{"gene":"LASP1","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1995,"finding":"LASP1 (MLN50/Lasp-1) was identified as the founding member of a new LIM protein subfamily, characterized by an N-terminal LIM motif and a C-terminal SH3 domain, encoded by a 261-residue protein.","method":"cDNA cloning and domain analysis","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — original cloning and domain characterization, foundational paper with 131 citations","pmids":["7589475"],"is_preprint":false},{"year":1996,"finding":"The N-terminal zinc-binding module of the LASP1 LIM domain was resolved by NMR spectroscopy; zinc is coordinated by Cys5, Cys8, His26, and Cys29, establishing the N-terminal half of a LIM domain as an independent folding unit.","method":"1H NMR spectroscopy and energy-refined conformer calculation","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — NMR structure with zinc coordination sites identified by calculation without constraints","pmids":["8841116"],"is_preprint":false},{"year":1998,"finding":"LASP1 contains a functional actin-binding domain in the core of the protein; it binds actin in vivo and in vitro, co-localizes with actin at peripheral cell extensions, and is tyrosine-phosphorylated in Src-transformed fibroblasts.","method":"In vitro actin-binding assay, confocal immunofluorescence, transfection in c-SrcY527F-transformed cells","journal":"Molecular medicine","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro binding assay plus in vivo co-localization and phosphorylation demonstrated","pmids":["9848085"],"is_preprint":false},{"year":1998,"finding":"LASP1 (pp40) is a cAMP-dependent phosphoprotein substrate of PKA in gastric parietal cells; forskolin stimulation produces a higher-molecular-weight phosphorylated form, and the protein contains conserved PKA consensus sequences.","method":"Protein isolation, microsequencing, cDNA cloning, Western blot, Northern blot, forskolin stimulation","journal":"The American journal of physiology","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical isolation, sequencing, and functional phosphorylation demonstrated","pmids":["9688835"],"is_preprint":false},{"year":2000,"finding":"Histamine-induced cAMP elevation in gastric parietal cells increases LASP1 phosphorylation and causes partial redistribution of LASP1 from the cell cortex (where it co-localizes with γ-actin) to the β-actin-enriched intracellular canalicular region, the site of active proton transport.","method":"Immunofluorescence, subcellular fractionation, cAMP stimulation assay in parietal cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiment tied to functional acid secretion response, replicated in multiple epithelial cell types","pmids":["10806114"],"is_preprint":false},{"year":2002,"finding":"LASP1 binds non-muscle F-actin in vitro with Kd ~2 µM (saturation ~1:7); PKA phosphorylation at Ser99 and Ser146 increases the Kd and decreases Bmax, reducing F-actin binding affinity. Alanine substitution at these sites suppresses cAMP-dependent translocation to the intracellular canalicular region in parietal cells.","method":"Actin pull-down assay with bacterially expressed His-tagged LASP1, site-directed mutagenesis, PKA phosphorylation in vitro, parietal cell transfection","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with quantified binding, mutagenesis, and functional localization consequence","pmids":["12432067"],"is_preprint":false},{"year":2004,"finding":"LASP1 localizes to focal complexes and the leading edge of pseudopodia in migratory cells and is required for cell migration (but not adhesion) in response to growth factors and ECM proteins. c-Abl kinase phosphorylates LASP1 at tyrosine 171 upon apoptotic stimulation, causing loss of focal adhesion localization and induction of cell death.","method":"Large-scale proteomic analysis of pseudopodia, siRNA knockdown, immunofluorescence, c-Abl kinase assay, site-directed mutagenesis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — proteomic identification, knockdown with migration phenotype, kinase site mutagenesis; 119 citations","pmids":["15138294"],"is_preprint":false},{"year":2004,"finding":"LASP1 interacts with zyxin via its SH3 domain; the SH3 domain is necessary and sufficient for zyxin binding. The binding site in zyxin is at its extreme N-terminus and does not contain a classical PXXP sequence. LASP1 and zyxin co-localize at focal adhesions.","method":"Co-precipitation, yeast two-hybrid, site-directed mutagenesis of zyxin N-terminus","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — reciprocal binding assays plus mutagenesis mapping binding sites on both partners; 97 citations","pmids":["15004028"],"is_preprint":false},{"year":2004,"finding":"Mouse LASP1 is phosphorylated in intact cells specifically at threonine 156 by PKA and PKG; in vitro PKA/PKG can also phosphorylate Ser61 and Ser99. Forskolin induces translocation of LASP1 from focal contacts to the cell interior. Overlay studies show LASP1 directly binds proline-rich domains of zyxin, LPP, and VASP (zyxin being the most prominent partner); LASP1 exists as a monomer.","method":"In vitro kinase assay, phosphopeptide mapping, immunofluorescence, overlay assay, gel filtration","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro phosphorylation with site identification plus direct binding overlay assays","pmids":["15465019"],"is_preprint":false},{"year":2004,"finding":"LASP1 is a component of CNS postsynaptic densities and is concentrated at synaptic sites and dendritic spines in neurons.","method":"MudPIT proteomic analysis of purified postsynaptic fractions, immunofluorescence","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 2 — proteomic identification plus localization, single lab","pmids":["15372503"],"is_preprint":false},{"year":2006,"finding":"LASP1 silencing in breast cancer cells arrests cells in G2/M phase, reduces proliferation and migration; overexpression in non-tumor PTK-2 cells increases motility. LASP1 knockdown reduces zyxin binding to focal contacts without altering actin stress fibers, whereas zyxin silencing does not affect LASP1 localization, indicating LASP1 is required for recruiting zyxin to focal contacts.","method":"siRNA knockdown, cell cycle analysis, wound-healing assay, immunofluorescence","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 — directional epistasis experiment (LASP1→zyxin localization) plus gain/loss-of-function phenotypes; 106 citations","pmids":["16430883"],"is_preprint":false},{"year":2006,"finding":"The 140 kDa isoform of palladin (but not 90 kDa) directly binds LASP1 via an SH3-domain binding motif, confirmed by yeast two-hybrid and GST pull-down assays. Isoform-specific siRNA experiments show 140 kDa palladin recruits LASP1 to stress fibers.","method":"Yeast two-hybrid, GST pull-down, isoform-specific siRNA, immunofluorescence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — yeast two-hybrid plus GST pull-down plus functional siRNA rescue","pmids":["16492705"],"is_preprint":false},{"year":2007,"finding":"LASP1 is not exclusively cytosolic; it is also detectable in the nucleus of breast cancer cells as confirmed by Western blot of nuclear/cytosolic fractionations and confocal microscopy. Nuclear LASP1 localization correlates with increased tumor size and nodal positivity.","method":"Nuclear/cytosolic fractionation Western blot, confocal immunofluorescence microscopy","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2 — direct fractionation and imaging confirming nuclear localization; single lab","pmids":["17956604"],"is_preprint":false},{"year":2008,"finding":"Targeted disruption of Lasp1 in mice results in enhanced histamine-stimulated HCl secretion in parietal cells, indicating that Lasp1 negatively regulates parietal cell acid secretion, likely by modulating trafficking/activation of the H+,K+-ATPase proton pump through cAMP-dependent phosphorylation-regulated actin interactions.","method":"Lasp1 gene knockout mouse model, in vivo gastric acid secretion measurement, [14C]aminopyrine accumulation in isolated gastric glands","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"High","confidence_rationale":"Tier 2 — genetic knockout with specific quantitative physiological readout, in vivo and ex vivo","pmids":["18483181"],"is_preprint":false},{"year":2008,"finding":"p53 transcriptionally represses LASP1 via a p53 response element in the LASP1 promoter; wild-type p53 (but not DNA-binding mutants) suppresses LASP1 in p53-null cells, while p53 siRNA upregulates LASP1 in p53-expressing cells.","method":"Transient transfection, luciferase reporter assay, siRNA, site-directed mutagenesis of p53 DNA-binding residues","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 1-2 — reporter assay plus reciprocal gain/loss-of-function and mutagenesis","pmids":["19155088"],"is_preprint":false},{"year":2009,"finding":"LASP1 is a downstream effector of urokinase-type plasminogen activator (uPA) in hepatocellular carcinoma; uPA silencing by RNAi reduces LASP1 expression, and ectopic uPA overexpression increases LASP1, with both proteins affecting cell motility. LASP1 depletion disrupts actin microfilament organization.","method":"2D-DIGE proteomics, MALDI-TOF-MS identification, Western blot, immunofluorescence, siRNA knockdown","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 — proteomic identification confirmed by Western blot and functional assays, single lab","pmids":["19177205"],"is_preprint":false},{"year":2009,"finding":"Kelch-related protein 1 (Krp1) directly interacts with LASP1 in membrane ruffles at the tips of pseudopodia; two specific binding sites on Krp1 (amino acids 317-327 and 563-574) are brought into proximity by a novel six-bladed β-propeller structure. Both sites are necessary for Krp1-LASP1 interaction in vitro and for pseudopodial elongation in vivo.","method":"Peptide array probing with recombinant LASP1, mutational analysis, crystal structure of Krp1 C-terminal domain, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus mutational validation plus functional in vivo consequence","pmids":["19726686"],"is_preprint":false},{"year":2009,"finding":"Src kinase phosphorylates LASP1 at tyrosine 171 in thrombin-stimulated platelets; fibrinogen-mediated integrin αIIbβ3 activation triggers this phosphorylation, which promotes LASP1 translocation from cytosol to focal contacts and leading lamellae, indicating a role in platelet cytoskeleton rearrangement.","method":"Src-specific inhibitors, site-directed mutagenesis (Y171), immunofluorescence of adherent platelets and CHO cell model","journal":"Thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis identifies site, pharmacological and cell biological validation in two models","pmids":["19718473"],"is_preprint":false},{"year":2012,"finding":"LASP1 nuclear import is regulated by PKA-dependent phosphorylation at serine 146, which induces translocation of the LASP1/ZO-2 complex from cytoplasm to nucleus. Interaction occurs between the C-terminal proline-rich motif of ZO-2 and the SH3 domain of LASP1. Nuclear export is mediated by CRM1 and a newly identified nuclear export signal in LASP1. Dephosphorylation by PP2B relocalizes LASP1 back to focal contacts.","method":"Co-IP, in situ proximity ligation assay, nuclear/cytosolic fractionation, CRM1 inhibitor (leptomycin B), phosphomimetic/phospho-dead mutants","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods identifying mechanism of nuclear shuttling including writer (PKA), eraser (PP2B), and carrier (ZO-2/CRM1)","pmids":["22665060"],"is_preprint":false},{"year":2012,"finding":"LASP1 is a novel component of podosomes, localizing to the podosome ring structure (co-localizing with zyxin and vinculin), and is recruited during early podosome assembly. LASP1 knockdown in human macrophages impairs podosome dynamics and matrix degradation capacity.","method":"Immunofluorescence, live cell imaging, siRNA knockdown, matrix degradation assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — live imaging of recruitment plus loss-of-function with specific functional readout","pmids":["22514729"],"is_preprint":false},{"year":2014,"finding":"LASP1 is a direct substrate of BCR-ABL oncogenic kinase in CML; BCR-ABL specifically phosphorylates LASP1 at tyrosine 171, which is abolished by tyrosine kinase inhibitor therapy. Phospho-LASP1-Y171 binds to non-phosphorylated CRKL at its SH2 domain, disrupting normal CRKL regulation.","method":"Phosphoproteomic mass spectrometry, in vitro kinase assay, co-IP, tyrosine kinase inhibitor treatment of CML patients","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 1-2 — kinase assay plus patient samples plus defined binding interaction with phospho-dependency","pmids":["24913448"],"is_preprint":false},{"year":2014,"finding":"LASP1 overexpression in pancreatic ductal adenocarcinoma is mediated by HIF1α, which directly binds a hypoxia response element in the LASP1 promoter, promoting LASP1 expression in vitro and in mouse xenografts.","method":"ChIP assay, luciferase reporter assay, HIF1α knockdown/overexpression, xenograft tumor model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP demonstrates direct HIF1α binding, reporter validates functional element, in vivo confirmation","pmids":["25385028"],"is_preprint":false},{"year":2015,"finding":"Nuclear LASP1 acts as a hub for an epigenetic complex comprising UHRF1, DNMT1, G9a, and the transcription factor Snail1. CXCL12-activated CXCR4 signaling drives nuclear translocation of LASP1, which then associates with UHRF1, G9a, Snail1, and di/tri-methylated histone H3 in a CXCL12-dependent manner. LASP1 directly binds Snail1, potentially stabilizing it.","method":"Proteomic analysis of LASP1 immunoprecipitates, co-IP, proximity ligation assay, CXCR4 antagonist AMD-3100, 3D Matrigel culture","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — proteomics plus co-IP plus PLA with chemokine-dependent control; multiple orthogonal methods","pmids":["25982273"],"is_preprint":false},{"year":2016,"finding":"LASP1 interacts with S100A11 and enhances its expression, driving TGFβ-mediated epithelial-mesenchymal transition in colorectal cancer. LASP1-S100A11 axis operates through downstream effectors flotillin-1 (cytoplasmic) and histone H1 (nuclear).","method":"Co-IP, subcellular fractionation, siRNA knockdown, xenograft assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP plus in vivo validation, single lab","pmids":["27181092"],"is_preprint":false},{"year":2016,"finding":"LASP1 regulates expression and secretion of MMP1, MMP3, and MMP9 in invasive breast cancer cells. LASP1 depletion reduces AP-1 transcriptional activity, which controls MMP expression. LASP1 also promotes MMP secretion into the extracellular matrix.","method":"Microarray analysis, Western blot, luciferase reporter assay for AP-1 activity, zymography, rescue experiments","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay plus zymography plus rescue; single lab","pmids":["27588391"],"is_preprint":false},{"year":2017,"finding":"LASP1 directly interacts with FAK and facilitates phosphorylation of FAK at Tyr397, which in turn promotes AKT phosphorylation at Ser473, promoting non-small cell lung cancer proliferation and invasion. FAK inhibition abolishes AKT phosphorylation but not vice versa, placing FAK upstream of AKT in the LASP1 pathway.","method":"Co-IP, Western blot with phospho-specific antibodies, FAK/AKT inhibitors, epistasis by sequential inhibitor treatment","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP plus pharmacological epistasis, single lab","pmids":["29088849"],"is_preprint":false},{"year":2017,"finding":"LASP1 is transcriptionally activated by the transcription factor SOX9, which binds a consensus site in the LASP1 promoter, as demonstrated by luciferase reporter and ChIP assays. SOX9 knockdown phenocopies LASP1 knockdown effects on lung cancer cell proliferation and apoptosis.","method":"Luciferase reporter assay, ChIP assay, siRNA knockdown of SOX9 and LASP1","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 1-2 — ChIP plus reporter assay confirming direct transcriptional regulation; single lab","pmids":["29138807"],"is_preprint":false},{"year":2019,"finding":"LASP1 interacts with components of the eIF4F translation initiation complex (eIF4A and eIF4B) in a CXCL12-dependent manner. LASP1 directly binds eIF4A and eIF4B (demonstrated by GST pull-down). Genetic silencing of LASP1 impairs eIF4A-dependent translation of oncogenic mRNAs (including BIRC5), and reduces sensitivity to Rocaglamide A.","method":"Proteomic screen, proximity ligation assay, co-IP, GST pull-down, 5'UTR luciferase reporter assay","journal":"Frontiers in oncology","confidence":"High","confidence_rationale":"Tier 1-2 — GST pull-down plus PLA plus co-IP plus functional translation reporter; multiple orthogonal methods","pmids":["31106142"],"is_preprint":false},{"year":2019,"finding":"LASP1 interacts with PTEN, promotes PTEN ubiquitination and degradation, thereby activating the PI3K/AKT signaling pathway in nasopharyngeal carcinoma. LASP1 and PTEN co-localize in NPC cells.","method":"Co-IP, ubiquitination assay, immunofluorescence co-localization, rescue experiments with PTEN overexpression","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP plus ubiquitination assay plus functional rescue; single lab","pmids":["29531214"],"is_preprint":false},{"year":2019,"finding":"HBx upregulates LASP1 transcription through activation of c-Jun (AP-1) via the PI3K/JNK signaling pathway. HBx interacts with phosphorylated c-Jun in HCC cells, and ChIP assay demonstrates HBx binds to the LASP1 promoter together with c-Jun. The N-terminus of HBx is responsible for c-Jun activation.","method":"Luciferase reporter assay, ChIP assay, co-IP, PI3K/JNK inhibitors, N-terminal deletion constructs of HBx","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 1-2 — ChIP plus reporter assay plus co-IP; single lab","pmids":["29600594"],"is_preprint":false},{"year":2020,"finding":"LASP1 interacts with N-WASP (identified by yeast two-hybrid screen); N-WASP activates the Arp2/3 complex to stimulate actin polymerization, promoting CRC cell migration and invasion. LASP1 interaction with N-WASP does not alter N-WASP expression but rescues Arp2/3-dependent actin polymerization when N-WASP is silenced.","method":"Yeast two-hybrid screen, co-IP, actin polymerization assay, in vivo xenograft models","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 — yeast two-hybrid discovery plus co-IP validation plus reconstituted actin polymerization assay","pmids":["32704133"],"is_preprint":false},{"year":2020,"finding":"CXCR4-activated LASP1 associates with Argonaute 2 (Ago2) in a CXCL12-dependent manner. LASP1 directly binds Ago2 through its LIM and SH3 domains (GST pull-down). Phosphorylation at S146 and Y171 of LASP1 dictates this binding. The LASP1-Ago2 interaction modulates Let-7a-guided RNAi activity and affects levels of Let-7a targets including CCR7.","method":"Co-IP, proximity ligation assay, GST pull-down, phospho-dead/phosphomimetic mutants, CXCR4 antagonist AMD3465, Let-7a target expression analysis","journal":"Cancers","confidence":"High","confidence_rationale":"Tier 1-2 — GST pull-down plus co-IP plus PLA plus phospho-mutant dissection; multiple orthogonal methods","pmids":["32872485"],"is_preprint":false},{"year":2020,"finding":"Nuclear LASP1, driven by CXCR4 activation, stabilizes nuclear Snail1 by upregulating nuclear pS473-Akt, pS9-GSK-3β, A20, and LSD1, and directly associating with Snail1, A20, GSK-3β, and LSD1. LASP1 ablation mislocalizes Snail1 and impairs Matrigel invasion.","method":"Co-IP of endogenous proteins, proximity ligation assay, CXCR4 antagonist, nuclear fractionation Western blot, Matrigel invasion assay","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus PLA plus nuclear fractionation; single lab","pmids":["32825729"],"is_preprint":false},{"year":2021,"finding":"LASP1 functions as a binding partner of the Cadherin-11/β-Catenin complex at zipper-like cell-to-cell contacts in fibroblast-like synoviocytes. Loss or blocking of LASP1 alters pathological tissue formation, migratory behavior, and PDGF response of arthritic FLS. Deletion of Lasp1 in human TNF transgenic mice reduces arthritic joint destruction.","method":"Integrative epigenomic profiling, co-IP, siRNA/antibody blocking, PDGF response assay, Lasp1 knockout in TNF-transgenic arthritis mouse model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — epigenomics plus co-IP plus in vivo knockout phenotype in disease model","pmids":["34131132"],"is_preprint":false},{"year":2021,"finding":"METTL14 improves LASP1 mRNA stability through m6A modification, thereby activating the LASP1/SRC/AKT signaling axis and promoting fibroblast-like synoviocyte activation in rheumatoid arthritis. LASP1 overexpression reverses the effects of METTL14 knockdown on FLS migration, invasion, and cytokine production.","method":"shRNA knockdown of METTL14, Western blot for LASP1/p-SRC/p-AKT, rescue experiments with LASP1 overexpression, RA rat model","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional epistasis (METTL14→m6A→LASP1) with rescue, single lab","pmids":["36878846"],"is_preprint":false},{"year":2022,"finding":"HBX promotes LASP1 SUMOylation via RANBP2 and RANGAP1 (which interact with LASP1), increasing LASP1 SUMOylation to stabilize HER2 by preventing its ubiquitination-mediated proteasomal degradation, thereby activating insulin signaling and enhancing HCC cell growth and migration.","method":"Co-IP, ubiquitination assay, SUMOylation assay, LASP1/HER2 interaction analysis, identification of RANBP2/RANGAP1 as LASP1 interactors","journal":"International journal of biological macromolecules","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP plus ubiquitination/SUMOylation assays; mechanistic chain established but single lab","pmids":["36473530"],"is_preprint":false},{"year":2023,"finding":"TRIM15 mediates K63-linked polyubiquitination of LASP1, which promotes LASP1 nuclear translocation in hepatocellular carcinoma, increasing AKT phosphorylation and Snail expression to confer TKI resistance. This is regulated by the AKT/FOXO1 axis controlling TRIM15 expression.","method":"Co-IP, ubiquitination assay (K63 linkage-specific), Western blot for nuclear fractionation, FOXO1/AKT pathway analysis, TKI resistance assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2-3 — ubiquitination assay with linkage specificity plus nuclear fractionation plus functional TKI resistance readout; single lab","pmids":["36670097"],"is_preprint":false},{"year":2017,"finding":"LASP1 expression is negatively regulated by androgen receptor (AR) at the transcriptional level in prostate cancer; AR suppression elevates LASP1, while AR activation decreases it. LASP1 promotes cell cycle progression through cyclin D1 upregulation, and in vivo antisense oligonucleotide knockdown of LASP1 inhibits CRPC xenograft tumor growth.","method":"TMA analysis after hormone deprivation, AR gain/loss-of-function, cyclin D1 Western blot, cell cycle flow cytometry, in vivo ASO treatment of xenografts","journal":"The Prostate","confidence":"Medium","confidence_rationale":"Tier 2 — AR manipulation plus in vivo ASO experiment; single lab","pmids":["27775154"],"is_preprint":false}],"current_model":"LASP1 is a multidomain actin-binding scaffold protein (LIM domain, two nebulin repeats, SH3 domain) that dynamically localizes to focal adhesions, podosomes, lamellipodia, and the nucleus; its subcellular distribution and interactions are regulated by phosphorylation (PKA at S146, Src/BCR-ABL at Y171, PKG at T156) and SUMOylation/ubiquitination, with S146 phosphorylation driving ZO-2-dependent nuclear import via CRM1-mediated export, nuclear LASP1 acting as a hub for the UHRF1/DNMT1/G9a/Snail1 epigenetic complex and interacting with Ago2 to modulate RNAi, cytoplasmic LASP1 promoting cell migration through direct binding to F-actin, zyxin, palladin-140kDa, N-WASP/Arp2/3, Krp1, and FAK, and regulation of MMP transcription via AP-1, while also interacting with PTEN (promoting its ubiquitination/degradation to activate PI3K/AKT), HER2, and eIF4F complex components to enhance oncogenic mRNA translation."},"narrative":{"teleology":[{"year":1995,"claim":"Identification of LASP1 as the founding member of a novel LIM-SH3 protein subfamily established its unique domain architecture and predicted dual scaffolding capability.","evidence":"cDNA cloning and domain analysis from breast cancer overexpression screen","pmids":["7589475"],"confidence":"High","gaps":["No function assigned beyond domain prediction","Binding partners unknown","Subcellular localization not determined"]},{"year":1998,"claim":"Demonstrating that LASP1 directly binds F-actin in vitro and co-localizes with actin at cell extensions, while undergoing Src-dependent tyrosine phosphorylation, established it as a regulated actin-associated protein rather than a purely transcriptional LIM factor.","evidence":"In vitro actin-binding assay, confocal microscopy, c-Src-transformed fibroblasts","pmids":["9848085","9688835"],"confidence":"High","gaps":["Actin-binding domain not mapped to specific residues","Functional consequence of Src phosphorylation undefined","Role in cell motility not yet tested"]},{"year":2002,"claim":"Quantitative binding studies showed PKA phosphorylation at Ser99/Ser146 reduces F-actin affinity, and mutagenesis linked these sites to cAMP-dependent intracellular translocation, revealing phosphorylation as a molecular switch controlling LASP1 subcellular distribution.","evidence":"Actin pull-down with His-tagged wild-type and phosphomimetic LASP1, PKA in vitro phosphorylation, parietal cell transfection","pmids":["12432067"],"confidence":"High","gaps":["Nuclear translocation not yet recognized","Identity of the phosphatase reversing the switch unknown","Downstream effectors of translocation uncharacterized"]},{"year":2004,"claim":"Multiple studies converged to show LASP1 is required for cell migration (not adhesion), localizes to focal complexes and pseudopodia tips, interacts with zyxin via its SH3 domain, and is phosphorylated at Tyr171 by c-Abl upon apoptotic stimuli — establishing it as a migration-promoting scaffold regulated by multiple kinases.","evidence":"siRNA knockdown with migration assay, yeast two-hybrid and co-precipitation for zyxin, c-Abl kinase assay with Y171 mutagenesis, phosphopeptide mapping","pmids":["15138294","15004028","15465019"],"confidence":"High","gaps":["Mechanism by which LASP1 promotes migration beyond zyxin recruitment unclear","Whether Y171 and S146 phosphorylation are coordinated unknown","In vivo genetic validation lacking"]},{"year":2006,"claim":"Epistasis experiments showed LASP1 knockdown displaces zyxin from focal contacts without reciprocal dependency, and 140-kDa palladin recruits LASP1 to stress fibers via an SH3-binding motif, establishing a hierarchical scaffold network at adhesion sites.","evidence":"Reciprocal siRNA of LASP1 and zyxin with immunofluorescence; yeast two-hybrid and isoform-specific siRNA for palladin","pmids":["16430883","16492705"],"confidence":"High","gaps":["Whether palladin and zyxin interactions are simultaneous or competitive unknown","Structural basis of non-canonical SH3 binding not resolved"]},{"year":2008,"claim":"Lasp1 knockout mice exhibited enhanced gastric acid secretion, providing the first in vivo genetic evidence that LASP1 negatively regulates H+,K+-ATPase trafficking in parietal cells through its actin-regulatory function.","evidence":"Lasp1 gene knockout mouse, in vivo gastric acid measurement, aminopyrine accumulation in isolated glands","pmids":["18483181"],"confidence":"High","gaps":["Mechanism of H+,K+-ATPase trafficking regulation not molecularly resolved","Whether other organ systems are affected in knockout not systematically characterized"]},{"year":2009,"claim":"Src phosphorylation at Y171 was shown to drive LASP1 translocation to focal contacts in thrombin-stimulated platelets downstream of integrin αIIbβ3, while Krp1 crystal structure revealed a β-propeller presenting two LASP1-binding sites required for pseudopodial elongation — broadening LASP1's role beyond epithelial cells.","evidence":"Src inhibitors and Y171 mutagenesis in platelets; crystal structure of Krp1 C-terminal domain plus peptide array mapping","pmids":["19718473","19726686"],"confidence":"High","gaps":["Whether Y171 phosphorylation affects the same pool as S146-phosphorylated LASP1 unknown","Platelet-specific LASP1 knockout phenotype not reported"]},{"year":2012,"claim":"The complete nuclear shuttling mechanism was elucidated: PKA phosphorylation at S146 triggers LASP1/ZO-2 complex nuclear import, CRM1 mediates export via a nuclear export signal, and PP2B dephosphorylation returns LASP1 to focal contacts — explaining earlier observations of nuclear LASP1 in cancer.","evidence":"Co-IP, proximity ligation assay, leptomycin B treatment, phosphomimetic/phospho-dead mutants, nuclear fractionation","pmids":["22665060"],"confidence":"High","gaps":["Functional consequence of nuclear LASP1 not yet identified","Whether ZO-2 is the sole nuclear import carrier unknown"]},{"year":2015,"claim":"Nuclear LASP1 was found to scaffold the UHRF1/DNMT1/G9a/Snail1 epigenetic silencing complex in a CXCR4/CXCL12-dependent manner, providing the first function for nuclear LASP1 and linking chemokine signaling to epigenetic reprogramming.","evidence":"Proteomic analysis of LASP1 immunoprecipitates, co-IP, proximity ligation assay, CXCR4 antagonist AMD-3100","pmids":["25982273"],"confidence":"High","gaps":["Target genes silenced by this complex not identified","Whether LASP1 is catalytically active or purely structural in the complex unknown","Stoichiometry and assembly order not determined"]},{"year":2019,"claim":"LASP1 was shown to directly bind eIF4A and eIF4B components of the translation initiation complex and to modulate cap-dependent translation of oncogenic mRNAs including BIRC5, revealing a cytoplasmic function in translational control beyond its cytoskeletal roles.","evidence":"GST pull-down, proximity ligation assay, co-IP, 5'UTR luciferase reporter for eIF4A-dependent translation","pmids":["31106142"],"confidence":"High","gaps":["Full translatome regulated by LASP1 not defined","Whether this function requires phosphorylation at specific sites unknown","Relationship between cytoskeletal and translational functions unclear"]},{"year":2020,"claim":"Two additional effector arms were defined: LASP1 binds N-WASP to stimulate Arp2/3-dependent actin polymerization promoting CRC invasion, and LASP1 directly binds Ago2 in a phosphorylation-dependent manner to modulate Let-7a-guided RNAi activity and CCR7 expression.","evidence":"Yeast two-hybrid, co-IP, actin polymerization assay, xenograft for N-WASP; GST pull-down with phospho-mutants, PLA, Let-7a target analysis for Ago2","pmids":["32704133","32872485"],"confidence":"High","gaps":["Whether N-WASP and Ago2 interactions compete for the same LASP1 pool unknown","Broader miRNA repertoire affected by LASP1-Ago2 not characterized","In vivo validation of Ago2 interaction lacking"]},{"year":2021,"claim":"LASP1 was identified as a component of the Cadherin-11/β-Catenin complex at cell-cell contacts in fibroblast-like synoviocytes, and Lasp1 deletion in TNF-transgenic mice reduced arthritic joint destruction, establishing a role in inflammatory joint disease pathology.","evidence":"Co-IP, siRNA/antibody blocking, PDGF response assay, Lasp1 knockout crossed to hTNF-transgenic arthritis model","pmids":["34131132"],"confidence":"High","gaps":["Whether LASP1 directly binds Cadherin-11 or β-Catenin or is recruited indirectly not resolved","Mechanism by which LASP1 loss reduces joint destruction at the molecular level unclear"]},{"year":2022,"claim":"Post-translational regulation of LASP1 was expanded beyond phosphorylation: HBX-induced SUMOylation via RANBP2/RANGAP1 stabilizes HER2 by preventing its ubiquitination, and TRIM15-mediated K63-linked ubiquitination of LASP1 promotes its nuclear translocation and TKI resistance.","evidence":"Co-IP, SUMOylation assay, K63-linkage-specific ubiquitination assay, nuclear fractionation, TKI resistance assay","pmids":["36473530","36670097"],"confidence":"Medium","gaps":["SUMOylation sites on LASP1 not mapped","Whether SUMOylation and K63-ubiquitination are coordinated or mutually exclusive unknown","Both findings from single labs without independent replication"]},{"year":null,"claim":"A comprehensive structural model of full-length LASP1 in complex with its key partners, the precise gene targets of the nuclear LASP1-epigenetic complex, and the in vivo physiological consequences of LASP1 loss beyond gastric acid secretion and arthritis remain to be determined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length crystal or cryo-EM structure of LASP1","Target gene repertoire of the UHRF1/DNMT1/G9a/Snail1-LASP1 complex undefined","Comprehensive phenotyping of Lasp1 knockout across organ systems not reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2,5,6,7,8,10,11,16,19,30]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[7,10,18,22,27,33]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,5,6,7,8,10,11,16,17,19,30]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[12,18,22,31,32,36]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,5,6,8,18]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,6,17,33]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[17,22,25,28,31,32]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[7,10,33]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[22,32]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,5,17,20,35,36]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[24]}],"complexes":["UHRF1/DNMT1/G9a/Snail1 epigenetic complex","Cadherin-11/β-Catenin complex","eIF4F translation initiation complex"],"partners":["ACTA1","ZYX","PALLD","WASL","KRT80","AGO2","PTK2","TJP2"],"other_free_text":[]},"mechanistic_narrative":"LASP1 is a multidomain actin-binding scaffold protein that coordinates cytoskeletal dynamics, cell migration, and nuclear signaling through phosphorylation-regulated shuttling between focal adhesions and the nucleus. Its LIM domain, nebulin-repeat actin-binding region, and SH3 domain mediate direct interactions with F-actin (Kd ~2 µM), zyxin, palladin-140kDa, N-WASP/Arp2/3, Krp1, and FAK at focal contacts, podosomes, and lamellipodia, where it is required for zyxin recruitment, pseudopodial elongation, podosome-mediated matrix degradation, and cell migration [PMID:9848085, PMID:15004028, PMID:16430883, PMID:22514729, PMID:32704133]. PKA phosphorylation at Ser146 reduces F-actin binding affinity and triggers ZO-2-dependent nuclear import (with CRM1-mediated export and PP2B-dependent cytoplasmic return), while Src/BCR-ABL phosphorylation at Tyr171 regulates focal adhesion targeting and Ago2 binding to modulate Let-7a-guided RNAi [PMID:12432067, PMID:22665060, PMID:19718473, PMID:32872485]. In the nucleus, LASP1 serves as a scaffold for the UHRF1/DNMT1/G9a/Snail1 epigenetic silencing complex and interacts with eIF4A/eIF4B to promote cap-dependent translation of oncogenic mRNAs, linking CXCR4/CXCL12 chemokine signaling to both epigenetic reprogramming and translational control [PMID:25982273, PMID:31106142]."},"prefetch_data":{"uniprot":{"accession":"Q14847","full_name":"LIM and SH3 domain protein 1","aliases":["Metastatic lymph node gene 50 protein","MLN 50"],"length_aa":261,"mass_kda":29.7,"function":"Plays an important role in the regulation of dynamic actin-based, cytoskeletal activities. Agonist-dependent changes in LASP1 phosphorylation may also serve to regulate actin-associated ion transport activities, not only in the parietal cell but also in certain other F-actin-rich secretory epithelial cell types (By similarity)","subcellular_location":"Cytoplasm, cell cortex; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q14847/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LASP1","classification":"Not Classified","n_dependent_lines":20,"n_total_lines":1208,"dependency_fraction":0.016556291390728478},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LASP1","total_profiled":1310},"omim":[{"mim_id":"617544","title":"LONG INTERGENIC NONCODING RNA 672; LINC00672","url":"https://www.omim.org/entry/617544"},{"mim_id":"616770","title":"MICRO RNA 218-1; MIR218-1","url":"https://www.omim.org/entry/616770"},{"mim_id":"605491","title":"NEBULETTE; NEBL","url":"https://www.omim.org/entry/605491"},{"mim_id":"602920","title":"LIM AND SH3 PROTEIN 1; LASP1","url":"https://www.omim.org/entry/602920"},{"mim_id":"602002","title":"ZYXIN; ZYX","url":"https://www.omim.org/entry/602002"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Focal adhesion sites","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/LASP1"},"hgnc":{"alias_symbol":["MLN50","Lasp-1"],"prev_symbol":[]},"alphafold":{"accession":"Q14847","domains":[{"cath_id":"2.10.110.10","chopping":"1-58","consensus_level":"medium","plddt":91.111,"start":1,"end":58},{"cath_id":"2.30.30.40","chopping":"206-259","consensus_level":"high","plddt":93.1694,"start":206,"end":259}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14847","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14847-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14847-F1-predicted_aligned_error_v6.png","plddt_mean":70.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LASP1","jax_strain_url":"https://www.jax.org/strain/search?query=LASP1"},"sequence":{"accession":"Q14847","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14847.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14847/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14847"}},"corpus_meta":[{"pmid":"22713668","id":"PMC_22713668","title":"MicroRNA-203 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paper with 131 citations\",\n      \"pmids\": [\"7589475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The N-terminal zinc-binding module of the LASP1 LIM domain was resolved by NMR spectroscopy; zinc is coordinated by Cys5, Cys8, His26, and Cys29, establishing the N-terminal half of a LIM domain as an independent folding unit.\",\n      \"method\": \"1H NMR spectroscopy and energy-refined conformer calculation\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with zinc coordination sites identified by calculation without constraints\",\n      \"pmids\": [\"8841116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"LASP1 contains a functional actin-binding domain in the core of the protein; it binds actin in vivo and in vitro, co-localizes with actin at peripheral cell extensions, and is tyrosine-phosphorylated in Src-transformed fibroblasts.\",\n      \"method\": \"In vitro actin-binding assay, confocal immunofluorescence, transfection in c-SrcY527F-transformed cells\",\n      \"journal\": \"Molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro binding assay plus in vivo co-localization and phosphorylation demonstrated\",\n      \"pmids\": [\"9848085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"LASP1 (pp40) is a cAMP-dependent phosphoprotein substrate of PKA in gastric parietal cells; forskolin stimulation produces a higher-molecular-weight phosphorylated form, and the protein contains conserved PKA consensus sequences.\",\n      \"method\": \"Protein isolation, microsequencing, cDNA cloning, Western blot, Northern blot, forskolin stimulation\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical isolation, sequencing, and functional phosphorylation demonstrated\",\n      \"pmids\": [\"9688835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Histamine-induced cAMP elevation in gastric parietal cells increases LASP1 phosphorylation and causes partial redistribution of LASP1 from the cell cortex (where it co-localizes with γ-actin) to the β-actin-enriched intracellular canalicular region, the site of active proton transport.\",\n      \"method\": \"Immunofluorescence, subcellular fractionation, cAMP stimulation assay in parietal cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment tied to functional acid secretion response, replicated in multiple epithelial cell types\",\n      \"pmids\": [\"10806114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"LASP1 binds non-muscle F-actin in vitro with Kd ~2 µM (saturation ~1:7); PKA phosphorylation at Ser99 and Ser146 increases the Kd and decreases Bmax, reducing F-actin binding affinity. Alanine substitution at these sites suppresses cAMP-dependent translocation to the intracellular canalicular region in parietal cells.\",\n      \"method\": \"Actin pull-down assay with bacterially expressed His-tagged LASP1, site-directed mutagenesis, PKA phosphorylation in vitro, parietal cell transfection\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with quantified binding, mutagenesis, and functional localization consequence\",\n      \"pmids\": [\"12432067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LASP1 localizes to focal complexes and the leading edge of pseudopodia in migratory cells and is required for cell migration (but not adhesion) in response to growth factors and ECM proteins. c-Abl kinase phosphorylates LASP1 at tyrosine 171 upon apoptotic stimulation, causing loss of focal adhesion localization and induction of cell death.\",\n      \"method\": \"Large-scale proteomic analysis of pseudopodia, siRNA knockdown, immunofluorescence, c-Abl kinase assay, site-directed mutagenesis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — proteomic identification, knockdown with migration phenotype, kinase site mutagenesis; 119 citations\",\n      \"pmids\": [\"15138294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LASP1 interacts with zyxin via its SH3 domain; the SH3 domain is necessary and sufficient for zyxin binding. The binding site in zyxin is at its extreme N-terminus and does not contain a classical PXXP sequence. LASP1 and zyxin co-localize at focal adhesions.\",\n      \"method\": \"Co-precipitation, yeast two-hybrid, site-directed mutagenesis of zyxin N-terminus\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reciprocal binding assays plus mutagenesis mapping binding sites on both partners; 97 citations\",\n      \"pmids\": [\"15004028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mouse LASP1 is phosphorylated in intact cells specifically at threonine 156 by PKA and PKG; in vitro PKA/PKG can also phosphorylate Ser61 and Ser99. Forskolin induces translocation of LASP1 from focal contacts to the cell interior. Overlay studies show LASP1 directly binds proline-rich domains of zyxin, LPP, and VASP (zyxin being the most prominent partner); LASP1 exists as a monomer.\",\n      \"method\": \"In vitro kinase assay, phosphopeptide mapping, immunofluorescence, overlay assay, gel filtration\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro phosphorylation with site identification plus direct binding overlay assays\",\n      \"pmids\": [\"15465019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LASP1 is a component of CNS postsynaptic densities and is concentrated at synaptic sites and dendritic spines in neurons.\",\n      \"method\": \"MudPIT proteomic analysis of purified postsynaptic fractions, immunofluorescence\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomic identification plus localization, single lab\",\n      \"pmids\": [\"15372503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"LASP1 silencing in breast cancer cells arrests cells in G2/M phase, reduces proliferation and migration; overexpression in non-tumor PTK-2 cells increases motility. LASP1 knockdown reduces zyxin binding to focal contacts without altering actin stress fibers, whereas zyxin silencing does not affect LASP1 localization, indicating LASP1 is required for recruiting zyxin to focal contacts.\",\n      \"method\": \"siRNA knockdown, cell cycle analysis, wound-healing assay, immunofluorescence\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — directional epistasis experiment (LASP1→zyxin localization) plus gain/loss-of-function phenotypes; 106 citations\",\n      \"pmids\": [\"16430883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The 140 kDa isoform of palladin (but not 90 kDa) directly binds LASP1 via an SH3-domain binding motif, confirmed by yeast two-hybrid and GST pull-down assays. Isoform-specific siRNA experiments show 140 kDa palladin recruits LASP1 to stress fibers.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, isoform-specific siRNA, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — yeast two-hybrid plus GST pull-down plus functional siRNA rescue\",\n      \"pmids\": [\"16492705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LASP1 is not exclusively cytosolic; it is also detectable in the nucleus of breast cancer cells as confirmed by Western blot of nuclear/cytosolic fractionations and confocal microscopy. Nuclear LASP1 localization correlates with increased tumor size and nodal positivity.\",\n      \"method\": \"Nuclear/cytosolic fractionation Western blot, confocal immunofluorescence microscopy\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct fractionation and imaging confirming nuclear localization; single lab\",\n      \"pmids\": [\"17956604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Targeted disruption of Lasp1 in mice results in enhanced histamine-stimulated HCl secretion in parietal cells, indicating that Lasp1 negatively regulates parietal cell acid secretion, likely by modulating trafficking/activation of the H+,K+-ATPase proton pump through cAMP-dependent phosphorylation-regulated actin interactions.\",\n      \"method\": \"Lasp1 gene knockout mouse model, in vivo gastric acid secretion measurement, [14C]aminopyrine accumulation in isolated gastric glands\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with specific quantitative physiological readout, in vivo and ex vivo\",\n      \"pmids\": [\"18483181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"p53 transcriptionally represses LASP1 via a p53 response element in the LASP1 promoter; wild-type p53 (but not DNA-binding mutants) suppresses LASP1 in p53-null cells, while p53 siRNA upregulates LASP1 in p53-expressing cells.\",\n      \"method\": \"Transient transfection, luciferase reporter assay, siRNA, site-directed mutagenesis of p53 DNA-binding residues\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reporter assay plus reciprocal gain/loss-of-function and mutagenesis\",\n      \"pmids\": [\"19155088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"LASP1 is a downstream effector of urokinase-type plasminogen activator (uPA) in hepatocellular carcinoma; uPA silencing by RNAi reduces LASP1 expression, and ectopic uPA overexpression increases LASP1, with both proteins affecting cell motility. LASP1 depletion disrupts actin microfilament organization.\",\n      \"method\": \"2D-DIGE proteomics, MALDI-TOF-MS identification, Western blot, immunofluorescence, siRNA knockdown\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomic identification confirmed by Western blot and functional assays, single lab\",\n      \"pmids\": [\"19177205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Kelch-related protein 1 (Krp1) directly interacts with LASP1 in membrane ruffles at the tips of pseudopodia; two specific binding sites on Krp1 (amino acids 317-327 and 563-574) are brought into proximity by a novel six-bladed β-propeller structure. Both sites are necessary for Krp1-LASP1 interaction in vitro and for pseudopodial elongation in vivo.\",\n      \"method\": \"Peptide array probing with recombinant LASP1, mutational analysis, crystal structure of Krp1 C-terminal domain, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus mutational validation plus functional in vivo consequence\",\n      \"pmids\": [\"19726686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Src kinase phosphorylates LASP1 at tyrosine 171 in thrombin-stimulated platelets; fibrinogen-mediated integrin αIIbβ3 activation triggers this phosphorylation, which promotes LASP1 translocation from cytosol to focal contacts and leading lamellae, indicating a role in platelet cytoskeleton rearrangement.\",\n      \"method\": \"Src-specific inhibitors, site-directed mutagenesis (Y171), immunofluorescence of adherent platelets and CHO cell model\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis identifies site, pharmacological and cell biological validation in two models\",\n      \"pmids\": [\"19718473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LASP1 nuclear import is regulated by PKA-dependent phosphorylation at serine 146, which induces translocation of the LASP1/ZO-2 complex from cytoplasm to nucleus. Interaction occurs between the C-terminal proline-rich motif of ZO-2 and the SH3 domain of LASP1. Nuclear export is mediated by CRM1 and a newly identified nuclear export signal in LASP1. Dephosphorylation by PP2B relocalizes LASP1 back to focal contacts.\",\n      \"method\": \"Co-IP, in situ proximity ligation assay, nuclear/cytosolic fractionation, CRM1 inhibitor (leptomycin B), phosphomimetic/phospho-dead mutants\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods identifying mechanism of nuclear shuttling including writer (PKA), eraser (PP2B), and carrier (ZO-2/CRM1)\",\n      \"pmids\": [\"22665060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LASP1 is a novel component of podosomes, localizing to the podosome ring structure (co-localizing with zyxin and vinculin), and is recruited during early podosome assembly. LASP1 knockdown in human macrophages impairs podosome dynamics and matrix degradation capacity.\",\n      \"method\": \"Immunofluorescence, live cell imaging, siRNA knockdown, matrix degradation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — live imaging of recruitment plus loss-of-function with specific functional readout\",\n      \"pmids\": [\"22514729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LASP1 is a direct substrate of BCR-ABL oncogenic kinase in CML; BCR-ABL specifically phosphorylates LASP1 at tyrosine 171, which is abolished by tyrosine kinase inhibitor therapy. Phospho-LASP1-Y171 binds to non-phosphorylated CRKL at its SH2 domain, disrupting normal CRKL regulation.\",\n      \"method\": \"Phosphoproteomic mass spectrometry, in vitro kinase assay, co-IP, tyrosine kinase inhibitor treatment of CML patients\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — kinase assay plus patient samples plus defined binding interaction with phospho-dependency\",\n      \"pmids\": [\"24913448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LASP1 overexpression in pancreatic ductal adenocarcinoma is mediated by HIF1α, which directly binds a hypoxia response element in the LASP1 promoter, promoting LASP1 expression in vitro and in mouse xenografts.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, HIF1α knockdown/overexpression, xenograft tumor model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrates direct HIF1α binding, reporter validates functional element, in vivo confirmation\",\n      \"pmids\": [\"25385028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nuclear LASP1 acts as a hub for an epigenetic complex comprising UHRF1, DNMT1, G9a, and the transcription factor Snail1. CXCL12-activated CXCR4 signaling drives nuclear translocation of LASP1, which then associates with UHRF1, G9a, Snail1, and di/tri-methylated histone H3 in a CXCL12-dependent manner. LASP1 directly binds Snail1, potentially stabilizing it.\",\n      \"method\": \"Proteomic analysis of LASP1 immunoprecipitates, co-IP, proximity ligation assay, CXCR4 antagonist AMD-3100, 3D Matrigel culture\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomics plus co-IP plus PLA with chemokine-dependent control; multiple orthogonal methods\",\n      \"pmids\": [\"25982273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LASP1 interacts with S100A11 and enhances its expression, driving TGFβ-mediated epithelial-mesenchymal transition in colorectal cancer. LASP1-S100A11 axis operates through downstream effectors flotillin-1 (cytoplasmic) and histone H1 (nuclear).\",\n      \"method\": \"Co-IP, subcellular fractionation, siRNA knockdown, xenograft assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP plus in vivo validation, single lab\",\n      \"pmids\": [\"27181092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LASP1 regulates expression and secretion of MMP1, MMP3, and MMP9 in invasive breast cancer cells. LASP1 depletion reduces AP-1 transcriptional activity, which controls MMP expression. LASP1 also promotes MMP secretion into the extracellular matrix.\",\n      \"method\": \"Microarray analysis, Western blot, luciferase reporter assay for AP-1 activity, zymography, rescue experiments\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay plus zymography plus rescue; single lab\",\n      \"pmids\": [\"27588391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LASP1 directly interacts with FAK and facilitates phosphorylation of FAK at Tyr397, which in turn promotes AKT phosphorylation at Ser473, promoting non-small cell lung cancer proliferation and invasion. FAK inhibition abolishes AKT phosphorylation but not vice versa, placing FAK upstream of AKT in the LASP1 pathway.\",\n      \"method\": \"Co-IP, Western blot with phospho-specific antibodies, FAK/AKT inhibitors, epistasis by sequential inhibitor treatment\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP plus pharmacological epistasis, single lab\",\n      \"pmids\": [\"29088849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LASP1 is transcriptionally activated by the transcription factor SOX9, which binds a consensus site in the LASP1 promoter, as demonstrated by luciferase reporter and ChIP assays. SOX9 knockdown phenocopies LASP1 knockdown effects on lung cancer cell proliferation and apoptosis.\",\n      \"method\": \"Luciferase reporter assay, ChIP assay, siRNA knockdown of SOX9 and LASP1\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP plus reporter assay confirming direct transcriptional regulation; single lab\",\n      \"pmids\": [\"29138807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LASP1 interacts with components of the eIF4F translation initiation complex (eIF4A and eIF4B) in a CXCL12-dependent manner. LASP1 directly binds eIF4A and eIF4B (demonstrated by GST pull-down). Genetic silencing of LASP1 impairs eIF4A-dependent translation of oncogenic mRNAs (including BIRC5), and reduces sensitivity to Rocaglamide A.\",\n      \"method\": \"Proteomic screen, proximity ligation assay, co-IP, GST pull-down, 5'UTR luciferase reporter assay\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — GST pull-down plus PLA plus co-IP plus functional translation reporter; multiple orthogonal methods\",\n      \"pmids\": [\"31106142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LASP1 interacts with PTEN, promotes PTEN ubiquitination and degradation, thereby activating the PI3K/AKT signaling pathway in nasopharyngeal carcinoma. LASP1 and PTEN co-localize in NPC cells.\",\n      \"method\": \"Co-IP, ubiquitination assay, immunofluorescence co-localization, rescue experiments with PTEN overexpression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP plus ubiquitination assay plus functional rescue; single lab\",\n      \"pmids\": [\"29531214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HBx upregulates LASP1 transcription through activation of c-Jun (AP-1) via the PI3K/JNK signaling pathway. HBx interacts with phosphorylated c-Jun in HCC cells, and ChIP assay demonstrates HBx binds to the LASP1 promoter together with c-Jun. The N-terminus of HBx is responsible for c-Jun activation.\",\n      \"method\": \"Luciferase reporter assay, ChIP assay, co-IP, PI3K/JNK inhibitors, N-terminal deletion constructs of HBx\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP plus reporter assay plus co-IP; single lab\",\n      \"pmids\": [\"29600594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LASP1 interacts with N-WASP (identified by yeast two-hybrid screen); N-WASP activates the Arp2/3 complex to stimulate actin polymerization, promoting CRC cell migration and invasion. LASP1 interaction with N-WASP does not alter N-WASP expression but rescues Arp2/3-dependent actin polymerization when N-WASP is silenced.\",\n      \"method\": \"Yeast two-hybrid screen, co-IP, actin polymerization assay, in vivo xenograft models\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — yeast two-hybrid discovery plus co-IP validation plus reconstituted actin polymerization assay\",\n      \"pmids\": [\"32704133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CXCR4-activated LASP1 associates with Argonaute 2 (Ago2) in a CXCL12-dependent manner. LASP1 directly binds Ago2 through its LIM and SH3 domains (GST pull-down). Phosphorylation at S146 and Y171 of LASP1 dictates this binding. The LASP1-Ago2 interaction modulates Let-7a-guided RNAi activity and affects levels of Let-7a targets including CCR7.\",\n      \"method\": \"Co-IP, proximity ligation assay, GST pull-down, phospho-dead/phosphomimetic mutants, CXCR4 antagonist AMD3465, Let-7a target expression analysis\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — GST pull-down plus co-IP plus PLA plus phospho-mutant dissection; multiple orthogonal methods\",\n      \"pmids\": [\"32872485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Nuclear LASP1, driven by CXCR4 activation, stabilizes nuclear Snail1 by upregulating nuclear pS473-Akt, pS9-GSK-3β, A20, and LSD1, and directly associating with Snail1, A20, GSK-3β, and LSD1. LASP1 ablation mislocalizes Snail1 and impairs Matrigel invasion.\",\n      \"method\": \"Co-IP of endogenous proteins, proximity ligation assay, CXCR4 antagonist, nuclear fractionation Western blot, Matrigel invasion assay\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus PLA plus nuclear fractionation; single lab\",\n      \"pmids\": [\"32825729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LASP1 functions as a binding partner of the Cadherin-11/β-Catenin complex at zipper-like cell-to-cell contacts in fibroblast-like synoviocytes. Loss or blocking of LASP1 alters pathological tissue formation, migratory behavior, and PDGF response of arthritic FLS. Deletion of Lasp1 in human TNF transgenic mice reduces arthritic joint destruction.\",\n      \"method\": \"Integrative epigenomic profiling, co-IP, siRNA/antibody blocking, PDGF response assay, Lasp1 knockout in TNF-transgenic arthritis mouse model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epigenomics plus co-IP plus in vivo knockout phenotype in disease model\",\n      \"pmids\": [\"34131132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL14 improves LASP1 mRNA stability through m6A modification, thereby activating the LASP1/SRC/AKT signaling axis and promoting fibroblast-like synoviocyte activation in rheumatoid arthritis. LASP1 overexpression reverses the effects of METTL14 knockdown on FLS migration, invasion, and cytokine production.\",\n      \"method\": \"shRNA knockdown of METTL14, Western blot for LASP1/p-SRC/p-AKT, rescue experiments with LASP1 overexpression, RA rat model\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional epistasis (METTL14→m6A→LASP1) with rescue, single lab\",\n      \"pmids\": [\"36878846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HBX promotes LASP1 SUMOylation via RANBP2 and RANGAP1 (which interact with LASP1), increasing LASP1 SUMOylation to stabilize HER2 by preventing its ubiquitination-mediated proteasomal degradation, thereby activating insulin signaling and enhancing HCC cell growth and migration.\",\n      \"method\": \"Co-IP, ubiquitination assay, SUMOylation assay, LASP1/HER2 interaction analysis, identification of RANBP2/RANGAP1 as LASP1 interactors\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP plus ubiquitination/SUMOylation assays; mechanistic chain established but single lab\",\n      \"pmids\": [\"36473530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM15 mediates K63-linked polyubiquitination of LASP1, which promotes LASP1 nuclear translocation in hepatocellular carcinoma, increasing AKT phosphorylation and Snail expression to confer TKI resistance. This is regulated by the AKT/FOXO1 axis controlling TRIM15 expression.\",\n      \"method\": \"Co-IP, ubiquitination assay (K63 linkage-specific), Western blot for nuclear fractionation, FOXO1/AKT pathway analysis, TKI resistance assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ubiquitination assay with linkage specificity plus nuclear fractionation plus functional TKI resistance readout; single lab\",\n      \"pmids\": [\"36670097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LASP1 expression is negatively regulated by androgen receptor (AR) at the transcriptional level in prostate cancer; AR suppression elevates LASP1, while AR activation decreases it. LASP1 promotes cell cycle progression through cyclin D1 upregulation, and in vivo antisense oligonucleotide knockdown of LASP1 inhibits CRPC xenograft tumor growth.\",\n      \"method\": \"TMA analysis after hormone deprivation, AR gain/loss-of-function, cyclin D1 Western blot, cell cycle flow cytometry, in vivo ASO treatment of xenografts\",\n      \"journal\": \"The Prostate\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — AR manipulation plus in vivo ASO experiment; single lab\",\n      \"pmids\": [\"27775154\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LASP1 is a multidomain actin-binding scaffold protein (LIM domain, two nebulin repeats, SH3 domain) that dynamically localizes to focal adhesions, podosomes, lamellipodia, and the nucleus; its subcellular distribution and interactions are regulated by phosphorylation (PKA at S146, Src/BCR-ABL at Y171, PKG at T156) and SUMOylation/ubiquitination, with S146 phosphorylation driving ZO-2-dependent nuclear import via CRM1-mediated export, nuclear LASP1 acting as a hub for the UHRF1/DNMT1/G9a/Snail1 epigenetic complex and interacting with Ago2 to modulate RNAi, cytoplasmic LASP1 promoting cell migration through direct binding to F-actin, zyxin, palladin-140kDa, N-WASP/Arp2/3, Krp1, and FAK, and regulation of MMP transcription via AP-1, while also interacting with PTEN (promoting its ubiquitination/degradation to activate PI3K/AKT), HER2, and eIF4F complex components to enhance oncogenic mRNA translation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"LASP1 is a multidomain actin-binding scaffold protein that coordinates cytoskeletal dynamics, cell migration, and nuclear signaling through phosphorylation-regulated shuttling between focal adhesions and the nucleus. Its LIM domain, nebulin-repeat actin-binding region, and SH3 domain mediate direct interactions with F-actin (Kd ~2 µM), zyxin, palladin-140kDa, N-WASP/Arp2/3, Krp1, and FAK at focal contacts, podosomes, and lamellipodia, where it is required for zyxin recruitment, pseudopodial elongation, podosome-mediated matrix degradation, and cell migration [PMID:9848085, PMID:15004028, PMID:16430883, PMID:22514729, PMID:32704133]. PKA phosphorylation at Ser146 reduces F-actin binding affinity and triggers ZO-2-dependent nuclear import (with CRM1-mediated export and PP2B-dependent cytoplasmic return), while Src/BCR-ABL phosphorylation at Tyr171 regulates focal adhesion targeting and Ago2 binding to modulate Let-7a-guided RNAi [PMID:12432067, PMID:22665060, PMID:19718473, PMID:32872485]. In the nucleus, LASP1 serves as a scaffold for the UHRF1/DNMT1/G9a/Snail1 epigenetic silencing complex and interacts with eIF4A/eIF4B to promote cap-dependent translation of oncogenic mRNAs, linking CXCR4/CXCL12 chemokine signaling to both epigenetic reprogramming and translational control [PMID:25982273, PMID:31106142].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Identification of LASP1 as the founding member of a novel LIM-SH3 protein subfamily established its unique domain architecture and predicted dual scaffolding capability.\",\n      \"evidence\": \"cDNA cloning and domain analysis from breast cancer overexpression screen\",\n      \"pmids\": [\"7589475\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No function assigned beyond domain prediction\", \"Binding partners unknown\", \"Subcellular localization not determined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrating that LASP1 directly binds F-actin in vitro and co-localizes with actin at cell extensions, while undergoing Src-dependent tyrosine phosphorylation, established it as a regulated actin-associated protein rather than a purely transcriptional LIM factor.\",\n      \"evidence\": \"In vitro actin-binding assay, confocal microscopy, c-Src-transformed fibroblasts\",\n      \"pmids\": [\"9848085\", \"9688835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Actin-binding domain not mapped to specific residues\", \"Functional consequence of Src phosphorylation undefined\", \"Role in cell motility not yet tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Quantitative binding studies showed PKA phosphorylation at Ser99/Ser146 reduces F-actin affinity, and mutagenesis linked these sites to cAMP-dependent intracellular translocation, revealing phosphorylation as a molecular switch controlling LASP1 subcellular distribution.\",\n      \"evidence\": \"Actin pull-down with His-tagged wild-type and phosphomimetic LASP1, PKA in vitro phosphorylation, parietal cell transfection\",\n      \"pmids\": [\"12432067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear translocation not yet recognized\", \"Identity of the phosphatase reversing the switch unknown\", \"Downstream effectors of translocation uncharacterized\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Multiple studies converged to show LASP1 is required for cell migration (not adhesion), localizes to focal complexes and pseudopodia tips, interacts with zyxin via its SH3 domain, and is phosphorylated at Tyr171 by c-Abl upon apoptotic stimuli — establishing it as a migration-promoting scaffold regulated by multiple kinases.\",\n      \"evidence\": \"siRNA knockdown with migration assay, yeast two-hybrid and co-precipitation for zyxin, c-Abl kinase assay with Y171 mutagenesis, phosphopeptide mapping\",\n      \"pmids\": [\"15138294\", \"15004028\", \"15465019\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which LASP1 promotes migration beyond zyxin recruitment unclear\", \"Whether Y171 and S146 phosphorylation are coordinated unknown\", \"In vivo genetic validation lacking\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Epistasis experiments showed LASP1 knockdown displaces zyxin from focal contacts without reciprocal dependency, and 140-kDa palladin recruits LASP1 to stress fibers via an SH3-binding motif, establishing a hierarchical scaffold network at adhesion sites.\",\n      \"evidence\": \"Reciprocal siRNA of LASP1 and zyxin with immunofluorescence; yeast two-hybrid and isoform-specific siRNA for palladin\",\n      \"pmids\": [\"16430883\", \"16492705\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether palladin and zyxin interactions are simultaneous or competitive unknown\", \"Structural basis of non-canonical SH3 binding not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Lasp1 knockout mice exhibited enhanced gastric acid secretion, providing the first in vivo genetic evidence that LASP1 negatively regulates H+,K+-ATPase trafficking in parietal cells through its actin-regulatory function.\",\n      \"evidence\": \"Lasp1 gene knockout mouse, in vivo gastric acid measurement, aminopyrine accumulation in isolated glands\",\n      \"pmids\": [\"18483181\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of H+,K+-ATPase trafficking regulation not molecularly resolved\", \"Whether other organ systems are affected in knockout not systematically characterized\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Src phosphorylation at Y171 was shown to drive LASP1 translocation to focal contacts in thrombin-stimulated platelets downstream of integrin αIIbβ3, while Krp1 crystal structure revealed a β-propeller presenting two LASP1-binding sites required for pseudopodial elongation — broadening LASP1's role beyond epithelial cells.\",\n      \"evidence\": \"Src inhibitors and Y171 mutagenesis in platelets; crystal structure of Krp1 C-terminal domain plus peptide array mapping\",\n      \"pmids\": [\"19718473\", \"19726686\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Y171 phosphorylation affects the same pool as S146-phosphorylated LASP1 unknown\", \"Platelet-specific LASP1 knockout phenotype not reported\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The complete nuclear shuttling mechanism was elucidated: PKA phosphorylation at S146 triggers LASP1/ZO-2 complex nuclear import, CRM1 mediates export via a nuclear export signal, and PP2B dephosphorylation returns LASP1 to focal contacts — explaining earlier observations of nuclear LASP1 in cancer.\",\n      \"evidence\": \"Co-IP, proximity ligation assay, leptomycin B treatment, phosphomimetic/phospho-dead mutants, nuclear fractionation\",\n      \"pmids\": [\"22665060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of nuclear LASP1 not yet identified\", \"Whether ZO-2 is the sole nuclear import carrier unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Nuclear LASP1 was found to scaffold the UHRF1/DNMT1/G9a/Snail1 epigenetic silencing complex in a CXCR4/CXCL12-dependent manner, providing the first function for nuclear LASP1 and linking chemokine signaling to epigenetic reprogramming.\",\n      \"evidence\": \"Proteomic analysis of LASP1 immunoprecipitates, co-IP, proximity ligation assay, CXCR4 antagonist AMD-3100\",\n      \"pmids\": [\"25982273\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Target genes silenced by this complex not identified\", \"Whether LASP1 is catalytically active or purely structural in the complex unknown\", \"Stoichiometry and assembly order not determined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"LASP1 was shown to directly bind eIF4A and eIF4B components of the translation initiation complex and to modulate cap-dependent translation of oncogenic mRNAs including BIRC5, revealing a cytoplasmic function in translational control beyond its cytoskeletal roles.\",\n      \"evidence\": \"GST pull-down, proximity ligation assay, co-IP, 5'UTR luciferase reporter for eIF4A-dependent translation\",\n      \"pmids\": [\"31106142\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full translatome regulated by LASP1 not defined\", \"Whether this function requires phosphorylation at specific sites unknown\", \"Relationship between cytoskeletal and translational functions unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Two additional effector arms were defined: LASP1 binds N-WASP to stimulate Arp2/3-dependent actin polymerization promoting CRC invasion, and LASP1 directly binds Ago2 in a phosphorylation-dependent manner to modulate Let-7a-guided RNAi activity and CCR7 expression.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, actin polymerization assay, xenograft for N-WASP; GST pull-down with phospho-mutants, PLA, Let-7a target analysis for Ago2\",\n      \"pmids\": [\"32704133\", \"32872485\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether N-WASP and Ago2 interactions compete for the same LASP1 pool unknown\", \"Broader miRNA repertoire affected by LASP1-Ago2 not characterized\", \"In vivo validation of Ago2 interaction lacking\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"LASP1 was identified as a component of the Cadherin-11/β-Catenin complex at cell-cell contacts in fibroblast-like synoviocytes, and Lasp1 deletion in TNF-transgenic mice reduced arthritic joint destruction, establishing a role in inflammatory joint disease pathology.\",\n      \"evidence\": \"Co-IP, siRNA/antibody blocking, PDGF response assay, Lasp1 knockout crossed to hTNF-transgenic arthritis model\",\n      \"pmids\": [\"34131132\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LASP1 directly binds Cadherin-11 or β-Catenin or is recruited indirectly not resolved\", \"Mechanism by which LASP1 loss reduces joint destruction at the molecular level unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Post-translational regulation of LASP1 was expanded beyond phosphorylation: HBX-induced SUMOylation via RANBP2/RANGAP1 stabilizes HER2 by preventing its ubiquitination, and TRIM15-mediated K63-linked ubiquitination of LASP1 promotes its nuclear translocation and TKI resistance.\",\n      \"evidence\": \"Co-IP, SUMOylation assay, K63-linkage-specific ubiquitination assay, nuclear fractionation, TKI resistance assay\",\n      \"pmids\": [\"36473530\", \"36670097\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SUMOylation sites on LASP1 not mapped\", \"Whether SUMOylation and K63-ubiquitination are coordinated or mutually exclusive unknown\", \"Both findings from single labs without independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A comprehensive structural model of full-length LASP1 in complex with its key partners, the precise gene targets of the nuclear LASP1-epigenetic complex, and the in vivo physiological consequences of LASP1 loss beyond gastric acid secretion and arthritis remain to be determined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length crystal or cryo-EM structure of LASP1\", \"Target gene repertoire of the UHRF1/DNMT1/G9a/Snail1-LASP1 complex undefined\", \"Comprehensive phenotyping of Lasp1 knockout across organ systems not reported\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2, 5, 6, 7, 8, 10, 11, 16, 19, 30]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [7, 10, 18, 22, 27, 33]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 5, 6, 7, 8, 10, 11, 16, 17, 19, 30]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [12, 18, 22, 31, 32, 36]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 5, 6, 8, 18]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 6, 17, 33]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [17, 22, 25, 28, 31, 32]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [7, 10, 33]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [22, 32]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 5, 17, 20, 35, 36]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"complexes\": [\n      \"UHRF1/DNMT1/G9a/Snail1 epigenetic complex\",\n      \"Cadherin-11/β-Catenin complex\",\n      \"eIF4F translation initiation complex\"\n    ],\n    \"partners\": [\n      \"ACTA1\",\n      \"ZYX\",\n      \"PALLD\",\n      \"WASL\",\n      \"KRT80\",\n      \"AGO2\",\n      \"PTK2\",\n      \"TJP2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}