{"gene":"LAMC1","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1999,"finding":"Homologous recombination knockout of LAMC1 (laminin gamma1) in mouse embryonic stem cells demonstrated that the gamma1 subunit is necessary for laminin heterotrimer assembly; without LAMC1, no basement membranes form, and collagen IV, perlecan, and nidogen are not incorporated into extracellular matrix. Embryos die at E5.5 due to failure of primitive endoderm differentiation, while the first epithelium (trophectoderm) can form independently of basement membrane.","method":"Homologous recombination knockout in mouse ES cells; embryoid body culture; immunofluorescence; ECM protein localization assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — loss-of-function genetic knockout with multiple orthogonal readouts (in vivo embryo and in vitro embryoid body), replicated across conditions","pmids":["9885251","9917858"],"is_preprint":false},{"year":1997,"finding":"The transcription factor Sp1 directly transactivates the LAMC1 promoter via GC-rich elements; Sp1 overexpression in normal hepatocytes increases laminin gamma1 mRNA, and co-expression of Sp1 and laminin gamma1 is observed in human hepatocellular carcinomas at the invasion front.","method":"DNase I hypersensitive site mapping; gel-shift (EMSA) assays; Sp1 expression vector transfection; co-transfection of LAMC1 promoter deletion constructs in Drosophila SL2 cells; Northern blot; in situ hybridization","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (EMSA, transfection, in situ hybridization) in a single study with functional validation","pmids":["9403717"],"is_preprint":false},{"year":1996,"finding":"Regulatory elements controlling LAMC1 expression in hepatocytes are located between -594 bp and -94 bp of the promoter and contain GC- and CTC-containing motifs; a ~60 kDa protein binds the CTC motif and is implicated in transcriptional activation of LAMC1 in hepatoma cells and cultured hepatocytes.","method":"Transfection of LAMC1 promoter deletion mutants; actinomycin D/cycloheximide treatment; gel-shift assay; affinity chromatography; Southwestern analysis","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods in single lab; identity of 60 kDa CTC-binding protein not fully characterized","pmids":["8611150"],"is_preprint":false},{"year":2013,"finding":"Structural modeling of the NID1-LAMC1 complex showed that a LAMC1 mutation identified in a family with autosomal dominant Dandy-Walker malformation disrupts the NID1-LAMC1 protein-protein interaction, implicating this ECM interaction in cerebellar development.","method":"Whole-exome sequencing; protein interaction network analysis; structural modeling of NID1-LAMC1 complex","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 3 — structural modeling with human genetic validation but no direct biochemical reconstitution of the interaction disruption","pmids":["23674478"],"is_preprint":false},{"year":2014,"finding":"miR-29s (miR-29a/b/c) directly target the 3'UTR of LAMC1, as confirmed by luciferase reporter assays; restoration of miR-29s in prostate cancer cells inhibits cell migration and invasion, and silencing of LAMC1 phenocopies this effect, placing LAMC1 downstream of miR-29s in the focal adhesion pathway governing prostate cancer metastasis.","method":"Luciferase reporter assays; siRNA knockdown of LAMC1; migration/invasion assays; gene expression profiling; in silico target prediction","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct 3'UTR validation by luciferase assay plus functional phenotypic rescue, single lab","pmids":["24820027"],"is_preprint":false},{"year":2015,"finding":"miR-22 and miR-29a are directly regulated by the androgen receptor (AR) via AR binding sites identified by ChIP-seq; miR-22 directly targets LAMC1 (validated by luciferase reporter), and transfection of miR-22 mimics in prostate cancer cells reduces LAMC1 expression, induces apoptosis, and diminishes cell migration.","method":"ChIP-seq; microarray expression profiling; luciferase reporter assay; miRNA mimic transfection; apoptosis and migration assays","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq plus luciferase validation plus functional phenotype, single lab","pmids":["26052614"],"is_preprint":false},{"year":2019,"finding":"LAMC1 promotes the Warburg effect in hepatocellular carcinoma cells by upregulating PKM2 expression through the PTEN/AKT signaling pathway; LAMC1 knockdown reduces glucose consumption and lactate production, decreases GLUT1 and LDHA expression, increases PTEN, and reduces AKT phosphorylation, while PI3K inhibition blocks LAMC1-induced PKM2 upregulation.","method":"siRNA knockdown and overexpression of LAMC1; PI3K inhibitor (LY294002); glucose/lactate measurement; Western blotting for GLUT1, LDHA, PTEN, p-AKT, PKM2","journal":"Cancer biology & therapy","confidence":"Medium","confidence_rationale":"Tier 2-3 — pharmacological and genetic perturbation with metabolic readouts, single lab","pmids":["30755064"],"is_preprint":false},{"year":2021,"finding":"TGFβ1 upregulates LAMC1 in esophageal squamous cell carcinoma cells through synergistic activation by SMAD4 and SP1; LAMC1 in turn promotes tumor cell proliferation and migration via Akt-NFκB-MMP9/14 signaling, and induces CXCL1 secretion that stimulates formation of inflammatory cancer-associated fibroblasts (iCAF) through CXCR2-pSTAT3.","method":"RNA sequencing; ChIP; luciferase reporter assay; siRNA knockdown; co-culture model; Western blotting; ELISA for CXCL1","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (ChIP, luciferase, co-culture) establishing pathway position, single lab","pmids":["34218518"],"is_preprint":false},{"year":2022,"finding":"LAMC1 secreted by gastric cancer cells in an autocrine manner promotes preadipocyte maturation and rupture to release free fatty acids (FFAs) in peritoneal microenvironment; palmitic acid (a FFA) activates p-STAT3, which binds the miR-193a-3p promoter to inhibit miR-193a-3p, thereby de-repressing LAMC1 in a post-translational regulatory loop; single-molecular magnetic tweezers confirmed the STAT3-promoter binding is stable, reversible, and ATP-dependent.","method":"Co-culture model; luciferase reporter; RNA immunoprecipitation (RIP); ChIP; single-molecular magnetic tweezers; immunohistochemical staining; single-cell sequencing","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods including biophysical validation, single lab","pmids":["35541892"],"is_preprint":false},{"year":2012,"finding":"Mutation of a critical binding site in Lamc1 (laminin gamma1) disrupts cortical lamination in mice, implicating LAMC1-containing laminins as ECM ligands required for pial basement membrane integrity, radial glial cell attachment, and cortical neuron migration.","method":"Mouse genetic model (Lamc1 binding-site mutation); histological analysis of cortical layers; immunofluorescence for dystroglycan and radial glia markers","journal":"Developmental neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo genetic model with multiple cellular readouts, though mechanistic detail on binding partner is indirect","pmids":["22961762"],"is_preprint":false},{"year":2006,"finding":"A sequence variant (rs10911193) in the LAMC1 promoter disrupts the binding site for transcription factor NFIL3; the rare T allele segregates with early-onset pelvic organ prolapse in affected families, and NFIL3 was verified to be co-expressed with LAMC1 in vaginal tissue, suggesting NFIL3-driven LAMC1 regulation contributes to connective tissue integrity.","method":"Genome-wide linkage scan; RT-PCR; SNP genotyping; promoter sequence analysis identifying NFIL3 binding site","journal":"Human genetics","confidence":"Low","confidence_rationale":"Tier 3-4 — genetic association with bioinformatic identification of TF binding site; no direct functional demonstration of NFIL3-LAMC1 transcriptional regulation","pmids":["17021862"],"is_preprint":false},{"year":2017,"finding":"LAMC1 mRNA acts as a competing endogenous RNA (ceRNA) for miR-124 in hepatocellular carcinoma; miR-124 negatively regulates LAMC1 through two binding sites in its 3'UTR, and the wild-type LAMC1 miRNA response elements (MREs) competitively sponge miR-124 to facilitate CD151 expression, thereby promoting HCC cell migration and invasion.","method":"Luciferase reporter assay with 3'UTR constructs; miR-124 overexpression; siRNA knockdown; qRT-PCR; correlation analysis in clinical tissues","journal":"IUBMB life","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct 3'UTR binding validated, ceRNA mechanism demonstrated functionally, single lab","pmids":["28524360"],"is_preprint":false},{"year":2021,"finding":"LncRNA SNHG6 acts as a sponge for miR-543 to disinhibit LAMC1; miR-543 directly targets LAMC1 (validated by dual-luciferase assay), and LAMC1 promotes breast cancer cell proliferation, migration, invasion, and EMT via activation of the PI3K/AKT pathway; overexpression of LAMC1 reverses the tumor-suppressive effects of miR-543.","method":"Dual-luciferase reporter assay; siRNA knockdown; colony formation; flow cytometry; wound healing; transwell assay; xenograft model; Western blotting for PI3K/AKT pathway","journal":"Breast cancer research and treatment","confidence":"Medium","confidence_rationale":"Tier 2-3 — luciferase validation plus in vivo xenograft, single lab","pmids":["33782812"],"is_preprint":false},{"year":2022,"finding":"Exosomal miR-424-5p from ER-stressed head and neck squamous cell carcinoma cells directly targets LAMC1 (validated by luciferase reporter and Western blot), inhibiting angiogenesis and migration of HUVECs through repression of the LAMC1-mediated Wnt/β-catenin signaling pathway.","method":"Exosome isolation/characterization; RNA-seq; matrigel tube formation assay; transwell assay; luciferase reporter assay; Western blotting","journal":"Cell transplantation","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct target validation plus pathway-level functional readout, single lab","pmids":["35315295"],"is_preprint":false},{"year":2024,"finding":"LAMC1 attenuates neuronal apoptosis after subarachnoid hemorrhage via the FAK/PI3K/AKT signaling pathway; recombinant LAMC1 increases p-FAK, p-PI3K, p-AKT, Bcl-XL, and Bcl-2 and decreases Bax and cleaved caspase-3; knockdown of LAMC1 worsens neurological deficits; pharmacological inhibition of FAK (Y15) or PI3K (LY294002) abolishes rLAMC1's protective effects.","method":"Rat endovascular perforation SAH model; intranasal rLAMC1 administration; siRNA knockdown; FAK inhibitor Y15; PI3K inhibitor LY294002; Western blotting; TUNEL staining; immunofluorescence; neurobehavioral testing; in vitro oxyhemoglobin model","journal":"Experimental neurology","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological epistasis plus genetic KD, both in vitro and in vivo, single lab","pmids":["38609046"],"is_preprint":false},{"year":2023,"finding":"NUDT21-mediated alternative polyadenylation (APA) regulates LAMC1 expression in glioma; NUDT21 knockdown causes preferential use of the proximal polyA signal of LAMC1, shortening the 3'UTR and removing miR-124/506 binding sites, thereby increasing LAMC1 protein via relief of miRNA-based repression; co-depletion of LAMC1 abolishes the pro-migratory effect of NUDT21 knockdown.","method":"PAC-seq; PolyAMiner bioinformatic pipeline; qRT-PCR; Western blotting; glioma cell migration assays; NUDT21 and LAMC1 knockdown","journal":"Journal of neuro-oncology","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic link between APA, 3'UTR shortening, and protein upregulation validated with functional rescue, single lab","pmids":["37389756"],"is_preprint":false},{"year":2020,"finding":"miR-183 inhibits embryo implantation in mice by binding directly to Lamc1 (laminin gamma1) and Hbegf mRNAs; in vivo uterine delivery of miR-183 agomir reduces implantation sites, and loss/gain of miR-183 function in endometrial cells shows inhibition of cell migration, invasion, and apoptosis, placing Lamc1 as a key target of miR-183 in uterine receptivity.","method":"In vivo miRNA agomir treatment; in vitro gain/loss of function; identification of miR-183 binding to Lamc1; mouse implantation model","journal":"Theriogenology","confidence":"Low","confidence_rationale":"Tier 3 — functional in vivo and in vitro data but direct binding to Lamc1 3'UTR not validated by luciferase assay in this paper","pmids":["32980684"],"is_preprint":false},{"year":2022,"finding":"LAMC1 intronic variant rs3768617 associated with Fuchs endothelial corneal dystrophy shows allele-specific binding of transcription factor GFI1B to the risk allele 'G' (but not protective allele 'A'), as validated by EMSA and ChIP assay; luciferase assay confirmed the locus has regulatory activity; GFI1B expression is reduced in FECD-affected corneal endothelium.","method":"Genotyping; luciferase assay; EMSA; ChIP assay; immunofluorescence; bioinformatics","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — EMSA and ChIP provide direct evidence of allele-specific TF binding at LAMC1 regulatory region","pmids":["35031421"],"is_preprint":false},{"year":2024,"finding":"In hyperglycemic endothelial cells, protein disulfide isomerase A1 (PDI) regulates secretion of LAMC1; siRNA knockdown of LAMC1 decreased platelet-endothelium interaction and did not potentiate PDI inhibitor effects, establishing LAMC1 as a downstream effector of PDI-dependent pathways controlling endothelial membrane stiffness and platelet adhesion.","method":"Secretomics (proteomics of conditioned medium); siRNA knockdown; immunofluorescence; atomic force microscopy; transendothelial resistance assay; PDI inhibitors","journal":"Journal of thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 — proteomics plus genetic knockdown with functional biophysical readout, single lab","pmids":["39128656"],"is_preprint":false},{"year":2025,"finding":"Astrocyte-derived LAMC1 preserves blood-brain barrier integrity after intracerebral hemorrhage by inhibiting degradation of tight junction proteins ZO-1 and occludin; AAV-mediated LAMC1 overexpression in mice reduced brain edema, tissue necrosis, and improved neuromotor function post-ICH; single-cell eQTL analysis pinpointed astrocytes as the key cell type driving LAMC1's protective effects.","method":"Multi-omics integration (TWAS, PWAS); single-cell eQTL; AAV gain-of-function in vivo; Evans Blue extravasation; brain edema measurement; Western blotting for ZO-1, occludin; neurobehavioral testing","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo gain-of-function with mechanistic readout (tight junction protein degradation), supported by multi-omics, single lab","pmids":["41534552"],"is_preprint":false},{"year":2025,"finding":"LAMC1 knockdown in lung adenocarcinoma cell lines decreases radioresistance, affecting proliferation and apoptosis following irradiation; LAMC1 protein levels in exosomes decrease following radiotherapy, identifying it as a functional determinant of radiation resistance.","method":"DIA-mass spectrometry proteomics; siRNA knockdown; surviving fraction at 2 Gy assay; nano-flow cytometry for exosomal LAMC1","journal":"Current pharmaceutical design","confidence":"Low","confidence_rationale":"Tier 3 — proteomics discovery followed by siRNA functional validation, single lab, mechanism not fully resolved","pmids":["40326033"],"is_preprint":false},{"year":2025,"finding":"LAMC1 promotes epithelial-mesenchymal transition (EMT) and retinal pigment epithelial cell migration/invasion in diabetic retinopathy via activation of the PI3K/AKT signaling pathway; LAMC1 is upregulated in high-glucose-treated ARPE-19 cells and diabetic mouse retinas, and LAMC1 knockdown alleviates retinal damage in diabetic mice.","method":"GEO microarray dataset analysis; Western blotting; in vitro high-glucose model; siRNA knockdown; in vivo diabetic mouse model; EMT marker analysis","journal":"The journal of physiological sciences","confidence":"Low","confidence_rationale":"Tier 3 — functional knockdown with in vivo validation but PI3K/AKT pathway placement is pharmacological correlation, single lab","pmids":["41092639"],"is_preprint":false},{"year":2024,"finding":"Lamc1 promotes osteogenic differentiation and inhibits adipogenic differentiation of bone marrow-derived mesenchymal stem cells; knockdown of Lamc1 inhibits both adipogenic and osteogenic differentiation, and cell communication analysis identified two receptors interacting with LAMC1 in this context.","method":"Transcriptomic analysis of public datasets; single-cell RNA-seq validation; q-PCR; siRNA knockdown of Lamc1","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 — knockdown phenotype with single method, largely bioinformatic with limited mechanistic depth","pmids":["39179716"],"is_preprint":false},{"year":2025,"finding":"Live imaging of endogenous zebrafish Lamc1 tagged at the C-terminus by in-fusion genome editing showed that Lamc1 is stable in fin fold matrix but more dynamic (as measured by FRAP) in myoseptal matrix, revealing tissue-specific turnover dynamics of LAMC1 in vivo.","method":"C-terminus in-fusion genome editing (knock-in); confocal live-cell imaging; FRAP analysis in developing zebrafish","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — endogenous tagging with FRAP providing direct subcellular/matrix dynamics data; preprint but novel ortholog finding","pmids":[],"is_preprint":true},{"year":1994,"finding":"LAMC1 was established as the gene encoding the laminin gamma1 chain (previously called B2 chain), which together with alpha and beta chains forms the heterotrimeric laminin molecule; the new nomenclature formalized the gene symbol LAMC1 for this subunit.","method":"Nomenclature consensus based on biochemical and molecular characterization of laminin chain composition","journal":"Matrix biology","confidence":"High","confidence_rationale":"Tier 1-2 — community consensus based on prior biochemical reconstitution of laminin heterotrimers; foundational gene identity","pmids":["7921537"],"is_preprint":false},{"year":1989,"finding":"S-laminin (encoded by LAMB2, but establishing the paradigm for laminin chain-specific synaptic localization) was identified as a glycoprotein selectively concentrated in synaptic basal lamina that is recognized by motoneurons and promotes synaptic specificity — establishing the principle that individual laminin chains confer isoform-specific tissue localization.","method":"Biochemical isolation; immunohistochemistry; molecular cloning","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — foundational biochemical and molecular cloning study; highly cited; establishes laminin chain biology relevant to gamma1","pmids":["2922051"],"is_preprint":false},{"year":2011,"finding":"Basement membranes are self-assembled on cell surfaces through binding interactions among laminins (including gamma1-containing isoforms), type IV collagens, nidogens, and proteoglycans; laminins serve as the nucleating scaffold for this assembly, with gamma1 being present in most laminin isoforms and essential for this organization.","method":"Review synthesizing biochemical reconstitution and genetic studies of basement membrane assembly","journal":"Cold Spring Harbor perspectives in biology","confidence":"High","confidence_rationale":"Tier 1 — synthesizes reconstitution and genetic data establishing LAMC1's role in BM scaffold nucleation","pmids":["21421915"],"is_preprint":false},{"year":2024,"finding":"LncRNA TM4SF19-AS1 upregulates LAMC1 expression in head and neck squamous cell carcinoma by two mechanisms: (1) sequestering miR-153-3p (which targets LAMC1) as a ceRNA sponge, and (2) recruiting HNRNPC protein to enhance LAMC1 expression; knockdown of TM4SF19-AS1 reduces LAMC1 and inhibits HNSCC proliferation, migration, invasion, and EMT.","method":"RT-qPCR; Western blotting; luciferase reporter assay; RNA immunoprecipitation for HNRNPC; siRNA knockdown; in vivo tumor assays","journal":"Cancer biology & therapy","confidence":"Medium","confidence_rationale":"Tier 2-3 — two-mechanism validation (ceRNA sponge + HNRNPC recruitment) with functional rescue, single lab","pmids":["36411963"],"is_preprint":false}],"current_model":"LAMC1 encodes laminin gamma1, a subunit essential for heterotrimeric laminin assembly and basement membrane nucleation; loss of LAMC1 abolishes BM formation and causes embryonic lethality at E5.5 due to endoderm differentiation failure, while its expression is transcriptionally driven by Sp1 and NFIL3 via GC/CTC-rich promoter elements, and post-transcriptionally regulated by multiple miRNAs (miR-29s, miR-22, miR-124, miR-506, miR-543) via 3'UTR binding and by NUDT21-controlled alternative polyadenylation that modulates miRNA accessibility; functionally, LAMC1 promotes cell migration, invasion, and survival in cancer and injury contexts through activation of FAK/PI3K/AKT, Akt-NFκB-MMP9/14, Wnt/β-catenin, and PTEN/AKT-PKM2 signaling pathways, and preserves blood-brain barrier integrity by stabilizing tight junction proteins ZO-1 and occludin."},"narrative":{"teleology":[{"year":1994,"claim":"Establishing gene identity: consensus nomenclature formalized LAMC1 as the gene encoding the laminin gamma-1 chain (formerly B2), a constitutive subunit of most heterotrimeric laminin isoforms, resolving prior naming ambiguities.","evidence":"Community nomenclature based on prior biochemical characterization of laminin chain composition","pmids":["7921537"],"confidence":"High","gaps":["Chain-specific functional contributions versus other gamma chains not yet delineated"]},{"year":1999,"claim":"Answering whether LAMC1 is required for basement membrane formation: knockout demonstrated that without gamma-1, no laminin heterotrimers assemble, no basement membranes form, and embryos die at E5.5 — establishing LAMC1 as the indispensable nucleation scaffold for BM biogenesis.","evidence":"Homologous recombination knockout in mouse ES cells; embryoid body culture; immunofluorescence for ECM components; in vivo embryo analysis","pmids":["9885251","9917858"],"confidence":"High","gaps":["Whether any compensatory gamma chain can partially substitute in specific tissues","Mechanism by which trophectoderm forms without BM remains unresolved"]},{"year":1997,"claim":"Defining transcriptional control: Sp1 was identified as a direct transactivator of the LAMC1 promoter via GC-rich elements, explaining upregulation at the invasion front of hepatocellular carcinomas and linking transcriptional regulation to cancer biology.","evidence":"EMSA; Sp1 transfection in Drosophila SL2 cells; LAMC1 promoter deletion constructs; Northern blot; in situ hybridization in human HCC tissue","pmids":["9403717","8611150"],"confidence":"High","gaps":["Identity of the ~60 kDa CTC-binding factor remains unconfirmed","Chromatin-level regulation (enhancers, epigenetic marks) largely unexplored at this stage"]},{"year":2012,"claim":"Demonstrating tissue-specific developmental roles: mutation of a critical binding site in Lamc1 disrupted pial basement membrane integrity and cortical lamination, establishing that specific LAMC1 interaction surfaces are required for radial glial attachment and neuronal migration in cortical development.","evidence":"Mouse genetic model with Lamc1 binding-site mutation; histological analysis; immunofluorescence for dystroglycan and radial glia markers","pmids":["22961762"],"confidence":"Medium","gaps":["Precise receptor(s) mediating radial glial attachment to LAMC1-containing laminins not identified","Whether other laminin isoforms contribute redundantly to pial BM not tested"]},{"year":2013,"claim":"Linking LAMC1 to human brain malformation: structural modeling showed a LAMC1 mutation in a Dandy–Walker malformation family disrupts the nidogen-1 binding interface, connecting a specific protein–protein interaction to cerebellar development.","evidence":"Whole-exome sequencing; structural modeling of NID1-LAMC1 complex; protein interaction network analysis","pmids":["23674478"],"confidence":"Medium","gaps":["No biochemical reconstitution demonstrating disrupted NID1 binding","No animal model recapitulating the human mutation phenotype"]},{"year":2014,"claim":"Establishing post-transcriptional regulation by miRNAs: miR-29a/b/c were shown to directly target the LAMC1 3′UTR, and silencing LAMC1 phenocopied miR-29 restoration in suppressing prostate cancer migration and invasion — opening an axis of miRNA-based LAMC1 regulation that was subsequently extended to miR-22, miR-124, miR-506, and miR-543.","evidence":"Luciferase reporter assays; siRNA knockdown; migration/invasion assays in prostate cancer cells; extended by miR-22 ChIP-seq and luciferase validation (2015), miR-124 ceRNA studies (2017), miR-543 dual-luciferase assays (2021), and NUDT21-APA studies (2023)","pmids":["24820027","26052614","28524360","33782812","37389756"],"confidence":"Medium","gaps":["Quantitative contribution of each miRNA to LAMC1 protein levels in vivo is unknown","Whether miRNA regulation of LAMC1 is relevant in non-cancer contexts remains largely untested"]},{"year":2019,"claim":"Mapping downstream signaling: LAMC1 was placed upstream of PI3K/AKT in hepatocellular carcinoma, where it drives the Warburg effect through PTEN suppression and PKM2 upregulation — the first detailed pathway placement connecting LAMC1 to cancer cell metabolism.","evidence":"siRNA knockdown and overexpression; PI3K inhibitor LY294002; glucose/lactate measurements; Western blotting for PTEN, p-AKT, PKM2","pmids":["30755064"],"confidence":"Medium","gaps":["How an extracellular matrix subunit activates intracellular PTEN/AKT not mechanistically resolved","No receptor identified mediating the signal"]},{"year":2021,"claim":"Revealing LAMC1 as a paracrine signaling hub: TGFβ1-induced LAMC1 in esophageal SCC not only activates Akt–NF-κB–MMP9/14 in tumor cells but also induces CXCL1 secretion that reprograms fibroblasts into inflammatory CAFs via CXCR2-pSTAT3, linking LAMC1 to tumor microenvironment remodeling.","evidence":"RNA-seq; ChIP; luciferase reporter; co-culture model; Western blotting; CXCL1 ELISA","pmids":["34218518"],"confidence":"Medium","gaps":["Whether LAMC1's paracrine effects require its incorporation into a laminin trimer or act as a monomer is unresolved","Mechanism connecting LAMC1 to CXCL1 transcription not delineated"]},{"year":2024,"claim":"Establishing a neuroprotective role: recombinant LAMC1 attenuates neuronal apoptosis after subarachnoid hemorrhage through FAK/PI3K/AKT, while astrocyte-derived LAMC1 preserves blood–brain barrier integrity by stabilizing ZO-1 and occludin — extending LAMC1 function from structural ECM roles to active signaling in neurological injury.","evidence":"Rat SAH model with intranasal rLAMC1; FAK/PI3K inhibitors; AAV overexpression in mouse ICH model; Evans Blue extravasation; Western blotting for tight junction proteins","pmids":["38609046","41534552"],"confidence":"Medium","gaps":["Receptor through which LAMC1 activates FAK in neurons not identified","Whether LAMC1 acts as an assembled laminin trimer or free subunit in these injury models is unclear","Therapeutic window and translational relevance in human stroke unknown"]},{"year":null,"claim":"Major unresolved question: the cell-surface receptor(s) mediating LAMC1-dependent intracellular signaling (FAK, PI3K/AKT, Wnt/β-catenin) have not been definitively identified, and whether signaling-competent LAMC1 must be assembled into a laminin heterotrimer or can function as a free chain remains mechanistically open.","evidence":"","pmids":[],"confidence":"High","gaps":["No receptor identification for LAMC1-driven intracellular signaling","No structural data on LAMC1 alone versus in assembled trimer context","In vivo tissue-specific contribution of LAMC1 to individual laminin isoform functions not systematically resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,24,26]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,9,26]}],"localization":[{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[0,9,23,26]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,18,26]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[0,9,26]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,12,14]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,9]}],"complexes":["Laminin heterotrimer (alpha-beta-gamma)"],"partners":["NID1","SP1","SMAD4","NUDT21","HNRNPC","COL4A1"],"other_free_text":[]},"mechanistic_narrative":"LAMC1 encodes laminin subunit gamma-1, the most widely expressed gamma chain of the heterotrimeric laminin family, and serves as the essential nucleating scaffold for basement membrane assembly; genetic knockout in mice abolishes laminin heterotrimer formation, prevents incorporation of collagen IV, nidogen, and perlecan into the extracellular matrix, and causes embryonic lethality at E5.5 due to failure of primitive endoderm differentiation [PMID:9885251, PMID:21421915]. LAMC1 transcription is driven by Sp1 and SMAD4 via GC-rich promoter elements, while its protein output is post-transcriptionally tuned by multiple miRNAs (miR-29a/b/c, miR-22, miR-124, miR-506, miR-543) and by NUDT21-controlled alternative polyadenylation that modulates 3′UTR length and miRNA accessibility [PMID:9403717, PMID:24820027, PMID:37389756, PMID:34218518]. Functionally, LAMC1 promotes cell migration, invasion, survival, and epithelial–mesenchymal transition across multiple tissue contexts through activation of FAK/PI3K/AKT, Akt–NF-κB–MMP9/14, and Wnt/β-catenin signaling, and preserves blood–brain barrier integrity by stabilizing tight-junction proteins ZO-1 and occludin [PMID:38609046, PMID:33782812, PMID:35315295, PMID:41534552]. A LAMC1 mutation disrupting the nidogen-1 interaction surface has been identified in autosomal dominant Dandy–Walker malformation [PMID:23674478]."},"prefetch_data":{"uniprot":{"accession":"P11047","full_name":"Laminin subunit gamma-1","aliases":["Laminin B2 chain","Laminin-1 subunit gamma","Laminin-10 subunit gamma","Laminin-11 subunit gamma","Laminin-2 subunit gamma","Laminin-3 subunit gamma","Laminin-4 subunit gamma","Laminin-6 subunit gamma","Laminin-7 subunit gamma","Laminin-8 subunit gamma","Laminin-9 subunit gamma","S-laminin subunit gamma","S-LAM gamma"],"length_aa":1609,"mass_kda":177.6,"function":"Binding to cells via a high affinity receptor, laminin is thought to mediate the attachment, migration and organization of cells into tissues during embryonic development by interacting with other extracellular matrix components. 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perlecan) cannot be deposited in the extracellular matrix. Nidogen, which normally binds the γ1 chain, is almost completely lost from the embryoid body. Loss of LAMC1 results in embryonic lethality at E5.5 due to failure of extra-embryonic endoderm differentiation, while the first epithelium forms independently of a basement membrane.\",\n      \"method\": \"Homologous recombination knockout in mouse ES cells; embryoid body culture; immunofluorescence/Western blot for basement membrane proteins (collagen IV, perlecan, nidogen, laminin α1)\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — clean KO with multiple orthogonal molecular readouts, foundational study replicated conceptually across the field\",\n      \"pmids\": [\"9885251\", \"9917858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The transcription factor Sp1 directly transactivates the LAMC1 promoter via GC-rich cis-elements; Sp1 overexpression in normal hepatocytes increases laminin-γ1 mRNA, and Sp1 and LAMC1 are co-expressed at high levels in human hepatocellular carcinomas.\",\n      \"method\": \"DNase I hypersensitive site mapping; gel-shift (EMSA); co-transfection of Sp1 expression vector in hepatocytes; promoter deletion reporter assays in Drosophila SL2 cells; in situ hybridization\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple orthogonal methods (EMSA, reporter assay, mutagenesis-equivalent deletions, in situ hybridization) in a single study\",\n      \"pmids\": [\"9403717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"LAMC1 promoter activity in hepatocytes is controlled by repeated CTC and GC elements; a ~60 kDa nuclear protein binds the CTC motif and is implicated in transcriptional activation. The pattern of nuclear factor binding differs between freshly isolated hepatocytes (low LAMC1) and cultured hepatocytes or hepatoma cells (high LAMC1), consistent with transcriptional regulation.\",\n      \"method\": \"Promoter deletion transfection; gel-shift (EMSA); Southwestern blot; affinity chromatography; actinomycin D / cycloheximide pulse experiments; Northern blot\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods in single lab study; binding protein not fully identified\",\n      \"pmids\": [\"8611150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mutations in LAMC1 (encoding a NID1-binding partner) cause autosomal dominant Dandy-Walker malformation and occipital cephaloceles; structural modeling of the NID1-LAMC1 complex showed that the LAMC1 mutation disrupts the NID1–LAMC1 interaction, implicating this ECM protein–protein interaction in posterior fossa brain development.\",\n      \"method\": \"Whole-exome sequencing; protein interaction network analysis; structural modeling of NID1-LAMC1 complex\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic identification plus computational structural modeling; no in vitro binding validation\",\n      \"pmids\": [\"23674478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-29s directly target the LAMC1 3′UTR (validated by luciferase reporter assay) and suppress LAMC1 expression; silencing LAMC1 inhibits prostate cancer cell migration and invasion, placing LAMC1 downstream of miR-29-regulated focal adhesion signaling.\",\n      \"method\": \"Luciferase reporter assay; siRNA knockdown; migration/invasion (Transwell) assays; gene expression profiling\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3′UTR targeting validated by luciferase + functional KD phenotype\",\n      \"pmids\": [\"24820027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Androgen receptor (AR) directly drives expression of miR-22 and miR-29a; these miRNAs in turn directly repress LAMC1 (validated by luciferase reporter). AR-driven suppression of miR-22/miR-29a thus de-represses LAMC1, contributing to prostate cancer migration and viability.\",\n      \"method\": \"ChIP-seq (AR binding to miR-22/miR-29a loci); microarray expression; luciferase reporter for miRNA targeting of LAMC1; miRNA mimic transfection with phenotypic readouts\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP-seq plus luciferase validation plus functional rescue across multiple orthogonal methods\",\n      \"pmids\": [\"26052614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LAMC1 promotes the Warburg effect in hepatocellular carcinoma by regulating PKM2 expression through the PTEN/PI3K/AKT pathway; LAMC1 knockdown decreased AKT phosphorylation, reduced GLUT1/LDHA expression and glucose consumption/lactate production, while PKM2 overexpression counteracted these effects.\",\n      \"method\": \"siRNA knockdown and overexpression; PI3K inhibitor (LY294002) treatment; Western blot for PTEN, p-AKT, PKM2, GLUT1, LDHA; glucose/lactate assays; cell death/proliferation assays\",\n      \"journal\": \"Cancer biology & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological and genetic perturbation with multiple molecular readouts in single lab\",\n      \"pmids\": [\"30755064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TGFβ1 upregulates LAMC1 in esophageal squamous cell carcinoma via synergistic activation by SMAD4 and SP1; LAMC1 promotes tumor cell proliferation and migration via Akt-NF-κB-MMP9/14 signaling and stimulates CXCL1 secretion, which drives formation of inflammatory cancer-associated fibroblasts (iCAF) through CXCR2-pSTAT3.\",\n      \"method\": \"TCGA/RNA microarray analysis; TGFβ1 stimulation assays; ChIP and luciferase reporter for SMAD4/SP1 on LAMC1 promoter; siRNA knockdown; migration/proliferation assays; Western blot for Akt, NF-κB, MMP9/14; ELISA for CXCL1; co-culture model\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in single lab establishing upstream regulation and downstream signaling\",\n      \"pmids\": [\"34218518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LAMC1 mRNA acts as a competing endogenous RNA (ceRNA) by sequestering miR-124 through two binding sites in its 3′UTR, thereby relieving miR-124-mediated repression of CD151 and promoting hepatocellular carcinoma malignancy. miR-124 suppresses HCC cell migration and invasion by targeting LAMC1.\",\n      \"method\": \"Luciferase reporter (LAMC1 3′UTR miR-124 binding sites); siRNA knockdown of LAMC1; co-expression analysis in clinical tissues; migration/invasion assays\",\n      \"journal\": \"IUBMB life\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3′UTR binding validated by luciferase plus functional ceRNA mechanism demonstrated\",\n      \"pmids\": [\"28524360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NUDT21 knockdown causes 3′UTR shortening of LAMC1 via alternative polyadenylation (proximal PAS usage), removing miR-124/506 binding sites and relieving miRNA-based repression, leading to increased LAMC1 protein and enhanced glioma cell migration. Co-depletion of LAMC1 with NUDT21 abolished the pro-migratory effect.\",\n      \"method\": \"PAC-seq APA profiling; qRT-PCR; Western blot; siRNA knockdown (NUDT21, LAMC1); migration assays; functional rescue experiments\",\n      \"journal\": \"Journal of neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (double KD rescue) plus molecular mechanism (APA-mediated miRNA site loss) in single study\",\n      \"pmids\": [\"37389756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Exogenous recombinant LAMC1 attenuates neuronal apoptosis after subarachnoid hemorrhage via the FAK/PI3K/AKT pathway; rLAMC1 increased p-FAK, p-PI3K, p-AKT, Bcl-XL, and Bcl-2 while decreasing Bax and cleaved caspase-3. FAK inhibitor Y15 and PI3K inhibitor LY294002 abolished the protective effects, establishing pathway position.\",\n      \"method\": \"Rat SAH model (endovascular perforation); intranasal rLAMC1 administration; LAMC1 siRNA knockdown; pharmacological inhibition (Y15, LY294002); Western blot; TUNEL; immunofluorescence; neurobehavioral tests; in vitro HT22 cell model\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KD + pharmacological epistasis + gain-of-function in both in vivo and in vitro models\",\n      \"pmids\": [\"38609046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Astrocyte-derived LAMC1, secreted via exosomes in a connexin 47 (Cx47)-dependent manner, promotes oligodendrocyte precursor cell (OPC) proliferation by activating cyclin D1 and driving S-phase entry.\",\n      \"method\": \"Cx47 siRNA; transmission electron microscopy and nanoparticle tracking of exosomes; mass spectrometry of exosome cargo; exogenous LAMC1 supplementation; Western blot for cyclin D1; BrdU/cell cycle analysis\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mass spectrometry identification of LAMC1 in exosomes plus functional rescue with exogenous LAMC1 and cyclin D1 readout\",\n      \"pmids\": [\"35596050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LAMC1 promotes EMT in retinal pigment epithelial cells and contributes to diabetic retinopathy progression via PI3K/AKT pathway activation; LAMC1 knockdown in vivo alleviated retinal damage in diabetic mice.\",\n      \"method\": \"Microarray dataset analysis; Western blot in high-glucose-treated ARPE-19 cells and diabetic mouse retinas; siRNA knockdown in vitro; in vivo diabetic mouse model with retinal phenotyping; PI3K/AKT pathway assays\",\n      \"journal\": \"The journal of physiological sciences : JPS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — combined in vitro and in vivo KD with pathway validation\",\n      \"pmids\": [\"41092639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LAMC1 preserves blood-brain barrier integrity after intracerebral hemorrhage by inhibiting degradation of tight junction proteins ZO-1 and occludin; AAV-mediated LAMC1 overexpression in a mouse ICH model attenuated brain edema, tissue necrosis, and improved neuromotor function.\",\n      \"method\": \"Multi-omics (TWAS, PWAS, single-cell eQTL); collagenase-induced mouse ICH model; AAV gain-of-function (retro-orbital injection); Evans Blue extravasation; brain edema measurement; Western blot for ZO-1, occludin; neurobehavioral testing\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gain-of-function with mechanistic protein readout; single lab study\",\n      \"pmids\": [\"41534552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In hyperglycemic endothelial cells, LAMC1 (secreted in a PDI-dependent manner) contributes to increased platelet-endothelium interaction and membrane stiffness; siRNA-mediated LAMC1 knockdown decreased platelet adhesion to hyperglycemic HUVECs without potentiating PDI inhibitor effects.\",\n      \"method\": \"Secretomics/proteomics; immunofluorescence; atomic force microscopy; siRNA knockdown of LAMC1; Amplex Red H2O2 assay; transendothelial resistance; platelet adhesion assay\",\n      \"journal\": \"Journal of thrombosis and haemostasis : JTH\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — secretomics identification plus siRNA functional validation with multiple biophysical readouts\",\n      \"pmids\": [\"39128656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Zebrafish Lamc1 (ortholog of mammalian LAMC1) tagged at its C-terminus via knock-in showed stable incorporation in fin fold matrix but more dynamic turnover in myoseptal matrix, as determined by FRAP analysis, revealing tissue-specific ECM stability differences for laminin γ1.\",\n      \"method\": \"C-terminus in-fusion genome editing knock-in in zebrafish; fluorescence live imaging; FRAP (fluorescence recovery after photobleaching)\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct endogenous tagging with FRAP quantification; preprint, single study\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In gastric cancer, tumor cell-secreted LAMC1 acts in an autocrine manner to facilitate detachment from primary sites and in a paracrine manner to promote preadipocyte differentiation and rupture, releasing free fatty acids (FFAs) that form a pre-metastatic niche; palmitic acid (a released FFA) activates STAT3, which suppresses miR-193a-3p, and miR-193a-3p post-translationally regulates LAMC1, forming a feedback loop.\",\n      \"method\": \"Co-culture model; luciferase reporter; RNA immunoprecipitation (RIP); ChIP; single-molecular magnetic tweezers; IHC; siRNA knockdown; single-cell sequencing\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including RIP, ChIP, and single-molecule assays in single lab study\",\n      \"pmids\": [\"35541892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-183 directly binds and suppresses LAMC1 in the mouse uterus, impairing endometrial cell migration/invasion and embryo implantation; in vivo agomir delivery of miR-183 before implantation eliminated implantation sites.\",\n      \"method\": \"In vivo miR-183 agomir uterine injection; luciferase reporter assay (miR-183 targeting Lamc1 3′UTR); loss/gain-of-function in endometrial cell lines; implantation site counting\",\n      \"journal\": \"Theriogenology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3′UTR binding validated in vitro plus in vivo functional consequence\",\n      \"pmids\": [\"32980684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Lamc1 promotes osteogenic differentiation and inhibits adipogenic differentiation of bone marrow-derived mesenchymal stem cells (BMSCs); Lamc1 knockdown inhibited both osteogenic and adipogenic differentiation. Cell communication analysis identified two receptors interacting with LAMC1 in this context.\",\n      \"method\": \"Transcriptomic analysis of public datasets; single-cell RNA-seq; q-PCR validation; siRNA knockdown with osteogenic/adipogenic differentiation assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, KD phenotype without detailed pathway mechanism\",\n      \"pmids\": [\"39179716\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LAMC1 encodes the laminin γ1 subunit, which is essential for laminin heterotrimer assembly and basement membrane formation (without it, collagen IV, perlecan, and nidogen cannot be deposited in the ECM); its promoter is transactivated by Sp1 and SMAD4/SP1 downstream of TGFβ; once present in the ECM, LAMC1 engages FAK/PI3K/AKT and Akt-NF-κB-MMP signaling to promote cell survival, migration, and EMT, regulates Warburg metabolism through PTEN/AKT/PKM2, maintains blood-brain barrier tight junctions (ZO-1, occludin), and its expression is post-transcriptionally controlled by multiple miRNAs (miR-29s, miR-22, miR-124, miR-183, miR-506) through direct 3′UTR binding, as well as by alternative polyadenylation via NUDT21.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries only from KEEP papers.\n\n**Classification:**\n- Papers about LAMC1 (laminin gamma1): KEEP\n- Papers about LAMB2 (laminin beta2): EXCLUDE (different gene, alias collision risk — LAMB2 is a paralog, not LAMC1)\n- Papers about general proteomics/interactomes without LAMC1-specific findings: EXCLUDE\n- Papers about lncRNAs/circRNAs using LAMC1 as a downstream target (ceRNA axis): These describe LAMC1 protein regulation, so KEEP for the LAMC1-specific mechanistic findings\n- The zebrafish preprint (LAMC1 ortholog, Lamc1): KEEP (ortholog)\n\n**EXCLUDE list:** Papers 2,3,4,5,13,14,16,21,23,29,31,33 (LAMB2-focused), 36,37,39,40,41,43,44,47,53,54,55,57,60,63,64,66,67,69,70,71,73 (LAMB2), and from gene2pubmed: papers that are purely general proteomics resources (papers g1,g2,g3,g4,g5,g6,g7,g8,g10,g12,g13,g16,g17,g18,g19,g20,g21,g22,g24,g26,g27,g28,g29,g30 without specific LAMC1 mechanistic findings).\n\n**KEEP:** 1,6,7,8,9,11,12,15,17,18,19,20,22,24,25,26,27,28,30,32,34,38,45,46,48,49,51,52,56,58,59,61,62,65,68,72,74,75,76 + gene2pubmed g9,g10,g14,g23,g25\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"Homologous recombination knockout of LAMC1 (laminin gamma1) in mouse embryonic stem cells demonstrated that the gamma1 subunit is necessary for laminin heterotrimer assembly; without LAMC1, no basement membranes form, and collagen IV, perlecan, and nidogen are not incorporated into extracellular matrix. Embryos die at E5.5 due to failure of primitive endoderm differentiation, while the first epithelium (trophectoderm) can form independently of basement membrane.\",\n      \"method\": \"Homologous recombination knockout in mouse ES cells; embryoid body culture; immunofluorescence; ECM protein localization assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — loss-of-function genetic knockout with multiple orthogonal readouts (in vivo embryo and in vitro embryoid body), replicated across conditions\",\n      \"pmids\": [\"9885251\", \"9917858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The transcription factor Sp1 directly transactivates the LAMC1 promoter via GC-rich elements; Sp1 overexpression in normal hepatocytes increases laminin gamma1 mRNA, and co-expression of Sp1 and laminin gamma1 is observed in human hepatocellular carcinomas at the invasion front.\",\n      \"method\": \"DNase I hypersensitive site mapping; gel-shift (EMSA) assays; Sp1 expression vector transfection; co-transfection of LAMC1 promoter deletion constructs in Drosophila SL2 cells; Northern blot; in situ hybridization\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (EMSA, transfection, in situ hybridization) in a single study with functional validation\",\n      \"pmids\": [\"9403717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Regulatory elements controlling LAMC1 expression in hepatocytes are located between -594 bp and -94 bp of the promoter and contain GC- and CTC-containing motifs; a ~60 kDa protein binds the CTC motif and is implicated in transcriptional activation of LAMC1 in hepatoma cells and cultured hepatocytes.\",\n      \"method\": \"Transfection of LAMC1 promoter deletion mutants; actinomycin D/cycloheximide treatment; gel-shift assay; affinity chromatography; Southwestern analysis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods in single lab; identity of 60 kDa CTC-binding protein not fully characterized\",\n      \"pmids\": [\"8611150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Structural modeling of the NID1-LAMC1 complex showed that a LAMC1 mutation identified in a family with autosomal dominant Dandy-Walker malformation disrupts the NID1-LAMC1 protein-protein interaction, implicating this ECM interaction in cerebellar development.\",\n      \"method\": \"Whole-exome sequencing; protein interaction network analysis; structural modeling of NID1-LAMC1 complex\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — structural modeling with human genetic validation but no direct biochemical reconstitution of the interaction disruption\",\n      \"pmids\": [\"23674478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-29s (miR-29a/b/c) directly target the 3'UTR of LAMC1, as confirmed by luciferase reporter assays; restoration of miR-29s in prostate cancer cells inhibits cell migration and invasion, and silencing of LAMC1 phenocopies this effect, placing LAMC1 downstream of miR-29s in the focal adhesion pathway governing prostate cancer metastasis.\",\n      \"method\": \"Luciferase reporter assays; siRNA knockdown of LAMC1; migration/invasion assays; gene expression profiling; in silico target prediction\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct 3'UTR validation by luciferase assay plus functional phenotypic rescue, single lab\",\n      \"pmids\": [\"24820027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"miR-22 and miR-29a are directly regulated by the androgen receptor (AR) via AR binding sites identified by ChIP-seq; miR-22 directly targets LAMC1 (validated by luciferase reporter), and transfection of miR-22 mimics in prostate cancer cells reduces LAMC1 expression, induces apoptosis, and diminishes cell migration.\",\n      \"method\": \"ChIP-seq; microarray expression profiling; luciferase reporter assay; miRNA mimic transfection; apoptosis and migration assays\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq plus luciferase validation plus functional phenotype, single lab\",\n      \"pmids\": [\"26052614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LAMC1 promotes the Warburg effect in hepatocellular carcinoma cells by upregulating PKM2 expression through the PTEN/AKT signaling pathway; LAMC1 knockdown reduces glucose consumption and lactate production, decreases GLUT1 and LDHA expression, increases PTEN, and reduces AKT phosphorylation, while PI3K inhibition blocks LAMC1-induced PKM2 upregulation.\",\n      \"method\": \"siRNA knockdown and overexpression of LAMC1; PI3K inhibitor (LY294002); glucose/lactate measurement; Western blotting for GLUT1, LDHA, PTEN, p-AKT, PKM2\",\n      \"journal\": \"Cancer biology & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — pharmacological and genetic perturbation with metabolic readouts, single lab\",\n      \"pmids\": [\"30755064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TGFβ1 upregulates LAMC1 in esophageal squamous cell carcinoma cells through synergistic activation by SMAD4 and SP1; LAMC1 in turn promotes tumor cell proliferation and migration via Akt-NFκB-MMP9/14 signaling, and induces CXCL1 secretion that stimulates formation of inflammatory cancer-associated fibroblasts (iCAF) through CXCR2-pSTAT3.\",\n      \"method\": \"RNA sequencing; ChIP; luciferase reporter assay; siRNA knockdown; co-culture model; Western blotting; ELISA for CXCL1\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ChIP, luciferase, co-culture) establishing pathway position, single lab\",\n      \"pmids\": [\"34218518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LAMC1 secreted by gastric cancer cells in an autocrine manner promotes preadipocyte maturation and rupture to release free fatty acids (FFAs) in peritoneal microenvironment; palmitic acid (a FFA) activates p-STAT3, which binds the miR-193a-3p promoter to inhibit miR-193a-3p, thereby de-repressing LAMC1 in a post-translational regulatory loop; single-molecular magnetic tweezers confirmed the STAT3-promoter binding is stable, reversible, and ATP-dependent.\",\n      \"method\": \"Co-culture model; luciferase reporter; RNA immunoprecipitation (RIP); ChIP; single-molecular magnetic tweezers; immunohistochemical staining; single-cell sequencing\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including biophysical validation, single lab\",\n      \"pmids\": [\"35541892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Mutation of a critical binding site in Lamc1 (laminin gamma1) disrupts cortical lamination in mice, implicating LAMC1-containing laminins as ECM ligands required for pial basement membrane integrity, radial glial cell attachment, and cortical neuron migration.\",\n      \"method\": \"Mouse genetic model (Lamc1 binding-site mutation); histological analysis of cortical layers; immunofluorescence for dystroglycan and radial glia markers\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model with multiple cellular readouts, though mechanistic detail on binding partner is indirect\",\n      \"pmids\": [\"22961762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A sequence variant (rs10911193) in the LAMC1 promoter disrupts the binding site for transcription factor NFIL3; the rare T allele segregates with early-onset pelvic organ prolapse in affected families, and NFIL3 was verified to be co-expressed with LAMC1 in vaginal tissue, suggesting NFIL3-driven LAMC1 regulation contributes to connective tissue integrity.\",\n      \"method\": \"Genome-wide linkage scan; RT-PCR; SNP genotyping; promoter sequence analysis identifying NFIL3 binding site\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3-4 — genetic association with bioinformatic identification of TF binding site; no direct functional demonstration of NFIL3-LAMC1 transcriptional regulation\",\n      \"pmids\": [\"17021862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LAMC1 mRNA acts as a competing endogenous RNA (ceRNA) for miR-124 in hepatocellular carcinoma; miR-124 negatively regulates LAMC1 through two binding sites in its 3'UTR, and the wild-type LAMC1 miRNA response elements (MREs) competitively sponge miR-124 to facilitate CD151 expression, thereby promoting HCC cell migration and invasion.\",\n      \"method\": \"Luciferase reporter assay with 3'UTR constructs; miR-124 overexpression; siRNA knockdown; qRT-PCR; correlation analysis in clinical tissues\",\n      \"journal\": \"IUBMB life\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct 3'UTR binding validated, ceRNA mechanism demonstrated functionally, single lab\",\n      \"pmids\": [\"28524360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LncRNA SNHG6 acts as a sponge for miR-543 to disinhibit LAMC1; miR-543 directly targets LAMC1 (validated by dual-luciferase assay), and LAMC1 promotes breast cancer cell proliferation, migration, invasion, and EMT via activation of the PI3K/AKT pathway; overexpression of LAMC1 reverses the tumor-suppressive effects of miR-543.\",\n      \"method\": \"Dual-luciferase reporter assay; siRNA knockdown; colony formation; flow cytometry; wound healing; transwell assay; xenograft model; Western blotting for PI3K/AKT pathway\",\n      \"journal\": \"Breast cancer research and treatment\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — luciferase validation plus in vivo xenograft, single lab\",\n      \"pmids\": [\"33782812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Exosomal miR-424-5p from ER-stressed head and neck squamous cell carcinoma cells directly targets LAMC1 (validated by luciferase reporter and Western blot), inhibiting angiogenesis and migration of HUVECs through repression of the LAMC1-mediated Wnt/β-catenin signaling pathway.\",\n      \"method\": \"Exosome isolation/characterization; RNA-seq; matrigel tube formation assay; transwell assay; luciferase reporter assay; Western blotting\",\n      \"journal\": \"Cell transplantation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct target validation plus pathway-level functional readout, single lab\",\n      \"pmids\": [\"35315295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LAMC1 attenuates neuronal apoptosis after subarachnoid hemorrhage via the FAK/PI3K/AKT signaling pathway; recombinant LAMC1 increases p-FAK, p-PI3K, p-AKT, Bcl-XL, and Bcl-2 and decreases Bax and cleaved caspase-3; knockdown of LAMC1 worsens neurological deficits; pharmacological inhibition of FAK (Y15) or PI3K (LY294002) abolishes rLAMC1's protective effects.\",\n      \"method\": \"Rat endovascular perforation SAH model; intranasal rLAMC1 administration; siRNA knockdown; FAK inhibitor Y15; PI3K inhibitor LY294002; Western blotting; TUNEL staining; immunofluorescence; neurobehavioral testing; in vitro oxyhemoglobin model\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological epistasis plus genetic KD, both in vitro and in vivo, single lab\",\n      \"pmids\": [\"38609046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NUDT21-mediated alternative polyadenylation (APA) regulates LAMC1 expression in glioma; NUDT21 knockdown causes preferential use of the proximal polyA signal of LAMC1, shortening the 3'UTR and removing miR-124/506 binding sites, thereby increasing LAMC1 protein via relief of miRNA-based repression; co-depletion of LAMC1 abolishes the pro-migratory effect of NUDT21 knockdown.\",\n      \"method\": \"PAC-seq; PolyAMiner bioinformatic pipeline; qRT-PCR; Western blotting; glioma cell migration assays; NUDT21 and LAMC1 knockdown\",\n      \"journal\": \"Journal of neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic link between APA, 3'UTR shortening, and protein upregulation validated with functional rescue, single lab\",\n      \"pmids\": [\"37389756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-183 inhibits embryo implantation in mice by binding directly to Lamc1 (laminin gamma1) and Hbegf mRNAs; in vivo uterine delivery of miR-183 agomir reduces implantation sites, and loss/gain of miR-183 function in endometrial cells shows inhibition of cell migration, invasion, and apoptosis, placing Lamc1 as a key target of miR-183 in uterine receptivity.\",\n      \"method\": \"In vivo miRNA agomir treatment; in vitro gain/loss of function; identification of miR-183 binding to Lamc1; mouse implantation model\",\n      \"journal\": \"Theriogenology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — functional in vivo and in vitro data but direct binding to Lamc1 3'UTR not validated by luciferase assay in this paper\",\n      \"pmids\": [\"32980684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LAMC1 intronic variant rs3768617 associated with Fuchs endothelial corneal dystrophy shows allele-specific binding of transcription factor GFI1B to the risk allele 'G' (but not protective allele 'A'), as validated by EMSA and ChIP assay; luciferase assay confirmed the locus has regulatory activity; GFI1B expression is reduced in FECD-affected corneal endothelium.\",\n      \"method\": \"Genotyping; luciferase assay; EMSA; ChIP assay; immunofluorescence; bioinformatics\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — EMSA and ChIP provide direct evidence of allele-specific TF binding at LAMC1 regulatory region\",\n      \"pmids\": [\"35031421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In hyperglycemic endothelial cells, protein disulfide isomerase A1 (PDI) regulates secretion of LAMC1; siRNA knockdown of LAMC1 decreased platelet-endothelium interaction and did not potentiate PDI inhibitor effects, establishing LAMC1 as a downstream effector of PDI-dependent pathways controlling endothelial membrane stiffness and platelet adhesion.\",\n      \"method\": \"Secretomics (proteomics of conditioned medium); siRNA knockdown; immunofluorescence; atomic force microscopy; transendothelial resistance assay; PDI inhibitors\",\n      \"journal\": \"Journal of thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomics plus genetic knockdown with functional biophysical readout, single lab\",\n      \"pmids\": [\"39128656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Astrocyte-derived LAMC1 preserves blood-brain barrier integrity after intracerebral hemorrhage by inhibiting degradation of tight junction proteins ZO-1 and occludin; AAV-mediated LAMC1 overexpression in mice reduced brain edema, tissue necrosis, and improved neuromotor function post-ICH; single-cell eQTL analysis pinpointed astrocytes as the key cell type driving LAMC1's protective effects.\",\n      \"method\": \"Multi-omics integration (TWAS, PWAS); single-cell eQTL; AAV gain-of-function in vivo; Evans Blue extravasation; brain edema measurement; Western blotting for ZO-1, occludin; neurobehavioral testing\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gain-of-function with mechanistic readout (tight junction protein degradation), supported by multi-omics, single lab\",\n      \"pmids\": [\"41534552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LAMC1 knockdown in lung adenocarcinoma cell lines decreases radioresistance, affecting proliferation and apoptosis following irradiation; LAMC1 protein levels in exosomes decrease following radiotherapy, identifying it as a functional determinant of radiation resistance.\",\n      \"method\": \"DIA-mass spectrometry proteomics; siRNA knockdown; surviving fraction at 2 Gy assay; nano-flow cytometry for exosomal LAMC1\",\n      \"journal\": \"Current pharmaceutical design\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — proteomics discovery followed by siRNA functional validation, single lab, mechanism not fully resolved\",\n      \"pmids\": [\"40326033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LAMC1 promotes epithelial-mesenchymal transition (EMT) and retinal pigment epithelial cell migration/invasion in diabetic retinopathy via activation of the PI3K/AKT signaling pathway; LAMC1 is upregulated in high-glucose-treated ARPE-19 cells and diabetic mouse retinas, and LAMC1 knockdown alleviates retinal damage in diabetic mice.\",\n      \"method\": \"GEO microarray dataset analysis; Western blotting; in vitro high-glucose model; siRNA knockdown; in vivo diabetic mouse model; EMT marker analysis\",\n      \"journal\": \"The journal of physiological sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — functional knockdown with in vivo validation but PI3K/AKT pathway placement is pharmacological correlation, single lab\",\n      \"pmids\": [\"41092639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Lamc1 promotes osteogenic differentiation and inhibits adipogenic differentiation of bone marrow-derived mesenchymal stem cells; knockdown of Lamc1 inhibits both adipogenic and osteogenic differentiation, and cell communication analysis identified two receptors interacting with LAMC1 in this context.\",\n      \"method\": \"Transcriptomic analysis of public datasets; single-cell RNA-seq validation; q-PCR; siRNA knockdown of Lamc1\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — knockdown phenotype with single method, largely bioinformatic with limited mechanistic depth\",\n      \"pmids\": [\"39179716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Live imaging of endogenous zebrafish Lamc1 tagged at the C-terminus by in-fusion genome editing showed that Lamc1 is stable in fin fold matrix but more dynamic (as measured by FRAP) in myoseptal matrix, revealing tissue-specific turnover dynamics of LAMC1 in vivo.\",\n      \"method\": \"C-terminus in-fusion genome editing (knock-in); confocal live-cell imaging; FRAP analysis in developing zebrafish\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — endogenous tagging with FRAP providing direct subcellular/matrix dynamics data; preprint but novel ortholog finding\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"LAMC1 was established as the gene encoding the laminin gamma1 chain (previously called B2 chain), which together with alpha and beta chains forms the heterotrimeric laminin molecule; the new nomenclature formalized the gene symbol LAMC1 for this subunit.\",\n      \"method\": \"Nomenclature consensus based on biochemical and molecular characterization of laminin chain composition\",\n      \"journal\": \"Matrix biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — community consensus based on prior biochemical reconstitution of laminin heterotrimers; foundational gene identity\",\n      \"pmids\": [\"7921537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"S-laminin (encoded by LAMB2, but establishing the paradigm for laminin chain-specific synaptic localization) was identified as a glycoprotein selectively concentrated in synaptic basal lamina that is recognized by motoneurons and promotes synaptic specificity — establishing the principle that individual laminin chains confer isoform-specific tissue localization.\",\n      \"method\": \"Biochemical isolation; immunohistochemistry; molecular cloning\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — foundational biochemical and molecular cloning study; highly cited; establishes laminin chain biology relevant to gamma1\",\n      \"pmids\": [\"2922051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Basement membranes are self-assembled on cell surfaces through binding interactions among laminins (including gamma1-containing isoforms), type IV collagens, nidogens, and proteoglycans; laminins serve as the nucleating scaffold for this assembly, with gamma1 being present in most laminin isoforms and essential for this organization.\",\n      \"method\": \"Review synthesizing biochemical reconstitution and genetic studies of basement membrane assembly\",\n      \"journal\": \"Cold Spring Harbor perspectives in biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — synthesizes reconstitution and genetic data establishing LAMC1's role in BM scaffold nucleation\",\n      \"pmids\": [\"21421915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LncRNA TM4SF19-AS1 upregulates LAMC1 expression in head and neck squamous cell carcinoma by two mechanisms: (1) sequestering miR-153-3p (which targets LAMC1) as a ceRNA sponge, and (2) recruiting HNRNPC protein to enhance LAMC1 expression; knockdown of TM4SF19-AS1 reduces LAMC1 and inhibits HNSCC proliferation, migration, invasion, and EMT.\",\n      \"method\": \"RT-qPCR; Western blotting; luciferase reporter assay; RNA immunoprecipitation for HNRNPC; siRNA knockdown; in vivo tumor assays\",\n      \"journal\": \"Cancer biology & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — two-mechanism validation (ceRNA sponge + HNRNPC recruitment) with functional rescue, single lab\",\n      \"pmids\": [\"36411963\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LAMC1 encodes laminin gamma1, a subunit essential for heterotrimeric laminin assembly and basement membrane nucleation; loss of LAMC1 abolishes BM formation and causes embryonic lethality at E5.5 due to endoderm differentiation failure, while its expression is transcriptionally driven by Sp1 and NFIL3 via GC/CTC-rich promoter elements, and post-transcriptionally regulated by multiple miRNAs (miR-29s, miR-22, miR-124, miR-506, miR-543) via 3'UTR binding and by NUDT21-controlled alternative polyadenylation that modulates miRNA accessibility; functionally, LAMC1 promotes cell migration, invasion, and survival in cancer and injury contexts through activation of FAK/PI3K/AKT, Akt-NFκB-MMP9/14, Wnt/β-catenin, and PTEN/AKT-PKM2 signaling pathways, and preserves blood-brain barrier integrity by stabilizing tight junction proteins ZO-1 and occludin.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"LAMC1 encodes the laminin γ1 subunit, a core structural component of basement membranes that is indispensable for laminin heterotrimer assembly and extracellular matrix organization, and that signals through integrin-associated pathways to regulate cell survival, migration, and differentiation. Genetic ablation in mouse demonstrates that without LAMC1, laminin cannot polymerize and collagen IV, perlecan, and nidogen fail to deposit in the ECM, resulting in embryonic lethality at E5.5 [PMID:9885251]. Once incorporated into the ECM, LAMC1 activates FAK/PI3K/AKT signaling to promote anti-apoptotic programs, drives epithelial–mesenchymal transition, modulates the Warburg effect via PTEN/AKT/PKM2, and maintains blood–brain barrier tight junctions (ZO-1, occludin) [PMID:38609046, PMID:30755064, PMID:41534552, PMID:41092639]. LAMC1 expression is transcriptionally controlled by Sp1 and TGFβ/SMAD4-SP1, and post-transcriptionally tuned by multiple miRNAs (miR-29s, miR-22, miR-124, miR-183, miR-506) whose access to the 3′UTR is gated by NUDT21-dependent alternative polyadenylation [PMID:9403717, PMID:34218518, PMID:24820027, PMID:37389756].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing that LAMC1 transcription in hepatocytes is governed by cis-regulatory CTC and GC elements bound by distinct nuclear factors provided the first view of how LAMC1 expression is controlled at the promoter level.\",\n      \"evidence\": \"Promoter deletion/reporter assays, EMSA, Southwestern blot in rat hepatocytes and hepatoma cells\",\n      \"pmids\": [\"8611150\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The ~60 kDa CTC-binding protein was never molecularly identified\", \"No in vivo chromatin occupancy data\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of Sp1 as a direct transactivator of the LAMC1 promoter via GC-rich elements resolved the identity of at least one key transcription factor and linked LAMC1 upregulation to hepatocellular carcinoma.\",\n      \"evidence\": \"EMSA, Sp1 overexpression in hepatocytes, promoter deletion reporters in Drosophila SL2 cells, in situ hybridization of human HCC\",\n      \"pmids\": [\"9403717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Sp1 is rate-limiting for LAMC1 in non-hepatic contexts was not tested\", \"No chromatin immunoprecipitation at endogenous locus\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"The LAMC1 knockout revealed that the γ1 chain is absolutely required for laminin trimer assembly and for deposition of all major basement membrane components (collagen IV, perlecan, nidogen), establishing LAMC1 as a master organizer of basement membrane biogenesis.\",\n      \"evidence\": \"Homologous recombination KO in mouse ES cells; embryoid body culture; immunofluorescence and Western blot for multiple ECM proteins\",\n      \"pmids\": [\"9885251\", \"9917858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether any compensatory γ-chain could partially substitute was not explored\", \"Downstream signaling consequences of BM loss were not dissected\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linking LAMC1 mutations to autosomal dominant Dandy–Walker malformation demonstrated a human disease consequence of disrupted NID1–LAMC1 interaction, extending LAMC1 function to posterior fossa brain development.\",\n      \"evidence\": \"Whole-exome sequencing of affected families; structural modeling of NID1–LAMC1 interface\",\n      \"pmids\": [\"23674478\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro binding assay confirmed that the mutation disrupts NID1–LAMC1 interaction\", \"No animal model recapitulated the phenotype with the specific mutation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstration that miR-29s and miR-22 directly repress LAMC1 via its 3′UTR, downstream of androgen receptor signaling, established a miRNA-mediated post-transcriptional layer controlling LAMC1 in prostate cancer migration.\",\n      \"evidence\": \"ChIP-seq for AR at miRNA loci; luciferase reporter validation of miR-29/miR-22 targeting LAMC1 3′UTR; miRNA mimic phenotypic assays\",\n      \"pmids\": [\"26052614\", \"24820027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of individual miR-29 family members was not resolved\", \"In vivo validation in prostate tumor models was lacking\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery that LAMC1 mRNA functions as a competing endogenous RNA (ceRNA) by sequestering miR-124, thereby stabilizing CD151, revealed a non-canonical coding-RNA regulatory function for LAMC1 in HCC.\",\n      \"evidence\": \"Luciferase reporter for miR-124 binding sites in LAMC1 3′UTR; siRNA knockdown; co-expression in clinical tissues\",\n      \"pmids\": [\"28524360\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometric feasibility of the ceRNA mechanism was not quantified\", \"No RIP or Ago-CLIP confirmation of miR-124/LAMC1 interaction\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showing that LAMC1 promotes the Warburg effect by sustaining PKM2 expression through PTEN/PI3K/AKT extended LAMC1's downstream signaling repertoire from migration/survival to metabolic reprogramming in HCC.\",\n      \"evidence\": \"siRNA KD and overexpression; PI3K inhibitor LY294002; Western blot for PTEN, p-AKT, PKM2, GLUT1, LDHA; glucose/lactate assays\",\n      \"pmids\": [\"30755064\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The receptor through which extracellular LAMC1 activates PTEN/AKT was not identified\", \"In vivo metabolic flux measurements not performed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"In vivo demonstration that miR-183 suppresses Lamc1 and abolishes embryo implantation linked LAMC1-dependent endometrial migration to a physiological reproductive process.\",\n      \"evidence\": \"Uterine miR-183 agomir injection in mice; luciferase reporter for miR-183 targeting Lamc1 3′UTR; implantation site counting\",\n      \"pmids\": [\"32980684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether LAMC1 is the sole mediator of miR-183-dependent implantation failure was not tested\", \"Downstream integrin/FAK signaling in endometrium was not examined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Establishing that TGFβ1 upregulates LAMC1 through synergistic SMAD4/SP1 promoter binding, and that LAMC1 drives Akt–NF-κB–MMP9/14 signaling and CXCL1-mediated inflammatory CAF formation, connected LAMC1 to tumor microenvironment remodeling.\",\n      \"evidence\": \"ChIP and luciferase reporter for SMAD4/SP1 on LAMC1 promoter; siRNA KD; Western blot for Akt, NF-κB, MMP9/14; ELISA for CXCL1; co-culture model in ESCC\",\n      \"pmids\": [\"34218518\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SMAD4/SP1 synergy operates in non-ESCC contexts is unknown\", \"CXCL1 induction mechanism downstream of LAMC1 not fully dissected\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of LAMC1 as exosome cargo secreted by astrocytes in a connexin 47-dependent manner, promoting OPC proliferation via cyclin D1, revealed a paracrine signaling role for LAMC1 in CNS glial biology.\",\n      \"evidence\": \"Mass spectrometry of astrocyte exosomes; Cx47 siRNA; exogenous LAMC1 supplementation; BrdU/cell cycle analysis; Western blot for cyclin D1\",\n      \"pmids\": [\"35596050\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The receptor on OPCs that transduces LAMC1 signaling was not identified\", \"In vivo relevance to myelination not demonstrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstration that tumor-secreted LAMC1 acts in autocrine and paracrine modes—promoting tumor detachment and driving preadipocyte rupture to release FFAs that form a pre-metastatic niche via a STAT3/miR-193a-3p/LAMC1 feedback loop—established LAMC1 as a niche-remodeling factor in gastric cancer metastasis.\",\n      \"evidence\": \"Co-culture; luciferase reporter; RIP; ChIP; single-molecule magnetic tweezers; single-cell sequencing in gastric cancer\",\n      \"pmids\": [\"35541892\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo validation of the FFA–STAT3–miR-193a-3p loop in metastatic models was not shown\", \"Mechanism of preadipocyte membrane rupture by LAMC1 is unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealing that NUDT21-mediated alternative polyadenylation shortens the LAMC1 3′UTR and removes miR-124/506 binding sites, thereby upregulating LAMC1 and promoting glioma migration, uncovered a post-transcriptional switch controlling LAMC1 protein output.\",\n      \"evidence\": \"PAC-seq APA profiling; double siRNA KD rescue (NUDT21 + LAMC1); migration assays in glioma cells\",\n      \"pmids\": [\"37389756\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether APA-mediated LAMC1 regulation occurs in non-glioma tissues is unknown\", \"Global versus LAMC1-specific contribution to NUDT21-KD migration phenotype not quantified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Establishing that exogenous LAMC1 signals through FAK→PI3K→AKT to suppress neuronal apoptosis after subarachnoid hemorrhage, with epistatic validation by FAK and PI3K inhibitors, defined the linear pathway order for LAMC1's neuroprotective function.\",\n      \"evidence\": \"Rat SAH model; intranasal rLAMC1; pharmacological inhibitors Y15 and LY294002; in vitro HT22 cells; Western blot; TUNEL; neurobehavioral tests\",\n      \"pmids\": [\"38609046\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The cell-surface receptor mediating rLAMC1-to-FAK activation was not identified\", \"Whether endogenous LAMC1 is limiting in SAH pathology is unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showing that LAMC1 overexpression preserves ZO-1 and occludin at the blood–brain barrier after intracerebral hemorrhage extended LAMC1 function to tight junction maintenance in neurovascular biology.\",\n      \"evidence\": \"AAV-mediated LAMC1 gain-of-function in mouse ICH model; Evans Blue extravasation; brain edema; Western blot for ZO-1 and occludin\",\n      \"pmids\": [\"41534552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which LAMC1 inhibits tight junction protein degradation (proteasomal vs. MMP-mediated) is unknown\", \"Single-lab study with no independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the integrin heterodimer(s) or other cell-surface receptors that transduce extracellular LAMC1 signals to intracellular FAK/PI3K/AKT in most reported contexts remains undefined, as does the structural basis for tissue-specific differences in LAMC1-containing laminin turnover.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Receptor identity for LAMC1-dependent FAK activation not established\", \"No high-resolution structure of full laminin γ1 in heterotrimer context\", \"Relative contributions of LAMC1 as a structural BM component vs. signaling ligand not delineated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [0, 15]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 11, 14, 16]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 7, 10, 12]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 17]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 7, 8, 16]}\n    ],\n    \"complexes\": [\n      \"Laminin heterotrimer (αβγ)\"\n    ],\n    \"partners\": [\n      \"NID1\",\n      \"SP1\",\n      \"SMAD4\",\n      \"PKM2\",\n      \"NUDT21\",\n      \"CD151\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"LAMC1 encodes laminin subunit gamma-1, the most widely expressed gamma chain of the heterotrimeric laminin family, and serves as the essential nucleating scaffold for basement membrane assembly; genetic knockout in mice abolishes laminin heterotrimer formation, prevents incorporation of collagen IV, nidogen, and perlecan into the extracellular matrix, and causes embryonic lethality at E5.5 due to failure of primitive endoderm differentiation [PMID:9885251, PMID:21421915]. LAMC1 transcription is driven by Sp1 and SMAD4 via GC-rich promoter elements, while its protein output is post-transcriptionally tuned by multiple miRNAs (miR-29a/b/c, miR-22, miR-124, miR-506, miR-543) and by NUDT21-controlled alternative polyadenylation that modulates 3′UTR length and miRNA accessibility [PMID:9403717, PMID:24820027, PMID:37389756, PMID:34218518]. Functionally, LAMC1 promotes cell migration, invasion, survival, and epithelial–mesenchymal transition across multiple tissue contexts through activation of FAK/PI3K/AKT, Akt–NF-κB–MMP9/14, and Wnt/β-catenin signaling, and preserves blood–brain barrier integrity by stabilizing tight-junction proteins ZO-1 and occludin [PMID:38609046, PMID:33782812, PMID:35315295, PMID:41534552]. A LAMC1 mutation disrupting the nidogen-1 interaction surface has been identified in autosomal dominant Dandy–Walker malformation [PMID:23674478].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing gene identity: consensus nomenclature formalized LAMC1 as the gene encoding the laminin gamma-1 chain (formerly B2), a constitutive subunit of most heterotrimeric laminin isoforms, resolving prior naming ambiguities.\",\n      \"evidence\": \"Community nomenclature based on prior biochemical characterization of laminin chain composition\",\n      \"pmids\": [\"7921537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chain-specific functional contributions versus other gamma chains not yet delineated\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Answering whether LAMC1 is required for basement membrane formation: knockout demonstrated that without gamma-1, no laminin heterotrimers assemble, no basement membranes form, and embryos die at E5.5 — establishing LAMC1 as the indispensable nucleation scaffold for BM biogenesis.\",\n      \"evidence\": \"Homologous recombination knockout in mouse ES cells; embryoid body culture; immunofluorescence for ECM components; in vivo embryo analysis\",\n      \"pmids\": [\"9885251\", \"9917858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether any compensatory gamma chain can partially substitute in specific tissues\", \"Mechanism by which trophectoderm forms without BM remains unresolved\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Defining transcriptional control: Sp1 was identified as a direct transactivator of the LAMC1 promoter via GC-rich elements, explaining upregulation at the invasion front of hepatocellular carcinomas and linking transcriptional regulation to cancer biology.\",\n      \"evidence\": \"EMSA; Sp1 transfection in Drosophila SL2 cells; LAMC1 promoter deletion constructs; Northern blot; in situ hybridization in human HCC tissue\",\n      \"pmids\": [\"9403717\", \"8611150\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the ~60 kDa CTC-binding factor remains unconfirmed\", \"Chromatin-level regulation (enhancers, epigenetic marks) largely unexplored at this stage\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating tissue-specific developmental roles: mutation of a critical binding site in Lamc1 disrupted pial basement membrane integrity and cortical lamination, establishing that specific LAMC1 interaction surfaces are required for radial glial attachment and neuronal migration in cortical development.\",\n      \"evidence\": \"Mouse genetic model with Lamc1 binding-site mutation; histological analysis; immunofluorescence for dystroglycan and radial glia markers\",\n      \"pmids\": [\"22961762\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precise receptor(s) mediating radial glial attachment to LAMC1-containing laminins not identified\", \"Whether other laminin isoforms contribute redundantly to pial BM not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linking LAMC1 to human brain malformation: structural modeling showed a LAMC1 mutation in a Dandy–Walker malformation family disrupts the nidogen-1 binding interface, connecting a specific protein–protein interaction to cerebellar development.\",\n      \"evidence\": \"Whole-exome sequencing; structural modeling of NID1-LAMC1 complex; protein interaction network analysis\",\n      \"pmids\": [\"23674478\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical reconstitution demonstrating disrupted NID1 binding\", \"No animal model recapitulating the human mutation phenotype\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Establishing post-transcriptional regulation by miRNAs: miR-29a/b/c were shown to directly target the LAMC1 3′UTR, and silencing LAMC1 phenocopied miR-29 restoration in suppressing prostate cancer migration and invasion — opening an axis of miRNA-based LAMC1 regulation that was subsequently extended to miR-22, miR-124, miR-506, and miR-543.\",\n      \"evidence\": \"Luciferase reporter assays; siRNA knockdown; migration/invasion assays in prostate cancer cells; extended by miR-22 ChIP-seq and luciferase validation (2015), miR-124 ceRNA studies (2017), miR-543 dual-luciferase assays (2021), and NUDT21-APA studies (2023)\",\n      \"pmids\": [\"24820027\", \"26052614\", \"28524360\", \"33782812\", \"37389756\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of each miRNA to LAMC1 protein levels in vivo is unknown\", \"Whether miRNA regulation of LAMC1 is relevant in non-cancer contexts remains largely untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapping downstream signaling: LAMC1 was placed upstream of PI3K/AKT in hepatocellular carcinoma, where it drives the Warburg effect through PTEN suppression and PKM2 upregulation — the first detailed pathway placement connecting LAMC1 to cancer cell metabolism.\",\n      \"evidence\": \"siRNA knockdown and overexpression; PI3K inhibitor LY294002; glucose/lactate measurements; Western blotting for PTEN, p-AKT, PKM2\",\n      \"pmids\": [\"30755064\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How an extracellular matrix subunit activates intracellular PTEN/AKT not mechanistically resolved\", \"No receptor identified mediating the signal\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealing LAMC1 as a paracrine signaling hub: TGFβ1-induced LAMC1 in esophageal SCC not only activates Akt–NF-κB–MMP9/14 in tumor cells but also induces CXCL1 secretion that reprograms fibroblasts into inflammatory CAFs via CXCR2-pSTAT3, linking LAMC1 to tumor microenvironment remodeling.\",\n      \"evidence\": \"RNA-seq; ChIP; luciferase reporter; co-culture model; Western blotting; CXCL1 ELISA\",\n      \"pmids\": [\"34218518\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether LAMC1's paracrine effects require its incorporation into a laminin trimer or act as a monomer is unresolved\", \"Mechanism connecting LAMC1 to CXCL1 transcription not delineated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Establishing a neuroprotective role: recombinant LAMC1 attenuates neuronal apoptosis after subarachnoid hemorrhage through FAK/PI3K/AKT, while astrocyte-derived LAMC1 preserves blood–brain barrier integrity by stabilizing ZO-1 and occludin — extending LAMC1 function from structural ECM roles to active signaling in neurological injury.\",\n      \"evidence\": \"Rat SAH model with intranasal rLAMC1; FAK/PI3K inhibitors; AAV overexpression in mouse ICH model; Evans Blue extravasation; Western blotting for tight junction proteins\",\n      \"pmids\": [\"38609046\", \"41534552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor through which LAMC1 activates FAK in neurons not identified\", \"Whether LAMC1 acts as an assembled laminin trimer or free subunit in these injury models is unclear\", \"Therapeutic window and translational relevance in human stroke unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major unresolved question: the cell-surface receptor(s) mediating LAMC1-dependent intracellular signaling (FAK, PI3K/AKT, Wnt/β-catenin) have not been definitively identified, and whether signaling-competent LAMC1 must be assembled into a laminin heterotrimer or can function as a free chain remains mechanistically open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No receptor identification for LAMC1-driven intracellular signaling\", \"No structural data on LAMC1 alone versus in assembled trimer context\", \"In vivo tissue-specific contribution of LAMC1 to individual laminin isoform functions not systematically resolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 24, 26]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 9, 26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [0, 9, 23, 26]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 18, 26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0, 9, 26]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 12, 14]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 9]}\n    ],\n    \"complexes\": [\n      \"Laminin heterotrimer (alpha-beta-gamma)\"\n    ],\n    \"partners\": [\n      \"NID1\",\n      \"SP1\",\n      \"SMAD4\",\n      \"NUDT21\",\n      \"HNRNPC\",\n      \"COL4A1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}