{"gene":"FHL3","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2003,"finding":"Munc13-4 (encoded by UNC13D/FHL3 locus) is essential for the priming step of cytolytic granule secretion preceding vesicle membrane fusion in cytotoxic T lymphocytes. Mutations in hMunc13-4 cause FHL3. hMunc13-4 deficiency results in defective cytolytic granule exocytosis despite normal granule polarization and docking. Tagged hMunc13-4 localizes with cytotoxic granules at the immunological synapse.","method":"Patient mutation analysis, immunofluorescence localization of tagged protein, functional cytotoxicity assays in patient cells","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — foundational discovery paper with 691 citations, multiple orthogonal methods (genetic, cell biological, functional), replicated across 10 patients","pmids":["14622600"],"is_preprint":false},{"year":2003,"finding":"FHL3 (the LIM-domain protein) binds actin directly (confirmed by GST pull-down and co-immunoprecipitation of recombinant and endogenous proteins), localizes to actin stress fibers and focal adhesions following integrin engagement, and inhibits alpha-actinin-mediated actin bundling as demonstrated by low-speed co-sedimentation assays and electron microscopy, thereby promoting stress fiber disassembly and cell spreading.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence, low-speed actin co-sedimentation assay, electron microscopy, overexpression/wound healing assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal in vitro and cell biological methods in a single rigorous study","pmids":["12704194"],"is_preprint":false},{"year":2004,"finding":"FHL3 binds both the alpha-7 and beta-1 subunits of the muscle alpha7beta1 integrin receptor. The suprastructure of the whole FHL3 molecule (not any single LIM domain) is required for integrin binding. FHL3 colocalizes with alpha7beta1 integrin at the periphery of Z-discs in skeletal muscle, suggesting a role in mechanical stabilization.","method":"Co-immunoprecipitation, deletion mapping, immunofluorescence colocalization","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal binding studies with domain mapping, single lab","pmids":["15117962"],"is_preprint":false},{"year":2001,"finding":"FHL3 physically interacts with FHL2; LIM2 of FHL3 is the essential domain for this interaction. LIM1 of FHL3 is essential for its subcellular localization to focal adhesions. FHL2 and FHL3 colocalize in mitochondria of C2C12 cells as demonstrated by GFP-FRET.","method":"Yeast two-hybrid, site-directed mutagenesis, GFP-fusion FRET in C2C12 cells","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — FRET validates interaction in living cells, domain mapping by mutagenesis, single lab","pmids":["11135358"],"is_preprint":false},{"year":2003,"finding":"FHL3 interacts with the transcriptional repressor BKLF/KLF3 and its co-repressor CtBP2, forming a trimeric complex demonstrated by gel filtration co-elution. BKLF expression promotes nuclear accumulation of FHL3 and CtBP2. FHL3 can repress transcription in this context, contrary to its usual co-activator role.","method":"Co-immunoprecipitation, gel filtration co-elution, transcriptional reporter assays, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (gel filtration + reporter assay + localization), single lab","pmids":["12556451"],"is_preprint":false},{"year":2003,"finding":"FHL3 interacts with CDC25B2 phosphatase specifically (not other CDC25B isoforms); the second LIM domain of FHL3 is essential for this interaction. FRET in C2C12 cells shows the interaction occurs in the nucleus. FHL3 binding does not impair CDC25B2 phosphatase activity or localization.","method":"Yeast two-hybrid, deletion/point mutation analysis, FRET in C2C12 cells, phosphatase activity assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — domain mapping by mutagenesis, FRET in living cells, functional assay, single lab","pmids":["12681290"],"is_preprint":false},{"year":2007,"finding":"FHL3 binds MyoD directly (demonstrated by direct binding assays, nuclear colocalization, and GST pull-down) and functions as a potent negative co-transcriptional regulator of MyoD. FHL3 overexpression retards myotube formation and decreases myogenin (but not MyoD) expression; siRNA-mediated FHL3 knockdown enhances differentiation and MyoD transcriptional activity in a dose-dependent manner.","method":"GST pull-down, co-immunoprecipitation, immunofluorescence colocalization, siRNA knockdown, overexpression, transcriptional reporter assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, bidirectional perturbation (OE + KD) with consistent phenotypes","pmids":["17389685"],"is_preprint":false},{"year":2007,"finding":"Fhl3 is recruited by Sox15 to transcriptionally coactivate Foxk1 gene expression in myogenic progenitor cells. Sox15 binds an evolutionarily conserved site in the Foxk1 promoter and recruits Fhl3; knockdown of Sox15 decreases Foxk1 expression and perturbs cell cycle kinetics.","method":"Transgenic mouse reporter assay, chromatin binding assay, siRNA knockdown, Sox15 mutant mice with satellite cell counting","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo genetic model plus molecular coactivation assay, single lab","pmids":["17363903"],"is_preprint":false},{"year":2013,"finding":"PCBP2 binds FHL3 mRNA (identified by RIP-ChIP) and destabilizes it, suppressing FHL3 protein expression. Knockdown of PCBP2 enhances FHL3 mRNA stability and increases FHL3 protein levels. FHL3 overexpression attenuates glioma cell growth and induces apoptosis.","method":"RIP-ChIP (RNA immunoprecipitation + microarray), siRNA knockdown, overexpression, in vitro and in vivo tumor growth assays","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 — RIP-ChIP identifies interaction, functional rescue experiments, single lab","pmids":["23585479"],"is_preprint":false},{"year":2015,"finding":"FHL3 differentially regulates MyHC isoform expression: it downregulates MyHC 1/slow via inhibiting MyoD transcriptional activity, and upregulates MyHC 2a via interaction with phosphorylated CREB (pCREB). FHL3 interacts with MyoD, CREB, and pCREB in vivo; pCREB shows stronger binding to CRE of the MyHC 2a promoter than CREB, and FHL3 significantly affects pCREB binding capacity to CRE.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), transcriptional reporter assays, overexpression","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 — multiple interaction and functional assays, single lab","pmids":["26499038"],"is_preprint":false},{"year":2018,"finding":"FHL3 interacts with the Smad2/3 protein complex at the SOX4 promoter region in glioma stem cells (GSCs), recruits PPM1A phosphatase to Smad2/3, inhibits SOX4 transcriptional activity, and suppresses GSC tumor sphere formation and self-renewal via downregulation of SOX2.","method":"Co-immunoprecipitation, ChIP, transcriptional reporter assays, sphere formation assay, in vivo tumor assays, siRNA knockdown","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 — multiple molecular and functional assays, in vivo validation, single lab","pmids":["29955125"],"is_preprint":false},{"year":2020,"finding":"FHL3 directly binds GSK3β (the LIM-3 domain of FHL3 is required); this interaction weakens the association between GSK3β and Snail1/Twist1, thereby inhibiting ubiquitin-proteasome-mediated degradation of these EMT transcription factors and promoting pancreatic cancer invasion and metastasis.","method":"Co-immunoprecipitation, domain deletion mapping, GSK3β inhibitor experiments, in vitro and in vivo invasion assays","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 — domain mapping of interaction, pharmacological confirmation with GSK3β inhibitor, single lab","pmids":["31935687"],"is_preprint":false},{"year":2019,"finding":"PCBP2 inhibits FHL3 expression by binding to the FHL3 3'UTR; PCBP2 activates TGF-β/Smad signaling by suppressing FHL3, and this pathway promotes glioma development. Knockdown of FHL3 reverses the antitumor effect of PCBP2 silencing.","method":"3'UTR binding assay, siRNA knockdown, Western blot for pathway proteins, in vivo tumor assay","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 3 — mechanistic follow-up replicating PCBP2-FHL3 relationship with pathway readouts, single lab","pmids":["31693182"],"is_preprint":false},{"year":2021,"finding":"FHL3 competitively binds the ubiquitin complex (Slug/GSK3β/RNF146), preventing ubiquitination of Slug and up-regulating Slug expression, thereby promoting EMT and chemotherapy resistance in gastric cancer via MAPK/ERK and PI3K/Akt/GSK3β pathways.","method":"Co-immunoprecipitation, siRNA knockdown, overexpression, in vivo tumor xenograft, Western blot for pathway components","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 — interaction shown by Co-IP, functional rescue in vivo and in vitro, single lab","pmids":["34150617"],"is_preprint":false},{"year":2021,"finding":"Fhl3 (Xenopus ortholog) interacts with Smad1 and promotes Smad1 binding to the wnt8 promoter in a BMP-dependent manner during neural crest induction, thereby enhancing BMP signaling output and coordinating BMP-WNT signaling in neural crest development.","method":"Co-immunoprecipitation, ChIP, loss-of-function (morpholino), gain-of-function, in vivo Xenopus embryo assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP, ChIP, and in vivo genetic experiments in Xenopus, single lab","pmids":["34161771"],"is_preprint":false},{"year":2012,"finding":"FHL3 is a novel angiogenin (Ang)-binding partner identified by yeast two-hybrid screening and confirmed by co-immunoprecipitation and GST pull-down. FHL3 is required for Ang-mediated HeLa cell proliferation and nuclear translocation of Ang.","method":"Yeast two-hybrid, co-immunoprecipitation, GST pull-down, siRNA knockdown, cell proliferation assay","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2-3 — interaction confirmed by multiple biochemical methods, functional knockdown, single lab","pmids":["22633874"],"is_preprint":false},{"year":2010,"finding":"The second zinc finger motif within LIM4 of FHL3 is responsible for its transactivation activity, as determined by sequential LIM domain deletion mutants assayed in a yeast auto-activation system.","method":"Yeast transcriptional activation assay, site-directed mutagenesis, Western blot","journal":"Molekuliarnaia biologiia","confidence":"Low","confidence_rationale":"Tier 3 — yeast auto-activation assay only, no mammalian cell validation, single lab","pmids":["20586194"],"is_preprint":false},{"year":2023,"finding":"FHL3 directly interacts with the YY1 DNA-binding domain, represses YY1 binding to the MyHC2b gene regulatory region, and competes with EZH2 for binding to YY1's repression domain, thereby reducing H3K27me3 enrichment at the MyHC2b regulatory region and promoting fast glycolytic muscle fiber formation. In vivo, muscle-specific FHL3 overexpression increases fast-twitch myofiber proportion and reduces SDH activity.","method":"Co-immunoprecipitation, ChIP, transgenic mice, lentivirus-mediated overexpression/knockdown in mice and pigs","journal":"Cellular and molecular life sciences","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal molecular and in vivo methods, validated in multiple species","pmids":["36602641"],"is_preprint":false},{"year":2025,"finding":"FHL3 interacts with MAZ (MYC-associated zinc finger protein) to recruit MAZ to G-quadruplex structures in the KRAS promoter, promoting KRAS transcription and downstream oncogenic signaling in hepatocellular carcinoma. YAP transcriptionally activates FHL3 as demonstrated by luciferase reporter assay and ChIP.","method":"Co-immunoprecipitation, ChIP, luciferase reporter assay, siRNA knockdown, in vivo tumor model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — multiple molecular methods, in vivo validation, single lab","pmids":["41184244"],"is_preprint":false},{"year":2025,"finding":"AMBP competitively binds the zinc finger domain of FHL3, disrupting FHL3's protective role in preventing ubiquitin-proteasome-mediated degradation of phospho-ERK1/2 and phospho-JNK, thereby inhibiting osteoblastic differentiation of valvular interstitial cells and aortic valve calcification.","method":"Co-immunoprecipitation, AlphaFold3 structural modeling, siRNA knockdown, pharmacological inhibitors/agonists, in vivo mouse model","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP plus structural modeling plus pharmacological validation in vivo and in vitro, single lab","pmids":["40225558"],"is_preprint":false},{"year":2025,"finding":"FHL3 localizes to mitochondria-lipid droplet contact sites in HepG2 cells; suppression of FHL3 leads to reduced lipid droplet size, elongated mitochondrial morphology, and diminished mitochondria-lipid droplet interactions, suggesting a role in regulating fatty acid β-oxidation.","method":"Microscopy-guided spatial proteomics (Microscoop Mint), immunofluorescence, siRNA knockdown with organelle morphology readouts","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 — preprint, single lab, novel localization with phenotypic but not fully mechanistic follow-up","pmids":["bio_10.1101_2025.01.24.626799"],"is_preprint":true},{"year":2014,"finding":"MT-1X (Metallothionein-1X) is a novel FHL3 binding partner identified by yeast two-hybrid and confirmed by co-immunoprecipitation and GST pull-down. MT-1X knockdown promotes FHL3-induced inhibitory effects on HepG2 cells by regulating FHL3-mediated Smad signaling and G2/M phase-related protein expression.","method":"Yeast two-hybrid, co-immunoprecipitation, GST pull-down, siRNA knockdown, Western blot","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 — interaction confirmed biochemically but mechanistic follow-up is limited, single lab","pmids":["24690879"],"is_preprint":false}],"current_model":"FHL3 (the LIM-domain scaffold protein) functions as a multifunctional adaptor that regulates actin cytoskeletal dynamics (by inhibiting alpha-actinin-mediated actin bundling), muscle differentiation (by binding MyoD and acting as a transcriptional co-repressor, and interacting with YY1/CREB to control MyHC isoform expression), integrin-mediated signaling (via direct binding to alpha7beta1 integrin at Z-discs), and diverse cancer-related pathways (by modulating Smad2/3-SOX4 axis, GSK3β-ubiquitin-EMT transcription factor stability, and KRAS transcription via MAZ), while its parallelous FHL3 locus gene UNC13D/Munc13-4 acts as a vesicle-priming factor essential for cytolytic granule exocytosis at the immunological synapse, with mutations causing familial hemophagocytic lymphohistiocytosis type 3 (FHL3)."},"narrative":{"teleology":[{"year":2001,"claim":"Establishing that FHL3 physically interacts with its paralog FHL2 and that individual LIM domains dictate distinct functions — LIM1 for focal adhesion localization and LIM2 for FHL2 binding — provided the first domain-function map for FHL3.","evidence":"Yeast two-hybrid, site-directed mutagenesis, and GFP-FRET in C2C12 myoblasts","pmids":["11135358"],"confidence":"Medium","gaps":["No loss-of-function data to test functional consequence of FHL2–FHL3 interaction","Mitochondrial colocalization significance unexplored"]},{"year":2003,"claim":"Demonstrating that FHL3 directly binds actin and inhibits alpha-actinin-mediated actin bundling established it as a cytoskeletal regulator that promotes stress fiber disassembly and cell spreading.","evidence":"GST pull-down, co-immunoprecipitation, low-speed actin co-sedimentation, electron microscopy, and wound-healing assays","pmids":["12704194"],"confidence":"High","gaps":["No knockout model to confirm in vivo cytoskeletal role","Regulation of FHL3 recruitment to actin unknown"]},{"year":2003,"claim":"Identification of FHL3 as a transcriptional co-repressor in complex with BKLF/KLF3 and CtBP2, and as a nuclear interaction partner of CDC25B2, expanded FHL3's role beyond cytoskeletal scaffolding into nuclear transcriptional regulation.","evidence":"Gel filtration co-elution, transcriptional reporter assays, FRET in C2C12 cells","pmids":["12556451","12681290"],"confidence":"Medium","gaps":["Target genes co-repressed by BKLF–FHL3–CtBP2 not identified","Functional consequence of FHL3–CDC25B2 interaction remains unclear"]},{"year":2004,"claim":"Showing that FHL3 binds both alpha7 and beta1 integrin subunits and colocalizes at Z-disc periphery linked FHL3 to integrin-based mechanotransduction in skeletal muscle.","evidence":"Co-immunoprecipitation, deletion mapping, immunofluorescence in skeletal muscle","pmids":["15117962"],"confidence":"Medium","gaps":["No functional perturbation of integrin–FHL3 interaction in muscle","Whether FHL3 transmits mechanical signals remains untested"]},{"year":2007,"claim":"Bidirectional perturbation (overexpression and siRNA knockdown) established FHL3 as a potent co-repressor of MyoD that retards myotube formation, and showed it is recruited by Sox15 to coactivate Foxk1 in myogenic progenitors, revealing context-dependent transcriptional roles in muscle differentiation.","evidence":"GST pull-down, co-immunoprecipitation, reporter assays, siRNA knockdown, transgenic mouse reporter, Sox15 mutant mice","pmids":["17389685","17363903"],"confidence":"High","gaps":["How FHL3 switches between co-repressor and co-activator modes is unknown","No FHL3 conditional knockout in muscle lineage"]},{"year":2013,"claim":"Discovery that PCBP2 destabilizes FHL3 mRNA via 3′UTR binding, and that FHL3 overexpression suppresses glioma cell growth and induces apoptosis, positioned FHL3 as a post-transcriptionally regulated tumor suppressor in glioma.","evidence":"RIP-ChIP, siRNA knockdown, overexpression, in vivo tumor assays","pmids":["23585479","31693182"],"confidence":"Medium","gaps":["Direct mRNA decay mechanism not characterized","Tumor-suppressive mechanism downstream of FHL3 only partially mapped"]},{"year":2015,"claim":"Demonstrating that FHL3 differentially regulates MyHC isoforms — repressing slow MyHC 1 via MyoD inhibition and activating fast MyHC 2a via pCREB — provided a molecular framework for fiber-type specification by a single scaffold protein.","evidence":"Co-immunoprecipitation, ChIP, transcriptional reporter assays","pmids":["26499038"],"confidence":"Medium","gaps":["In vivo fiber-type switching by FHL3 not yet shown at this stage","Whether FHL3 phosphorylation status modulates CREB vs MyoD preference unknown"]},{"year":2018,"claim":"Showing that FHL3 recruits PPM1A phosphatase to dephosphorylate Smad2/3 at the SOX4 promoter, suppressing glioma stem cell self-renewal, defined a phosphatase-recruitment mechanism for FHL3's tumor-suppressive function.","evidence":"Co-immunoprecipitation, ChIP, sphere formation assay, in vivo tumor assays, siRNA knockdown","pmids":["29955125"],"confidence":"Medium","gaps":["Structural basis for PPM1A recruitment by FHL3 not determined","Whether this mechanism operates outside glioma not tested"]},{"year":2020,"claim":"Discovery that FHL3 competitively sequesters GSK3β from Snail1/Twist1, preventing their ubiquitin-mediated degradation and promoting EMT in pancreatic cancer, revealed an oncogenic role contrasting with its tumor-suppressive function in glioma.","evidence":"Co-immunoprecipitation, domain deletion mapping, GSK3β inhibitor experiments, in vivo invasion assays","pmids":["31935687"],"confidence":"Medium","gaps":["Context determinants switching FHL3 between tumor-suppressive and oncogenic roles not identified","Direct structural basis for GSK3β–LIM3 interaction unknown"]},{"year":2021,"claim":"Extension of GSK3β-sequestration mechanism to Slug/RNF146 in gastric cancer, and identification of FHL3–Smad1 interaction promoting wnt8 expression in Xenopus neural crest, demonstrated conservation of FHL3's scaffold function across Smad/GSK3β pathways and species.","evidence":"Co-immunoprecipitation, ChIP, in vivo xenograft and Xenopus morpholino experiments","pmids":["34150617","34161771"],"confidence":"Medium","gaps":["Whether BMP-dependent Smad1 interaction in neural crest is conserved in mammals unknown","Relative contribution of Slug vs Snail1 stabilization to EMT not resolved"]},{"year":2023,"claim":"In vivo demonstration that FHL3 competes with EZH2 for YY1 binding, reducing H3K27me3 at the MyHC2b locus and promoting fast glycolytic fiber formation in transgenic mice and pigs, provided the first multi-species in vivo validation of FHL3's epigenetic role in fiber-type determination.","evidence":"Co-immunoprecipitation, ChIP, muscle-specific transgenic mice, lentivirus-mediated perturbation in mice and pigs","pmids":["36602641"],"confidence":"High","gaps":["Genome-wide targets of YY1–FHL3 competition not profiled","Whether EZH2 displacement affects other loci in muscle not tested"]},{"year":2025,"claim":"Identification of FHL3 as a recruiter of MAZ to KRAS promoter G-quadruplexes in hepatocellular carcinoma, with YAP transcriptionally activating FHL3, placed FHL3 within a YAP–FHL3–MAZ–KRAS oncogenic axis.","evidence":"Co-immunoprecipitation, ChIP, luciferase reporter, siRNA knockdown, in vivo tumor model","pmids":["41184244"],"confidence":"Medium","gaps":["Direct binding of FHL3 to G-quadruplex DNA not demonstrated","Whether FHL3–MAZ interaction operates at other G4-containing promoters unknown"]},{"year":null,"claim":"A central unresolved question is how FHL3 toggles between tumor-suppressive (glioma, via Smad2/3–PPM1A) and oncogenic (pancreatic/gastric/hepatocellular carcinoma, via GSK3β sequestration and MAZ recruitment) functions, and whether cell-type-specific post-translational modifications or partner availability govern this switch.","evidence":"","pmids":[],"confidence":"Low","gaps":["No systematic post-translational modification map of FHL3","No conditional knockout in any cancer model","Structural basis for multi-partner selectivity across LIM domains unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,2]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[4,6,7,9,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[10,11,13,14,18]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,2]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,5,6,17]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,7,9,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,11,12,13,14,18]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,6,9,17,18]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,10,11,13,18]}],"complexes":["BKLF/KLF3–FHL3–CtBP2 repressor complex"],"partners":["ACTN1","MYOD1","YY1","CREB1","GSK3B","SMAD2","MAZ","FHL2"],"other_free_text":[]},"mechanistic_narrative":"FHL3 is a four-and-a-half LIM domain scaffold protein that functions as a versatile transcriptional co-regulator and cytoskeletal adaptor in muscle differentiation, development, and cancer biology. In skeletal muscle, FHL3 directly binds MyoD to co-repress myogenin transcription and retard myotube formation, while differentially regulating myosin heavy chain (MyHC) isoform expression through interactions with phosphorylated CREB at the MyHC 2a promoter and with YY1/EZH2 at the MyHC 2b locus, where it competes with EZH2 for YY1 binding to reduce H3K27me3 and promote fast-twitch fiber specification [PMID:17389685, PMID:26499038, PMID:36602641]. At the cytoskeletal level, FHL3 binds actin directly, inhibits alpha-actinin-mediated actin bundling to promote stress fiber disassembly, and localizes to focal adhesions and Z-discs through interaction with alpha7beta1 integrin [PMID:12704194, PMID:15117962]. In cancer contexts, FHL3 modulates TGF-β/Smad signaling by recruiting PPM1A phosphatase to Smad2/3 at the SOX4 promoter in glioma stem cells, stabilizes EMT transcription factors Snail1/Twist1/Slug by sequestering GSK3β away from ubiquitin ligase complexes, and promotes KRAS transcription by recruiting MAZ to G-quadruplex structures in hepatocellular carcinoma [PMID:29955125, PMID:31935687, PMID:34150617, PMID:41184244]."},"prefetch_data":{"uniprot":{"accession":"Q13643","full_name":"Four and a half LIM domains protein 3","aliases":["Skeletal muscle LIM-protein 2","SLIM-2"],"length_aa":280,"mass_kda":31.2,"function":"Recruited by SOX15 to FOXK1 promoters where it acts as a transcriptional coactivator of FOXK1","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q13643/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FHL3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/FHL3","total_profiled":1310},"omim":[{"mim_id":"613101","title":"HEMOPHAGOCYTIC LYMPHOHISTIOCYTOSIS, FAMILIAL, 5, WITH OR WITHOUT MICROVILLUS INCLUSION DISEASE; FHL5","url":"https://www.omim.org/entry/613101"},{"mim_id":"612659","title":"REGULATORY FACTOR X, 6; RFX6","url":"https://www.omim.org/entry/612659"},{"mim_id":"608898","title":"HEMOPHAGOCYTIC LYMPHOHISTIOCYTOSIS, FAMILIAL, 3; FHL3","url":"https://www.omim.org/entry/608898"},{"mim_id":"608897","title":"UNC13 HOMOLOG D; UNC13D","url":"https://www.omim.org/entry/608897"},{"mim_id":"602790","title":"FOUR-AND-A-HALF LIM DOMAINS 3; FHL3","url":"https://www.omim.org/entry/602790"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skeletal muscle","ntpm":1501.5},{"tissue":"tongue","ntpm":752.0}],"url":"https://www.proteinatlas.org/search/FHL3"},"hgnc":{"alias_symbol":["SLIM2"],"prev_symbol":[]},"alphafold":{"accession":"Q13643","domains":[{"cath_id":"2.10.110.10","chopping":"20-96","consensus_level":"medium","plddt":92.6651,"start":20,"end":96},{"cath_id":"2.10.110.10","chopping":"163-216","consensus_level":"medium","plddt":94.2141,"start":163,"end":216},{"cath_id":"2.10.110.10","chopping":"219-279","consensus_level":"medium","plddt":90.0082,"start":219,"end":279}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13643","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13643-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13643-F1-predicted_aligned_error_v6.png","plddt_mean":91.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FHL3","jax_strain_url":"https://www.jax.org/strain/search?query=FHL3"},"sequence":{"accession":"Q13643","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13643.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13643/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13643"}},"corpus_meta":[{"pmid":"14622600","id":"PMC_14622600","title":"Munc13-4 is essential for cytolytic granules fusion and is mutated in a form of familial hemophagocytic lymphohistiocytosis (FHL3).","date":"2003","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/14622600","citation_count":691,"is_preprint":false},{"pmid":"21931115","id":"PMC_21931115","title":"Familial hemophagocytic lymphohistiocytosis type 3 (FHL3) caused by deep intronic mutation and inversion in UNC13D.","date":"2011","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/21931115","citation_count":96,"is_preprint":false},{"pmid":"23585479","id":"PMC_23585479","title":"RNA-binding protein PCBP2 modulates glioma growth by regulating FHL3.","date":"2013","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/23585479","citation_count":93,"is_preprint":false},{"pmid":"15117962","id":"PMC_15117962","title":"The LIM-only proteins FHL2 and FHL3 interact with alpha- and beta-subunits of the muscle alpha7beta1 integrin receptor.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15117962","citation_count":91,"is_preprint":false},{"pmid":"12704194","id":"PMC_12704194","title":"FHL3 is an actin-binding protein that regulates alpha-actinin-mediated actin bundling: FHL3 localizes to actin stress fibers and enhances cell spreading and stress fiber disassembly.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12704194","citation_count":76,"is_preprint":false},{"pmid":"10049693","id":"PMC_10049693","title":"The LIM proteins FHL1 and FHL3 are expressed differently in skeletal muscle.","date":"1999","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/10049693","citation_count":74,"is_preprint":false},{"pmid":"17363903","id":"PMC_17363903","title":"Sox15 and Fhl3 transcriptionally coactivate Foxk1 and regulate myogenic progenitor cells.","date":"2007","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/17363903","citation_count":66,"is_preprint":false},{"pmid":"11135358","id":"PMC_11135358","title":"Protein-protein interaction of FHL3 with FHL2 and visualization of their interaction by green fluorescent proteins (GFP) two-fusion fluorescence resonance energy transfer (FRET).","date":"2001","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11135358","citation_count":57,"is_preprint":false},{"pmid":"12556451","id":"PMC_12556451","title":"The LIM protein FHL3 binds basic Krüppel-like factor/Krüppel-like factor 3 and its co-repressor C-terminal-binding protein 2.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12556451","citation_count":48,"is_preprint":false},{"pmid":"17389685","id":"PMC_17389685","title":"FHL3 binds MyoD and negatively regulates myotube formation.","date":"2007","source":"Journal of cell 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Mutations in hMunc13-4 cause FHL3. hMunc13-4 deficiency results in defective cytolytic granule exocytosis despite normal granule polarization and docking. Tagged hMunc13-4 localizes with cytotoxic granules at the immunological synapse.\",\n      \"method\": \"Patient mutation analysis, immunofluorescence localization of tagged protein, functional cytotoxicity assays in patient cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — foundational discovery paper with 691 citations, multiple orthogonal methods (genetic, cell biological, functional), replicated across 10 patients\",\n      \"pmids\": [\"14622600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"FHL3 (the LIM-domain protein) binds actin directly (confirmed by GST pull-down and co-immunoprecipitation of recombinant and endogenous proteins), localizes to actin stress fibers and focal adhesions following integrin engagement, and inhibits alpha-actinin-mediated actin bundling as demonstrated by low-speed co-sedimentation assays and electron microscopy, thereby promoting stress fiber disassembly and cell spreading.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence, low-speed actin co-sedimentation assay, electron microscopy, overexpression/wound healing assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal in vitro and cell biological methods in a single rigorous study\",\n      \"pmids\": [\"12704194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"FHL3 binds both the alpha-7 and beta-1 subunits of the muscle alpha7beta1 integrin receptor. The suprastructure of the whole FHL3 molecule (not any single LIM domain) is required for integrin binding. FHL3 colocalizes with alpha7beta1 integrin at the periphery of Z-discs in skeletal muscle, suggesting a role in mechanical stabilization.\",\n      \"method\": \"Co-immunoprecipitation, deletion mapping, immunofluorescence colocalization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding studies with domain mapping, single lab\",\n      \"pmids\": [\"15117962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"FHL3 physically interacts with FHL2; LIM2 of FHL3 is the essential domain for this interaction. LIM1 of FHL3 is essential for its subcellular localization to focal adhesions. FHL2 and FHL3 colocalize in mitochondria of C2C12 cells as demonstrated by GFP-FRET.\",\n      \"method\": \"Yeast two-hybrid, site-directed mutagenesis, GFP-fusion FRET in C2C12 cells\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — FRET validates interaction in living cells, domain mapping by mutagenesis, single lab\",\n      \"pmids\": [\"11135358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"FHL3 interacts with the transcriptional repressor BKLF/KLF3 and its co-repressor CtBP2, forming a trimeric complex demonstrated by gel filtration co-elution. BKLF expression promotes nuclear accumulation of FHL3 and CtBP2. FHL3 can repress transcription in this context, contrary to its usual co-activator role.\",\n      \"method\": \"Co-immunoprecipitation, gel filtration co-elution, transcriptional reporter assays, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (gel filtration + reporter assay + localization), single lab\",\n      \"pmids\": [\"12556451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"FHL3 interacts with CDC25B2 phosphatase specifically (not other CDC25B isoforms); the second LIM domain of FHL3 is essential for this interaction. FRET in C2C12 cells shows the interaction occurs in the nucleus. FHL3 binding does not impair CDC25B2 phosphatase activity or localization.\",\n      \"method\": \"Yeast two-hybrid, deletion/point mutation analysis, FRET in C2C12 cells, phosphatase activity assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping by mutagenesis, FRET in living cells, functional assay, single lab\",\n      \"pmids\": [\"12681290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"FHL3 binds MyoD directly (demonstrated by direct binding assays, nuclear colocalization, and GST pull-down) and functions as a potent negative co-transcriptional regulator of MyoD. FHL3 overexpression retards myotube formation and decreases myogenin (but not MyoD) expression; siRNA-mediated FHL3 knockdown enhances differentiation and MyoD transcriptional activity in a dose-dependent manner.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation, immunofluorescence colocalization, siRNA knockdown, overexpression, transcriptional reporter assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, bidirectional perturbation (OE + KD) with consistent phenotypes\",\n      \"pmids\": [\"17389685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Fhl3 is recruited by Sox15 to transcriptionally coactivate Foxk1 gene expression in myogenic progenitor cells. Sox15 binds an evolutionarily conserved site in the Foxk1 promoter and recruits Fhl3; knockdown of Sox15 decreases Foxk1 expression and perturbs cell cycle kinetics.\",\n      \"method\": \"Transgenic mouse reporter assay, chromatin binding assay, siRNA knockdown, Sox15 mutant mice with satellite cell counting\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model plus molecular coactivation assay, single lab\",\n      \"pmids\": [\"17363903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PCBP2 binds FHL3 mRNA (identified by RIP-ChIP) and destabilizes it, suppressing FHL3 protein expression. Knockdown of PCBP2 enhances FHL3 mRNA stability and increases FHL3 protein levels. FHL3 overexpression attenuates glioma cell growth and induces apoptosis.\",\n      \"method\": \"RIP-ChIP (RNA immunoprecipitation + microarray), siRNA knockdown, overexpression, in vitro and in vivo tumor growth assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP-ChIP identifies interaction, functional rescue experiments, single lab\",\n      \"pmids\": [\"23585479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FHL3 differentially regulates MyHC isoform expression: it downregulates MyHC 1/slow via inhibiting MyoD transcriptional activity, and upregulates MyHC 2a via interaction with phosphorylated CREB (pCREB). FHL3 interacts with MyoD, CREB, and pCREB in vivo; pCREB shows stronger binding to CRE of the MyHC 2a promoter than CREB, and FHL3 significantly affects pCREB binding capacity to CRE.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), transcriptional reporter assays, overexpression\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple interaction and functional assays, single lab\",\n      \"pmids\": [\"26499038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FHL3 interacts with the Smad2/3 protein complex at the SOX4 promoter region in glioma stem cells (GSCs), recruits PPM1A phosphatase to Smad2/3, inhibits SOX4 transcriptional activity, and suppresses GSC tumor sphere formation and self-renewal via downregulation of SOX2.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, transcriptional reporter assays, sphere formation assay, in vivo tumor assays, siRNA knockdown\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple molecular and functional assays, in vivo validation, single lab\",\n      \"pmids\": [\"29955125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FHL3 directly binds GSK3β (the LIM-3 domain of FHL3 is required); this interaction weakens the association between GSK3β and Snail1/Twist1, thereby inhibiting ubiquitin-proteasome-mediated degradation of these EMT transcription factors and promoting pancreatic cancer invasion and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion mapping, GSK3β inhibitor experiments, in vitro and in vivo invasion assays\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping of interaction, pharmacological confirmation with GSK3β inhibitor, single lab\",\n      \"pmids\": [\"31935687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PCBP2 inhibits FHL3 expression by binding to the FHL3 3'UTR; PCBP2 activates TGF-β/Smad signaling by suppressing FHL3, and this pathway promotes glioma development. Knockdown of FHL3 reverses the antitumor effect of PCBP2 silencing.\",\n      \"method\": \"3'UTR binding assay, siRNA knockdown, Western blot for pathway proteins, in vivo tumor assay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — mechanistic follow-up replicating PCBP2-FHL3 relationship with pathway readouts, single lab\",\n      \"pmids\": [\"31693182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FHL3 competitively binds the ubiquitin complex (Slug/GSK3β/RNF146), preventing ubiquitination of Slug and up-regulating Slug expression, thereby promoting EMT and chemotherapy resistance in gastric cancer via MAPK/ERK and PI3K/Akt/GSK3β pathways.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, overexpression, in vivo tumor xenograft, Western blot for pathway components\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — interaction shown by Co-IP, functional rescue in vivo and in vitro, single lab\",\n      \"pmids\": [\"34150617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Fhl3 (Xenopus ortholog) interacts with Smad1 and promotes Smad1 binding to the wnt8 promoter in a BMP-dependent manner during neural crest induction, thereby enhancing BMP signaling output and coordinating BMP-WNT signaling in neural crest development.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, loss-of-function (morpholino), gain-of-function, in vivo Xenopus embryo assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ChIP, and in vivo genetic experiments in Xenopus, single lab\",\n      \"pmids\": [\"34161771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"FHL3 is a novel angiogenin (Ang)-binding partner identified by yeast two-hybrid screening and confirmed by co-immunoprecipitation and GST pull-down. FHL3 is required for Ang-mediated HeLa cell proliferation and nuclear translocation of Ang.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, GST pull-down, siRNA knockdown, cell proliferation assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — interaction confirmed by multiple biochemical methods, functional knockdown, single lab\",\n      \"pmids\": [\"22633874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The second zinc finger motif within LIM4 of FHL3 is responsible for its transactivation activity, as determined by sequential LIM domain deletion mutants assayed in a yeast auto-activation system.\",\n      \"method\": \"Yeast transcriptional activation assay, site-directed mutagenesis, Western blot\",\n      \"journal\": \"Molekuliarnaia biologiia\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — yeast auto-activation assay only, no mammalian cell validation, single lab\",\n      \"pmids\": [\"20586194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FHL3 directly interacts with the YY1 DNA-binding domain, represses YY1 binding to the MyHC2b gene regulatory region, and competes with EZH2 for binding to YY1's repression domain, thereby reducing H3K27me3 enrichment at the MyHC2b regulatory region and promoting fast glycolytic muscle fiber formation. In vivo, muscle-specific FHL3 overexpression increases fast-twitch myofiber proportion and reduces SDH activity.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, transgenic mice, lentivirus-mediated overexpression/knockdown in mice and pigs\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal molecular and in vivo methods, validated in multiple species\",\n      \"pmids\": [\"36602641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FHL3 interacts with MAZ (MYC-associated zinc finger protein) to recruit MAZ to G-quadruplex structures in the KRAS promoter, promoting KRAS transcription and downstream oncogenic signaling in hepatocellular carcinoma. YAP transcriptionally activates FHL3 as demonstrated by luciferase reporter assay and ChIP.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, luciferase reporter assay, siRNA knockdown, in vivo tumor model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple molecular methods, in vivo validation, single lab\",\n      \"pmids\": [\"41184244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AMBP competitively binds the zinc finger domain of FHL3, disrupting FHL3's protective role in preventing ubiquitin-proteasome-mediated degradation of phospho-ERK1/2 and phospho-JNK, thereby inhibiting osteoblastic differentiation of valvular interstitial cells and aortic valve calcification.\",\n      \"method\": \"Co-immunoprecipitation, AlphaFold3 structural modeling, siRNA knockdown, pharmacological inhibitors/agonists, in vivo mouse model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus structural modeling plus pharmacological validation in vivo and in vitro, single lab\",\n      \"pmids\": [\"40225558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FHL3 localizes to mitochondria-lipid droplet contact sites in HepG2 cells; suppression of FHL3 leads to reduced lipid droplet size, elongated mitochondrial morphology, and diminished mitochondria-lipid droplet interactions, suggesting a role in regulating fatty acid β-oxidation.\",\n      \"method\": \"Microscopy-guided spatial proteomics (Microscoop Mint), immunofluorescence, siRNA knockdown with organelle morphology readouts\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — preprint, single lab, novel localization with phenotypic but not fully mechanistic follow-up\",\n      \"pmids\": [\"bio_10.1101_2025.01.24.626799\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MT-1X (Metallothionein-1X) is a novel FHL3 binding partner identified by yeast two-hybrid and confirmed by co-immunoprecipitation and GST pull-down. MT-1X knockdown promotes FHL3-induced inhibitory effects on HepG2 cells by regulating FHL3-mediated Smad signaling and G2/M phase-related protein expression.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, GST pull-down, siRNA knockdown, Western blot\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — interaction confirmed biochemically but mechanistic follow-up is limited, single lab\",\n      \"pmids\": [\"24690879\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FHL3 (the LIM-domain scaffold protein) functions as a multifunctional adaptor that regulates actin cytoskeletal dynamics (by inhibiting alpha-actinin-mediated actin bundling), muscle differentiation (by binding MyoD and acting as a transcriptional co-repressor, and interacting with YY1/CREB to control MyHC isoform expression), integrin-mediated signaling (via direct binding to alpha7beta1 integrin at Z-discs), and diverse cancer-related pathways (by modulating Smad2/3-SOX4 axis, GSK3β-ubiquitin-EMT transcription factor stability, and KRAS transcription via MAZ), while its parallelous FHL3 locus gene UNC13D/Munc13-4 acts as a vesicle-priming factor essential for cytolytic granule exocytosis at the immunological synapse, with mutations causing familial hemophagocytic lymphohistiocytosis type 3 (FHL3).\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FHL3 is a four-and-a-half LIM domain scaffold protein that functions as a versatile transcriptional co-regulator and cytoskeletal adaptor in muscle differentiation, development, and cancer biology. In skeletal muscle, FHL3 directly binds MyoD to co-repress myogenin transcription and retard myotube formation, while differentially regulating myosin heavy chain (MyHC) isoform expression through interactions with phosphorylated CREB at the MyHC 2a promoter and with YY1/EZH2 at the MyHC 2b locus, where it competes with EZH2 for YY1 binding to reduce H3K27me3 and promote fast-twitch fiber specification [PMID:17389685, PMID:26499038, PMID:36602641]. At the cytoskeletal level, FHL3 binds actin directly, inhibits alpha-actinin-mediated actin bundling to promote stress fiber disassembly, and localizes to focal adhesions and Z-discs through interaction with alpha7beta1 integrin [PMID:12704194, PMID:15117962]. In cancer contexts, FHL3 modulates TGF-β/Smad signaling by recruiting PPM1A phosphatase to Smad2/3 at the SOX4 promoter in glioma stem cells, stabilizes EMT transcription factors Snail1/Twist1/Slug by sequestering GSK3β away from ubiquitin ligase complexes, and promotes KRAS transcription by recruiting MAZ to G-quadruplex structures in hepatocellular carcinoma [PMID:29955125, PMID:31935687, PMID:34150617, PMID:41184244].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing that FHL3 physically interacts with its paralog FHL2 and that individual LIM domains dictate distinct functions — LIM1 for focal adhesion localization and LIM2 for FHL2 binding — provided the first domain-function map for FHL3.\",\n      \"evidence\": \"Yeast two-hybrid, site-directed mutagenesis, and GFP-FRET in C2C12 myoblasts\",\n      \"pmids\": [\"11135358\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No loss-of-function data to test functional consequence of FHL2–FHL3 interaction\", \"Mitochondrial colocalization significance unexplored\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrating that FHL3 directly binds actin and inhibits alpha-actinin-mediated actin bundling established it as a cytoskeletal regulator that promotes stress fiber disassembly and cell spreading.\",\n      \"evidence\": \"GST pull-down, co-immunoprecipitation, low-speed actin co-sedimentation, electron microscopy, and wound-healing assays\",\n      \"pmids\": [\"12704194\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No knockout model to confirm in vivo cytoskeletal role\", \"Regulation of FHL3 recruitment to actin unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of FHL3 as a transcriptional co-repressor in complex with BKLF/KLF3 and CtBP2, and as a nuclear interaction partner of CDC25B2, expanded FHL3's role beyond cytoskeletal scaffolding into nuclear transcriptional regulation.\",\n      \"evidence\": \"Gel filtration co-elution, transcriptional reporter assays, FRET in C2C12 cells\",\n      \"pmids\": [\"12556451\", \"12681290\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Target genes co-repressed by BKLF–FHL3–CtBP2 not identified\", \"Functional consequence of FHL3–CDC25B2 interaction remains unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showing that FHL3 binds both alpha7 and beta1 integrin subunits and colocalizes at Z-disc periphery linked FHL3 to integrin-based mechanotransduction in skeletal muscle.\",\n      \"evidence\": \"Co-immunoprecipitation, deletion mapping, immunofluorescence in skeletal muscle\",\n      \"pmids\": [\"15117962\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional perturbation of integrin–FHL3 interaction in muscle\", \"Whether FHL3 transmits mechanical signals remains untested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Bidirectional perturbation (overexpression and siRNA knockdown) established FHL3 as a potent co-repressor of MyoD that retards myotube formation, and showed it is recruited by Sox15 to coactivate Foxk1 in myogenic progenitors, revealing context-dependent transcriptional roles in muscle differentiation.\",\n      \"evidence\": \"GST pull-down, co-immunoprecipitation, reporter assays, siRNA knockdown, transgenic mouse reporter, Sox15 mutant mice\",\n      \"pmids\": [\"17389685\", \"17363903\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How FHL3 switches between co-repressor and co-activator modes is unknown\", \"No FHL3 conditional knockout in muscle lineage\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery that PCBP2 destabilizes FHL3 mRNA via 3′UTR binding, and that FHL3 overexpression suppresses glioma cell growth and induces apoptosis, positioned FHL3 as a post-transcriptionally regulated tumor suppressor in glioma.\",\n      \"evidence\": \"RIP-ChIP, siRNA knockdown, overexpression, in vivo tumor assays\",\n      \"pmids\": [\"23585479\", \"31693182\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mRNA decay mechanism not characterized\", \"Tumor-suppressive mechanism downstream of FHL3 only partially mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrating that FHL3 differentially regulates MyHC isoforms — repressing slow MyHC 1 via MyoD inhibition and activating fast MyHC 2a via pCREB — provided a molecular framework for fiber-type specification by a single scaffold protein.\",\n      \"evidence\": \"Co-immunoprecipitation, ChIP, transcriptional reporter assays\",\n      \"pmids\": [\"26499038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo fiber-type switching by FHL3 not yet shown at this stage\", \"Whether FHL3 phosphorylation status modulates CREB vs MyoD preference unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showing that FHL3 recruits PPM1A phosphatase to dephosphorylate Smad2/3 at the SOX4 promoter, suppressing glioma stem cell self-renewal, defined a phosphatase-recruitment mechanism for FHL3's tumor-suppressive function.\",\n      \"evidence\": \"Co-immunoprecipitation, ChIP, sphere formation assay, in vivo tumor assays, siRNA knockdown\",\n      \"pmids\": [\"29955125\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis for PPM1A recruitment by FHL3 not determined\", \"Whether this mechanism operates outside glioma not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Discovery that FHL3 competitively sequesters GSK3β from Snail1/Twist1, preventing their ubiquitin-mediated degradation and promoting EMT in pancreatic cancer, revealed an oncogenic role contrasting with its tumor-suppressive function in glioma.\",\n      \"evidence\": \"Co-immunoprecipitation, domain deletion mapping, GSK3β inhibitor experiments, in vivo invasion assays\",\n      \"pmids\": [\"31935687\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Context determinants switching FHL3 between tumor-suppressive and oncogenic roles not identified\", \"Direct structural basis for GSK3β–LIM3 interaction unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extension of GSK3β-sequestration mechanism to Slug/RNF146 in gastric cancer, and identification of FHL3–Smad1 interaction promoting wnt8 expression in Xenopus neural crest, demonstrated conservation of FHL3's scaffold function across Smad/GSK3β pathways and species.\",\n      \"evidence\": \"Co-immunoprecipitation, ChIP, in vivo xenograft and Xenopus morpholino experiments\",\n      \"pmids\": [\"34150617\", \"34161771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether BMP-dependent Smad1 interaction in neural crest is conserved in mammals unknown\", \"Relative contribution of Slug vs Snail1 stabilization to EMT not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"In vivo demonstration that FHL3 competes with EZH2 for YY1 binding, reducing H3K27me3 at the MyHC2b locus and promoting fast glycolytic fiber formation in transgenic mice and pigs, provided the first multi-species in vivo validation of FHL3's epigenetic role in fiber-type determination.\",\n      \"evidence\": \"Co-immunoprecipitation, ChIP, muscle-specific transgenic mice, lentivirus-mediated perturbation in mice and pigs\",\n      \"pmids\": [\"36602641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide targets of YY1–FHL3 competition not profiled\", \"Whether EZH2 displacement affects other loci in muscle not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of FHL3 as a recruiter of MAZ to KRAS promoter G-quadruplexes in hepatocellular carcinoma, with YAP transcriptionally activating FHL3, placed FHL3 within a YAP–FHL3–MAZ–KRAS oncogenic axis.\",\n      \"evidence\": \"Co-immunoprecipitation, ChIP, luciferase reporter, siRNA knockdown, in vivo tumor model\",\n      \"pmids\": [\"41184244\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding of FHL3 to G-quadruplex DNA not demonstrated\", \"Whether FHL3–MAZ interaction operates at other G4-containing promoters unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A central unresolved question is how FHL3 toggles between tumor-suppressive (glioma, via Smad2/3–PPM1A) and oncogenic (pancreatic/gastric/hepatocellular carcinoma, via GSK3β sequestration and MAZ recruitment) functions, and whether cell-type-specific post-translational modifications or partner availability govern this switch.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No systematic post-translational modification map of FHL3\", \"No conditional knockout in any cancer model\", \"Structural basis for multi-partner selectivity across LIM domains unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [4, 6, 7, 9, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [10, 11, 13, 14, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 5, 6, 17]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 7, 9, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 11, 12, 13, 14, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 6, 9, 17, 18]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 10, 11, 13, 18]}\n    ],\n    \"complexes\": [\n      \"BKLF/KLF3–FHL3–CtBP2 repressor complex\"\n    ],\n    \"partners\": [\n      \"ACTN1\",\n      \"MYOD1\",\n      \"YY1\",\n      \"CREB1\",\n      \"GSK3B\",\n      \"SMAD2\",\n      \"MAZ\",\n      \"FHL2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}