{"gene":"TLN2","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2001,"finding":"TLN2 encodes a protein similar in size and sequence to talin1 throughout its length (74% identity, 86% similarity), with conserved intron/exon boundaries (except two), but gives rise to multiple transcripts with highest expression in heart, in contrast to the ubiquitously expressed single ~8-kb talin1 mRNA.","method":"Genomic database assembly, EST analysis, and sequence comparison","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic sequencing and sequence comparison; single study but systematic analysis of gene structure and expression","pmids":["11527381"],"is_preprint":false},{"year":2005,"finding":"Mammalian Talin-1 and Talin-2 bind to different protein partners as determined by proteomic analysis, indicating functional divergence following gene duplication early in the chordate lineage.","method":"Proteomic analysis (protein interaction profiling)","journal":"Gene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single proteomic screen, no reciprocal validation or specific interactor details provided in abstract","pmids":["16216449"],"is_preprint":false},{"year":2007,"finding":"Talin2 expression is upregulated during striated muscle differentiation (at both mRNA and protein levels), localizes to costameres and intercalated disks in mature striated muscle (stable adhesion complexes), whereas talin1 localizes to focal adhesions in undifferentiated myoblasts. GFP-Talin2 ectopic expression in myoblasts dysregulates the actin cytoskeleton.","method":"Isoform-specific antibodies, GFP-tagging and live-cell imaging, C2C12 and primary human myoblast differentiation model, RT-PCR and western blot","journal":"Cell motility and the cytoskeleton","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (isoform-specific antibodies, GFP localization, differentiation time-course at mRNA and protein level) in a single focused study with clear functional readouts","pmids":["17183545"],"is_preprint":false},{"year":2012,"finding":"In the adult mouse heart, Talin2 is the dominant talin isoform localizing to costameres; global deletion of Tln2 in mice caused no structural or functional cardiac changes because cardiomyocyte Talin1 became upregulated as compensation. Tln2 loss increased integrin activation but reduced β1D-integrin isoform levels by 50%.","method":"Global Tln2 knockout mouse, cardiac function assessment, western blot, immunofluorescence","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse with defined molecular phenotype (integrin levels, activation state), functional cardiac assessment, compensatory mechanism identified","pmids":["28698364"],"is_preprint":false},{"year":2012,"finding":"Combined loss of both CM Talin1 and Talin2 in cardiomyocytes led to cardiac dysfunction by 4 weeks with 100% mortality by 6 months, loss of β1D-integrin and other costameric proteins from cardiomyocytes, compromised membrane integrity, and dilated cardiomyopathy. Transgenic integrin overexpression could not rescue the phenotype.","method":"Cardiomyocyte-specific double knockout mice, cardiac function assessment, histology, immunofluorescence, western blot","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double-knockout with clear molecular and functional phenotype; multiple methods including functional cardiac assessment, protein localization and quantification","pmids":["28698364"],"is_preprint":false},{"year":2012,"finding":"Mice with complete deletion of the Tln2 coding sequence are viable and fertile with normal organ weights, displaying only a mildly dystrophic phenotype. Tln2-null mouse embryo fibroblasts show no obvious defects in cell adhesion, migration, or proliferation.","method":"Complete coding sequence deletion knockin mouse (Tln2(cd)), organ weight measurement, MEF functional assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean null allele mouse model with multiple phenotypic readouts; single study","pmids":["22925892"],"is_preprint":false},{"year":2012,"finding":"Talin1 is the dominant talin isoform in embryonic cardiomyocytes, whereas Talin2 becomes the main isoform in postnatal cardiomyocytes, localizing to costameres. Cardiomyocyte-specific Tln1 knockout mice show normal basal cardiac structure but blunted hypertrophy, less fibrosis, and improved cardiac function after pressure overload, with strongly blunted acute ERK1/2, p38, Akt, and GSK3 signaling responses.","method":"Cardiomyocyte-specific Tln1 conditional knockout, pressure overload model, echocardiography, western blot for signaling kinases, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with mechanosignaling pathway readouts, multiple orthogonal methods","pmids":["23266827"],"is_preprint":false},{"year":2016,"finding":"Talin2 has a much stronger binding to β-integrin tails than talin1. Talin2 localizes at invadopodia and is indispensable for traction force generation and invadopodium-mediated matrix degradation. Ablation of talin2 suppressed traction force and invadopodia formation; re-expression of wild-type talin2 but not talin1 rescued these phenotypes. Replacement of talin2 Ser339 with Cys significantly decreased its binding to β1-integrin tails to levels comparable to talin1, and talin2(S339C) could not rescue traction force or invadopodia in talin2-depleted cells.","method":"siRNA knockdown, traction force microscopy, invadopodium assay, matrix degradation assay, rescue experiments with wild-type and mutant talin2, integrin-binding assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal functional assays (traction force, invadopodia, matrix degradation) combined with structure-function mutagenesis and rescue experiments","pmids":["27694340"],"is_preprint":false},{"year":2017,"finding":"Talin2 S339 forms a hydrogen bond with E353, which is critical for inducing key hydrogen bonds between talin2 N326 and β1-integrin R760, and between talin2 K327 and β1-integrin D759, explaining talin2's higher affinity for β1-integrin relative to talin1. Mutation of talin2 S339L (causing Fifth Finger Camptodactyly) completely disrupted binding to β-integrin tails; substitution of talin1 C336 with Ser enhanced talin1 affinity whereas S339C substitution in talin2 diminished its affinity.","method":"Integrin-binding affinity assays, site-directed mutagenesis, computational molecular modeling","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis with binding assays and computational modeling; single study; structural basis inferred computationally rather than by direct structure determination","pmids":["28155884"],"is_preprint":false},{"year":2016,"finding":"Exome sequencing identified a missense variant c.1016C>T (p.S339L) in TLN2 co-segregating with Fifth Finger Camptodactyly in a four-generation Chinese Han family. Expression of wild-type and S339L mutant TLN2 in HEK293 cells showed predominant cytoplasmic localization for both.","method":"Exome sequencing, Sanger sequencing, co-segregation analysis, HEK293 overexpression with subcellular localization","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — genetic co-segregation plus cell expression; localization experiment single method, limited functional follow-up","pmids":["27223613"],"is_preprint":false},{"year":2018,"finding":"WWC1 (KIBRA) and TLN2 co-immunoprecipitate in brain tissue and HEK293 cells, co-localize in brain tissue cells, N2a neuroblastoma, and HeLa cell lines, and co-expression of both genes modulates Tau toxicity in Drosophila eye experiments.","method":"Co-immunoprecipitation (brain tissue and HEK293), co-localization by immunofluorescence, Drosophila Tau toxicity epistasis assay","journal":"Neurobiology of aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP in two systems plus functional epistasis in Drosophila, single lab","pmids":["30201328"],"is_preprint":false},{"year":2014,"finding":"miR-126-3p directly targets TLN2 by binding a responsive element within the 3'-UTR, as validated by 3'-UTR reporter assays, with an inverse correlation between miR-126-3p and TLN2 mRNA/protein levels during bovine corpus luteum development.","method":"3'-UTR luciferase reporter assay, qRT-PCR and western blot of TLN2 during CL developmental stages","journal":"Reproduction in domestic animals","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR binding validation with reporter assay plus expression correlation; single study in bovine system","pmids":["25244588"],"is_preprint":false},{"year":2022,"finding":"A TLN2 variant (alongside a TPM1 variant) acts as a genetic suppressor: mouse CRISPR knock-in of both the TLN2 and TPM1 variants rescued the heart beating that is absent in Tpm1-mutant embryos (which normally die early with no heartbeat), with near-term fetuses exhibiting large atrial septal defect. This identifies TLN2 as a myofilament actin-binding protein that can suppress a dominant lethal TPM1 mutation.","method":"CRISPR knock-in mouse model, cardiac phenotype assessment, patient iPSC-derived cardiomyocytes","journal":"Cell reports. Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via CRISPR double knock-in mouse with clear phenotypic rescue; single study","pmids":["35243414"],"is_preprint":false},{"year":2025,"finding":"Knockdown of talin2 de-differentiates myofibroblasts, reducing myofibroblast-specific morphology, α-smooth muscle actin content, collagen I content, and the pro-fibrotic secretome. Tln2-/- mice are resistant to bleomycin-induced lung fibrosis and to unilateral ureteral obstruction-induced kidney fibrosis, and talin2 knockdown reverses established bleomycin-induced lung fibrosis.","method":"siRNA knockdown, Tln2 knockout mouse, bleomycin lung fibrosis model, unilateral ureteral obstruction kidney fibrosis model, α-SMA and collagen I immunofluorescence/western blot, secretome analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (cell knockdown, two distinct in vivo fibrosis models in knockout mice) with defined molecular phenotype; single lab but robust multi-model evidence","pmids":["40410300"],"is_preprint":false},{"year":2022,"finding":"TLN2 overexpression inhibited ccRCC cell growth, invasion, and migration in vitro and in vivo, inhibited cell cycle progression, and promoted apoptosis. The anti-tumor function of TLN2 was mechanistically linked to inactivation of the Wnt/β-catenin signaling pathway.","method":"TLN2 overexpression in ccRCC cells, CCK-8, colony formation, transwell, wound healing assays, xenograft in vivo assay, apoptosis/cell cycle flow cytometry, Wnt/β-catenin pathway reporter/activity assay","journal":"Translational andrology and urology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cellular assays plus in vivo xenograft with pathway analysis; single lab, mechanism supported by pathway assay but not by direct molecular interaction experiments","pmids":["35242640"],"is_preprint":false}],"current_model":"TLN2 encodes talin2, a cytoskeletal adaptor that links β-integrins to the actin cytoskeleton with higher affinity for β1-integrin than talin1 (via a unique S339–E353 hydrogen bond network); it localizes to costameres and intercalated disks in mature striated muscle where it maintains β1D-integrin expression and costameric integrity, to invadopodia in cancer cells where it drives traction force generation and matrix degradation required for invasion, and to myofibroblasts where it is required for fibrotic differentiation—with its loss reversing lung and kidney fibrosis in mice—while interacting with KIBRA/WWC1 to modulate tau toxicity and functionally suppressing dominant lethal TPM1 mutations in cardiac development."},"narrative":{"mechanistic_narrative":"TLN2 encodes talin2, a cytoskeletal adaptor that couples β-integrins to the actin cytoskeleton and is enriched in striated muscle and stable adhesion structures [PMID:11527381, PMID:17183545]. During myoblast differentiation talin2 is upregulated and relocates to costameres and intercalated disks—the stable adhesion complexes of mature muscle—whereas talin1 marks the focal adhesions of undifferentiated cells [PMID:17183545]. Talin2 binds β1-integrin tails more strongly than talin1 owing to a unique S339–E353 hydrogen-bond network that positions talin2 N326/K327 against β1-integrin R760/D759; disrupting Ser339 (S339C or the disease variant S339L) abolishes this high-affinity binding [PMID:27694340, PMID:28155884]. In the heart talin2 is the dominant costameric isoform postnatally and maintains β1D-integrin levels, but its loss is tolerated through compensatory talin1 upregulation, while combined cardiomyocyte loss of both isoforms collapses costameric integrity and causes lethal dilated cardiomyopathy [PMID:28698364]. In cancer cells talin2 localizes to invadopodia where its high β-integrin affinity drives traction-force generation and matrix degradation required for invasion, a function talin1 cannot substitute [PMID:27694340]. Talin2 is also required for myofibroblast differentiation and the pro-fibrotic program; its loss confers resistance to and reverses experimental lung and kidney fibrosis [PMID:40410300]. A missense TLN2 variant p.S339L co-segregates with Fifth Finger Camptodactyly [PMID:27223613]. Additional roles include modulation of tau toxicity through interaction with WWC1/KIBRA [PMID:30201328] and genetic suppression of a dominant-lethal TPM1 mutation in cardiac development [PMID:35243414].","teleology":[{"year":2001,"claim":"Established that TLN2 is a distinct talin paralog rather than a talin1 variant, raising the question of isoform-specific function given its heart-enriched expression.","evidence":"Genomic assembly, EST analysis, and sequence comparison","pmids":["11527381"],"confidence":"Medium","gaps":["No functional partners or activities identified","Expression pattern descriptive only"]},{"year":2005,"claim":"Addressed whether talin1 and talin2 diverged functionally after duplication by showing they bind different partner sets.","evidence":"Proteomic protein-interaction profiling","pmids":["16216449"],"confidence":"Low","gaps":["Single screen without reciprocal validation or named interactors","No functional consequence demonstrated"]},{"year":2007,"claim":"Resolved the spatial/temporal division of labor between paralogs: talin2 is the differentiation-induced isoform of stable muscle adhesions.","evidence":"Isoform-specific antibodies, GFP imaging, and C2C12/primary myoblast differentiation time-course","pmids":["17183545"],"confidence":"High","gaps":["Molecular mechanism of costamere targeting unknown","Functional necessity in muscle not yet tested by loss-of-function"]},{"year":2012,"claim":"Defined talin2's in vivo role in the heart and revealed isoform redundancy: talin2 is the dominant postnatal costameric isoform but is dispensable due to talin1 compensation, while loss of both is lethal.","evidence":"Global and cardiomyocyte-specific single and double Tln1/Tln2 knockout mice with cardiac function, histology, and β1D-integrin quantification","pmids":["28698364","23266827"],"confidence":"High","gaps":["Mechanism of talin1 compensatory upregulation unresolved","Why integrin overexpression cannot rescue the double knockout unexplained"]},{"year":2012,"claim":"Tested whole-organism necessity of talin2 with a clean null allele, showing it is largely dispensable outside muscle stress contexts.","evidence":"Complete coding-sequence deletion knockin mouse and Tln2-null MEF adhesion/migration assays","pmids":["22925892"],"confidence":"Medium","gaps":["Mild dystrophic phenotype not mechanistically explained","Possible talin1 compensation in MEFs not assessed"]},{"year":2016,"claim":"Identified the cellular function uniquely requiring talin2 — invadopodial traction force and matrix degradation — and traced it to its stronger β-integrin binding via Ser339.","evidence":"siRNA knockdown, traction force microscopy, invadopodia/matrix-degradation assays, and wild-type/S339C rescue","pmids":["27694340"],"confidence":"High","gaps":["Downstream force-transduction partners at invadopodia not defined","In vivo metastasis relevance not tested"]},{"year":2016,"claim":"Linked TLN2 to a human Mendelian phenotype, providing a disease handle for the Ser339 residue.","evidence":"Exome and Sanger sequencing with four-generation co-segregation and HEK293 localization","pmids":["27223613"],"confidence":"Medium","gaps":["No functional/mechanistic link between S339L and limb development","Localization assay single-method"]},{"year":2017,"claim":"Provided the structural-energetic basis for talin2's preferential β1-integrin binding, unifying the invasion and disease findings around the S339–E353 network.","evidence":"Integrin-binding affinity assays, site-directed mutagenesis, and computational molecular modeling","pmids":["28155884"],"confidence":"Medium","gaps":["Structural basis inferred computationally, not by direct structure determination","Affinity differences not connected to cellular outputs in this study"]},{"year":2018,"claim":"Extended talin2 interactions beyond integrins by identifying WWC1/KIBRA as a partner that modulates tau toxicity.","evidence":"Reciprocal Co-IP in brain and HEK293, co-localization in multiple cell lines, and Drosophila tau epistasis","pmids":["30201328"],"confidence":"Medium","gaps":["Mechanism of tau-toxicity modulation unknown","Single-lab data; binding interface undefined"]},{"year":2022,"claim":"Implicated talin2 as a myofilament actin-binding protein capable of genetically suppressing a dominant-lethal TPM1 mutation in cardiac development.","evidence":"CRISPR double knock-in mouse with cardiac phenotype rescue and patient iPSC-derived cardiomyocytes","pmids":["35243414"],"confidence":"Medium","gaps":["Molecular mechanism of suppression unresolved","Residual atrial septal defect unexplained"]},{"year":2022,"claim":"Indicated a tumor-suppressive role in clear-cell renal carcinoma linked to Wnt/β-catenin inactivation.","evidence":"TLN2 overexpression in ccRCC cells, xenograft, cell cycle/apoptosis flow cytometry, and Wnt pathway activity assay","pmids":["35242640"],"confidence":"Medium","gaps":["Pathway link not supported by direct molecular interaction","Apparent contrast with pro-invasive role in other cancers unreconciled"]},{"year":2025,"claim":"Established talin2 as a driver of myofibroblast differentiation and a reversible target in organ fibrosis.","evidence":"siRNA knockdown, Tln2 knockout mice, bleomycin lung and ureteral-obstruction kidney fibrosis models, α-SMA/collagen I and secretome readouts","pmids":["40410300"],"confidence":"High","gaps":["Signaling pathway connecting talin2 to myofibroblast program undefined","Mechanotransduction step driving fibrotic differentiation not pinpointed"]},{"year":null,"claim":"How talin2's integrin-binding adaptor activity is mechanistically converted into context-specific outputs—pro-invasive force at invadopodia versus pro-fibrotic differentiation versus tumor suppression—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying signaling mechanism across cell types","Force-sensing partners downstream of talin2 not mapped","Opposing roles in different cancers not reconciled"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,7]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2,7,12]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,7]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[13]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[2,3,4]}],"complexes":["costamere","intercalated disk","invadopodium"],"partners":["ITGB1","WWC1","TPM1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y4G6","full_name":"Talin-2","aliases":[],"length_aa":2542,"mass_kda":271.6,"function":"As a major component of focal adhesion plaques that links integrin to the actin cytoskeleton, may play an important role in cell adhesion. Recruits PIP5K1C to focal adhesion plaques and strongly activates its kinase activity (By similarity)","subcellular_location":"Cytoplasm; Cell junction, focal adhesion; Synapse; Cell membrane; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q9Y4G6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TLN2","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TLN2","total_profiled":1310},"omim":[{"mim_id":"615845","title":"MICRO RNA 190A; MIR190A","url":"https://www.omim.org/entry/615845"},{"mim_id":"607349","title":"TALIN 2; TLN2","url":"https://www.omim.org/entry/607349"},{"mim_id":"606102","title":"PHOSPHATIDYLINOSITOL 4-PHOSPHATE 5-KINASE, TYPE I, GAMMA; PIP5K1C","url":"https://www.omim.org/entry/606102"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Focal adhesion sites","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"kidney","ntpm":35.3}],"url":"https://www.proteinatlas.org/search/TLN2"},"hgnc":{"alias_symbol":["KIAA0320","ILWEQ"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y4G6","domains":[{"cath_id":"3.10.20.90","chopping":"5-130","consensus_level":"medium","plddt":77.3369,"start":5,"end":130},{"cath_id":"2.30.29.30","chopping":"314-386","consensus_level":"medium","plddt":76.7255,"start":314,"end":386},{"cath_id":"1.20.1420.10","chopping":"540-565_573-598_608-662","consensus_level":"medium","plddt":84.4422,"start":540,"end":662},{"cath_id":"1.20.120.230","chopping":"665-793","consensus_level":"medium","plddt":83.93,"start":665,"end":793},{"cath_id":"1.20.1420.10","chopping":"1061-1079_1086-1204","consensus_level":"high","plddt":81.8462,"start":1061,"end":1204},{"cath_id":"1.20.1420.10","chopping":"1210-1358","consensus_level":"medium","plddt":75.6507,"start":1210,"end":1358},{"cath_id":"1.20.120.230","chopping":"1468-1488_1499-1579","consensus_level":"medium","plddt":79.105,"start":1468,"end":1579},{"cath_id":"1.20.1420.10","chopping":"1659-1815","consensus_level":"medium","plddt":83.1273,"start":1659,"end":1815},{"cath_id":"1.20.1420.10","chopping":"1824-1973","consensus_level":"medium","plddt":77.7319,"start":1824,"end":1973},{"cath_id":"1.20.1420.10","chopping":"1976-2125","consensus_level":"medium","plddt":82.8199,"start":1976,"end":2125},{"cath_id":"1.20.1420.10","chopping":"2139-2298","consensus_level":"medium","plddt":81.4442,"start":2139,"end":2298},{"cath_id":"1.20.1410.10","chopping":"2303-2328_2340-2481","consensus_level":"high","plddt":73.1575,"start":2303,"end":2481}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y4G6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y4G6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y4G6-F1-predicted_aligned_error_v6.png","plddt_mean":76.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TLN2","jax_strain_url":"https://www.jax.org/strain/search?query=TLN2"},"sequence":{"accession":"Q9Y4G6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y4G6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y4G6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y4G6"}},"corpus_meta":[{"pmid":"26095796","id":"PMC_26095796","title":"Genomic 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identity, 86% similarity), with conserved intron/exon boundaries (except two), but gives rise to multiple transcripts with highest expression in heart, in contrast to the ubiquitously expressed single ~8-kb talin1 mRNA.\",\n      \"method\": \"Genomic database assembly, EST analysis, and sequence comparison\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic sequencing and sequence comparison; single study but systematic analysis of gene structure and expression\",\n      \"pmids\": [\"11527381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mammalian Talin-1 and Talin-2 bind to different protein partners as determined by proteomic analysis, indicating functional divergence following gene duplication early in the chordate lineage.\",\n      \"method\": \"Proteomic analysis (protein interaction profiling)\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single proteomic screen, no reciprocal validation or specific interactor details provided in abstract\",\n      \"pmids\": [\"16216449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Talin2 expression is upregulated during striated muscle differentiation (at both mRNA and protein levels), localizes to costameres and intercalated disks in mature striated muscle (stable adhesion complexes), whereas talin1 localizes to focal adhesions in undifferentiated myoblasts. GFP-Talin2 ectopic expression in myoblasts dysregulates the actin cytoskeleton.\",\n      \"method\": \"Isoform-specific antibodies, GFP-tagging and live-cell imaging, C2C12 and primary human myoblast differentiation model, RT-PCR and western blot\",\n      \"journal\": \"Cell motility and the cytoskeleton\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (isoform-specific antibodies, GFP localization, differentiation time-course at mRNA and protein level) in a single focused study with clear functional readouts\",\n      \"pmids\": [\"17183545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In the adult mouse heart, Talin2 is the dominant talin isoform localizing to costameres; global deletion of Tln2 in mice caused no structural or functional cardiac changes because cardiomyocyte Talin1 became upregulated as compensation. Tln2 loss increased integrin activation but reduced β1D-integrin isoform levels by 50%.\",\n      \"method\": \"Global Tln2 knockout mouse, cardiac function assessment, western blot, immunofluorescence\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout mouse with defined molecular phenotype (integrin levels, activation state), functional cardiac assessment, compensatory mechanism identified\",\n      \"pmids\": [\"28698364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Combined loss of both CM Talin1 and Talin2 in cardiomyocytes led to cardiac dysfunction by 4 weeks with 100% mortality by 6 months, loss of β1D-integrin and other costameric proteins from cardiomyocytes, compromised membrane integrity, and dilated cardiomyopathy. Transgenic integrin overexpression could not rescue the phenotype.\",\n      \"method\": \"Cardiomyocyte-specific double knockout mice, cardiac function assessment, histology, immunofluorescence, western blot\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double-knockout with clear molecular and functional phenotype; multiple methods including functional cardiac assessment, protein localization and quantification\",\n      \"pmids\": [\"28698364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Mice with complete deletion of the Tln2 coding sequence are viable and fertile with normal organ weights, displaying only a mildly dystrophic phenotype. Tln2-null mouse embryo fibroblasts show no obvious defects in cell adhesion, migration, or proliferation.\",\n      \"method\": \"Complete coding sequence deletion knockin mouse (Tln2(cd)), organ weight measurement, MEF functional assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean null allele mouse model with multiple phenotypic readouts; single study\",\n      \"pmids\": [\"22925892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Talin1 is the dominant talin isoform in embryonic cardiomyocytes, whereas Talin2 becomes the main isoform in postnatal cardiomyocytes, localizing to costameres. Cardiomyocyte-specific Tln1 knockout mice show normal basal cardiac structure but blunted hypertrophy, less fibrosis, and improved cardiac function after pressure overload, with strongly blunted acute ERK1/2, p38, Akt, and GSK3 signaling responses.\",\n      \"method\": \"Cardiomyocyte-specific Tln1 conditional knockout, pressure overload model, echocardiography, western blot for signaling kinases, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with mechanosignaling pathway readouts, multiple orthogonal methods\",\n      \"pmids\": [\"23266827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Talin2 has a much stronger binding to β-integrin tails than talin1. Talin2 localizes at invadopodia and is indispensable for traction force generation and invadopodium-mediated matrix degradation. Ablation of talin2 suppressed traction force and invadopodia formation; re-expression of wild-type talin2 but not talin1 rescued these phenotypes. Replacement of talin2 Ser339 with Cys significantly decreased its binding to β1-integrin tails to levels comparable to talin1, and talin2(S339C) could not rescue traction force or invadopodia in talin2-depleted cells.\",\n      \"method\": \"siRNA knockdown, traction force microscopy, invadopodium assay, matrix degradation assay, rescue experiments with wild-type and mutant talin2, integrin-binding assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal functional assays (traction force, invadopodia, matrix degradation) combined with structure-function mutagenesis and rescue experiments\",\n      \"pmids\": [\"27694340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Talin2 S339 forms a hydrogen bond with E353, which is critical for inducing key hydrogen bonds between talin2 N326 and β1-integrin R760, and between talin2 K327 and β1-integrin D759, explaining talin2's higher affinity for β1-integrin relative to talin1. Mutation of talin2 S339L (causing Fifth Finger Camptodactyly) completely disrupted binding to β-integrin tails; substitution of talin1 C336 with Ser enhanced talin1 affinity whereas S339C substitution in talin2 diminished its affinity.\",\n      \"method\": \"Integrin-binding affinity assays, site-directed mutagenesis, computational molecular modeling\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis with binding assays and computational modeling; single study; structural basis inferred computationally rather than by direct structure determination\",\n      \"pmids\": [\"28155884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Exome sequencing identified a missense variant c.1016C>T (p.S339L) in TLN2 co-segregating with Fifth Finger Camptodactyly in a four-generation Chinese Han family. Expression of wild-type and S339L mutant TLN2 in HEK293 cells showed predominant cytoplasmic localization for both.\",\n      \"method\": \"Exome sequencing, Sanger sequencing, co-segregation analysis, HEK293 overexpression with subcellular localization\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — genetic co-segregation plus cell expression; localization experiment single method, limited functional follow-up\",\n      \"pmids\": [\"27223613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"WWC1 (KIBRA) and TLN2 co-immunoprecipitate in brain tissue and HEK293 cells, co-localize in brain tissue cells, N2a neuroblastoma, and HeLa cell lines, and co-expression of both genes modulates Tau toxicity in Drosophila eye experiments.\",\n      \"method\": \"Co-immunoprecipitation (brain tissue and HEK293), co-localization by immunofluorescence, Drosophila Tau toxicity epistasis assay\",\n      \"journal\": \"Neurobiology of aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP in two systems plus functional epistasis in Drosophila, single lab\",\n      \"pmids\": [\"30201328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-126-3p directly targets TLN2 by binding a responsive element within the 3'-UTR, as validated by 3'-UTR reporter assays, with an inverse correlation between miR-126-3p and TLN2 mRNA/protein levels during bovine corpus luteum development.\",\n      \"method\": \"3'-UTR luciferase reporter assay, qRT-PCR and western blot of TLN2 during CL developmental stages\",\n      \"journal\": \"Reproduction in domestic animals\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR binding validation with reporter assay plus expression correlation; single study in bovine system\",\n      \"pmids\": [\"25244588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A TLN2 variant (alongside a TPM1 variant) acts as a genetic suppressor: mouse CRISPR knock-in of both the TLN2 and TPM1 variants rescued the heart beating that is absent in Tpm1-mutant embryos (which normally die early with no heartbeat), with near-term fetuses exhibiting large atrial septal defect. This identifies TLN2 as a myofilament actin-binding protein that can suppress a dominant lethal TPM1 mutation.\",\n      \"method\": \"CRISPR knock-in mouse model, cardiac phenotype assessment, patient iPSC-derived cardiomyocytes\",\n      \"journal\": \"Cell reports. Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via CRISPR double knock-in mouse with clear phenotypic rescue; single study\",\n      \"pmids\": [\"35243414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Knockdown of talin2 de-differentiates myofibroblasts, reducing myofibroblast-specific morphology, α-smooth muscle actin content, collagen I content, and the pro-fibrotic secretome. Tln2-/- mice are resistant to bleomycin-induced lung fibrosis and to unilateral ureteral obstruction-induced kidney fibrosis, and talin2 knockdown reverses established bleomycin-induced lung fibrosis.\",\n      \"method\": \"siRNA knockdown, Tln2 knockout mouse, bleomycin lung fibrosis model, unilateral ureteral obstruction kidney fibrosis model, α-SMA and collagen I immunofluorescence/western blot, secretome analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (cell knockdown, two distinct in vivo fibrosis models in knockout mice) with defined molecular phenotype; single lab but robust multi-model evidence\",\n      \"pmids\": [\"40410300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TLN2 overexpression inhibited ccRCC cell growth, invasion, and migration in vitro and in vivo, inhibited cell cycle progression, and promoted apoptosis. The anti-tumor function of TLN2 was mechanistically linked to inactivation of the Wnt/β-catenin signaling pathway.\",\n      \"method\": \"TLN2 overexpression in ccRCC cells, CCK-8, colony formation, transwell, wound healing assays, xenograft in vivo assay, apoptosis/cell cycle flow cytometry, Wnt/β-catenin pathway reporter/activity assay\",\n      \"journal\": \"Translational andrology and urology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cellular assays plus in vivo xenograft with pathway analysis; single lab, mechanism supported by pathway assay but not by direct molecular interaction experiments\",\n      \"pmids\": [\"35242640\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TLN2 encodes talin2, a cytoskeletal adaptor that links β-integrins to the actin cytoskeleton with higher affinity for β1-integrin than talin1 (via a unique S339–E353 hydrogen bond network); it localizes to costameres and intercalated disks in mature striated muscle where it maintains β1D-integrin expression and costameric integrity, to invadopodia in cancer cells where it drives traction force generation and matrix degradation required for invasion, and to myofibroblasts where it is required for fibrotic differentiation—with its loss reversing lung and kidney fibrosis in mice—while interacting with KIBRA/WWC1 to modulate tau toxicity and functionally suppressing dominant lethal TPM1 mutations in cardiac development.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TLN2 encodes talin2, a cytoskeletal adaptor that couples β-integrins to the actin cytoskeleton and is enriched in striated muscle and stable adhesion structures [#0, #2]. During myoblast differentiation talin2 is upregulated and relocates to costameres and intercalated disks—the stable adhesion complexes of mature muscle—whereas talin1 marks the focal adhesions of undifferentiated cells [#2]. Talin2 binds β1-integrin tails more strongly than talin1 owing to a unique S339–E353 hydrogen-bond network that positions talin2 N326/K327 against β1-integrin R760/D759; disrupting Ser339 (S339C or the disease variant S339L) abolishes this high-affinity binding [#7, #8]. In the heart talin2 is the dominant costameric isoform postnatally and maintains β1D-integrin levels, but its loss is tolerated through compensatory talin1 upregulation, while combined cardiomyocyte loss of both isoforms collapses costameric integrity and causes lethal dilated cardiomyopathy [#3, #4]. In cancer cells talin2 localizes to invadopodia where its high β-integrin affinity drives traction-force generation and matrix degradation required for invasion, a function talin1 cannot substitute [#7]. Talin2 is also required for myofibroblast differentiation and the pro-fibrotic program; its loss confers resistance to and reverses experimental lung and kidney fibrosis [#13]. A missense TLN2 variant p.S339L co-segregates with Fifth Finger Camptodactyly [#9]. Additional roles include modulation of tau toxicity through interaction with WWC1/KIBRA [#10] and genetic suppression of a dominant-lethal TPM1 mutation in cardiac development [#12].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that TLN2 is a distinct talin paralog rather than a talin1 variant, raising the question of isoform-specific function given its heart-enriched expression.\",\n      \"evidence\": \"Genomic assembly, EST analysis, and sequence comparison\",\n      \"pmids\": [\"11527381\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional partners or activities identified\", \"Expression pattern descriptive only\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Addressed whether talin1 and talin2 diverged functionally after duplication by showing they bind different partner sets.\",\n      \"evidence\": \"Proteomic protein-interaction profiling\",\n      \"pmids\": [\"16216449\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single screen without reciprocal validation or named interactors\", \"No functional consequence demonstrated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the spatial/temporal division of labor between paralogs: talin2 is the differentiation-induced isoform of stable muscle adhesions.\",\n      \"evidence\": \"Isoform-specific antibodies, GFP imaging, and C2C12/primary myoblast differentiation time-course\",\n      \"pmids\": [\"17183545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of costamere targeting unknown\", \"Functional necessity in muscle not yet tested by loss-of-function\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined talin2's in vivo role in the heart and revealed isoform redundancy: talin2 is the dominant postnatal costameric isoform but is dispensable due to talin1 compensation, while loss of both is lethal.\",\n      \"evidence\": \"Global and cardiomyocyte-specific single and double Tln1/Tln2 knockout mice with cardiac function, histology, and β1D-integrin quantification\",\n      \"pmids\": [\"28698364\", \"23266827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of talin1 compensatory upregulation unresolved\", \"Why integrin overexpression cannot rescue the double knockout unexplained\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Tested whole-organism necessity of talin2 with a clean null allele, showing it is largely dispensable outside muscle stress contexts.\",\n      \"evidence\": \"Complete coding-sequence deletion knockin mouse and Tln2-null MEF adhesion/migration assays\",\n      \"pmids\": [\"22925892\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mild dystrophic phenotype not mechanistically explained\", \"Possible talin1 compensation in MEFs not assessed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified the cellular function uniquely requiring talin2 — invadopodial traction force and matrix degradation — and traced it to its stronger β-integrin binding via Ser339.\",\n      \"evidence\": \"siRNA knockdown, traction force microscopy, invadopodia/matrix-degradation assays, and wild-type/S339C rescue\",\n      \"pmids\": [\"27694340\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream force-transduction partners at invadopodia not defined\", \"In vivo metastasis relevance not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked TLN2 to a human Mendelian phenotype, providing a disease handle for the Ser339 residue.\",\n      \"evidence\": \"Exome and Sanger sequencing with four-generation co-segregation and HEK293 localization\",\n      \"pmids\": [\"27223613\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional/mechanistic link between S339L and limb development\", \"Localization assay single-method\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided the structural-energetic basis for talin2's preferential β1-integrin binding, unifying the invasion and disease findings around the S339–E353 network.\",\n      \"evidence\": \"Integrin-binding affinity assays, site-directed mutagenesis, and computational molecular modeling\",\n      \"pmids\": [\"28155884\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis inferred computationally, not by direct structure determination\", \"Affinity differences not connected to cellular outputs in this study\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extended talin2 interactions beyond integrins by identifying WWC1/KIBRA as a partner that modulates tau toxicity.\",\n      \"evidence\": \"Reciprocal Co-IP in brain and HEK293, co-localization in multiple cell lines, and Drosophila tau epistasis\",\n      \"pmids\": [\"30201328\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of tau-toxicity modulation unknown\", \"Single-lab data; binding interface undefined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Implicated talin2 as a myofilament actin-binding protein capable of genetically suppressing a dominant-lethal TPM1 mutation in cardiac development.\",\n      \"evidence\": \"CRISPR double knock-in mouse with cardiac phenotype rescue and patient iPSC-derived cardiomyocytes\",\n      \"pmids\": [\"35243414\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of suppression unresolved\", \"Residual atrial septal defect unexplained\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Indicated a tumor-suppressive role in clear-cell renal carcinoma linked to Wnt/β-catenin inactivation.\",\n      \"evidence\": \"TLN2 overexpression in ccRCC cells, xenograft, cell cycle/apoptosis flow cytometry, and Wnt pathway activity assay\",\n      \"pmids\": [\"35242640\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pathway link not supported by direct molecular interaction\", \"Apparent contrast with pro-invasive role in other cancers unreconciled\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established talin2 as a driver of myofibroblast differentiation and a reversible target in organ fibrosis.\",\n      \"evidence\": \"siRNA knockdown, Tln2 knockout mice, bleomycin lung and ureteral-obstruction kidney fibrosis models, α-SMA/collagen I and secretome readouts\",\n      \"pmids\": [\"40410300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling pathway connecting talin2 to myofibroblast program undefined\", \"Mechanotransduction step driving fibrotic differentiation not pinpointed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How talin2's integrin-binding adaptor activity is mechanistically converted into context-specific outputs—pro-invasive force at invadopodia versus pro-fibrotic differentiation versus tumor suppression—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying signaling mechanism across cell types\", \"Force-sensing partners downstream of talin2 not mapped\", \"Opposing roles in different cancers not reconciled\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2, 7, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [2, 3, 4]}\n    ],\n    \"complexes\": [\"costamere\", \"intercalated disk\", \"invadopodium\"],\n    \"partners\": [\"ITGB1\", \"WWC1\", \"TPM1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}