{"gene":"KANK1","run_date":"2026-06-10T01:55:23","timeline":{"discoveries":[{"year":2016,"finding":"KANK1 directly interacts with the talin rod domain R7 via its conserved KN domain, recruiting cortical microtubule stabilizing complexes (containing CLASPs, KIF21A, LL5β, and liprins) to focal adhesions. A single point mutation in talin that disrupts KANK1 binding (without affecting talin's adhesion function) abrogates association of microtubule-stabilizing complexes with focal adhesions.","method":"Structural studies (crystal structure of KN domain–talin R7), Co-IP, pulldown, single point mutagenesis, live-cell fluorescence microscopy","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus cell biological validation in a single rigorous study, replicated by later structural papers","pmids":["27410476"],"is_preprint":false},{"year":2019,"finding":"The talin R7–KANK1 KN domain complex can withstand physiological shear forces (seconds to minutes, up to ~10 pN). Mechanical force measurements combined with cell biology experiments show that shear-force stretching promotes KANK1 localization to the periphery of focal adhesions, indicating the complex is mechanically regulated.","method":"Single-molecule magnetic tweezer force spectroscopy, immunofluorescence localization in cells","journal":"Nano letters","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct single-molecule mechanical assay with orthogonal cell imaging, single lab but rigorous quantitative method","pmids":["31389241"],"is_preprint":false},{"year":2023,"finding":"Crystal structures of KANK1 in complex with talin and with liprin-β were determined. The KN region of KANK1 contains a novel β-hairpin motif that stabilizes an α-helical region, explaining high-affinity specific binding to talin R7. KANK1 also undergoes liquid-liquid phase separation (LLPS), which is required for its localization at the FA edge and for cytoskeleton connections at focal adhesions.","method":"X-ray crystallography, biochemical assays, LLPS assays, cell biological imaging with structure-guided mutants","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple crystal structures plus LLPS biochemistry plus mutant cell imaging, single lab with orthogonal methods","pmids":["37874676"],"is_preprint":false},{"year":2023,"finding":"Structural determination of the talin–KANK1 complex using a non-covalent crystallographic chaperone revealed that a β-hairpin in the KANK1 KN region stabilizes the helix that binds talin R7. In cells expressing constitutively active vinculin (which maintains FA structure under myosin inhibition), KANK1 localizes throughout the entire FA, indicating that actomyosin tension on talin excludes KANK1 from the FA center, retaining it at the adhesion periphery.","method":"X-ray crystallography, site-directed mutagenesis, live fluorescence microscopy with myosin inhibitors and constitutively active vinculin","journal":"Open biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus mutagenesis plus functional cell imaging with mechanistic perturbations, single lab with multiple orthogonal methods","pmids":["37339751"],"is_preprint":false},{"year":2017,"finding":"Crystal structure of the KANK1 ankyrin repeat domain (ANKRD) in complex with a KIF21A peptide at 2.1 Å resolution revealed that a five-helix-bundle-capping domain immediately preceding the ANK repeats forms a supramodule with the ANK repeats to bind an evolutionarily conserved KIF21A peptide via two distinct interfaces. Mutations at either interface disrupted the interaction and blocked KIF21A recruitment to focal adhesions by KANK1.","method":"X-ray crystallography (2.1 Å), site-directed mutagenesis, co-immunoprecipitation, cellular immunofluorescence localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis and functional cell validation; independently confirmed by two simultaneous structural studies (PMID:29217769, PMID:29183992)","pmids":["29158259"],"is_preprint":false},{"year":2017,"finding":"Crystal structure of the KANK1 ankyrin domain in complex with a ~22 amino acid KIF21A peptide showed that KIF21A is recognized by two distinct pockets of the ankyrin domain and adopts helical conformations upon binding. The same ankyrin domain in KANK2 binds the identical KIF21A peptide in an analogous manner.","method":"X-ray crystallography, site-directed mutagenesis, biochemical binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure replicated independently with mutagenesis, corroborated by PMID:29158259 and PMID:29217769","pmids":["29183992"],"is_preprint":false},{"year":2017,"finding":"Crystal structure of the KANK1 ankyrin repeat domain with KIF21A showed combinatorial use of two interfaces for target binding. Disease-associated missense mutations in KANK1 map to the KANK1–KIF21A interface and destabilize complex formation. Binding-deficient KANK1 mutations block KIF21A recruitment to focal adhesions in cells.","method":"X-ray crystallography, site-directed mutagenesis, immunofluorescence in cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure corroborated by two concurrent structural studies; mutagenesis validated in cells","pmids":["29217769"],"is_preprint":false},{"year":2008,"finding":"KANK1 is an Akt substrate; Akt-mediated phosphorylation of KANK1 enables its interaction with 14-3-3. This phosphorylation-dependent interaction is stimulated by insulin and EGF (PI3K/Akt signaling). KANK1 expression reduces actin stress fibers and inhibits RhoA activation; co-expression of 14-3-3 disrupts this effect. KANK1 also inhibits insulin-induced cell migration through 14-3-3 binding.","method":"In vitro Akt kinase assay, co-immunoprecipitation, overexpression/knockdown in NIH3T3 cells, RhoA activity (GTP-pull-down) assay, cell migration assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay plus reciprocal co-IP plus functional RhoA activity assay, multiple orthogonal methods in single study","pmids":["18458160"],"is_preprint":false},{"year":2009,"finding":"KANK1 binds directly to IRSp53 and specifically inhibits the interaction between IRSp53 and active Rac1 (Rac1-G12V) but not active Cdc42, thereby suppressing IRSp53-dependent lamellipodia formation without affecting filopodia. Knockdown of both KANK1 and IRSp53 phenocopies IRSp53 knockdown, placing KANK1 upstream of IRSp53-Rac1 in the lamellipodia pathway. KANK1 also suppresses insulin-induced membrane ruffling and integrin-dependent cell spreading.","method":"Co-immunoprecipitation/pulldown, RNAi knockdown epistasis, overexpression, lamellipodia/filopodia morphology assays, cell spreading assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with epistasis (double KD) and multiple cell biological readouts, single lab","pmids":["19171758"],"is_preprint":false},{"year":2009,"finding":"KANK1 interacts with the third and fourth coiled-coil domains of KIF21A through its ankyrin repeat domain. The CFEOM1-associated KIF21A mutation R954W (and M947T) enhances interaction with KANK1 and significantly increases translocation of KANK1 to the membrane fraction. Knockdown of KIF21A causes KANK1 to accumulate predominantly in the cytosolic fraction.","method":"Co-immunoprecipitation, subcellular fractionation, siRNA knockdown, Western blotting","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus fractionation with KD and disease mutant, single lab","pmids":["19559006"],"is_preprint":false},{"year":2011,"finding":"KANK1 physically interacts with BIG1 (brefeldin A-inhibited guanine nucleotide-exchange protein 1) by reciprocal immunoprecipitation. Both BIG1 and KANK1 depletion produce strikingly similar defects in directed cell migration and Golgi/MTOC orientation toward the leading edge during wound healing, placing both proteins in overlapping complexes that regulate cell polarity.","method":"Reciprocal co-immunoprecipitation, siRNA depletion, wound-healing migration assay, Golgi/MTOC orientation imaging","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with functional epistasis via siRNA, two orthogonal methods in single lab","pmids":["22084092"],"is_preprint":false},{"year":2006,"finding":"KANK1 shuttles between nucleus and cytoplasm via CRM1-dependent export; active nuclear localization signals (NLS1, NLS2) and nuclear export signals (NES1–NES3) were mapped by mutagenesis. Nuclear KANK1 positively correlates with β-catenin-dependent transcription (TOPFLASH reporter), and KANK1 binds β-catenin and regulates its subcellular distribution.","method":"NLS/NES mutagenesis, leptomycin B treatment, TOPFLASH reporter assay, co-immunoprecipitation, fluorescence microscopy","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis of transport signals plus reporter assay plus Co-IP, multiple methods single lab","pmids":["16968744"],"is_preprint":false},{"year":2015,"finding":"KANK1 (and KANK2, KANK4) localize to podocytes in rat glomeruli, and KANK1 partially colocalizes with synaptopodin. KANK2 interacts with ARHGDIA (a RHO GTPase regulator) in rat glomeruli and cultured human podocytes; knockdown of KANK2 increases active GTP-bound RHOA and decreases podocyte migration, placing KANK proteins upstream of RHO GTPase signaling in podocyte function.","method":"Immunofluorescence localization in rat/human tissue, co-immunoprecipitation, GTP-RhoA pulldown assay, siRNA knockdown, cell migration assay, Drosophila nephrocyte RNAi screen, zebrafish knockdown","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods across multiple model organisms (Drosophila, zebrafish, rat, human cells) with clear functional readout","pmids":["25961457"],"is_preprint":false},{"year":2017,"finding":"KANK1 depletion induces centrosomal amplification and cytokinesis failure (multinucleate/micronuclei cells). KANK1 interacts with Daam1 (a RhoA activator in actin assembly); KANK1 knockdown or Daam1 overexpression each hyperactivate RhoA, leading to dysregulation of Aurora-A activity and centrosomal amplification. KANK1 is also associated with contractile ring formation.","method":"siRNA knockdown, co-immunoprecipitation (KANK1–Daam1), RhoA activity assay, centrosome counting, Aurora-A activity measurement, overexpression","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus RhoA activity assay plus cellular phenotyping, single lab with multiple methods","pmids":["28284839"],"is_preprint":false},{"year":2021,"finding":"TRAIP (an E3 ubiquitin ligase) promotes KANK1 polyubiquitination and subsequent proteasomal degradation in osteosarcoma cells, leading to downregulation of IGFBP3 and activation of the AKT pathway.","method":"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor treatment, Western blotting, overexpression/knockdown in osteosarcoma cells","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay with Co-IP in cells, single lab, moderate mechanistic depth","pmids":["34349117"],"is_preprint":false},{"year":2017,"finding":"Restoration of KANK1 in human MPNST cells inhibits cell growth by increasing apoptosis. RNA-seq identified CXXC5 as a KANK1-regulated downstream gene; knockdown of CXXC5 diminished KANK1-induced apoptosis, placing CXXC5 downstream of KANK1 in the apoptosis pathway.","method":"Stable KANK1 re-expression, xenograft assay, RNA-seq, siRNA knockdown of CXXC5, apoptosis assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq plus functional epistasis (CXXC5 KD rescue) plus in vivo xenograft, single lab","pmids":["28067315"],"is_preprint":false},{"year":2014,"finding":"Drosophila Kank (ortholog of human KANK1) binds EB1 directly; this interaction is essential for Kank localization to microtubule plus ends in cultured cells. In late embryos, Drosophila Kank accumulates at muscle–tendon attachment sites.","method":"Direct binding assay (pulldown), site-directed mutagenesis of EB1-binding motif, live fluorescence imaging in cultured cells and embryos, genetic deletion mutant","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct pulldown binding plus mutagenesis plus localization imaging, single lab","pmids":["25203404"],"is_preprint":false},{"year":2011,"finding":"KANK1-PDGFRβ fusion protein (from t(5;9) translocation) constitutively activates STAT5 and ERK in hematopoietic cells independently of JAK2. The three N-terminal coiled-coil domains of KANK1 are required for KANK1-PDGFRβ-induced cell growth and signaling; the fusion protein forms homotrimeric and higher-order oligomeric complexes via multiple oligomerization domains.","method":"Retroviral transduction of Ba/F3 and CD34+ cells, JAK inhibitor treatment, mutagenesis of coiled-coil domains, size-exclusion chromatography/co-immunoprecipitation, phosphorylation assays","journal":"Haematologica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mutagenesis plus co-IP oligomerization plus pharmacological dissection, single lab","pmids":["21685469"],"is_preprint":false},{"year":2022,"finding":"Depletion of KANK1 in C2C12 myoblasts increases filamentous actin (F-actin) accumulation and promotes nuclear localization of YAP1 by reducing YAP1 phosphorylation, activating YAP1 target genes, accelerating proliferation, and blocking myogenic differentiation. This places KANK1 upstream of F-actin–YAP1 in the mechanotransduction pathway controlling myoblast fate.","method":"siRNA knockdown (siKank1), F-actin staining (phalloidin), YAP1 phosphorylation/localization analysis by Western blot and immunofluorescence, qRT-PCR, myotube formation assay","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with multiple orthogonal readouts (F-actin, YAP1 phosphorylation, differentiation markers), single lab","pmids":["35805114"],"is_preprint":false},{"year":2019,"finding":"KANK1 overexpression in OSCC cells inhibits proliferation and increases apoptosis. YAP overexpression reverses these effects, placing YAP downstream of KANK1 in OSCC growth suppression.","method":"Overexpression, siRNA knockdown, apoptosis assay, mitochondrial membrane potential measurement, in vivo xenograft, rescue by YAP overexpression","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by YAP rescue plus in vivo xenograft, single lab","pmids":["31338836"],"is_preprint":false},{"year":2023,"finding":"In neurons, the KIF21A–KANK1 interaction is critical for dendritic spine morphogenesis and synaptic plasticity. Knockdown of either KIF21A or KANK1 inhibits dendritic spine morphogenesis and dendritic branching; these deficits are rescued by full-length protein but not by binding-deficient mutants (disrupting KIF21A–KANK1 or KANK1–talin1 interaction). In vivo hippocampal KIF21A knockdown impairs LTP amplitude and spatial cognition.","method":"siRNA knockdown with full-length and binding-deficient mutant rescue, confocal imaging of spine morphology, electrophysiology (LTP), rat hippocampal in vivo stereotaxic injection, behavior testing","journal":"Neural regeneration research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with structure-guided mutants in neurons plus in vivo LTP, single lab","pmids":["38767486"],"is_preprint":false},{"year":2025,"finding":"KANK1 is locally enriched at the β-cell capillary interface and its knockdown disrupts subcellular localization of liprin-α1, reduces glucose-induced insulin secretion, and causes mistargeting of insulin granule fusion. KANK1 acts as a component of a complex linking focal adhesion protein talin to liprin-β1, which in turn anchors liprin-α1 through its C-terminus.","method":"siRNA knockdown, immunofluorescence imaging, glucose-stimulated insulin secretion assay, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus knockdown with functional secretion readout and localization imaging, single lab","pmids":["41380968"],"is_preprint":false},{"year":2024,"finding":"In mammary tumor cells, when cells lose basement membrane contact and disassemble integrin adhesions, KANK1 is found at cell-cell junctions where it competes with the polarity protein Scribble for NOS1AP binding, thereby curbing Scribble's ability to promote Hippo pathway activity, leading to TAZ stabilization and nuclear accumulation.","method":"In vivo PyMT mouse tumor model, co-immunoprecipitation, immunofluorescence imaging, Hippo pathway reporter, KANK1 knockout/knockdown","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus in vivo tumor model plus mechanistic signaling assays with multiple orthogonal methods, single lab","pmids":["39613731"],"is_preprint":false},{"year":2024,"finding":"KANK1 haploinsufficiency (achieved via CRISPR/Cas9 genome editing) increases centrosome amplification in a dose-dependent manner; complete KANK1 knockout was not achievable, suggesting essentiality. Rescue with KANK1-expressing plasmid restores normal centrosome numbers. EGR1 knockdown also increases centrosome amplification and reduces KANK1 protein, suggesting a functional link.","method":"CRISPR/Cas9 genome editing, rescue by plasmid expression, centrosome counting, siRNA (EGR1), RNA-seq","journal":"Biochimica et biophysica acta. General subjects","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR editing plus rescue experiment plus RNA-seq, single lab","pmids":["38830559"],"is_preprint":false},{"year":2025,"finding":"The intrinsically disordered linker L2 of KANK1 contains multiple weak LC8-binding motifs; cooperative multivalent binding to the hub protein LC8 converts the disordered L2 into an elongated, rigid, rod-like assembly (~35–50 nm) sufficient to bridge the membrane–microtubule gap at focal adhesions. Isolated single motif peptides do not bind LC8 at physiological concentrations, demonstrating cooperativity is required.","method":"In-cell assays, biochemical binding assays, biophysical assays, AlphaFold-based motif prediction, electron microscopy structural analysis","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — EM structure plus biochemical cooperativity assay plus in-cell validation, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.07.16.665182"],"is_preprint":true},{"year":2020,"finding":"KANK1 localizes to the basal side of epithelial cells in all mouse tissues tested, as determined by subcellular fractionation and immunofluorescence on tissue sections. KANK1 protein localization is distinct from other KANK family members (KANK2 in mesenchymal cells, KANK3 in endothelial cells, KANK4 in smooth muscle/pericytes).","method":"Immunofluorescence on mouse tissue sections, subcellular fractionation, Western blotting","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct immunofluorescence and fractionation across multiple tissues, single lab","pmids":["33253712"],"is_preprint":false},{"year":2002,"finding":"Expression of KANK1 in expression-negative HEK293 cells induced growth retardation at G0/G1 and morphological changes, establishing its function as a growth suppressor. Loss of expression was found due to CpG methylation, with a two-hit mechanism (methylation then deletion).","method":"Stable transfection/re-expression, cell cycle analysis (flow cytometry), RT-PCR, Western blotting, methylation analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional re-expression with cell cycle readout plus epigenetic analysis, single lab foundational study","pmids":["12133830"],"is_preprint":false}],"current_model":"KANK1 is a scaffold adaptor protein that localizes to the periphery of focal adhesions (FAs) by binding directly to the talin rod domain R7 via its KN motif; this interaction is mechanically regulated by actomyosin tension and recruits cortical microtubule-stabilizing complexes (containing KIF21A, CLASPs, LL5β, liprins) to FAs, thereby coordinating actin and microtubule cytoskeletons at cell–ECM adhesion sites. KANK1 also suppresses RhoA activity (through sequestering Daam1 and inhibiting IRSp53–Rac1 interaction), undergoes liquid-liquid phase separation to organize the FA periphery, and acts downstream of PI3K/Akt (which phosphorylates KANK1 to promote 14-3-3 binding and modulate RhoA/cell migration); additionally, KANK1 can compete with Scribble for NOS1AP binding to regulate Hippo/TAZ signaling, and is degraded by the TRAIP ubiquitin ligase to control IGFBP3/AKT signaling."},"narrative":{"mechanistic_narrative":"KANK1 is a scaffold adaptor that couples integrin-based focal adhesions to the microtubule cytoskeleton, organizing the adhesion periphery and tuning Rho-family GTPase signaling, cell migration, and growth control [PMID:27410476, PMID:18458160]. It binds directly to the talin rod domain R7 through its conserved KN motif—an interaction stabilized by a β-hairpin in the KN region—and through this anchor recruits cortical microtubule-stabilizing complexes containing CLASPs, KIF21A, LL5β, and liprins to the adhesion edge [PMID:27410476, PMID:37874676, PMID:37339751]. KANK1 captures KIF21A directly via a supramodule formed by a five-helix-bundle-capping domain and its ankyrin repeats, engaging the KIF21A peptide through two distinct interfaces, and disease-associated missense mutations map to this interface and abolish KIF21A recruitment [PMID:29158259, PMID:29217769]. The talin–KANK1 bond is mechanically regulated: it withstands physiological shear forces, and actomyosin tension on talin excludes KANK1 from the adhesion center, retaining it at the periphery, where KANK1 liquid-liquid phase separation is required for its edge localization and cytoskeletal connectivity [PMID:31389241, PMID:37339751, PMID:37874676]. KANK1 suppresses RhoA activity—by sequestering the RhoA activator Daam1 and by blocking the IRSp53–Rac1 interaction to limit lamellipodia formation—and thereby restrains stress fiber assembly, membrane ruffling, and cell migration [PMID:19171758, PMID:28284839, PMID:18458160]. It functions downstream of PI3K/Akt, which phosphorylates KANK1 to promote 14-3-3 binding and modulate RhoA-dependent migration [PMID:18458160]. Beyond adhesions, KANK1 acts as a growth suppressor: it limits proliferation and promotes apoptosis, restrains YAP/TAZ-dependent transcription, and at cell-cell junctions competes with Scribble for NOS1AP binding to control Hippo signaling [PMID:12133830, PMID:35805114, PMID:39613731]. KANK1 is itself controlled by TRAIP-mediated polyubiquitination and proteasomal degradation, linking it to IGFBP3/AKT signaling [PMID:34349117].","teleology":[{"year":2002,"claim":"Established KANK1 as a growth suppressor whose silencing in cancer follows a two-hit epigenetic/deletion mechanism, motivating study of its cellular function.","evidence":"Re-expression in expression-negative HEK293 cells with cell cycle analysis and methylation profiling","pmids":["12133830"],"confidence":"Medium","gaps":["No molecular mechanism for growth arrest defined","Link between growth suppression and later-defined adhesion/cytoskeletal roles not drawn"]},{"year":2006,"claim":"Showed KANK1 shuttles between nucleus and cytoplasm and influences β-catenin transcription, raising the possibility of a signaling/transcriptional role.","evidence":"NLS/NES mutagenesis, leptomycin B, TOPFLASH reporter, and Co-IP","pmids":["16968744"],"confidence":"Medium","gaps":["Direct vs indirect β-catenin regulation unresolved","Functional consequence in cells not established"]},{"year":2008,"claim":"Defined KANK1 as an Akt substrate whose phosphorylation creates a 14-3-3 binding site, linking PI3K/Akt signaling to RhoA suppression and migration control.","evidence":"In vitro kinase assay, reciprocal Co-IP, RhoA GTP-pulldown, and migration assays in NIH3T3 cells","pmids":["18458160"],"confidence":"High","gaps":["Phosphosite-level mapping and stoichiometry not fully resolved","How 14-3-3 binding mechanistically alters RhoA suppression unclear"]},{"year":2009,"claim":"Identified the molecular basis of RhoA/Rac1 suppression: KANK1 binds IRSp53 to block its interaction with active Rac1, placing KANK1 upstream of lamellipodia formation.","evidence":"Co-IP/pulldown, RNAi epistasis (double knockdown), and lamellipodia/filopodia morphology assays","pmids":["19171758"],"confidence":"High","gaps":["Whether IRSp53 inhibition occurs at adhesions not addressed","Relationship to talin-anchored pool of KANK1 undefined"]},{"year":2009,"claim":"Mapped the KANK1 ankyrin domain–KIF21A coiled-coil interaction and showed a CFEOM1 KIF21A mutation enhances binding and KANK1 membrane translocation, connecting KANK1 to motor regulation.","evidence":"Co-IP, subcellular fractionation, and siRNA in cells with disease mutants","pmids":["19559006"],"confidence":"Medium","gaps":["Structural basis not yet resolved at this stage","Functional output of membrane translocation undefined"]},{"year":2011,"claim":"Linked KANK1 to cell polarity and directed migration via interaction with the GEF BIG1 controlling Golgi/MTOC orientation.","evidence":"Reciprocal Co-IP, siRNA depletion, wound-healing and MTOC orientation imaging","pmids":["22084092"],"confidence":"Medium","gaps":["Direct vs complex-mediated interaction not distinguished","Mechanism connecting BIG1 to MTOC orientation unclear"]},{"year":2011,"claim":"Demonstrated that the KANK1 coiled-coil oligomerization domains drive constitutive kinase activation in the leukemogenic KANK1-PDGFRβ fusion, defining the contribution of KANK1's N-terminal architecture.","evidence":"Retroviral transduction, domain mutagenesis, oligomerization analysis, JAK inhibitor treatment in hematopoietic cells","pmids":["21685469"],"confidence":"Medium","gaps":["Relevance to wild-type KANK1 oligomerization at adhesions unclear","Single fusion-protein context"]},{"year":2015,"claim":"Placed KANK family proteins upstream of RHO GTPase signaling in podocytes across multiple model organisms, linking them to glomerular function.","evidence":"Tissue immunofluorescence, Co-IP, GTP-RhoA pulldown, siRNA, Drosophila and zebrafish knockdown","pmids":["25961457"],"confidence":"High","gaps":["KANK1-specific (vs KANK2) ARHGDIA interaction not fully separated","Direct adhesion role in podocytes not tested here"]},{"year":2016,"claim":"Defined the founding molecular mechanism: KANK1 KN domain binds talin R7 to recruit cortical microtubule-stabilizing complexes to focal adhesions, establishing KANK1 as the actin–microtubule coordinator at adhesions.","evidence":"Crystal structure of KN–talin R7, Co-IP, pulldown, single point mutagenesis, and live-cell imaging","pmids":["27410476"],"confidence":"High","gaps":["Force-dependence of the bond not yet measured","How recruitment is spatially restricted to the periphery unaddressed"]},{"year":2017,"claim":"Resolved the structural basis of KIF21A capture, showing a capping-domain/ankyrin supramodule binds KIF21A through two interfaces and that disease mutations destabilize this complex and block KIF21A recruitment.","evidence":"Multiple independent crystal structures (2.1 Å), mutagenesis, Co-IP, and immunofluorescence","pmids":["29158259","29183992","29217769"],"confidence":"High","gaps":["KANK1 vs KANK2 specificity for KIF21A in vivo not resolved","How motor binding feeds back on microtubule dynamics not quantified"]},{"year":2017,"claim":"Connected KANK1 to mitotic integrity, showing its loss hyperactivates RhoA via Daam1 and causes centrosome amplification and cytokinesis failure.","evidence":"siRNA, KANK1–Daam1 Co-IP, RhoA and Aurora-A activity assays, centrosome counting","pmids":["28284839"],"confidence":"Medium","gaps":["Whether centrosome phenotype derives from the adhesion pool of KANK1 unclear","Direct vs indirect Aurora-A regulation not established"]},{"year":2017,"claim":"Identified CXXC5 as a downstream effector of KANK1-induced apoptosis in malignant peripheral nerve sheath tumor cells, advancing its tumor-suppressive mechanism.","evidence":"Stable re-expression, xenograft, RNA-seq, and CXXC5 knockdown rescue","pmids":["28067315"],"confidence":"Medium","gaps":["How KANK1 controls CXXC5 expression unknown","Link to adhesion/cytoskeletal function not drawn"]},{"year":2019,"claim":"Demonstrated the talin–KANK1 bond is a mechanically robust, force-regulated interaction, explaining tension-dependent peripheral localization.","evidence":"Single-molecule magnetic tweezer force spectroscopy with cell immunofluorescence","pmids":["31389241"],"confidence":"High","gaps":["Force thresholds for in vivo exclusion from FA center not directly measured here","Coupling between force sensing and complex recruitment unresolved"]},{"year":2019,"claim":"Established YAP as a downstream effector of KANK1 growth suppression in oral cancer cells.","evidence":"Overexpression/knockdown, apoptosis and mitochondrial assays, xenograft, YAP rescue","pmids":["31338836"],"confidence":"Medium","gaps":["Mechanism linking KANK1 to YAP regulation not defined here","Single tumor context"]},{"year":2021,"claim":"Identified TRAIP-mediated ubiquitination as a route controlling KANK1 abundance, coupling its degradation to IGFBP3/AKT signaling.","evidence":"Co-IP, ubiquitination assay, proteasome inhibition in osteosarcoma cells","pmids":["34349117"],"confidence":"Medium","gaps":["Ubiquitination site(s) not mapped","Whether degradation alters adhesion-localized KANK1 untested"]},{"year":2022,"claim":"Placed KANK1 upstream of an F-actin–YAP1 mechanotransduction axis controlling myoblast proliferation versus differentiation.","evidence":"siRNA, F-actin staining, YAP1 phosphorylation/localization, differentiation assays in C2C12","pmids":["35805114"],"confidence":"Medium","gaps":["Direct molecular link from KANK1 to F-actin/YAP1 unresolved","Whether talin/RhoA axis mediates the effect untested"]},{"year":2023,"claim":"Showed KANK1 undergoes LLPS required for FA-edge localization and revealed the β-hairpin that confers high-affinity talin R7 binding, and that actomyosin tension excludes KANK1 from the FA center.","evidence":"Multiple crystal structures, LLPS biochemistry, and structure-guided mutant imaging with myosin inhibitors and constitutively active vinculin","pmids":["37874676","37339751"],"confidence":"High","gaps":["Composition and stoichiometry of the phase-separated FA-edge condensate undefined","How LLPS integrates with force sensing unclear"]},{"year":2024,"claim":"Revealed a contact-loss-dependent KANK1 role at cell-cell junctions, where it competes with Scribble for NOS1AP to curb Hippo activity and stabilize TAZ.","evidence":"PyMT in vivo tumor model, reciprocal Co-IP, Hippo reporter, KANK1 knockout/knockdown","pmids":["39613731"],"confidence":"High","gaps":["How adhesion loss redirects KANK1 to junctions mechanistically unclear","Relationship to YAP findings in other tissues not reconciled"]},{"year":2024,"claim":"Provided genetic evidence for KANK1 essentiality and a dose-dependent role suppressing centrosome amplification, with EGR1 as an upstream regulator of KANK1 levels.","evidence":"CRISPR/Cas9 editing (only haploinsufficiency achievable), plasmid rescue, EGR1 knockdown, RNA-seq","pmids":["38830559"],"confidence":"Medium","gaps":["Mechanism by which EGR1 controls KANK1 not defined","Direct vs indirect centrosome regulation unresolved"]},{"year":2024,"claim":"Demonstrated in neurons that the KIF21A–KANK1 (and KANK1–talin1) interactions are required for dendritic spine morphogenesis, synaptic plasticity, and spatial cognition.","evidence":"Knockdown with structure-guided binding-deficient mutant rescue, spine imaging, LTP electrophysiology, and behavior in rat hippocampus","pmids":["38767486"],"confidence":"Medium","gaps":["Subcellular site of KANK1 action in spines undefined","Whether microtubule-stabilizing complex recruitment is the relevant output untested"]},{"year":2025,"claim":"Showed KANK1 organizes a talin–liprin-β1–liprin-α1 complex at the β-cell capillary interface required for proper insulin granule fusion and glucose-stimulated secretion.","evidence":"siRNA, immunofluorescence, glucose-stimulated insulin secretion assay, Co-IP","pmids":["41380968"],"confidence":"Medium","gaps":["Direct KANK1–liprin contacts vs bridging through talin not fully separated","Mechanism linking liprin organization to granule fusion unresolved"]},{"year":2025,"claim":"Proposed a structural mechanism by which KANK1's disordered L2 linker, via cooperative multivalent LC8 binding, forms a rigid rod long enough to bridge the membrane–microtubule gap at adhesions.","evidence":"EM structural analysis, biochemical cooperativity assays, AlphaFold prediction, in-cell assays (preprint)","pmids":["bio_10.1101_2025.07.16.665182"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Functional necessity of the LC8-rigidified rod in cells not fully established"]},{"year":null,"claim":"How KANK1's distinct activities—talin-anchored microtubule coupling, RhoA/Rac1 suppression, LLPS-driven FA-edge organization, and Hippo/YAP–TAZ growth control—are integrated and switched between contexts (adhered vs junctional, mitotic vs interphase) remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model coordinating the adhesion, GTPase, and Hippo functions","Tissue-specific partner usage not systematically mapped","Composition of the FA-edge phase-separated condensate undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,21]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,4,16]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,8,13]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,4,16]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[9,25]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[11]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9,11]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[0,3]},{"term_id":"R-HSA-162582","term_label":"Signal 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At focal adhesions (FAs) rims, organizes cortical microtubule stabilizing complexes (CMSCs) and directly interacts with major FA component TLN1, forming macromolecular assemblies positioned to control microtubule-actin crosstalk at the cell edge (PubMed:24120883, PubMed:27410476). Recruits KIF21A in CMSCs at axonal growth cones and regulates axon guidance by suppressing microtubule growth without inducing microtubule disassembly once it reaches the cell cortex (PubMed:24120883). Interacts with ARFGEF1 and participates in establishing microtubule-organizing center (MTOC) orientation and directed cell movement in wound healing (PubMed:22084092). Regulates actin stress fiber formation and cell migration by inhibiting RHOA activation in response to growth factors; this function involves phosphorylation through PI3K/Akt signaling and may depend on the competitive interaction with 14-3-3 adapter proteins to sequester them from active complexes (PubMed:18458160, PubMed:25961457). Inhibits the formation of lamellipodia but not of filopodia; this function may depend on the competitive interaction with BAIAP2 to block its association with activated RAC1. Inhibits fibronectin-mediated cell spreading; this function is partially mediated by BAIAP2 (PubMed:19171758). In the nucleus, is involved in beta-catenin-dependent activation of transcription (PubMed:16968744). During cell division, may regulate DAAM1-dependent RHOA activation that signals centrosome maturation and chromosomal segregation. May also be involved in contractile ring formation during cytokinesis (By similarity). 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Syndromes","date":"2025-03-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.28.25324850","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":31179,"output_tokens":7001,"usd":0.099276,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16130,"output_tokens":6426,"usd":0.12065,"stage2_stop_reason":"end_turn"},"total_usd":0.219926,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2016,\n      \"finding\": \"KANK1 directly interacts with the talin rod domain R7 via its conserved KN domain, recruiting cortical microtubule stabilizing complexes (containing CLASPs, KIF21A, LL5β, and liprins) to focal adhesions. A single point mutation in talin that disrupts KANK1 binding (without affecting talin's adhesion function) abrogates association of microtubule-stabilizing complexes with focal adhesions.\",\n      \"method\": \"Structural studies (crystal structure of KN domain–talin R7), Co-IP, pulldown, single point mutagenesis, live-cell fluorescence microscopy\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus cell biological validation in a single rigorous study, replicated by later structural papers\",\n      \"pmids\": [\"27410476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The talin R7–KANK1 KN domain complex can withstand physiological shear forces (seconds to minutes, up to ~10 pN). Mechanical force measurements combined with cell biology experiments show that shear-force stretching promotes KANK1 localization to the periphery of focal adhesions, indicating the complex is mechanically regulated.\",\n      \"method\": \"Single-molecule magnetic tweezer force spectroscopy, immunofluorescence localization in cells\",\n      \"journal\": \"Nano letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct single-molecule mechanical assay with orthogonal cell imaging, single lab but rigorous quantitative method\",\n      \"pmids\": [\"31389241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Crystal structures of KANK1 in complex with talin and with liprin-β were determined. The KN region of KANK1 contains a novel β-hairpin motif that stabilizes an α-helical region, explaining high-affinity specific binding to talin R7. KANK1 also undergoes liquid-liquid phase separation (LLPS), which is required for its localization at the FA edge and for cytoskeleton connections at focal adhesions.\",\n      \"method\": \"X-ray crystallography, biochemical assays, LLPS assays, cell biological imaging with structure-guided mutants\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple crystal structures plus LLPS biochemistry plus mutant cell imaging, single lab with orthogonal methods\",\n      \"pmids\": [\"37874676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Structural determination of the talin–KANK1 complex using a non-covalent crystallographic chaperone revealed that a β-hairpin in the KANK1 KN region stabilizes the helix that binds talin R7. In cells expressing constitutively active vinculin (which maintains FA structure under myosin inhibition), KANK1 localizes throughout the entire FA, indicating that actomyosin tension on talin excludes KANK1 from the FA center, retaining it at the adhesion periphery.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, live fluorescence microscopy with myosin inhibitors and constitutively active vinculin\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus mutagenesis plus functional cell imaging with mechanistic perturbations, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37339751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structure of the KANK1 ankyrin repeat domain (ANKRD) in complex with a KIF21A peptide at 2.1 Å resolution revealed that a five-helix-bundle-capping domain immediately preceding the ANK repeats forms a supramodule with the ANK repeats to bind an evolutionarily conserved KIF21A peptide via two distinct interfaces. Mutations at either interface disrupted the interaction and blocked KIF21A recruitment to focal adhesions by KANK1.\",\n      \"method\": \"X-ray crystallography (2.1 Å), site-directed mutagenesis, co-immunoprecipitation, cellular immunofluorescence localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis and functional cell validation; independently confirmed by two simultaneous structural studies (PMID:29217769, PMID:29183992)\",\n      \"pmids\": [\"29158259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structure of the KANK1 ankyrin domain in complex with a ~22 amino acid KIF21A peptide showed that KIF21A is recognized by two distinct pockets of the ankyrin domain and adopts helical conformations upon binding. The same ankyrin domain in KANK2 binds the identical KIF21A peptide in an analogous manner.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, biochemical binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure replicated independently with mutagenesis, corroborated by PMID:29158259 and PMID:29217769\",\n      \"pmids\": [\"29183992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structure of the KANK1 ankyrin repeat domain with KIF21A showed combinatorial use of two interfaces for target binding. Disease-associated missense mutations in KANK1 map to the KANK1–KIF21A interface and destabilize complex formation. Binding-deficient KANK1 mutations block KIF21A recruitment to focal adhesions in cells.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, immunofluorescence in cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure corroborated by two concurrent structural studies; mutagenesis validated in cells\",\n      \"pmids\": [\"29217769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"KANK1 is an Akt substrate; Akt-mediated phosphorylation of KANK1 enables its interaction with 14-3-3. This phosphorylation-dependent interaction is stimulated by insulin and EGF (PI3K/Akt signaling). KANK1 expression reduces actin stress fibers and inhibits RhoA activation; co-expression of 14-3-3 disrupts this effect. KANK1 also inhibits insulin-induced cell migration through 14-3-3 binding.\",\n      \"method\": \"In vitro Akt kinase assay, co-immunoprecipitation, overexpression/knockdown in NIH3T3 cells, RhoA activity (GTP-pull-down) assay, cell migration assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay plus reciprocal co-IP plus functional RhoA activity assay, multiple orthogonal methods in single study\",\n      \"pmids\": [\"18458160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"KANK1 binds directly to IRSp53 and specifically inhibits the interaction between IRSp53 and active Rac1 (Rac1-G12V) but not active Cdc42, thereby suppressing IRSp53-dependent lamellipodia formation without affecting filopodia. Knockdown of both KANK1 and IRSp53 phenocopies IRSp53 knockdown, placing KANK1 upstream of IRSp53-Rac1 in the lamellipodia pathway. KANK1 also suppresses insulin-induced membrane ruffling and integrin-dependent cell spreading.\",\n      \"method\": \"Co-immunoprecipitation/pulldown, RNAi knockdown epistasis, overexpression, lamellipodia/filopodia morphology assays, cell spreading assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with epistasis (double KD) and multiple cell biological readouts, single lab\",\n      \"pmids\": [\"19171758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"KANK1 interacts with the third and fourth coiled-coil domains of KIF21A through its ankyrin repeat domain. The CFEOM1-associated KIF21A mutation R954W (and M947T) enhances interaction with KANK1 and significantly increases translocation of KANK1 to the membrane fraction. Knockdown of KIF21A causes KANK1 to accumulate predominantly in the cytosolic fraction.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, siRNA knockdown, Western blotting\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus fractionation with KD and disease mutant, single lab\",\n      \"pmids\": [\"19559006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"KANK1 physically interacts with BIG1 (brefeldin A-inhibited guanine nucleotide-exchange protein 1) by reciprocal immunoprecipitation. Both BIG1 and KANK1 depletion produce strikingly similar defects in directed cell migration and Golgi/MTOC orientation toward the leading edge during wound healing, placing both proteins in overlapping complexes that regulate cell polarity.\",\n      \"method\": \"Reciprocal co-immunoprecipitation, siRNA depletion, wound-healing migration assay, Golgi/MTOC orientation imaging\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with functional epistasis via siRNA, two orthogonal methods in single lab\",\n      \"pmids\": [\"22084092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"KANK1 shuttles between nucleus and cytoplasm via CRM1-dependent export; active nuclear localization signals (NLS1, NLS2) and nuclear export signals (NES1–NES3) were mapped by mutagenesis. Nuclear KANK1 positively correlates with β-catenin-dependent transcription (TOPFLASH reporter), and KANK1 binds β-catenin and regulates its subcellular distribution.\",\n      \"method\": \"NLS/NES mutagenesis, leptomycin B treatment, TOPFLASH reporter assay, co-immunoprecipitation, fluorescence microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis of transport signals plus reporter assay plus Co-IP, multiple methods single lab\",\n      \"pmids\": [\"16968744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KANK1 (and KANK2, KANK4) localize to podocytes in rat glomeruli, and KANK1 partially colocalizes with synaptopodin. KANK2 interacts with ARHGDIA (a RHO GTPase regulator) in rat glomeruli and cultured human podocytes; knockdown of KANK2 increases active GTP-bound RHOA and decreases podocyte migration, placing KANK proteins upstream of RHO GTPase signaling in podocyte function.\",\n      \"method\": \"Immunofluorescence localization in rat/human tissue, co-immunoprecipitation, GTP-RhoA pulldown assay, siRNA knockdown, cell migration assay, Drosophila nephrocyte RNAi screen, zebrafish knockdown\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods across multiple model organisms (Drosophila, zebrafish, rat, human cells) with clear functional readout\",\n      \"pmids\": [\"25961457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KANK1 depletion induces centrosomal amplification and cytokinesis failure (multinucleate/micronuclei cells). KANK1 interacts with Daam1 (a RhoA activator in actin assembly); KANK1 knockdown or Daam1 overexpression each hyperactivate RhoA, leading to dysregulation of Aurora-A activity and centrosomal amplification. KANK1 is also associated with contractile ring formation.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation (KANK1–Daam1), RhoA activity assay, centrosome counting, Aurora-A activity measurement, overexpression\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus RhoA activity assay plus cellular phenotyping, single lab with multiple methods\",\n      \"pmids\": [\"28284839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRAIP (an E3 ubiquitin ligase) promotes KANK1 polyubiquitination and subsequent proteasomal degradation in osteosarcoma cells, leading to downregulation of IGFBP3 and activation of the AKT pathway.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, proteasome inhibitor treatment, Western blotting, overexpression/knockdown in osteosarcoma cells\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay with Co-IP in cells, single lab, moderate mechanistic depth\",\n      \"pmids\": [\"34349117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Restoration of KANK1 in human MPNST cells inhibits cell growth by increasing apoptosis. RNA-seq identified CXXC5 as a KANK1-regulated downstream gene; knockdown of CXXC5 diminished KANK1-induced apoptosis, placing CXXC5 downstream of KANK1 in the apoptosis pathway.\",\n      \"method\": \"Stable KANK1 re-expression, xenograft assay, RNA-seq, siRNA knockdown of CXXC5, apoptosis assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq plus functional epistasis (CXXC5 KD rescue) plus in vivo xenograft, single lab\",\n      \"pmids\": [\"28067315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Drosophila Kank (ortholog of human KANK1) binds EB1 directly; this interaction is essential for Kank localization to microtubule plus ends in cultured cells. In late embryos, Drosophila Kank accumulates at muscle–tendon attachment sites.\",\n      \"method\": \"Direct binding assay (pulldown), site-directed mutagenesis of EB1-binding motif, live fluorescence imaging in cultured cells and embryos, genetic deletion mutant\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct pulldown binding plus mutagenesis plus localization imaging, single lab\",\n      \"pmids\": [\"25203404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"KANK1-PDGFRβ fusion protein (from t(5;9) translocation) constitutively activates STAT5 and ERK in hematopoietic cells independently of JAK2. The three N-terminal coiled-coil domains of KANK1 are required for KANK1-PDGFRβ-induced cell growth and signaling; the fusion protein forms homotrimeric and higher-order oligomeric complexes via multiple oligomerization domains.\",\n      \"method\": \"Retroviral transduction of Ba/F3 and CD34+ cells, JAK inhibitor treatment, mutagenesis of coiled-coil domains, size-exclusion chromatography/co-immunoprecipitation, phosphorylation assays\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mutagenesis plus co-IP oligomerization plus pharmacological dissection, single lab\",\n      \"pmids\": [\"21685469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Depletion of KANK1 in C2C12 myoblasts increases filamentous actin (F-actin) accumulation and promotes nuclear localization of YAP1 by reducing YAP1 phosphorylation, activating YAP1 target genes, accelerating proliferation, and blocking myogenic differentiation. This places KANK1 upstream of F-actin–YAP1 in the mechanotransduction pathway controlling myoblast fate.\",\n      \"method\": \"siRNA knockdown (siKank1), F-actin staining (phalloidin), YAP1 phosphorylation/localization analysis by Western blot and immunofluorescence, qRT-PCR, myotube formation assay\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with multiple orthogonal readouts (F-actin, YAP1 phosphorylation, differentiation markers), single lab\",\n      \"pmids\": [\"35805114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KANK1 overexpression in OSCC cells inhibits proliferation and increases apoptosis. YAP overexpression reverses these effects, placing YAP downstream of KANK1 in OSCC growth suppression.\",\n      \"method\": \"Overexpression, siRNA knockdown, apoptosis assay, mitochondrial membrane potential measurement, in vivo xenograft, rescue by YAP overexpression\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by YAP rescue plus in vivo xenograft, single lab\",\n      \"pmids\": [\"31338836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In neurons, the KIF21A–KANK1 interaction is critical for dendritic spine morphogenesis and synaptic plasticity. Knockdown of either KIF21A or KANK1 inhibits dendritic spine morphogenesis and dendritic branching; these deficits are rescued by full-length protein but not by binding-deficient mutants (disrupting KIF21A–KANK1 or KANK1–talin1 interaction). In vivo hippocampal KIF21A knockdown impairs LTP amplitude and spatial cognition.\",\n      \"method\": \"siRNA knockdown with full-length and binding-deficient mutant rescue, confocal imaging of spine morphology, electrophysiology (LTP), rat hippocampal in vivo stereotaxic injection, behavior testing\",\n      \"journal\": \"Neural regeneration research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with structure-guided mutants in neurons plus in vivo LTP, single lab\",\n      \"pmids\": [\"38767486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KANK1 is locally enriched at the β-cell capillary interface and its knockdown disrupts subcellular localization of liprin-α1, reduces glucose-induced insulin secretion, and causes mistargeting of insulin granule fusion. KANK1 acts as a component of a complex linking focal adhesion protein talin to liprin-β1, which in turn anchors liprin-α1 through its C-terminus.\",\n      \"method\": \"siRNA knockdown, immunofluorescence imaging, glucose-stimulated insulin secretion assay, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus knockdown with functional secretion readout and localization imaging, single lab\",\n      \"pmids\": [\"41380968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In mammary tumor cells, when cells lose basement membrane contact and disassemble integrin adhesions, KANK1 is found at cell-cell junctions where it competes with the polarity protein Scribble for NOS1AP binding, thereby curbing Scribble's ability to promote Hippo pathway activity, leading to TAZ stabilization and nuclear accumulation.\",\n      \"method\": \"In vivo PyMT mouse tumor model, co-immunoprecipitation, immunofluorescence imaging, Hippo pathway reporter, KANK1 knockout/knockdown\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus in vivo tumor model plus mechanistic signaling assays with multiple orthogonal methods, single lab\",\n      \"pmids\": [\"39613731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KANK1 haploinsufficiency (achieved via CRISPR/Cas9 genome editing) increases centrosome amplification in a dose-dependent manner; complete KANK1 knockout was not achievable, suggesting essentiality. Rescue with KANK1-expressing plasmid restores normal centrosome numbers. EGR1 knockdown also increases centrosome amplification and reduces KANK1 protein, suggesting a functional link.\",\n      \"method\": \"CRISPR/Cas9 genome editing, rescue by plasmid expression, centrosome counting, siRNA (EGR1), RNA-seq\",\n      \"journal\": \"Biochimica et biophysica acta. General subjects\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR editing plus rescue experiment plus RNA-seq, single lab\",\n      \"pmids\": [\"38830559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The intrinsically disordered linker L2 of KANK1 contains multiple weak LC8-binding motifs; cooperative multivalent binding to the hub protein LC8 converts the disordered L2 into an elongated, rigid, rod-like assembly (~35–50 nm) sufficient to bridge the membrane–microtubule gap at focal adhesions. Isolated single motif peptides do not bind LC8 at physiological concentrations, demonstrating cooperativity is required.\",\n      \"method\": \"In-cell assays, biochemical binding assays, biophysical assays, AlphaFold-based motif prediction, electron microscopy structural analysis\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EM structure plus biochemical cooperativity assay plus in-cell validation, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.07.16.665182\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"KANK1 localizes to the basal side of epithelial cells in all mouse tissues tested, as determined by subcellular fractionation and immunofluorescence on tissue sections. KANK1 protein localization is distinct from other KANK family members (KANK2 in mesenchymal cells, KANK3 in endothelial cells, KANK4 in smooth muscle/pericytes).\",\n      \"method\": \"Immunofluorescence on mouse tissue sections, subcellular fractionation, Western blotting\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct immunofluorescence and fractionation across multiple tissues, single lab\",\n      \"pmids\": [\"33253712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Expression of KANK1 in expression-negative HEK293 cells induced growth retardation at G0/G1 and morphological changes, establishing its function as a growth suppressor. Loss of expression was found due to CpG methylation, with a two-hit mechanism (methylation then deletion).\",\n      \"method\": \"Stable transfection/re-expression, cell cycle analysis (flow cytometry), RT-PCR, Western blotting, methylation analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional re-expression with cell cycle readout plus epigenetic analysis, single lab foundational study\",\n      \"pmids\": [\"12133830\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KANK1 is a scaffold adaptor protein that localizes to the periphery of focal adhesions (FAs) by binding directly to the talin rod domain R7 via its KN motif; this interaction is mechanically regulated by actomyosin tension and recruits cortical microtubule-stabilizing complexes (containing KIF21A, CLASPs, LL5β, liprins) to FAs, thereby coordinating actin and microtubule cytoskeletons at cell–ECM adhesion sites. KANK1 also suppresses RhoA activity (through sequestering Daam1 and inhibiting IRSp53–Rac1 interaction), undergoes liquid-liquid phase separation to organize the FA periphery, and acts downstream of PI3K/Akt (which phosphorylates KANK1 to promote 14-3-3 binding and modulate RhoA/cell migration); additionally, KANK1 can compete with Scribble for NOS1AP binding to regulate Hippo/TAZ signaling, and is degraded by the TRAIP ubiquitin ligase to control IGFBP3/AKT signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KANK1 is a scaffold adaptor that couples integrin-based focal adhesions to the microtubule cytoskeleton, organizing the adhesion periphery and tuning Rho-family GTPase signaling, cell migration, and growth control [#0, #7]. It binds directly to the talin rod domain R7 through its conserved KN motif—an interaction stabilized by a β-hairpin in the KN region—and through this anchor recruits cortical microtubule-stabilizing complexes containing CLASPs, KIF21A, LL5β, and liprins to the adhesion edge [#0, #2, #3]. KANK1 captures KIF21A directly via a supramodule formed by a five-helix-bundle-capping domain and its ankyrin repeats, engaging the KIF21A peptide through two distinct interfaces, and disease-associated missense mutations map to this interface and abolish KIF21A recruitment [#4, #6]. The talin–KANK1 bond is mechanically regulated: it withstands physiological shear forces, and actomyosin tension on talin excludes KANK1 from the adhesion center, retaining it at the periphery, where KANK1 liquid-liquid phase separation is required for its edge localization and cytoskeletal connectivity [#1, #3, #2]. KANK1 suppresses RhoA activity—by sequestering the RhoA activator Daam1 and by blocking the IRSp53–Rac1 interaction to limit lamellipodia formation—and thereby restrains stress fiber assembly, membrane ruffling, and cell migration [#8, #13, #7]. It functions downstream of PI3K/Akt, which phosphorylates KANK1 to promote 14-3-3 binding and modulate RhoA-dependent migration [#7]. Beyond adhesions, KANK1 acts as a growth suppressor: it limits proliferation and promotes apoptosis, restrains YAP/TAZ-dependent transcription, and at cell-cell junctions competes with Scribble for NOS1AP binding to control Hippo signaling [#26, #18, #22]. KANK1 is itself controlled by TRAIP-mediated polyubiquitination and proteasomal degradation, linking it to IGFBP3/AKT signaling [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established KANK1 as a growth suppressor whose silencing in cancer follows a two-hit epigenetic/deletion mechanism, motivating study of its cellular function.\",\n      \"evidence\": \"Re-expression in expression-negative HEK293 cells with cell cycle analysis and methylation profiling\",\n      \"pmids\": [\"12133830\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular mechanism for growth arrest defined\", \"Link between growth suppression and later-defined adhesion/cytoskeletal roles not drawn\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed KANK1 shuttles between nucleus and cytoplasm and influences β-catenin transcription, raising the possibility of a signaling/transcriptional role.\",\n      \"evidence\": \"NLS/NES mutagenesis, leptomycin B, TOPFLASH reporter, and Co-IP\",\n      \"pmids\": [\"16968744\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect β-catenin regulation unresolved\", \"Functional consequence in cells not established\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined KANK1 as an Akt substrate whose phosphorylation creates a 14-3-3 binding site, linking PI3K/Akt signaling to RhoA suppression and migration control.\",\n      \"evidence\": \"In vitro kinase assay, reciprocal Co-IP, RhoA GTP-pulldown, and migration assays in NIH3T3 cells\",\n      \"pmids\": [\"18458160\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphosite-level mapping and stoichiometry not fully resolved\", \"How 14-3-3 binding mechanistically alters RhoA suppression unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified the molecular basis of RhoA/Rac1 suppression: KANK1 binds IRSp53 to block its interaction with active Rac1, placing KANK1 upstream of lamellipodia formation.\",\n      \"evidence\": \"Co-IP/pulldown, RNAi epistasis (double knockdown), and lamellipodia/filopodia morphology assays\",\n      \"pmids\": [\"19171758\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IRSp53 inhibition occurs at adhesions not addressed\", \"Relationship to talin-anchored pool of KANK1 undefined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mapped the KANK1 ankyrin domain–KIF21A coiled-coil interaction and showed a CFEOM1 KIF21A mutation enhances binding and KANK1 membrane translocation, connecting KANK1 to motor regulation.\",\n      \"evidence\": \"Co-IP, subcellular fractionation, and siRNA in cells with disease mutants\",\n      \"pmids\": [\"19559006\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis not yet resolved at this stage\", \"Functional output of membrane translocation undefined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked KANK1 to cell polarity and directed migration via interaction with the GEF BIG1 controlling Golgi/MTOC orientation.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA depletion, wound-healing and MTOC orientation imaging\",\n      \"pmids\": [\"22084092\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs complex-mediated interaction not distinguished\", \"Mechanism connecting BIG1 to MTOC orientation unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated that the KANK1 coiled-coil oligomerization domains drive constitutive kinase activation in the leukemogenic KANK1-PDGFRβ fusion, defining the contribution of KANK1's N-terminal architecture.\",\n      \"evidence\": \"Retroviral transduction, domain mutagenesis, oligomerization analysis, JAK inhibitor treatment in hematopoietic cells\",\n      \"pmids\": [\"21685469\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relevance to wild-type KANK1 oligomerization at adhesions unclear\", \"Single fusion-protein context\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed KANK family proteins upstream of RHO GTPase signaling in podocytes across multiple model organisms, linking them to glomerular function.\",\n      \"evidence\": \"Tissue immunofluorescence, Co-IP, GTP-RhoA pulldown, siRNA, Drosophila and zebrafish knockdown\",\n      \"pmids\": [\"25961457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"KANK1-specific (vs KANK2) ARHGDIA interaction not fully separated\", \"Direct adhesion role in podocytes not tested here\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the founding molecular mechanism: KANK1 KN domain binds talin R7 to recruit cortical microtubule-stabilizing complexes to focal adhesions, establishing KANK1 as the actin–microtubule coordinator at adhesions.\",\n      \"evidence\": \"Crystal structure of KN–talin R7, Co-IP, pulldown, single point mutagenesis, and live-cell imaging\",\n      \"pmids\": [\"27410476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Force-dependence of the bond not yet measured\", \"How recruitment is spatially restricted to the periphery unaddressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved the structural basis of KIF21A capture, showing a capping-domain/ankyrin supramodule binds KIF21A through two interfaces and that disease mutations destabilize this complex and block KIF21A recruitment.\",\n      \"evidence\": \"Multiple independent crystal structures (2.1 Å), mutagenesis, Co-IP, and immunofluorescence\",\n      \"pmids\": [\"29158259\", \"29183992\", \"29217769\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"KANK1 vs KANK2 specificity for KIF21A in vivo not resolved\", \"How motor binding feeds back on microtubule dynamics not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected KANK1 to mitotic integrity, showing its loss hyperactivates RhoA via Daam1 and causes centrosome amplification and cytokinesis failure.\",\n      \"evidence\": \"siRNA, KANK1–Daam1 Co-IP, RhoA and Aurora-A activity assays, centrosome counting\",\n      \"pmids\": [\"28284839\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether centrosome phenotype derives from the adhesion pool of KANK1 unclear\", \"Direct vs indirect Aurora-A regulation not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified CXXC5 as a downstream effector of KANK1-induced apoptosis in malignant peripheral nerve sheath tumor cells, advancing its tumor-suppressive mechanism.\",\n      \"evidence\": \"Stable re-expression, xenograft, RNA-seq, and CXXC5 knockdown rescue\",\n      \"pmids\": [\"28067315\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How KANK1 controls CXXC5 expression unknown\", \"Link to adhesion/cytoskeletal function not drawn\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated the talin–KANK1 bond is a mechanically robust, force-regulated interaction, explaining tension-dependent peripheral localization.\",\n      \"evidence\": \"Single-molecule magnetic tweezer force spectroscopy with cell immunofluorescence\",\n      \"pmids\": [\"31389241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Force thresholds for in vivo exclusion from FA center not directly measured here\", \"Coupling between force sensing and complex recruitment unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established YAP as a downstream effector of KANK1 growth suppression in oral cancer cells.\",\n      \"evidence\": \"Overexpression/knockdown, apoptosis and mitochondrial assays, xenograft, YAP rescue\",\n      \"pmids\": [\"31338836\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking KANK1 to YAP regulation not defined here\", \"Single tumor context\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified TRAIP-mediated ubiquitination as a route controlling KANK1 abundance, coupling its degradation to IGFBP3/AKT signaling.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, proteasome inhibition in osteosarcoma cells\",\n      \"pmids\": [\"34349117\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitination site(s) not mapped\", \"Whether degradation alters adhesion-localized KANK1 untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placed KANK1 upstream of an F-actin–YAP1 mechanotransduction axis controlling myoblast proliferation versus differentiation.\",\n      \"evidence\": \"siRNA, F-actin staining, YAP1 phosphorylation/localization, differentiation assays in C2C12\",\n      \"pmids\": [\"35805114\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link from KANK1 to F-actin/YAP1 unresolved\", \"Whether talin/RhoA axis mediates the effect untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed KANK1 undergoes LLPS required for FA-edge localization and revealed the β-hairpin that confers high-affinity talin R7 binding, and that actomyosin tension excludes KANK1 from the FA center.\",\n      \"evidence\": \"Multiple crystal structures, LLPS biochemistry, and structure-guided mutant imaging with myosin inhibitors and constitutively active vinculin\",\n      \"pmids\": [\"37874676\", \"37339751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Composition and stoichiometry of the phase-separated FA-edge condensate undefined\", \"How LLPS integrates with force sensing unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a contact-loss-dependent KANK1 role at cell-cell junctions, where it competes with Scribble for NOS1AP to curb Hippo activity and stabilize TAZ.\",\n      \"evidence\": \"PyMT in vivo tumor model, reciprocal Co-IP, Hippo reporter, KANK1 knockout/knockdown\",\n      \"pmids\": [\"39613731\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How adhesion loss redirects KANK1 to junctions mechanistically unclear\", \"Relationship to YAP findings in other tissues not reconciled\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided genetic evidence for KANK1 essentiality and a dose-dependent role suppressing centrosome amplification, with EGR1 as an upstream regulator of KANK1 levels.\",\n      \"evidence\": \"CRISPR/Cas9 editing (only haploinsufficiency achievable), plasmid rescue, EGR1 knockdown, RNA-seq\",\n      \"pmids\": [\"38830559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which EGR1 controls KANK1 not defined\", \"Direct vs indirect centrosome regulation unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated in neurons that the KIF21A–KANK1 (and KANK1–talin1) interactions are required for dendritic spine morphogenesis, synaptic plasticity, and spatial cognition.\",\n      \"evidence\": \"Knockdown with structure-guided binding-deficient mutant rescue, spine imaging, LTP electrophysiology, and behavior in rat hippocampus\",\n      \"pmids\": [\"38767486\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Subcellular site of KANK1 action in spines undefined\", \"Whether microtubule-stabilizing complex recruitment is the relevant output untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed KANK1 organizes a talin–liprin-β1–liprin-α1 complex at the β-cell capillary interface required for proper insulin granule fusion and glucose-stimulated secretion.\",\n      \"evidence\": \"siRNA, immunofluorescence, glucose-stimulated insulin secretion assay, Co-IP\",\n      \"pmids\": [\"41380968\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct KANK1–liprin contacts vs bridging through talin not fully separated\", \"Mechanism linking liprin organization to granule fusion unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proposed a structural mechanism by which KANK1's disordered L2 linker, via cooperative multivalent LC8 binding, forms a rigid rod long enough to bridge the membrane–microtubule gap at adhesions.\",\n      \"evidence\": \"EM structural analysis, biochemical cooperativity assays, AlphaFold prediction, in-cell assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.07.16.665182\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Functional necessity of the LC8-rigidified rod in cells not fully established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How KANK1's distinct activities—talin-anchored microtubule coupling, RhoA/Rac1 suppression, LLPS-driven FA-edge organization, and Hippo/YAP–TAZ growth control—are integrated and switched between contexts (adhered vs junctional, mitotic vs interphase) remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coordinating the adhesion, GTPase, and Hippo functions\", \"Tissue-specific partner usage not systematically mapped\", \"Composition of the FA-edge phase-separated condensate undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 21]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 4, 16]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 8, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 4, 16]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [9, 25]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 8, 22]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [13, 23]}\n    ],\n    \"complexes\": [\n      \"cortical microtubule-stabilizing complex (CLASP/KIF21A/LL5β/liprin)\",\n      \"talin–KANK1–liprin-β1–liprin-α1 complex\"\n    ],\n    \"partners\": [\n      \"TLN1\",\n      \"KIF21A\",\n      \"Daam1\",\n      \"IRSp53\",\n      \"14-3-3\",\n      \"BIG1\",\n      \"NOS1AP\",\n      \"LC8\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}