,"finding":"In zebrafish notochord, DAAM1 dynamically changes subcellular localization during convergent extension: early it forms a complex with EphB receptors and Dishevelled 2 that is incorporated into dynamin-dependent endocytic vesicles, removing EphB from the cell surface to switch cell adhesiveness; later, DAAM1 co-localizes with the actin cytoskeleton to drive cell extension.","method":"Co-immunoprecipitation, live imaging, dynamin dominant-negative inhibition, subcellular fractionation in zebrafish","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and live imaging with functional dynamin block, single lab, two orthogonal methods","pmids":["17412835"],"is_preprint":false},{"year":2010,"finding":"Constitutively active C-terminal DAAM1 inhibits endothelial cell proliferation and migration by inducing microtubule (MT) stabilization, not solely actin polymerization. MT stabilization alone was sufficient to reproduce the inhibitory effect; actin polymerization inhibition alone (jasplakinolide) was not. This places DAAM1 as a regulator of MT stability in endothelial cells downstream of Wnt/PCP signaling.","method":"Expression of constitutively active DAAM1 construct, pharmacological dissection (jasplakinolide, MT stabilizers), endothelial cell proliferation/migration/network formation assays in vitro and in vivo","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection with multiple readouts, single lab","pmids":["20351293"],"is_preprint":false},{"year":2010,"finding":"DAAM1 localizes to acto-myosin stress fibers, specifically co-localizing with myosin IIB-containing ventral actin stress fibers. The N-terminal region of DAAM1 (residues 1–440) is responsible for this targeting and interacts with myosin IIB fibers independently of F-actin or RhoA binding. DAAM1 depletion blocks centrosome/Golgi reorientation during wound healing, revealing a role in cell polarity establishment.","method":"Specific antibody immunofluorescence, N-terminal truncation constructs, wound-healing polarity assays, DAAM1-stable overexpression lines in U2OS cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping, immunofluorescence co-localization, and functional depletion phenotype, single lab","pmids":["20927366"],"is_preprint":false},{"year":2010,"finding":"Flightless-I (Fli-I), a gelsolin family protein, binds directly to DAAM1 and mDia1, enhances their intrinsic actin assembly activity in vitro, and promotes GTP-Rho-mediated relief of DAAM1 autoinhibition. Fli-I is required for DAAM1-induced actin assembly in living cells.","method":"Direct binding assays, in vitro actin assembly assay, siRNA knockdown with actin assembly readout","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution of actin assembly plus cell-based knockdown, single lab, two orthogonal methods","pmids":["20223827"],"is_preprint":false},{"year":2011,"finding":"Daam1-deficient mice exhibit ventricular noncompaction, double outlet right ventricles, and septal defects with embryonic/neonatal lethality. Daam1 is required for filamentous actin assembly and organization in cardiomyocytes. Importantly, Daam1-mediated cytoskeletal regulation in the heart does not operate through RhoA, Rac1, or Cdc42.","method":"Gene-trap knockout mice, in vivo genetic rescue, F-actin assembly/organization assays in cardiomyocytes, small GTPase activity assays (negative results for RhoA/Rac1/Cdc42)","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous KO mouse model with genetic rescue and biochemical mechanistic dissection, replicated in heart-specific KO","pmids":["21177343"],"is_preprint":false},{"year":2013,"finding":"DAAM1 is a potent actin-bundling protein that localizes along the entire filopodial shaft (not only tips). Fascin co-immunoprecipitates with DAAM1 from cell extracts; purified fascin directly binds DAAM1; and single-molecule TIRF imaging shows fascin recruits DAAM1 to and stabilizes DAAM1 on actin bundles in vitro. Silencing fascin causes loss of DAAM1 from filopodial shafts. Together, DAAM1 and fascin directly collaborate in actin bundling required for filopodial formation.","method":"Co-immunoprecipitation, in vitro pull-down with purified proteins, single-molecule TIRF microscopy, siRNA knockdown with filopodia morphology readout","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstitution with purified proteins plus single-molecule imaging plus cellular knockdown, multiple orthogonal methods in single study","pmids":["23850281"],"is_preprint":false},{"year":2015,"finding":"Inturned acts as an adaptor protein forming a ternary complex with NPHP4 and DAAM1 in multiciliated cells of Xenopus epidermis. Knockdown of daam1 (but not formin-2) disrupts the subapical actin web required for proper cilia polarization and directional fluid flow, placing DAAM1 downstream of Inturned/NPHP4 in organizing the subapical actin network.","method":"Co-immunoprecipitation, morpholino knockdown in Xenopus multiciliated cells, immunofluorescence of subapical actin and basal bodies","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating ternary complex plus specific knockdown phenotype, single lab, two orthogonal methods","pmids":["26644512"],"is_preprint":false},{"year":2015,"finding":"Piccolo directly binds Daam1 at presynaptic active zones. Daam1 activation promotes Piccolo binding and spatially directs F-actin polymerization at the active zone. Daam1 loss-of-function impairs presynaptic F-actin assembly in neurons, similar to loss of Piccolo or Profilin.","method":"Co-immunoprecipitation, protein-protein interaction assays, Daam1 overexpression/knockdown with presynaptic F-actin readout in neurons","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus functional loss-of-function phenotype in neurons, single lab","pmids":["25897839"],"is_preprint":false},{"year":2015,"finding":"DAAM1 and DAAM2 are co-required for sarcomere assembly and myocardial maturation. Myocardial-specific Daam1 CKO mice have noncompaction cardiomyopathy and disordered cardiomyocyte polarity; Daam1/Daam2 double KO (DKO) mice show severely disrupted sarcomere structure and reduced cardiac function. Genetic interaction with Wnt5a (Daam1 CKO in Wnt5a-null background worsens phenotype) confirms DAAM1 acts in the Wnt5a pathway. RhoA was unaffected in DKO hearts, but AKT activity was reduced.","method":"Conditional knockout mice (floxed allele), Daam1/2 double KO, genetic epistasis with Wnt5a null, sarcomere structure analysis, cardiac function measurements","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models including conditional KO, double KO, and epistasis cross, multiple orthogonal readouts","pmids":["26526197"],"is_preprint":false},{"year":2016,"finding":"DAAM1 accumulates at lateral membrane contacts (LCs) of epithelial junctions and regulates the actin filaments there. DAAM1 depletion disperses actin filaments at LCs, enhances LC membrane motility (dependent on the WAVE complex and its downstream targets), and causes invasion of neighboring cell layers, disrupting polarized epithelial architecture.","method":"siRNA knockdown, immunofluorescence, live-cell imaging of membrane motility, WAVE complex component co-depletion epistasis","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with WAVE complex plus live imaging and knockdown phenotype, single lab","pmids":["27807130"],"is_preprint":false},{"year":2016,"finding":"Kif26b (a kinesin) is recruited into the Dvl3/DAAM1 complex. Kif26b and DAAM1 cooperatively regulate endothelial cell tip-cell polarization and directed migration via microtubule stabilization and MTOC/Golgi repositioning. Ectopic Kif26b expression rescues the polarization defect caused by DAAM1 depletion, indicating Kif26b acts downstream of or in parallel to DAAM1 in the Dvl3/DAAM1 PCP complex.","method":"Co-immunoprecipitation, siRNA knockdown, 3D angiogenesis assay, MTOC/Golgi localization analysis, rescue experiment","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of ternary complex plus functional rescue experiment, single lab","pmids":["26792835"],"is_preprint":false},{"year":2016,"finding":"DAAM1 localizes at cytoplasmic actin nodes and is immobilized there (demonstrated by photoactivatable tracking). Forced membrane targeting of DAAM1 via rapamycin-dependent linkage enhances F-actin assembly at the plasma membrane relative to cytoplasm, demonstrating that DAAM1's localization determines the site of actin network assembly during cytoskeletal recovery.","method":"Photoactivatable GFP tracking, rapamycin-inducible membrane targeting, Latrunculin A washout actin recovery assay, live-cell imaging","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization tracking with functional consequence shown by chemogenetic membrane targeting, single lab","pmids":["27760153"],"is_preprint":false},{"year":2018,"finding":"MTSS1 (inverse-BAR protein) binds to DAAM1 at its C-terminus and pauses DAAM1-mediated F-actin polymerization, as shown by single-molecule speckle microscopy. DAAM1 localizes to the tips of Purkinje cell dendritic filopodia and its overactivation causes excessive contact-induced retraction, phenocopying MTSS1 knockout. MTSS1 thus functions as a formin inhibitor of DAAM1 to control dendritic filopodial length and final neuronal morphology.","method":"Single-molecule speckle microscopy of F-actin polymerization, Co-IP, conditional knockout mice (MTSS1), overactivation constructs with dendritic morphology readout","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — single-molecule in vitro reconstitution of actin polymerization plus in vivo KO phenotype, single lab but multiple orthogonal methods","pmids":["29972794"],"is_preprint":false},{"year":2018,"finding":"Integrin αvβ3 associates (indirectly) with the C-terminal DAD domain of DAAM1 in breast cancer cells. Type IV collagen activates integrin αvβ3→DAAM1→RhoA signaling to promote invadopodia extension and cell haptotaxis. DAAM1 knockdown or dominant-negative N-DAAM1 abrogates collagen-induced RhoA activity, stress fiber assembly, invadopodia extension, and haptotaxis.","method":"Immunoprecipitation, GST pull-down, shRNA knockdown, dominant-negative constructs, RhoA activity assay, Boyden chamber haptotaxis assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple biochemical methods (IP and pulldown) plus loss-of-function with defined mechanistic pathway, single lab","pmids":["29752407"],"is_preprint":false},{"year":2018,"finding":"DAAM1 FH2 domain directly binds the Borrelia burgdorferi surface lipoprotein BBA66, as demonstrated by yeast two-hybrid, ELISA, pull-down, and co-immunoprecipitation with recombinant proteins. This interaction mediates coiling phagocytosis of B. burgdorferi by human neuroglial cells; BBA66-deficient mutant strains show strongly reduced coiling.","method":"Yeast two-hybrid, recombinant protein pull-down, co-immunoprecipitation, ELISA, confocal colocalization, anti-Daam1 antibody blocking","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal binding assays with recombinant proteins plus functional blocking, single lab","pmids":["29746581"],"is_preprint":false},{"year":2019,"finding":"PTPN3 (a FERM/PDZ-domain phosphatase) inhibits Src activity and thereby prevents Src-mediated phosphorylation of DAAM1 at Tyr652. Tyr652 phosphorylation of DAAM1 is required for DAAM1 homodimer formation and actin polymerization. A phosphodeficient DAAM1 mutant (Y652F) inhibits F-actin assembly and suppresses lung cancer cell migration and invasion.","method":"Protein interaction assays (Co-IP/pulldown), Src kinase assay, phosphorylation site mutagenesis, in vitro actin polymerization assay, cancer cell migration/invasion assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — identification of specific phosphorylation site by mutagenesis validated with in vitro actin assay and functional cancer cell phenotype, single lab, multiple orthogonal methods","pmids":["31406243"],"is_preprint":false},{"year":2019,"finding":"In the developing Xenopus nephron, DAAM1 functions in pronephric tubulogenesis through a Daam1/WGEF (ArhGEF19)/Rho signaling branch of the Wnt/PCP pathway. Knockdown of Daam1 reduces late pronephric epithelial markers; inhibiting multiple nodes of the Daam1 pathway reduces tubulogenesis without affecting early patterning.","method":"Morpholino knockdown in Xenopus and zebrafish, epistasis experiments along the pathway, marker gene expression analysis","journal":"Journal of the American Society of Nephrology : JASN","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis across multiple pathway nodes in two model organisms, single lab","pmids":["21804089"],"is_preprint":false},{"year":2020,"finding":"WNT11-FZD7-DAAM1 signaling activates Rho-ROCK1/2-Myosin II to drive amoeboid invasion, tumour-initiating potential, and metastasis in melanoma cells. Mechanistically, WNT11 signals through the Frizzled-7 receptor to DAAM1, which then activates the RhoA-ROCK1/2-Myosin II axis.","method":"siRNA/shRNA knockdown, dominant-negative constructs, RhoA/Myosin II activity assays, in vivo metastasis models, pathway epistasis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined pathway epistasis and in vivo readout, single study","pmids":["33082334"],"is_preprint":false},{"year":2020,"finding":"Daam1/2 double knockout in intestinal cells stimulates canonical Wnt signaling by preventing RNF43-dependent degradation of the Frizzled (Fzd) receptor. Daam1/2 interact with the Wnt inhibitor RNF43. Loss of Daam1/2 thus impairs noncanonical Wnt/PCP signaling and disrupts Paneth cell differentiation, demonstrating that DAAM1 asymmetrically regulates canonical vs. noncanonical Wnt branches.","method":"Daam1/2 double knockout organoids/mice, Co-immunoprecipitation of Daam1/2 with RNF43, single-cell RNA sequencing, Wnt reporter assays","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of DAAM1-RNF43 interaction plus genetic KO with canonical/noncanonical pathway dissection, single lab","pmids":["38000028"],"is_preprint":false},{"year":2021,"finding":"YWHAZ (14-3-3ζ) directly interacts with and co-localizes with DAAM1 in breast cancer cells. This YWHAZ-DAAM1 complex is required for DAAM1-mediated microfilament remodeling and RhoA activation. MiR-613 directly targets both YWHAZ and DAAM1, and blocking the YWHAZ-DAAM1 complex inhibits cell migration.","method":"Co-immunoprecipitation, immunofluorescence co-localization, siRNA/overexpression experiments, RhoA activity assay, luciferase reporter for miR-613 targeting","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP with functional loss-of-function phenotype, single lab","pmids":["34453038"],"is_preprint":false},{"year":2021,"finding":"Daam1 localizes to newly formed cell contacts in the developing nephron, and its depletion decreases junctional F-actin microfilament localization and slows F-actin turnover. The FH2 domain of DAAM1 mediates efficient localization of junctional E-cadherin. Daam1 depletion impairs organized movement of renal cells, demonstrating that Daam1 formin activity is required for E-cadherin-based intercellular adhesion and epithelial organization.","method":"Live imaging in Xenopus nephron and MDCK cells, siRNA knockdown, FH2 domain mutant rescue, junctional F-actin and E-cadherin localization assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mutant rescue with live imaging and multiple cellular readouts, single lab","pmids":["34233186"],"is_preprint":false},{"year":2021,"finding":"Daam1 interacts with Fascin via its formin homology (FH) domains, specifically the FH2 domain, in breast cancer cells. Co-knockdown of Daam1 or Fascin prevents their co-localization on actin filaments and impairs pseudopodia formation and cell migration, confirming that Daam1-Fascin interaction through FH2 is required for actin filament assembly and cell motility.","method":"Co-immunoprecipitation, domain-mapping pulldown (FH1, FH2, DAD constructs), immunofluorescence co-localization, siRNA knockdown with migration assay","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — domain-level binding mapping plus functional knockdown phenotype, single lab","pmids":["33458919"],"is_preprint":false},{"year":2023,"finding":"DAAM1 FH2 domain binds to and inhibits the deubiquitinase (DUB) activity of USP10 independently of DAAM1's actin-polymerizing functions. This interaction prevents USP10 from deubiquitinating αv-integrins, thereby suppressing integrin cell surface accumulation. Loss of DAAM1 increases αv-, β1-, β5-integrin levels, recycling, and fibronectin deposition, promoting myofibroblast differentiation.","method":"Yeast two-hybrid, proximity ligation assay (PLA), co-immunoprecipitation, DUB activity assay with DAAM1 FH2 domain, siRNA knockdown, integrin ubiquitination assays","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — yeast two-hybrid interaction validated by PLA and Co-IP, with in vitro DUB activity assay using FH2 domain, single lab","pmids":["37562219"],"is_preprint":false},{"year":2024,"finding":"RIL (Reversion Induced LIM domain protein) is a new binding partner of Daam1, interacting with the C-terminal actin-nucleating portion of Daam1 in a Wnt-responsive manner. RIL co-localizes with Daam1 at the plasma membrane on actin fibers. Loss of both RIL and Daam1 synergizes to produce severe Xenopus gastrulation defects, indicating they function in the same non-canonical Wnt signaling pathway. RIL also synergizes with another Daam1-interacting protein FNBP1.","method":"Co-immunoprecipitation, immunofluorescence, gain/loss-of-function in Xenopus, genetic epistasis (double knockdown synergy)","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with genetic epistasis in two interacting partners, single lab","pmids":["38968989"],"is_preprint":false},{"year":2025,"finding":"A conserved neuronal microexon within the DAAM1 FH2 domain (extending the FH2 linker region) alters actin polymerization. Genomic deletion of this microexon in mice causes neuritogenesis defects, increased calcium influx, fewer immature dendritic spines, impaired long-term potentiation, and memory deficits. These phenotypes are associated with increased RHOA/ROCK signaling and are partially rescued by ROCK inhibitor treatment, placing the microexon as a modulator of DAAM1-dependent RHOA/ROCK signaling in neurons.","method":"Genomic microexon deletion (CRISPR), in vitro actin polymerization assay, LTP electrophysiology, dendritic spine analysis, calcium imaging, behavioral memory tests, pharmacological ROCK inhibitor rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods including in vitro actin assay, in vivo KO, electrophysiology, pharmacological rescue in a single rigorous study","pmids":["40328765"],"is_preprint":false}],"current_model":"DAAM1 is a diaphanous-related formin that functions as a core scaffold in the non-canonical Wnt/PCP pathway: activated by Dishevelled (Dvl) binding to its DAD domain (which relieves autoinhibition rather than Rho binding per se), DAAM1 bridges Dvl to RhoA activation, nucleates and bundles unbranched actin filaments via its FH2 domain (whose activity is modulated by a locked beta-strand conformation and by a neuronal microexon), interacts with Profilin1 (via FH1), Fascin, Flightless-I, MTSS1, YWHAZ, Src-mediated Tyr652 phosphorylation, and USP10, and coordinates cytoskeletal dynamics (actin stress fibers, filopodia, lateral membrane actin, presynaptic F-actin, subapical actin in multiciliated cells) as well as microtubule stabilization, thereby controlling cell polarity, migration, gastrulation, heart morphogenesis/sarcomere assembly, epithelial junction stability, ciliogenesis, phagocytosis, and synaptic plasticity."},"narrative":{"mechanistic_narrative":"DAAM1 is a diaphanous-related formin that serves as a core actin-nucleating scaffold in the non-canonical Wnt/planar cell polarity (PCP) pathway, coupling Wnt/Frizzled signaling to Rho-dependent cytoskeletal remodeling [PMID:11779461]. It acts as a molecular bridge that physically links Dishevelled (Dvl) to RhoA, and Dvl-mediated relief of an intramolecular DAD–DID/GBD autoinhibitory interaction is the principal mode of DAAM1 activation, converting it into a Rho-activating effector [PMID:11779461, PMID:18162551]. Once active, DAAM1 nucleates and bundles unbranched actin filaments through its FH2 domain, whose intrinsic assembly activity is gated by a 'locked' beta-strand conformation and by the length of the linker connecting the N-terminal region to the FH2 core [PMID:17482208, PMID:17986009]. Productive filament assembly requires cooperating factors: Profilin1 engages the FH1 domain to drive Wnt-induced stress-fiber formation [PMID:17021034], Flightless-I enhances FH2 actin-assembly activity and aids Rho-dependent activation [PMID:20223827], and Fascin binds the FH2 domain to recruit and stabilize DAAM1 along filopodial and pseudopodial actin bundles [PMID:23850281, PMID:33458919]. DAAM1 activity is further tuned post-translationally, requiring Src-mediated Tyr652 phosphorylation for homodimerization and actin polymerization—an event antagonized by the phosphatase-regulator PTPN3 [PMID:31406243]. Through these activities DAAM1 organizes diverse actin-based structures and supports microtubule stabilization and MTOC/Golgi reorientation during directed migration and tip-cell polarization [PMID:20351293, PMID:20927366, PMID:26792835]. Physiologically, DAAM1 is essential for vertebrate gastrulation and convergent extension [PMID:11779461], heart morphogenesis and sarcomere assembly downstream of Wnt5a (independently of RhoA in cardiomyocytes) [PMID:21177343, PMID:26526197], epithelial junction stability and E-cadherin-based adhesion [PMID:34233186], subapical actin organization in multiciliated cells via an Inturned/NPHP4 complex [PMID:26644512], and presynaptic and dendritic actin remodeling, with a neuronal FH2 microexon modulating DAAM1-dependent RHOA/ROCK signaling required for synaptic plasticity and memory [PMID:25897839, PMID:29972794, PMID:40328765]. DAAM1 also drives cancer cell invasion and metastasis through WNT11-FZD7-DAAM1-RhoA-ROCK-Myosin II and integrin-coupled signaling, and additionally restrains integrin surface levels by binding and inhibiting the deubiquitinase USP10 independently of its actin functions [PMID:33082334, PMID:29752407, PMID:37562219].","teleology":[{"year":2001,"claim":"Established DAAM1's founding role: how Wnt/Frizzled signals reach Rho was unknown, and DAAM1 was shown to physically bridge Dishevelled to RhoA, defining the molecular link of the non-canonical Wnt/PCP branch.","evidence":"Reciprocal Co-IP and dominant-negative/depletion experiments in human cells and Xenopus embryos with genetic epistasis","pmids":["11779461"],"confidence":"High","gaps":["Did not resolve how Dvl binding activates DAAM1","No structural basis for the Dvl–DAAM1–RhoA bridge"]},{"year":2007,"claim":"Resolved the activation mechanism: Dvl binding to the DAD domain disrupts intramolecular autoinhibition, showing Dvl acts upstream to convert DAAM1 into an active Rho activator rather than Rho acting as the primary activator.","evidence":"Domain-deletion mutagenesis, Co-IP, and Xenopus convergent extension rescue assays","pmids":["18162551"],"confidence":"High","gaps":["Quantitative kinetics of autoinhibition relief not measured","Interplay between Dvl and Rho/GTP in activation not fully resolved"]},{"year":2007,"claim":"Defined the structural basis of FH2 actin-assembly control: two crystal structures revealed a tethered/ring-shaped dimer with a 'locked' beta-strand conformation occluding the actin-binding surface, identifying an autoinhibited FH2 state whose disruption boosts assembly ~10-fold.","evidence":"X-ray crystallography (2.25 and 2.8 Å) with site-directed mutagenesis and in vitro actin assembly assays","pmids":["17482208","17986009"],"confidence":"High","gaps":["How the locked conformation is released in cells unknown","No structure of full-length autoinhibited DAAM1"]},{"year":2006,"claim":"Identified the first cytoskeletal effectors: Profilin1 was shown to bind the FH1 domain and act downstream of DAAM1 for Wnt-induced stress fibers, and DAAM1 was found to bind GTP-RhoA/Cdc42 and collaborate with Src and CIP4 to remodel protrusions.","evidence":"Co-IP, immunofluorescence, Y2H, GTPase pull-downs, and siRNA knockdown with actin phenotype readouts","pmids":["17021034","16630611"],"confidence":"Medium","gaps":["Direct vs indirect nature of some interactions not all resolved","Role of Cdc42/CIP4 axis in vivo not established"]},{"year":2007,"claim":"Showed DAAM1 has dynamic, stage-specific functions in vivo: during zebrafish convergent extension it first forms an EphB–Dvl2 complex routed into endocytic vesicles to modulate adhesion, then redistributes to actin to drive cell extension.","evidence":"Co-IP, live imaging, dynamin dominant-negative inhibition, and subcellular fractionation in zebrafish","pmids":["17412835"],"confidence":"Medium","gaps":["Molecular trigger for the localization switch unknown","Direct vs indirect EphB association not defined"]},{"year":2010,"claim":"Broadened DAAM1's output beyond actin: a constitutively active C-terminal construct inhibited endothelial proliferation/migration via microtubule stabilization, while DAAM1 localized to myosin IIB stress fibers via its N-terminus and was required for centrosome/Golgi reorientation in polarity.","evidence":"Constitutively active and N-terminal truncation constructs, pharmacological dissection, immunofluorescence, and wound-healing polarity assays","pmids":["20351293","20927366"],"confidence":"Medium","gaps":["Mechanism by which DAAM1 stabilizes microtubules unknown","Link between MT and actin functions of DAAM1 unresolved"]},{"year":2010,"claim":"Identified Flightless-I as a cofactor that enhances DAAM1 FH2 actin-assembly activity and promotes GTP-Rho-mediated relief of autoinhibition, and is required for DAAM1-driven actin assembly in cells.","evidence":"Direct binding assays, in vitro actin assembly assays, and siRNA knockdown with actin readout","pmids":["20223827"],"confidence":"Medium","gaps":["Stoichiometry and structural mode of Fli-I action unknown","Whether Fli-I acts on endogenous DAAM1 complexes in vivo untested"]},{"year":2011,"claim":"Demonstrated a non-redundant in vivo developmental requirement: Daam1-null mice show ventricular noncompaction and septal defects, with DAAM1 needed for cardiomyocyte F-actin assembly through a RhoA/Rac1/Cdc42-independent route.","evidence":"Gene-trap knockout mice, in vivo rescue, cardiomyocyte F-actin assays, and small-GTPase activity assays (negative for RhoA/Rac1/Cdc42)","pmids":["21177343"],"confidence":"High","gaps":["Identity of the GTPase-independent effector pathway in heart unknown","Mechanistic basis of noncompaction not defined"]},{"year":2013,"claim":"Reconstituted a direct actin-bundling partnership: DAAM1 bundles actin along the entire filopodial shaft, and Fascin directly binds and recruits/stabilizes DAAM1 on actin bundles, establishing a cooperative mechanism for filopodia formation.","evidence":"Co-IP, in vitro pull-down with purified proteins, single-molecule TIRF microscopy, and siRNA knockdown with filopodia readout","pmids":["23850281"],"confidence":"High","gaps":["Regulation of DAAM1–Fascin assembly by upstream signals unknown"]},{"year":2015,"claim":"Placed DAAM1 in tissue-specific actin-organizing complexes: it forms an Inturned/NPHP4 ternary complex organizing subapical actin for cilia polarization, and binds Piccolo to direct presynaptic F-actin polymerization at active zones.","evidence":"Co-IP and morpholino/loss-of-function knockdown with subapical and presynaptic F-actin readouts in Xenopus and neurons","pmids":["26644512","25897839"],"confidence":"Medium","gaps":["How these adaptors target/activate DAAM1 mechanistically unclear","Direct vs indirect nature of Piccolo binding not fully defined"]},{"year":2015,"claim":"Refined the cardiac role: DAAM1 and DAAM2 are co-required for sarcomere assembly and myocardial maturation, acting in the Wnt5a pathway with reduced AKT (but unaffected RhoA) activity in double-KO hearts.","evidence":"Conditional and double knockout mice, genetic epistasis with Wnt5a, sarcomere structure and cardiac function analyses","pmids":["26526197"],"confidence":"High","gaps":["Link between DAAM1 and AKT regulation not mechanistically defined","Redundancy boundaries between DAAM1 and DAAM2 incompletely mapped"]},{"year":2016,"claim":"Extended DAAM1's roles in polarity and localization control: it cooperates with Kif26b in the Dvl3 complex for tip-cell polarization via microtubule/MTOC repositioning, maintains lateral-membrane actin to preserve epithelial architecture (with WAVE complex), and its immobilized localization at actin nodes dictates the site of F-actin assembly.","evidence":"Co-IP, rescue experiments, siRNA knockdown, WAVE co-depletion epistasis, photoactivatable tracking, and rapamycin-inducible membrane targeting","pmids":["26792835","27807130","27760153"],"confidence":"Medium","gaps":["What anchors/immobilizes DAAM1 at actin nodes unknown","How DAAM1 coordinates with the antagonistic WAVE pathway unresolved"]},{"year":2018,"claim":"Identified negative regulators and pathogen exploitation: MTSS1 binds the DAAM1 C-terminus and pauses its actin polymerization to control dendritic filopodial length, and the DAAM1 FH2 domain is directly hijacked by Borrelia BBA66 to drive coiling phagocytosis.","evidence":"Single-molecule speckle microscopy, Co-IP, MTSS1 conditional KO, plus Y2H/ELISA/pull-down/Co-IP and functional blocking for BBA66","pmids":["29972794","29746581"],"confidence":"High","gaps":["How MTSS1 inhibition is relieved in vivo unknown","Host signaling triggered by BBA66–DAAM1 during phagocytosis undefined"]},{"year":2018,"claim":"Connected DAAM1 to integrin-driven invasion: type IV collagen activates an integrin αvβ3→DAAM1(DAD)→RhoA axis that drives invadopodia extension, stress-fiber assembly, and haptotaxis in breast cancer cells.","evidence":"IP, GST pull-down, shRNA knockdown, dominant-negative constructs, RhoA activity and haptotaxis assays","pmids":["29752407"],"confidence":"Medium","gaps":["Indirect nature of integrin–DAD association not molecularly resolved","In vivo relevance to tumor invasion not tested here"]},{"year":2019,"claim":"Defined a phosphorylation switch and additional pathway nodes: Src-mediated Tyr652 phosphorylation (opposed by PTPN3) is required for DAAM1 homodimerization and actin polymerization driving cancer migration, while a Daam1/WGEF/Rho branch supports Xenopus pronephric tubulogenesis.","evidence":"Co-IP/pull-down, Src kinase and phosphosite mutagenesis, in vitro actin assays, migration/invasion assays, plus morpholino epistasis in Xenopus/zebrafish","pmids":["31406243","21804089"],"confidence":"High","gaps":["Upstream signals controlling Tyr652 phosphorylation in normal tissue unknown","How phosphorylation couples to autoinhibition release unresolved"]},{"year":2020,"claim":"Revealed a non-formin signaling role and pathway-selectivity function: WNT11-FZD7-DAAM1 drives amoeboid invasion/metastasis via RhoA-ROCK-Myosin II, and Daam1/2 bind the Wnt inhibitor RNF43 to restrain canonical Wnt by promoting Frizzled degradation.","evidence":"Knockdown/dominant-negative with RhoA/Myosin II assays and in vivo metastasis models; Daam1/2 double-KO organoids/mice with RNF43 Co-IP and Wnt reporters","pmids":["33082334","38000028"],"confidence":"Medium","gaps":["Mechanism by which DAAM1/2 promotes RNF43-dependent Fzd turnover unknown","How DAAM1 partitions between canonical and non-canonical Wnt outputs unclear"]},{"year":2021,"claim":"Added partners and adhesion functions: YWHAZ (14-3-3ζ) forms a complex with DAAM1 required for microfilament remodeling and RhoA activation in cancer migration, while FH2-dependent DAAM1 activity organizes junctional F-actin and E-cadherin localization for epithelial adhesion.","evidence":"Co-IP, immunofluorescence, siRNA/overexpression with RhoA assays, miR-613 luciferase reporters, and live imaging with FH2 mutant rescue in nephron/MDCK cells","pmids":["34453038","34233186"],"confidence":"Medium","gaps":["Functional consequence of 14-3-3ζ binding on DAAM1 conformation unknown","How FH2 activity directs E-cadherin localization mechanistically undefined"]},{"year":2023,"claim":"Uncovered an actin-independent regulatory function: the DAAM1 FH2 domain binds and inhibits the deubiquitinase USP10, preventing αv-integrin deubiquitination and limiting integrin surface accumulation, thereby restraining myofibroblast differentiation.","evidence":"Y2H, PLA, Co-IP, in vitro DUB activity assays with the FH2 domain, siRNA knockdown, and integrin ubiquitination assays","pmids":["37562219"],"confidence":"Medium","gaps":["Structural basis for FH2-mediated DUB inhibition unknown","Whether this function is regulated by Wnt/PCP signaling untested"]},{"year":2024,"claim":"Identified RIL (and FNBP1) as new Wnt-responsive partners binding the C-terminal actin-nucleating region of Daam1, with double knockdown producing synergistic Xenopus gastrulation defects, reinforcing DAAM1's scaffolding role in non-canonical Wnt signaling.","evidence":"Co-IP, immunofluorescence, gain/loss-of-function in Xenopus, and genetic epistasis (double-knockdown synergy)","pmids":["38968989"],"confidence":"Medium","gaps":["Molecular function of RIL/FNBP1 on DAAM1 activity unknown","Mammalian relevance of these interactions untested"]},{"year":2025,"claim":"Defined isoform-level tuning of DAAM1 in the brain: a conserved neuronal microexon extending the FH2 linker alters actin polymerization, and its deletion impairs neuritogenesis, synaptic plasticity, and memory through elevated RHOA/ROCK signaling rescuable by ROCK inhibition.","evidence":"CRISPR microexon deletion in mice, in vitro actin assays, LTP electrophysiology, spine/calcium imaging, behavioral tests, and pharmacological ROCK rescue","pmids":["40328765"],"confidence":"High","gaps":["How the microexon biophysically alters FH2 actin output not fully resolved","Tissue/cell-type breadth of microexon-regulated functions unknown"]},{"year":null,"claim":"How DAAM1's multiple regulatory inputs—Dvl-mediated autoinhibition relief, Tyr652 phosphorylation, cofactor binding (Fli-I, Fascin, 14-3-3ζ, MTSS1), and the neuronal microexon—are integrated to select among its actin, microtubule, and non-formin (USP10) outputs in a given cell type remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of full-length regulated DAAM1","Quantitative hierarchy of activating and inhibitory inputs unknown","Determinants of actin- vs microtubule- vs DUB-directed function undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2,3,9,11,17,26,27]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1,19,23]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,16,29]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[28,18]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4,8,11,17]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[15,16,17,26,29]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[17]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[8,16]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,23,24]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,10,14,22,26]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[13,18,30]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[19,23,21]}],"complexes":["Dvl–DAAM1–RhoA complex","Inturned–NPHP4–DAAM1 ternary complex","Dvl3–DAAM1–Kif26b PCP complex"],"partners":["DVL","RHOA","PFN1","FSCN1","MTSS1","YWHAZ","USP10","SRC"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y4D1","full_name":"Disheveled-associated activator of morphogenesis 1","aliases":[],"length_aa":1078,"mass_kda":123.5,"function":"Binds to disheveled (Dvl) and Rho, and mediates Wnt-induced Dvl-Rho complex formation. May play a role as a scaffolding protein to recruit Rho-GDP and Rho-GEF, thereby enhancing Rho-GTP formation. Can direct nucleation and elongation of new actin filaments. Involved in building functional cilia (PubMed:16630611, PubMed:17482208). Involved in the organization of the subapical actin network in multiciliated epithelial cells (By similarity). Together with DAAM2, required for myocardial maturation and sarcomere assembly (By similarity). During cell division, may regulate RHOA activation that signals spindle orientation and chromosomal segregation","subcellular_location":"Cytoplasm; Cytoplasm, cytoskeleton, cilium basal body","url":"https://www.uniprot.org/uniprotkb/Q9Y4D1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DAAM1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DAAM1","total_profiled":1310},"omim":[{"mim_id":"614567","title":"DIAPHANOUS-RELATED FORMIN 3; DIAPH3","url":"https://www.omim.org/entry/614567"},{"mim_id":"613103","title":"SERINE/ARGININE REPETITIVE MATRIX PROTEIN 4; SRRM4","url":"https://www.omim.org/entry/613103"},{"mim_id":"606627","title":"DISHEVELLED-ASSOCIATED ACTIVATOR OF MORPHOGENESIS 2; DAAM2","url":"https://www.omim.org/entry/606627"},{"mim_id":"606626","title":"DISHEVELLED-ASSOCIATED ACTIVATOR OF MORPHOGENESIS 1; DAAM1","url":"https://www.omim.org/entry/606626"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DAAM1"},"hgnc":{"alias_symbol":["KIAA0666"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y4D1","domains":[{"cath_id":"-","chopping":"49-91","consensus_level":"medium","plddt":80.4602,"start":49,"end":91},{"cath_id":"1.20.58.630","chopping":"632-656_681-767","consensus_level":"medium","plddt":89.3484,"start":632,"end":767},{"cath_id":"1.20.58.2220","chopping":"790-989","consensus_level":"high","plddt":94.4604,"start":790,"end":989}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y4D1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y4D1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y4D1-F1-predicted_aligned_error_v6.png","plddt_mean":80.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DAAM1","jax_strain_url":"https://www.jax.org/strain/search?query=DAAM1"},"sequence":{"accession":"Q9Y4D1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y4D1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y4D1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y4D1"}},"corpus_meta":[{"pmid":"11779461","id":"PMC_11779461","title":"Wnt/Frizzled 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Inhibition or depletion of Daam1 prevents Wnt/Fz activation of Rho and blocks Xenopus gastrulation without affecting beta-catenin signaling, placing Daam1 specifically in the non-canonical Wnt/PCP branch.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative/depletion experiments in human cells and Xenopus embryos, genetic epistasis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and functional rescue in two systems (human cells + Xenopus), replicated extensively by subsequent studies\",\n      \"pmids\": [\"11779461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DAAM1 activation is mediated primarily by Dishevelled (Dvl) binding rather than by Rho. Dvl binds to the DAD (diaphanous autoregulatory domain) of DAAM1, disrupting the intramolecular GBD/DID–DAD autoinhibitory interaction. Removal of the DAD or DAD mutations convert DAAM1 into an active protein capable of inducing Rho activation. Thus, Dvl acts upstream of Daam1, which in turn activates RhoA.\",\n      \"method\": \"Domain-deletion mutagenesis, co-immunoprecipitation, Xenopus convergent extension rescue assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis of active site/regulatory domain combined with functional embryo rescue, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"18162551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of the DAAM1 FH2 domain at 2.25 Å resolution reveals a tethered-dimer architecture similar to yeast Bni1 but with a novel 'locked' conformation in which two beta-strands formed by linker ends occlude the actin-binding surfaces. Mutations disrupting this beta-strand lock increase actin assembly activity ~10-fold, indicating this occluded conformation represents an autoinhibited state of the FH2 domain.\",\n      \"method\": \"X-ray crystallography (SAD phasing, 2.25 Å), site-directed mutagenesis, in vitro actin assembly assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis validation and functional actin assembly assay in a single rigorous study\",\n      \"pmids\": [\"17482208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of human DAAM1 FH2 domain at 2.8 Å shows a head-to-tail ring-shaped dimer. Actin assembly assays with DAAM1 mutants demonstrate that the length of the linker connecting the N-terminal domain to the core FH2 region is critical for actin assembly activity.\",\n      \"method\": \"X-ray crystallography, in vitro actin assembly assays with FH2 mutants\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure combined with functional mutagenesis and in vitro actin assembly assay\",\n      \"pmids\": [\"17986009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Profilin1 interacts with the FH1 domain of DAAM1 and co-localizes with DAAM1 on actin stress fibers in response to Wnt signaling. Depletion of Profilin1 inhibits stress fiber formation induced by non-canonical Wnt signaling in mammalian cells, placing Profilin1 as a downstream effector of DAAM1 for cytoskeletal changes.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA knockdown with actin phenotype readout in mammalian cells and Xenopus\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus functional depletion phenotype in two organisms, single lab\",\n      \"pmids\": [\"17021034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DAAM1 binds RhoA and Cdc42 in a GTP-dependent manner and interacts with the SH3 domain of CIP4 (Cdc42 effector). DAAM1 also interacts and collaborates with non-receptor tyrosine kinase Src to induce branched protrusion formation. Ectopic DAAM1 expression induces cell rounding, branched protrusions, and reduction of stress fibers.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, GTPase pull-down assays, cell morphology overexpression experiments\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple Co-IP/pulldown methods and overexpression phenotype, single lab\",\n      \"pmids\": [\"16630611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In zebrafish notochord, DAAM1 dynamically changes subcellular localization during convergent extension: early it forms a complex with EphB receptors and Dishevelled 2 that is incorporated into dynamin-dependent endocytic vesicles, removing EphB from the cell surface to switch cell adhesiveness; later, DAAM1 co-localizes with the actin cytoskeleton to drive cell extension.\",\n      \"method\": \"Co-immunoprecipitation, live imaging, dynamin dominant-negative inhibition, subcellular fractionation in zebrafish\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and live imaging with functional dynamin block, single lab, two orthogonal methods\",\n      \"pmids\": [\"17412835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Constitutively active C-terminal DAAM1 inhibits endothelial cell proliferation and migration by inducing microtubule (MT) stabilization, not solely actin polymerization. MT stabilization alone was sufficient to reproduce the inhibitory effect; actin polymerization inhibition alone (jasplakinolide) was not. This places DAAM1 as a regulator of MT stability in endothelial cells downstream of Wnt/PCP signaling.\",\n      \"method\": \"Expression of constitutively active DAAM1 construct, pharmacological dissection (jasplakinolide, MT stabilizers), endothelial cell proliferation/migration/network formation assays in vitro and in vivo\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection with multiple readouts, single lab\",\n      \"pmids\": [\"20351293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DAAM1 localizes to acto-myosin stress fibers, specifically co-localizing with myosin IIB-containing ventral actin stress fibers. The N-terminal region of DAAM1 (residues 1–440) is responsible for this targeting and interacts with myosin IIB fibers independently of F-actin or RhoA binding. DAAM1 depletion blocks centrosome/Golgi reorientation during wound healing, revealing a role in cell polarity establishment.\",\n      \"method\": \"Specific antibody immunofluorescence, N-terminal truncation constructs, wound-healing polarity assays, DAAM1-stable overexpression lines in U2OS cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping, immunofluorescence co-localization, and functional depletion phenotype, single lab\",\n      \"pmids\": [\"20927366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Flightless-I (Fli-I), a gelsolin family protein, binds directly to DAAM1 and mDia1, enhances their intrinsic actin assembly activity in vitro, and promotes GTP-Rho-mediated relief of DAAM1 autoinhibition. Fli-I is required for DAAM1-induced actin assembly in living cells.\",\n      \"method\": \"Direct binding assays, in vitro actin assembly assay, siRNA knockdown with actin assembly readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution of actin assembly plus cell-based knockdown, single lab, two orthogonal methods\",\n      \"pmids\": [\"20223827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Daam1-deficient mice exhibit ventricular noncompaction, double outlet right ventricles, and septal defects with embryonic/neonatal lethality. Daam1 is required for filamentous actin assembly and organization in cardiomyocytes. Importantly, Daam1-mediated cytoskeletal regulation in the heart does not operate through RhoA, Rac1, or Cdc42.\",\n      \"method\": \"Gene-trap knockout mice, in vivo genetic rescue, F-actin assembly/organization assays in cardiomyocytes, small GTPase activity assays (negative results for RhoA/Rac1/Cdc42)\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous KO mouse model with genetic rescue and biochemical mechanistic dissection, replicated in heart-specific KO\",\n      \"pmids\": [\"21177343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DAAM1 is a potent actin-bundling protein that localizes along the entire filopodial shaft (not only tips). Fascin co-immunoprecipitates with DAAM1 from cell extracts; purified fascin directly binds DAAM1; and single-molecule TIRF imaging shows fascin recruits DAAM1 to and stabilizes DAAM1 on actin bundles in vitro. Silencing fascin causes loss of DAAM1 from filopodial shafts. Together, DAAM1 and fascin directly collaborate in actin bundling required for filopodial formation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro pull-down with purified proteins, single-molecule TIRF microscopy, siRNA knockdown with filopodia morphology readout\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstitution with purified proteins plus single-molecule imaging plus cellular knockdown, multiple orthogonal methods in single study\",\n      \"pmids\": [\"23850281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Inturned acts as an adaptor protein forming a ternary complex with NPHP4 and DAAM1 in multiciliated cells of Xenopus epidermis. Knockdown of daam1 (but not formin-2) disrupts the subapical actin web required for proper cilia polarization and directional fluid flow, placing DAAM1 downstream of Inturned/NPHP4 in organizing the subapical actin network.\",\n      \"method\": \"Co-immunoprecipitation, morpholino knockdown in Xenopus multiciliated cells, immunofluorescence of subapical actin and basal bodies\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating ternary complex plus specific knockdown phenotype, single lab, two orthogonal methods\",\n      \"pmids\": [\"26644512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Piccolo directly binds Daam1 at presynaptic active zones. Daam1 activation promotes Piccolo binding and spatially directs F-actin polymerization at the active zone. Daam1 loss-of-function impairs presynaptic F-actin assembly in neurons, similar to loss of Piccolo or Profilin.\",\n      \"method\": \"Co-immunoprecipitation, protein-protein interaction assays, Daam1 overexpression/knockdown with presynaptic F-actin readout in neurons\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus functional loss-of-function phenotype in neurons, single lab\",\n      \"pmids\": [\"25897839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DAAM1 and DAAM2 are co-required for sarcomere assembly and myocardial maturation. Myocardial-specific Daam1 CKO mice have noncompaction cardiomyopathy and disordered cardiomyocyte polarity; Daam1/Daam2 double KO (DKO) mice show severely disrupted sarcomere structure and reduced cardiac function. Genetic interaction with Wnt5a (Daam1 CKO in Wnt5a-null background worsens phenotype) confirms DAAM1 acts in the Wnt5a pathway. RhoA was unaffected in DKO hearts, but AKT activity was reduced.\",\n      \"method\": \"Conditional knockout mice (floxed allele), Daam1/2 double KO, genetic epistasis with Wnt5a null, sarcomere structure analysis, cardiac function measurements\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models including conditional KO, double KO, and epistasis cross, multiple orthogonal readouts\",\n      \"pmids\": [\"26526197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DAAM1 accumulates at lateral membrane contacts (LCs) of epithelial junctions and regulates the actin filaments there. DAAM1 depletion disperses actin filaments at LCs, enhances LC membrane motility (dependent on the WAVE complex and its downstream targets), and causes invasion of neighboring cell layers, disrupting polarized epithelial architecture.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, live-cell imaging of membrane motility, WAVE complex component co-depletion epistasis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with WAVE complex plus live imaging and knockdown phenotype, single lab\",\n      \"pmids\": [\"27807130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Kif26b (a kinesin) is recruited into the Dvl3/DAAM1 complex. Kif26b and DAAM1 cooperatively regulate endothelial cell tip-cell polarization and directed migration via microtubule stabilization and MTOC/Golgi repositioning. Ectopic Kif26b expression rescues the polarization defect caused by DAAM1 depletion, indicating Kif26b acts downstream of or in parallel to DAAM1 in the Dvl3/DAAM1 PCP complex.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, 3D angiogenesis assay, MTOC/Golgi localization analysis, rescue experiment\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of ternary complex plus functional rescue experiment, single lab\",\n      \"pmids\": [\"26792835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DAAM1 localizes at cytoplasmic actin nodes and is immobilized there (demonstrated by photoactivatable tracking). Forced membrane targeting of DAAM1 via rapamycin-dependent linkage enhances F-actin assembly at the plasma membrane relative to cytoplasm, demonstrating that DAAM1's localization determines the site of actin network assembly during cytoskeletal recovery.\",\n      \"method\": \"Photoactivatable GFP tracking, rapamycin-inducible membrane targeting, Latrunculin A washout actin recovery assay, live-cell imaging\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization tracking with functional consequence shown by chemogenetic membrane targeting, single lab\",\n      \"pmids\": [\"27760153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MTSS1 (inverse-BAR protein) binds to DAAM1 at its C-terminus and pauses DAAM1-mediated F-actin polymerization, as shown by single-molecule speckle microscopy. DAAM1 localizes to the tips of Purkinje cell dendritic filopodia and its overactivation causes excessive contact-induced retraction, phenocopying MTSS1 knockout. MTSS1 thus functions as a formin inhibitor of DAAM1 to control dendritic filopodial length and final neuronal morphology.\",\n      \"method\": \"Single-molecule speckle microscopy of F-actin polymerization, Co-IP, conditional knockout mice (MTSS1), overactivation constructs with dendritic morphology readout\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — single-molecule in vitro reconstitution of actin polymerization plus in vivo KO phenotype, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"29972794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Integrin αvβ3 associates (indirectly) with the C-terminal DAD domain of DAAM1 in breast cancer cells. Type IV collagen activates integrin αvβ3→DAAM1→RhoA signaling to promote invadopodia extension and cell haptotaxis. DAAM1 knockdown or dominant-negative N-DAAM1 abrogates collagen-induced RhoA activity, stress fiber assembly, invadopodia extension, and haptotaxis.\",\n      \"method\": \"Immunoprecipitation, GST pull-down, shRNA knockdown, dominant-negative constructs, RhoA activity assay, Boyden chamber haptotaxis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple biochemical methods (IP and pulldown) plus loss-of-function with defined mechanistic pathway, single lab\",\n      \"pmids\": [\"29752407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DAAM1 FH2 domain directly binds the Borrelia burgdorferi surface lipoprotein BBA66, as demonstrated by yeast two-hybrid, ELISA, pull-down, and co-immunoprecipitation with recombinant proteins. This interaction mediates coiling phagocytosis of B. burgdorferi by human neuroglial cells; BBA66-deficient mutant strains show strongly reduced coiling.\",\n      \"method\": \"Yeast two-hybrid, recombinant protein pull-down, co-immunoprecipitation, ELISA, confocal colocalization, anti-Daam1 antibody blocking\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal binding assays with recombinant proteins plus functional blocking, single lab\",\n      \"pmids\": [\"29746581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PTPN3 (a FERM/PDZ-domain phosphatase) inhibits Src activity and thereby prevents Src-mediated phosphorylation of DAAM1 at Tyr652. Tyr652 phosphorylation of DAAM1 is required for DAAM1 homodimer formation and actin polymerization. A phosphodeficient DAAM1 mutant (Y652F) inhibits F-actin assembly and suppresses lung cancer cell migration and invasion.\",\n      \"method\": \"Protein interaction assays (Co-IP/pulldown), Src kinase assay, phosphorylation site mutagenesis, in vitro actin polymerization assay, cancer cell migration/invasion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — identification of specific phosphorylation site by mutagenesis validated with in vitro actin assay and functional cancer cell phenotype, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"31406243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In the developing Xenopus nephron, DAAM1 functions in pronephric tubulogenesis through a Daam1/WGEF (ArhGEF19)/Rho signaling branch of the Wnt/PCP pathway. Knockdown of Daam1 reduces late pronephric epithelial markers; inhibiting multiple nodes of the Daam1 pathway reduces tubulogenesis without affecting early patterning.\",\n      \"method\": \"Morpholino knockdown in Xenopus and zebrafish, epistasis experiments along the pathway, marker gene expression analysis\",\n      \"journal\": \"Journal of the American Society of Nephrology : JASN\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis across multiple pathway nodes in two model organisms, single lab\",\n      \"pmids\": [\"21804089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WNT11-FZD7-DAAM1 signaling activates Rho-ROCK1/2-Myosin II to drive amoeboid invasion, tumour-initiating potential, and metastasis in melanoma cells. Mechanistically, WNT11 signals through the Frizzled-7 receptor to DAAM1, which then activates the RhoA-ROCK1/2-Myosin II axis.\",\n      \"method\": \"siRNA/shRNA knockdown, dominant-negative constructs, RhoA/Myosin II activity assays, in vivo metastasis models, pathway epistasis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined pathway epistasis and in vivo readout, single study\",\n      \"pmids\": [\"33082334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Daam1/2 double knockout in intestinal cells stimulates canonical Wnt signaling by preventing RNF43-dependent degradation of the Frizzled (Fzd) receptor. Daam1/2 interact with the Wnt inhibitor RNF43. Loss of Daam1/2 thus impairs noncanonical Wnt/PCP signaling and disrupts Paneth cell differentiation, demonstrating that DAAM1 asymmetrically regulates canonical vs. noncanonical Wnt branches.\",\n      \"method\": \"Daam1/2 double knockout organoids/mice, Co-immunoprecipitation of Daam1/2 with RNF43, single-cell RNA sequencing, Wnt reporter assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of DAAM1-RNF43 interaction plus genetic KO with canonical/noncanonical pathway dissection, single lab\",\n      \"pmids\": [\"38000028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"YWHAZ (14-3-3ζ) directly interacts with and co-localizes with DAAM1 in breast cancer cells. This YWHAZ-DAAM1 complex is required for DAAM1-mediated microfilament remodeling and RhoA activation. MiR-613 directly targets both YWHAZ and DAAM1, and blocking the YWHAZ-DAAM1 complex inhibits cell migration.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, siRNA/overexpression experiments, RhoA activity assay, luciferase reporter for miR-613 targeting\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP with functional loss-of-function phenotype, single lab\",\n      \"pmids\": [\"34453038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Daam1 localizes to newly formed cell contacts in the developing nephron, and its depletion decreases junctional F-actin microfilament localization and slows F-actin turnover. The FH2 domain of DAAM1 mediates efficient localization of junctional E-cadherin. Daam1 depletion impairs organized movement of renal cells, demonstrating that Daam1 formin activity is required for E-cadherin-based intercellular adhesion and epithelial organization.\",\n      \"method\": \"Live imaging in Xenopus nephron and MDCK cells, siRNA knockdown, FH2 domain mutant rescue, junctional F-actin and E-cadherin localization assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mutant rescue with live imaging and multiple cellular readouts, single lab\",\n      \"pmids\": [\"34233186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Daam1 interacts with Fascin via its formin homology (FH) domains, specifically the FH2 domain, in breast cancer cells. Co-knockdown of Daam1 or Fascin prevents their co-localization on actin filaments and impairs pseudopodia formation and cell migration, confirming that Daam1-Fascin interaction through FH2 is required for actin filament assembly and cell motility.\",\n      \"method\": \"Co-immunoprecipitation, domain-mapping pulldown (FH1, FH2, DAD constructs), immunofluorescence co-localization, siRNA knockdown with migration assay\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — domain-level binding mapping plus functional knockdown phenotype, single lab\",\n      \"pmids\": [\"33458919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DAAM1 FH2 domain binds to and inhibits the deubiquitinase (DUB) activity of USP10 independently of DAAM1's actin-polymerizing functions. This interaction prevents USP10 from deubiquitinating αv-integrins, thereby suppressing integrin cell surface accumulation. Loss of DAAM1 increases αv-, β1-, β5-integrin levels, recycling, and fibronectin deposition, promoting myofibroblast differentiation.\",\n      \"method\": \"Yeast two-hybrid, proximity ligation assay (PLA), co-immunoprecipitation, DUB activity assay with DAAM1 FH2 domain, siRNA knockdown, integrin ubiquitination assays\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — yeast two-hybrid interaction validated by PLA and Co-IP, with in vitro DUB activity assay using FH2 domain, single lab\",\n      \"pmids\": [\"37562219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RIL (Reversion Induced LIM domain protein) is a new binding partner of Daam1, interacting with the C-terminal actin-nucleating portion of Daam1 in a Wnt-responsive manner. RIL co-localizes with Daam1 at the plasma membrane on actin fibers. Loss of both RIL and Daam1 synergizes to produce severe Xenopus gastrulation defects, indicating they function in the same non-canonical Wnt signaling pathway. RIL also synergizes with another Daam1-interacting protein FNBP1.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, gain/loss-of-function in Xenopus, genetic epistasis (double knockdown synergy)\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with genetic epistasis in two interacting partners, single lab\",\n      \"pmids\": [\"38968989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A conserved neuronal microexon within the DAAM1 FH2 domain (extending the FH2 linker region) alters actin polymerization. Genomic deletion of this microexon in mice causes neuritogenesis defects, increased calcium influx, fewer immature dendritic spines, impaired long-term potentiation, and memory deficits. These phenotypes are associated with increased RHOA/ROCK signaling and are partially rescued by ROCK inhibitor treatment, placing the microexon as a modulator of DAAM1-dependent RHOA/ROCK signaling in neurons.\",\n      \"method\": \"Genomic microexon deletion (CRISPR), in vitro actin polymerization assay, LTP electrophysiology, dendritic spine analysis, calcium imaging, behavioral memory tests, pharmacological ROCK inhibitor rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods including in vitro actin assay, in vivo KO, electrophysiology, pharmacological rescue in a single rigorous study\",\n      \"pmids\": [\"40328765\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DAAM1 is a diaphanous-related formin that functions as a core scaffold in the non-canonical Wnt/PCP pathway: activated by Dishevelled (Dvl) binding to its DAD domain (which relieves autoinhibition rather than Rho binding per se), DAAM1 bridges Dvl to RhoA activation, nucleates and bundles unbranched actin filaments via its FH2 domain (whose activity is modulated by a locked beta-strand conformation and by a neuronal microexon), interacts with Profilin1 (via FH1), Fascin, Flightless-I, MTSS1, YWHAZ, Src-mediated Tyr652 phosphorylation, and USP10, and coordinates cytoskeletal dynamics (actin stress fibers, filopodia, lateral membrane actin, presynaptic F-actin, subapical actin in multiciliated cells) as well as microtubule stabilization, thereby controlling cell polarity, migration, gastrulation, heart morphogenesis/sarcomere assembly, epithelial junction stability, ciliogenesis, phagocytosis, and synaptic plasticity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DAAM1 is a diaphanous-related formin that serves as a core actin-nucleating scaffold in the non-canonical Wnt/planar cell polarity (PCP) pathway, coupling Wnt/Frizzled signaling to Rho-dependent cytoskeletal remodeling [#0]. It acts as a molecular bridge that physically links Dishevelled (Dvl) to RhoA, and Dvl-mediated relief of an intramolecular DAD–DID/GBD autoinhibitory interaction is the principal mode of DAAM1 activation, converting it into a Rho-activating effector [#0, #1]. Once active, DAAM1 nucleates and bundles unbranched actin filaments through its FH2 domain, whose intrinsic assembly activity is gated by a 'locked' beta-strand conformation and by the length of the linker connecting the N-terminal region to the FH2 core [#2, #3]. Productive filament assembly requires cooperating factors: Profilin1 engages the FH1 domain to drive Wnt-induced stress-fiber formation [#4], Flightless-I enhances FH2 actin-assembly activity and aids Rho-dependent activation [#9], and Fascin binds the FH2 domain to recruit and stabilize DAAM1 along filopodial and pseudopodial actin bundles [#11, #27]. DAAM1 activity is further tuned post-translationally, requiring Src-mediated Tyr652 phosphorylation for homodimerization and actin polymerization—an event antagonized by the phosphatase-regulator PTPN3 [#21]. Through these activities DAAM1 organizes diverse actin-based structures and supports microtubule stabilization and MTOC/Golgi reorientation during directed migration and tip-cell polarization [#7, #8, #16]. Physiologically, DAAM1 is essential for vertebrate gastrulation and convergent extension [#0], heart morphogenesis and sarcomere assembly downstream of Wnt5a (independently of RhoA in cardiomyocytes) [#10, #14], epithelial junction stability and E-cadherin-based adhesion [#26], subapical actin organization in multiciliated cells via an Inturned/NPHP4 complex [#12], and presynaptic and dendritic actin remodeling, with a neuronal FH2 microexon modulating DAAM1-dependent RHOA/ROCK signaling required for synaptic plasticity and memory [#13, #18, #30]. DAAM1 also drives cancer cell invasion and metastasis through WNT11-FZD7-DAAM1-RhoA-ROCK-Myosin II and integrin-coupled signaling, and additionally restrains integrin surface levels by binding and inhibiting the deubiquitinase USP10 independently of its actin functions [#23, #19, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established DAAM1's founding role: how Wnt/Frizzled signals reach Rho was unknown, and DAAM1 was shown to physically bridge Dishevelled to RhoA, defining the molecular link of the non-canonical Wnt/PCP branch.\",\n      \"evidence\": \"Reciprocal Co-IP and dominant-negative/depletion experiments in human cells and Xenopus embryos with genetic epistasis\",\n      \"pmids\": [\"11779461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how Dvl binding activates DAAM1\", \"No structural basis for the Dvl–DAAM1–RhoA bridge\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the activation mechanism: Dvl binding to the DAD domain disrupts intramolecular autoinhibition, showing Dvl acts upstream to convert DAAM1 into an active Rho activator rather than Rho acting as the primary activator.\",\n      \"evidence\": \"Domain-deletion mutagenesis, Co-IP, and Xenopus convergent extension rescue assays\",\n      \"pmids\": [\"18162551\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative kinetics of autoinhibition relief not measured\", \"Interplay between Dvl and Rho/GTP in activation not fully resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the structural basis of FH2 actin-assembly control: two crystal structures revealed a tethered/ring-shaped dimer with a 'locked' beta-strand conformation occluding the actin-binding surface, identifying an autoinhibited FH2 state whose disruption boosts assembly ~10-fold.\",\n      \"evidence\": \"X-ray crystallography (2.25 and 2.8 Å) with site-directed mutagenesis and in vitro actin assembly assays\",\n      \"pmids\": [\"17482208\", \"17986009\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the locked conformation is released in cells unknown\", \"No structure of full-length autoinhibited DAAM1\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified the first cytoskeletal effectors: Profilin1 was shown to bind the FH1 domain and act downstream of DAAM1 for Wnt-induced stress fibers, and DAAM1 was found to bind GTP-RhoA/Cdc42 and collaborate with Src and CIP4 to remodel protrusions.\",\n      \"evidence\": \"Co-IP, immunofluorescence, Y2H, GTPase pull-downs, and siRNA knockdown with actin phenotype readouts\",\n      \"pmids\": [\"17021034\", \"16630611\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect nature of some interactions not all resolved\", \"Role of Cdc42/CIP4 axis in vivo not established\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed DAAM1 has dynamic, stage-specific functions in vivo: during zebrafish convergent extension it first forms an EphB–Dvl2 complex routed into endocytic vesicles to modulate adhesion, then redistributes to actin to drive cell extension.\",\n      \"evidence\": \"Co-IP, live imaging, dynamin dominant-negative inhibition, and subcellular fractionation in zebrafish\",\n      \"pmids\": [\"17412835\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular trigger for the localization switch unknown\", \"Direct vs indirect EphB association not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Broadened DAAM1's output beyond actin: a constitutively active C-terminal construct inhibited endothelial proliferation/migration via microtubule stabilization, while DAAM1 localized to myosin IIB stress fibers via its N-terminus and was required for centrosome/Golgi reorientation in polarity.\",\n      \"evidence\": \"Constitutively active and N-terminal truncation constructs, pharmacological dissection, immunofluorescence, and wound-healing polarity assays\",\n      \"pmids\": [\"20351293\", \"20927366\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which DAAM1 stabilizes microtubules unknown\", \"Link between MT and actin functions of DAAM1 unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Flightless-I as a cofactor that enhances DAAM1 FH2 actin-assembly activity and promotes GTP-Rho-mediated relief of autoinhibition, and is required for DAAM1-driven actin assembly in cells.\",\n      \"evidence\": \"Direct binding assays, in vitro actin assembly assays, and siRNA knockdown with actin readout\",\n      \"pmids\": [\"20223827\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and structural mode of Fli-I action unknown\", \"Whether Fli-I acts on endogenous DAAM1 complexes in vivo untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated a non-redundant in vivo developmental requirement: Daam1-null mice show ventricular noncompaction and septal defects, with DAAM1 needed for cardiomyocyte F-actin assembly through a RhoA/Rac1/Cdc42-independent route.\",\n      \"evidence\": \"Gene-trap knockout mice, in vivo rescue, cardiomyocyte F-actin assays, and small-GTPase activity assays (negative for RhoA/Rac1/Cdc42)\",\n      \"pmids\": [\"21177343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the GTPase-independent effector pathway in heart unknown\", \"Mechanistic basis of noncompaction not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Reconstituted a direct actin-bundling partnership: DAAM1 bundles actin along the entire filopodial shaft, and Fascin directly binds and recruits/stabilizes DAAM1 on actin bundles, establishing a cooperative mechanism for filopodia formation.\",\n      \"evidence\": \"Co-IP, in vitro pull-down with purified proteins, single-molecule TIRF microscopy, and siRNA knockdown with filopodia readout\",\n      \"pmids\": [\"23850281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulation of DAAM1–Fascin assembly by upstream signals unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed DAAM1 in tissue-specific actin-organizing complexes: it forms an Inturned/NPHP4 ternary complex organizing subapical actin for cilia polarization, and binds Piccolo to direct presynaptic F-actin polymerization at active zones.\",\n      \"evidence\": \"Co-IP and morpholino/loss-of-function knockdown with subapical and presynaptic F-actin readouts in Xenopus and neurons\",\n      \"pmids\": [\"26644512\", \"25897839\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How these adaptors target/activate DAAM1 mechanistically unclear\", \"Direct vs indirect nature of Piccolo binding not fully defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Refined the cardiac role: DAAM1 and DAAM2 are co-required for sarcomere assembly and myocardial maturation, acting in the Wnt5a pathway with reduced AKT (but unaffected RhoA) activity in double-KO hearts.\",\n      \"evidence\": \"Conditional and double knockout mice, genetic epistasis with Wnt5a, sarcomere structure and cardiac function analyses\",\n      \"pmids\": [\"26526197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Link between DAAM1 and AKT regulation not mechanistically defined\", \"Redundancy boundaries between DAAM1 and DAAM2 incompletely mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended DAAM1's roles in polarity and localization control: it cooperates with Kif26b in the Dvl3 complex for tip-cell polarization via microtubule/MTOC repositioning, maintains lateral-membrane actin to preserve epithelial architecture (with WAVE complex), and its immobilized localization at actin nodes dictates the site of F-actin assembly.\",\n      \"evidence\": \"Co-IP, rescue experiments, siRNA knockdown, WAVE co-depletion epistasis, photoactivatable tracking, and rapamycin-inducible membrane targeting\",\n      \"pmids\": [\"26792835\", \"27807130\", \"27760153\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"What anchors/immobilizes DAAM1 at actin nodes unknown\", \"How DAAM1 coordinates with the antagonistic WAVE pathway unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified negative regulators and pathogen exploitation: MTSS1 binds the DAAM1 C-terminus and pauses its actin polymerization to control dendritic filopodial length, and the DAAM1 FH2 domain is directly hijacked by Borrelia BBA66 to drive coiling phagocytosis.\",\n      \"evidence\": \"Single-molecule speckle microscopy, Co-IP, MTSS1 conditional KO, plus Y2H/ELISA/pull-down/Co-IP and functional blocking for BBA66\",\n      \"pmids\": [\"29972794\", \"29746581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MTSS1 inhibition is relieved in vivo unknown\", \"Host signaling triggered by BBA66–DAAM1 during phagocytosis undefined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected DAAM1 to integrin-driven invasion: type IV collagen activates an integrin αvβ3→DAAM1(DAD)→RhoA axis that drives invadopodia extension, stress-fiber assembly, and haptotaxis in breast cancer cells.\",\n      \"evidence\": \"IP, GST pull-down, shRNA knockdown, dominant-negative constructs, RhoA activity and haptotaxis assays\",\n      \"pmids\": [\"29752407\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Indirect nature of integrin–DAD association not molecularly resolved\", \"In vivo relevance to tumor invasion not tested here\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a phosphorylation switch and additional pathway nodes: Src-mediated Tyr652 phosphorylation (opposed by PTPN3) is required for DAAM1 homodimerization and actin polymerization driving cancer migration, while a Daam1/WGEF/Rho branch supports Xenopus pronephric tubulogenesis.\",\n      \"evidence\": \"Co-IP/pull-down, Src kinase and phosphosite mutagenesis, in vitro actin assays, migration/invasion assays, plus morpholino epistasis in Xenopus/zebrafish\",\n      \"pmids\": [\"31406243\", \"21804089\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals controlling Tyr652 phosphorylation in normal tissue unknown\", \"How phosphorylation couples to autoinhibition release unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed a non-formin signaling role and pathway-selectivity function: WNT11-FZD7-DAAM1 drives amoeboid invasion/metastasis via RhoA-ROCK-Myosin II, and Daam1/2 bind the Wnt inhibitor RNF43 to restrain canonical Wnt by promoting Frizzled degradation.\",\n      \"evidence\": \"Knockdown/dominant-negative with RhoA/Myosin II assays and in vivo metastasis models; Daam1/2 double-KO organoids/mice with RNF43 Co-IP and Wnt reporters\",\n      \"pmids\": [\"33082334\", \"38000028\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which DAAM1/2 promotes RNF43-dependent Fzd turnover unknown\", \"How DAAM1 partitions between canonical and non-canonical Wnt outputs unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Added partners and adhesion functions: YWHAZ (14-3-3ζ) forms a complex with DAAM1 required for microfilament remodeling and RhoA activation in cancer migration, while FH2-dependent DAAM1 activity organizes junctional F-actin and E-cadherin localization for epithelial adhesion.\",\n      \"evidence\": \"Co-IP, immunofluorescence, siRNA/overexpression with RhoA assays, miR-613 luciferase reporters, and live imaging with FH2 mutant rescue in nephron/MDCK cells\",\n      \"pmids\": [\"34453038\", \"34233186\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of 14-3-3ζ binding on DAAM1 conformation unknown\", \"How FH2 activity directs E-cadherin localization mechanistically undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Uncovered an actin-independent regulatory function: the DAAM1 FH2 domain binds and inhibits the deubiquitinase USP10, preventing αv-integrin deubiquitination and limiting integrin surface accumulation, thereby restraining myofibroblast differentiation.\",\n      \"evidence\": \"Y2H, PLA, Co-IP, in vitro DUB activity assays with the FH2 domain, siRNA knockdown, and integrin ubiquitination assays\",\n      \"pmids\": [\"37562219\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis for FH2-mediated DUB inhibition unknown\", \"Whether this function is regulated by Wnt/PCP signaling untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified RIL (and FNBP1) as new Wnt-responsive partners binding the C-terminal actin-nucleating region of Daam1, with double knockdown producing synergistic Xenopus gastrulation defects, reinforcing DAAM1's scaffolding role in non-canonical Wnt signaling.\",\n      \"evidence\": \"Co-IP, immunofluorescence, gain/loss-of-function in Xenopus, and genetic epistasis (double-knockdown synergy)\",\n      \"pmids\": [\"38968989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular function of RIL/FNBP1 on DAAM1 activity unknown\", \"Mammalian relevance of these interactions untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined isoform-level tuning of DAAM1 in the brain: a conserved neuronal microexon extending the FH2 linker alters actin polymerization, and its deletion impairs neuritogenesis, synaptic plasticity, and memory through elevated RHOA/ROCK signaling rescuable by ROCK inhibition.\",\n      \"evidence\": \"CRISPR microexon deletion in mice, in vitro actin assays, LTP electrophysiology, spine/calcium imaging, behavioral tests, and pharmacological ROCK rescue\",\n      \"pmids\": [\"40328765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the microexon biophysically alters FH2 actin output not fully resolved\", \"Tissue/cell-type breadth of microexon-regulated functions unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DAAM1's multiple regulatory inputs—Dvl-mediated autoinhibition relief, Tyr652 phosphorylation, cofactor binding (Fli-I, Fascin, 14-3-3ζ, MTSS1), and the neuronal microexon—are integrated to select among its actin, microtubule, and non-formin (USP10) outputs in a given cell type remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of full-length regulated DAAM1\", \"Quantitative hierarchy of activating and inhibitory inputs unknown\", \"Determinants of actin- vs microtubule- vs DUB-directed function undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2, 3, 9, 11, 17, 26, 27]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1, 19, 23]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 16, 29]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [28, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4, 8, 11, 17]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [15, 16, 17, 26, 29]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [8, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 23, 24]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 10, 14, 22, 26]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [13, 18, 30]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [19, 23, 21]}\n    ],\n    \"complexes\": [\n      \"Dvl–DAAM1–RhoA complex\",\n      \"Inturned–NPHP4–DAAM1 ternary complex\",\n      \"Dvl3–DAAM1–Kif26b PCP complex\"\n    ],\n    \"partners\": [\n      \"DVL\",\n      \"RHOA\",\n      \"PFN1\",\n      \"FSCN1\",\n      \"MTSS1\",\n      \"YWHAZ\",\n      \"USP10\",\n      \"SRC\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}