{"gene":"LAMA5","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":2016,"finding":"BCAM (basal cell adhesion molecule) on tumor cells binds LAMA5 on endothelial cells, mediating adhesion of KRAS-mutant colorectal cancer cells specifically to endothelial cells (but not pericytes or hepatocytes); genetic suppression or biochemical inhibition of either BCAM or LAMA5 impaired this adhesion, and BCAM-mimic peptides inhibited metastasis in preclinical models.","method":"Adhesion assays, shRNA/genetic suppression, BCAM-mimic peptide functional inhibition, phage display identification, in vivo mouse metastasis models","journal":"Clinical Cancer Research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal loss-of-function (both BCAM and LAMA5 suppressed), adhesion assays, in vivo rescue, replicated across multiple experimental formats","pmids":["27143691"],"is_preprint":false},{"year":2016,"finding":"MMP1 secreted by oncogenically transformed (H-Ras) epithelial cells cleaves LAMA5, generating internal and C-terminal proteolytic fragments that promote endothelial cell angiogenesis (vessel length and branching) in a VEGF-independent manner; this pro-angiogenic effect is blocked by anti-integrin αvβ3 antibodies on endothelial cells.","method":"MMP1 knockdown (shRNA), secretome proteomics, in vitro angiogenesis assays, integrin antibody inhibition, in vivo xenograft tumors","journal":"Scientific Reports","confidence":"High","confidence_rationale":"Tier 2 — substrate identification with multiple orthogonal assays (KD, secretome MS, functional angiogenesis assay, integrin blocking) in one study","pmids":["27324842"],"is_preprint":false},{"year":2012,"finding":"Laminin α5 (LAMA5) promotes PI3K signaling and inhibits Wnt signaling in intestinal epithelial and mesenchymal cells; loss of LAMA5 in knockout mice causes conflicting signals that alter cell adhesion, migration, and differentiation, mechanistically linked by RNA profiling and cell culture knockdown experiments.","method":"Lama5 knockout mouse RNA profiling, cell culture knockdown, signaling pathway analysis (PI3K/Akt and Wnt pathway readouts)","journal":"PLoS One","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with RNA profiling plus cell culture knockdown mechanistic validation, multiple signaling pathways assessed","pmids":["22666383"],"is_preprint":false},{"year":2019,"finding":"Tumor-derived LAMA5 (laminin 511) in colorectal liver metastases is induced by TNFα/NFκB signaling from CD11b+ myeloid-cell-conditioned medium; LAMA5 downregulation by shRNA impaired hepatic metastatic growth, reduced intratumoral vessel branching, and increased Notch pathway gene expression in metastasis-derived endothelia, indicating LAMA5 promotes branching angiogenesis and suppresses Notch signaling.","method":"shRNA knockdown in cancer cells, qPCR with human-specific primers, orthotopic hepatic metastasis mouse models, Notch pathway gene expression analysis, conditioned medium experiments","journal":"Cancers","confidence":"High","confidence_rationale":"Tier 2 — clean KD with defined in vivo phenotype plus mechanistic pathway (TNFα/NFκB induction, Notch modulation) with multiple readouts","pmids":["31064120"],"is_preprint":false},{"year":2017,"finding":"The heterozygous LAMA5 mutation p.V3140M perturbs protein cleavage-derived peptide levels and disrupts epithelial-mesenchymal signaling, causing upregulation of Sonic hedgehog (SHH) and GLI1 and strong inhibition of ECM proteins COL1A1, MMP1, and MMP3 in patient-derived cells; a knock-in mouse model recapitulated similar tissue changes.","method":"Patient-derived cell expression studies, WES/RNAseq, skin biopsy morphology, knock-in mouse model generation and analysis","journal":"Journal of Medical Genetics","confidence":"Medium","confidence_rationale":"Tier 2 — human mutation with patient cell functional studies and knock-in mouse model, single lab","pmids":["28735299"],"is_preprint":false},{"year":2017,"finding":"The LAMA5 variant p.Arg2659Trp causes decreased binding of laminin α5 to SV2A (synaptic vesicle glycoprotein 2A), impairs laminin-521 cell-adhesion, and reduces cell projection support in primary neuronal cultures, leading to profound reduction of neuromuscular junction endplate potential quantal content and presynaptic terminal degeneration.","method":"Expression studies in neuronal cells, binding assays (laminin α5 to SV2A), cell-adhesion assays, primary neuronal culture, electrophysiology (repetitive nerve stimulation, endplate recordings), electron microscopy","journal":"American Journal of Medical Genetics Part A","confidence":"High","confidence_rationale":"Tier 1-2 — binding assay identifies SV2A as laminin α5 binding partner, combined with functional neuronal adhesion/projection assays and electrophysiological confirmation","pmids":["28544784","29377152"],"is_preprint":false},{"year":2020,"finding":"Loss of LAMA5 in skeletal cells disrupts a β1 integrin–PYK2–FYN focal adhesion complex, impairing non-canonical focal adhesion signaling in cartilage, negatively impacting actin cytoskeleton organization, vinculin localization, and WNT signaling, and causing a distinct bent bone dysplasia.","method":"Exome sequencing, Sanger confirmation, qPCR, western blot, immunohistochemistry, luciferase WNT reporter assay, migration/wound healing assays, patient cell studies","journal":"EBioMedicine","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (IHC, western, WNT reporter, migration) in patient-derived cells identifying the LAMA5–β1 integrin–PYK2–FYN pathway","pmids":["33242826"],"is_preprint":false},{"year":2021,"finding":"A missense mutation (E884G) in the L4a domain of LAMA5 reduces LAMA5 protein levels in vivo and significantly reduces laminin 521 heterotrimer assembly in vitro; homozygous mice develop nephrotic syndrome with glomerular ultrastructural changes, and proteomic analysis revealed altered glomerular ECM composition.","method":"Mouse knock-in model, in vitro heterotrimer assembly assay, proteomics of glomerular ECM, histology, ultrastructural analysis","journal":"Kidney International","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro heterotrimer formation assay plus in vivo mouse model with proteomics, multiple orthogonal methods","pmids":["34774562"],"is_preprint":false},{"year":2021,"finding":"Truncating LAMA5 variants produce shorter laminin α5 proteins that still form trimers with laminin β1 and γ1 chains, as demonstrated by in vitro heterotrimer formation assays, establishing that partial truncation does not abolish trimerization but causes infantile nephrotic syndrome.","method":"In vitro heterotrimer formation assay, targeted next-generation sequencing, clinical phenotyping","journal":"Kidney360","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro reconstitution assay, single lab, single study","pmids":["35419533"],"is_preprint":false},{"year":2021,"finding":"Canonical Wnt/β-catenin signaling regulates submandibular gland branching morphogenesis through modulation of Lama5 levels; FGF signaling acts upstream as a negative regulator of canonical Wnt, and Wnt inhibition promotes while Wnt overactivation suppresses epithelial branching, with Lama5 as a downstream effector.","method":"Embryonic mouse SMG organ culture, morphogenesis assays, gene expression analysis, Wnt pathway inhibitor/activator (Wnt3a) treatments","journal":"International Journal of Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — epistasis established in organ culture model with pharmacologic pathway manipulation, single lab","pmids":["33629734"],"is_preprint":false},{"year":2018,"finding":"LAMA5 knockdown in human umbilical vein endothelial cells (HUVECs) decreases proliferation, migration, and vascular tube formation and increases apoptosis; mechanistically, reduced LAMA5 inhibits PI3K downstream p-AKT and p-mTOR protein expression.","method":"siRNA knockdown, CCK-8 proliferation assay, flow cytometry apoptosis, transwell migration, western blot of PI3K/AKT/mTOR pathway","journal":"Journal of Maternal-Fetal and Neonatal Medicine","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD with defined cellular phenotype and signaling pathway readout, single lab","pmids":["30200802"],"is_preprint":false},{"year":2023,"finding":"CAF-secreted LAMA5 signals through integrin α4 and STAT3 to drive acinar-to-ductal metaplasia in pancreatic cells; proteomic and transcriptomic integration identified the LAMA5/integrin α4/STAT3 axis, validated by KD experiments in cell lines, acinar explant co-cultures, and mouse models.","method":"CAF co-culture, conditioned medium experiments, LC-MS/MS proteomics, RNA-seq, confocal microscopy, immunoblotting, qRT-PCR, organoid and explant models","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — multi-omics integration with functional validation across multiple model systems (cell lines, organoids, explants, mouse) identifying a specific signaling axis","pmids":["38154529"],"is_preprint":false},{"year":2023,"finding":"LAMA5 knockdown in ovarian cancer cells inhibits cell proliferation, migration, and invasion in vitro and in vivo and reduces expression of EMT markers and Notch signaling pathway-related markers, placing LAMA5 upstream of Notch and EMT programs.","method":"Lentiviral shRNA knockdown, in vitro proliferation/migration/invasion assays, in vivo xenograft, western blot/qPCR for Notch and EMT markers","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2-3 — KD with in vivo and in vitro phenotypes plus signaling pathway readouts, single lab","pmids":["37527216"],"is_preprint":false},{"year":2022,"finding":"A heterozygous LAMA5 variant (p.Val3687Met) impairs secretion of the laminin α5 LG4-5 domain in a cell-type-dependent manner; knockin mice develop FSGS-like glomerulopathy with reduced laminin α5 and increased glomerular vinculin levels, indicating that impaired LAMA5 secretion and consequent defective cell adhesion underlie the glomerulopathy.","method":"In vitro secretion assay of LG4-5 domain, knockin mouse model (heterozygous and homozygous), histopathology, immunofluorescence for laminin α5 and vinculin","journal":"JCI Insight","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro functional assay plus knockin mouse model, single lab","pmids":["36173685"],"is_preprint":false},{"year":2011,"finding":"Human LAMA5 transgene expression in mouse kidney suppresses endogenous mouse Lama5 mRNA and laminin α5 protein deposition, demonstrating the existence of a laminin expression monitor in kidney that regulates overall production of basement membrane protein; human laminin α5 is deposited from both glomerular endothelial cells and podocytes.","method":"Transgenic mice (BAC-based human LAMA5), immunoelectron microscopy, northern/western blot, mRNA quantification","journal":"PLoS One","confidence":"Medium","confidence_rationale":"Tier 2 — direct transgenic experiment with immunoelectron microscopy and RNA quantification, single lab","pmids":["21915268"],"is_preprint":false},{"year":2023,"finding":"LAMA5 silencing in murine palatal process cells causes cleft palate by inhibiting cell proliferation (reduced ki67, cyclin D1) and promoting apoptosis (increased caspase 3), and interferes with the SHH signaling pathway (reduced GLI1) without affecting EMT markers or Shh/Ptch1 expression.","method":"shRNA adenovirus transfection of E13.5 mouse palatal process, ex vivo organ culture fusion assay, PCR, western blot","journal":"Biomedical Journal","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct KD in ex vivo organ culture with specific molecular readouts, single lab","pmids":["37390938"],"is_preprint":false},{"year":2025,"finding":"Glucocorticoid receptor (GR) directly targets LAMA5 as a transcriptional target gene; corticosterone-GR-LAMA5 axis mediates chronic psychological stress-induced cardiomyocyte hypertrophy, validated in vivo and in vitro.","method":"Animal stress models, in vitro cardiomyocyte experiments, GR target gene identification (confirmed in vivo and in vitro)","journal":"Advanced Science","confidence":"Medium","confidence_rationale":"Tier 2 — GR-LAMA5 transcriptional axis confirmed in vivo and in vitro, single lab","pmids":["40642838"],"is_preprint":false},{"year":2025,"finding":"MAZ (Myc-associated zinc finger protein) transcription factor binds the LAMA5 promoter and activates LAMA5 transcription; LAMA5 in turn activates STAT3 signaling to promote gastric cancer cell proliferation and migration.","method":"ChIP assay, luciferase reporter assay, shRNA knockdown of MAZ and LAMA5, STAT3 activator rescue (Colivelin), CCK-8, colony formation, wound healing, Transwell assays, in vivo tumor models","journal":"Functional & Integrative Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and luciferase confirm direct MAZ-LAMA5 transcriptional regulation, rescue experiments confirm LAMA5-STAT3 axis, single lab","pmids":["40072648"],"is_preprint":false},{"year":2025,"finding":"Loss of LAMA5 in human urine-derived stem cells impairs chondrogenesis and disrupts WNT signaling; WNT7A and FLI1 are key dysregulated genes, and pharmacologic WNT activation (LiCl) partially restores their expression, indicating LAMA5 is required for ECM–WNT signaling integration during chondrogenesis.","method":"CRISPR/Cas9 LAMA5 knockout, 2D/3D chondrogenic differentiation, bulk RNA-seq, WGCNA, LiCl pharmacologic rescue, qPCR","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO with transcriptomics and pharmacologic rescue, preprint not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2025,"finding":"In zebrafish, laminin α5 (Lama5) interacts with integrin α6b to maintain apicobasal polarity and epithelial identity in basal epidermal cells; loss of Lama5 reduces E-cadherin localization and promotes mesenchymal traits, and the integrin α6b mutant phenotype is not exacerbated in the double mutant, placing Lama5 and integrin α6b in the same pathway.","method":"Zebrafish lama5 loss-of-function, integrin α6b mutant, double mutant epistasis, confocal imaging of E-cadherin and polarity markers","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis in zebrafish with direct imaging of molecular readouts, preprint","pmids":[],"is_preprint":true},{"year":2025,"finding":"In zebrafish posterior lateral line primordium, laminin α5 (Lama5) is a key basement membrane component underlying migrating epithelial cells; simultaneous depletion of lama5 and itga6b (integrin α6b) markedly decreases collective migration velocity and ultimately blocks migration, whereas loss of lama5 alone compromises basement membrane integrity without impairing migration, revealing redundancy between Lama5 and integrin α6b adhesion systems.","method":"Zebrafish lama5 and itga6b loss-of-function, double mutant/morphant analysis, live imaging of collective cell migration","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with quantitative live imaging in vivo, preprint","pmids":[],"is_preprint":true},{"year":2025,"finding":"In cerebral blood vessels, endothelial-specific loss of laminin α5 (Tek-cre:Lama5-/-) alters vascular zonation and junctional protein expression; compensatory upregulation of laminin α5 in Lama4-/- vessels enhances expression of junctional proteins (Ocln, Cldn5) and promotes vessel contractility, demonstrating that laminin α4/α5 ratios regulate functional zonation between arterioles, capillaries, and postcapillary venules.","method":"Single-cell RNA sequencing of cerebral blood vessels from conditional KO and Lama4-/- mice, in vitro and in vivo studies, transcriptomic profiling","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — scRNA-seq with conditional KO models and in vitro/in vivo validation, preprint","pmids":[],"is_preprint":true},{"year":2024,"finding":"Luminal deletion of Lama5 in MMTV-PyMT mice markedly reduces emergence of early mammary hyperplasias and shifts phenotype from mature HR+ luminal epithelial to HR+ progenitor; biallelic Lama5 deletion causes widespread ECM and FGF signaling alterations including overexpression of Fgfr2, and inhibition of FGF receptors induces apoptosis specifically in Lama5-deleted organoids, revealing an ECM–FGF signaling interplay in mammary tumorigenesis.","method":"Conditional Lama5 deletion (prepubertal luminal), MMTV-PyMT mouse model, organoid culture, FGF receptor inhibitor treatment, gene expression analysis","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — tissue-specific conditional KO with organoid rescue, pharmacologic intervention, preprint","pmids":[],"is_preprint":true}],"current_model":"LAMA5 encodes laminin α5, which forms heterotrimeric basement membrane complexes (e.g., laminin-511/521 with β1/β2 and γ1 chains) and mechanistically functions as an ECM signaling scaffold: it binds integrin β1 to activate focal adhesion complexes (PYK2, FYN) and downstream WNT, PI3K/AKT, and STAT3 pathways; is cleaved by MMP1 to generate pro-angiogenic fragments that signal through integrin αvβ3; binds SV2A at neuromuscular synapses to regulate presynaptic quantal content; is transcriptionally activated by MAZ and suppressed by Wnt/β-catenin signaling; and is induced by TNFα/NFκB to promote branching angiogenesis and suppress Notch signaling, with its overall expression regulated by a tissue-level laminin expression monitor."},"narrative":{"teleology":[{"year":2011,"claim":"The discovery that transgenic human LAMA5 expression suppresses endogenous mouse Lama5 revealed a previously unknown tissue-level feedback mechanism—a laminin expression monitor—that controls total basement membrane laminin output, establishing that laminin α5 production is not simply constitutive but actively regulated.","evidence":"BAC transgenic mice expressing human LAMA5 in kidney, with immunoelectron microscopy and mRNA quantification","pmids":["21915268"],"confidence":"Medium","gaps":["Molecular identity of the laminin expression monitor sensor is unknown","Whether this feedback operates in non-kidney tissues is untested","Single lab, not independently confirmed"]},{"year":2012,"claim":"Knockout and knockdown studies demonstrated that laminin α5 simultaneously promotes PI3K/AKT signaling and inhibits Wnt signaling in intestinal cells, establishing it as a bifunctional signaling scaffold rather than a purely structural ECM component.","evidence":"Lama5 knockout mouse RNA profiling and cell culture knockdown with PI3K and Wnt pathway readouts","pmids":["22666383"],"confidence":"High","gaps":["Which integrin receptor mediates PI3K activation in intestinal cells is not defined","Whether PI3K promotion and Wnt inhibition are mechanistically linked or independent remains unclear"]},{"year":2016,"claim":"Two studies identified specific extracellular binding partners through which LAMA5 mediates pathological cell interactions: BCAM on tumor cells engages endothelial LAMA5 to drive colorectal cancer metastatic adhesion, while MMP1 cleavage of LAMA5 generates pro-angiogenic fragments signaling through integrin αvβ3, revealing that proteolytic processing of laminin α5 creates functionally distinct signaling species.","evidence":"Adhesion assays with shRNA suppression of BCAM/LAMA5 and BCAM-mimic peptides in vivo (metastasis); MMP1 knockdown with secretome proteomics and integrin-blocking antibodies (angiogenesis)","pmids":["27143691","27324842"],"confidence":"High","gaps":["Specific MMP1 cleavage sites on LAMA5 are not mapped at amino acid resolution","Whether BCAM–LAMA5 interaction occurs in non-colorectal cancers is unknown"]},{"year":2017,"claim":"Patient mutations defined two distinct disease mechanisms: p.Arg2659Trp disrupts the LAMA5–SV2A binding interface causing neuromuscular junction failure and congenital myasthenic syndrome, while p.V3140M perturbs proteolytic processing and activates hedgehog signaling, revealing domain-specific functions of the laminin α5 chain.","evidence":"Binding assays (LAMA5–SV2A), electrophysiology, primary neuronal culture (NMJ); patient cell expression studies with WES/RNAseq and knock-in mouse (skin/hedgehog)","pmids":["28544784","29377152","28735299"],"confidence":"High","gaps":["Structural basis for SV2A recognition by the LAMA5 LG domain is not resolved","How p.V3140M alters cleavage-derived peptide levels mechanistically is unclear"]},{"year":2018,"claim":"Endothelial cell knockdown showed that LAMA5 is required for PI3K/AKT/mTOR-dependent endothelial proliferation and survival, extending the PI3K-activating function beyond epithelial cells and linking it to vascular biology.","evidence":"siRNA knockdown in HUVECs with proliferation, apoptosis, migration, and western blot for p-AKT/p-mTOR","pmids":["30200802"],"confidence":"Medium","gaps":["Which integrin receptor mediates PI3K activation in endothelial cells is not identified","Overexpression rescue not performed","Single lab"]},{"year":2019,"claim":"TNFα/NF-κB signaling was identified as an upstream inducer of LAMA5 in colorectal metastases, and LAMA5 was shown to suppress Notch signaling in tumor endothelia to promote branching angiogenesis, establishing a myeloid-cell→TNFα→LAMA5→Notch suppression axis in the metastatic microenvironment.","evidence":"shRNA knockdown in cancer cells, orthotopic hepatic metastasis mouse models, conditioned medium from CD11b+ myeloid cells, Notch pathway gene expression","pmids":["31064120"],"confidence":"High","gaps":["Direct mechanism by which LAMA5 suppresses Notch (receptor engagement vs. ligand sequestration) is not defined","Whether this axis operates in primary tumors is untested"]},{"year":2020,"claim":"Discovery of a β1 integrin–PYK2–FYN focal adhesion signaling complex downstream of LAMA5 in skeletal cells explained the molecular mechanism of bent bone dysplasia: LAMA5 mutations disrupt this non-canonical focal adhesion pathway, impairing WNT signaling, actin organization, and cell migration.","evidence":"Exome sequencing, patient cell studies with western blot, WNT reporter assay, immunohistochemistry, migration assays","pmids":["33242826"],"confidence":"High","gaps":["Whether PYK2–FYN complex formation requires direct LAMA5–β1 integrin binding or additional co-receptors is unresolved","Structural basis for how specific LAMA5 mutations impair β1 integrin engagement is unknown"]},{"year":2021,"claim":"In vitro heterotrimer assembly and knock-in mouse studies established that LAMA5 mutations causing nephrotic syndrome act through impaired laminin-521 heterotrimer formation or reduced protein levels, distinguishing a structural/assembly defect mechanism from the signaling defects seen in bone and NMJ disease.","evidence":"In vitro heterotrimer formation assays, knock-in mouse models, glomerular proteomics, histology/ultrastructure; separate study with truncating variants and trimerization assays","pmids":["34774562","35419533"],"confidence":"High","gaps":["How partially truncated but trimerization-competent laminins cause disease is not mechanistically explained","Whether compensatory laminin isoform switching occurs in human glomeruli is unknown"]},{"year":2021,"claim":"Wnt/β-catenin signaling was shown to transcriptionally suppress Lama5 during salivary gland branching morphogenesis, with FGF acting upstream as a Wnt repressor, placing LAMA5 as a downstream effector that integrates growth factor and Wnt inputs to control epithelial branching.","evidence":"Embryonic mouse submandibular gland organ culture with Wnt3a activation, Wnt inhibitor treatment, and gene expression analysis","pmids":["33629734"],"confidence":"Medium","gaps":["Whether Wnt directly targets the Lama5 promoter or acts indirectly is not demonstrated","Relevance to other branching organs not tested","Single lab"]},{"year":2022,"claim":"A heterozygous LAMA5 variant (p.Val3687Met) was shown to impair secretion of the LG4-5 domain in a cell-type-dependent manner, establishing that domain-specific secretion defects—not just assembly failure—can cause FSGS-like glomerulopathy.","evidence":"In vitro LG4-5 secretion assay, heterozygous and homozygous knock-in mice, histopathology, immunofluorescence","pmids":["36173685"],"confidence":"Medium","gaps":["Mechanism of cell-type-dependent secretion defect is not resolved","Whether haploinsufficiency alone is sufficient or a dominant-negative effect contributes is unclear","Single lab"]},{"year":2023,"claim":"Multi-omics integration identified a LAMA5/integrin α4/STAT3 axis through which cancer-associated fibroblast-secreted LAMA5 drives pancreatic acinar-to-ductal metaplasia, while separate work showed LAMA5 activates Notch and EMT pathways in ovarian cancer, broadening the repertoire of integrin receptors and downstream pathways engaged by stromal laminin α5.","evidence":"CAF co-culture, LC-MS/MS proteomics, RNA-seq, organoid/explant models, KD validation (pancreas); shRNA knockdown with in vivo xenograft and Notch/EMT marker analysis (ovary)","pmids":["38154529","37527216"],"confidence":"High","gaps":["Whether integrin α4 engagement and STAT3 activation occur in non-pancreatic contexts is unknown","Direct binding of LAMA5 to integrin α4 has not been shown by biophysical methods"]},{"year":2023,"claim":"Ex vivo palatal organ culture demonstrated that LAMA5 is required for palatogenesis through proliferation and SHH/GLI1 signaling, extending its developmental roles beyond kidney and salivary gland to craniofacial morphogenesis.","evidence":"shRNA adenovirus transfection of E13.5 mouse palatal process, organ culture fusion assay, western blot for SHH pathway","pmids":["37390938"],"confidence":"Medium","gaps":["Whether LAMA5 directly regulates SHH ligand availability or signals intracellularly through integrins to GLI1 is not distinguished","Single lab, ex vivo only"]},{"year":2025,"claim":"Transcriptional regulation of LAMA5 was refined: MAZ directly binds the LAMA5 promoter to activate transcription feeding into STAT3 signaling in gastric cancer, and the glucocorticoid receptor was identified as a direct transcriptional activator of LAMA5 mediating stress-induced cardiomyocyte hypertrophy, revealing context-specific transcriptional inputs.","evidence":"ChIP and luciferase reporter for MAZ–LAMA5 promoter binding with STAT3 rescue (gastric cancer); GR target gene identification in vivo and in vitro (cardiomyocyte)","pmids":["40072648","40642838"],"confidence":"Medium","gaps":["Whether GR binds the LAMA5 promoter directly via GREs or indirectly is not shown by ChIP","Interaction between MAZ and GR regulation of LAMA5 in overlapping tissues is unexplored","Both single-lab studies"]},{"year":null,"claim":"Major open questions remain: the structural basis for how laminin α5 engages different integrin receptors (β1, α4, αvβ3, α6) in different tissues, how proteolytic processing generates functionally distinct fragments with specific signaling outputs, the molecular identity of the laminin expression monitor, and genotype–phenotype rules explaining why different LAMA5 mutations cause kidney, bone, NMJ, or skin disease.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of laminin-511/521 heterotrimer with integrin","Systematic domain–receptor mapping across tissue contexts is lacking","Laminin expression monitor mechanism entirely undefined at the molecular level"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[7,8]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,6,19]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[1,11]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,11,14]},{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[7,8,13,14,20]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[7,8,13,14]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,6,10,11,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,15]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,5,19]}],"complexes":["Laminin-511 (α5β1γ1)","Laminin-521 (α5β2γ1)"],"partners":["LAMB1","LAMB2","LAMC1","ITGB1","SV2A","BCAM","ITGA4","ITGAV"],"other_free_text":[]},"mechanistic_narrative":"LAMA5 encodes the laminin α5 chain, a major basement membrane glycoprotein that assembles into heterotrimeric laminins (e.g., laminin-511/521 with β1/β2 and γ1 chains) and functions as a multivalent signaling scaffold governing cell adhesion, polarity, migration, and tissue morphogenesis across diverse organ systems. Laminin α5 signals through multiple integrin receptors—β1 integrin to activate a PYK2–FYN focal adhesion complex and downstream WNT signaling in cartilage [PMID:33242826], integrin α4/STAT3 to drive acinar-to-ductal metaplasia in the pancreas [PMID:38154529], and integrin αvβ3 to mediate VEGF-independent angiogenesis upon MMP1-dependent proteolytic cleavage [PMID:27324842]—while also engaging non-integrin partners such as SV2A at neuromuscular junctions to regulate presynaptic quantal content [PMID:28544784] and BCAM on endothelial cells to mediate tumor cell adhesion during metastasis [PMID:27143691]. Mutations in LAMA5 cause nephrotic syndrome/FSGS-like glomerulopathy through impaired heterotrimer assembly or secretion [PMID:34774562, PMID:35419533, PMID:36173685], bent bone dysplasia through disrupted integrin–focal adhesion signaling [PMID:33242826], and congenital myasthenic syndrome through defective SV2A binding at neuromuscular junctions [PMID:28544784]. LAMA5 transcription is activated by the glucocorticoid receptor and MAZ, induced by TNFα/NF-κB signaling, and suppressed by canonical Wnt/β-catenin, and its expression is subject to a tissue-level laminin expression monitor that coordinately adjusts basement membrane output [PMID:21915268, PMID:31064120, PMID:33629734, PMID:40072648, PMID:40642838]."},"prefetch_data":{"uniprot":{"accession":"O15230","full_name":"Laminin subunit alpha-5","aliases":["Laminin-10 subunit alpha","Laminin-11 subunit alpha","Laminin-15 subunit alpha"],"length_aa":3695,"mass_kda":399.7,"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. Plays a role in the regulation of skeletogenesis, through a mechanism that involves integrin-mediated signaling and PTK2B/PYK2 (PubMed:33242826)","subcellular_location":"Secreted, extracellular space, extracellular matrix, basement membrane","url":"https://www.uniprot.org/uniprotkb/O15230/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LAMA5","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LAMA5","total_profiled":1310},"omim":[{"mim_id":"620076","title":"BENT BONE DYSPLASIA SYNDROME 2; BBDS2","url":"https://www.omim.org/entry/620076"},{"mim_id":"620049","title":"NEPHROTIC SYNDROME, TYPE 26; NPHS26","url":"https://www.omim.org/entry/620049"},{"mim_id":"618689","title":"NETRIN G2; NTNG2","url":"https://www.omim.org/entry/618689"},{"mim_id":"618138","title":"MUSCULAR DYSTROPHY, LIMB-GIRDLE, AUTOSOMAL RECESSIVE 23; LGMDR23","url":"https://www.omim.org/entry/618138"},{"mim_id":"614592","title":"BENT BONE DYSPLASIA SYNDROME 1; BBDS1","url":"https://www.omim.org/entry/614592"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Vesicles","reliability":"Uncertain"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/LAMA5"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O15230","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O15230","model_url":"https://alphafold.ebi.ac.uk/files/AF-O15230-2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O15230-2-F1-predicted_aligned_error_v6.png","plddt_mean":79.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LAMA5","jax_strain_url":"https://www.jax.org/strain/search?query=LAMA5"},"sequence":{"accession":"O15230","fasta_url":"https://rest.uniprot.org/uniprotkb/O15230.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O15230/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O15230"}},"corpus_meta":[{"pmid":"31064120","id":"PMC_31064120","title":"Tumour-Derived Laminin α5 (LAMA5) Promotes Colorectal Liver Metastasis Growth, Branching Angiogenesis and Notch Pathway Inhibition.","date":"2019","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/31064120","citation_count":69,"is_preprint":false},{"pmid":"27143691","id":"PMC_27143691","title":"BCAM and LAMA5 Mediate the Recognition between Tumor Cells and the Endothelium in the Metastatic Spreading of KRAS-Mutant Colorectal Cancer.","date":"2016","source":"Clinical cancer research : an official journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/27143691","citation_count":58,"is_preprint":false},{"pmid":"28735299","id":"PMC_28735299","title":"Identification of the first dominant mutation of LAMA5 gene causing a complex multisystem syndrome due to dysfunction of the extracellular matrix.","date":"2017","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28735299","citation_count":39,"is_preprint":false},{"pmid":"29764427","id":"PMC_29764427","title":"COL4A5 and LAMA5 variants co-inherited in familial hematuria: digenic inheritance or genetic modifier effect?","date":"2018","source":"BMC nephrology","url":"https://pubmed.ncbi.nlm.nih.gov/29764427","citation_count":37,"is_preprint":false},{"pmid":"28544784","id":"PMC_28544784","title":"Presynaptic congenital myasthenic syndrome with a homozygous sequence variant in LAMA5 combines myopia, facial tics, and failure of neuromuscular transmission.","date":"2017","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/28544784","citation_count":31,"is_preprint":false},{"pmid":"37527216","id":"PMC_37527216","title":"LAMA5 promotes cell proliferation and migration in ovarian cancer by activating Notch signaling pathway.","date":"2023","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/37527216","citation_count":28,"is_preprint":false},{"pmid":"38154529","id":"PMC_38154529","title":"Cancer-Associated Fibroblast Induces Acinar-to-Ductal Cell Transdifferentiation and Pancreatic Cancer Initiation Via LAMA5/ITGA4 Axis.","date":"2023","source":"Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/38154529","citation_count":27,"is_preprint":false},{"pmid":"29534211","id":"PMC_29534211","title":"Genetic variants in the LAMA5 gene in pediatric nephrotic syndrome.","date":"2019","source":"Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association","url":"https://pubmed.ncbi.nlm.nih.gov/29534211","citation_count":27,"is_preprint":false},{"pmid":"27324842","id":"PMC_27324842","title":"Transformed MDCK cells secrete elevated MMP1 that generates LAMA5 fragments promoting endothelial cell angiogenesis.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27324842","citation_count":27,"is_preprint":false},{"pmid":"22666383","id":"PMC_22666383","title":"Abnormal Wnt and PI3Kinase signaling in the malformed intestine of lama5 deficient mice.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22666383","citation_count":25,"is_preprint":false},{"pmid":"35663266","id":"PMC_35663266","title":"Recessive LAMA5 Variants Associated With Partial Epilepsy and Spasms in Infancy.","date":"2022","source":"Frontiers in molecular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/35663266","citation_count":24,"is_preprint":false},{"pmid":"30200802","id":"PMC_30200802","title":"LAMA5 promotes human umbilical vein endothelial cells migration, proliferation, and angiogenesis and is decreased in preeclampsia.","date":"2018","source":"The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians","url":"https://pubmed.ncbi.nlm.nih.gov/30200802","citation_count":18,"is_preprint":false},{"pmid":"35419533","id":"PMC_35419533","title":"Clear Evidence of LAMA5 Gene Biallelic Truncating Variants Causing Infantile Nephrotic Syndrome.","date":"2021","source":"Kidney360","url":"https://pubmed.ncbi.nlm.nih.gov/35419533","citation_count":13,"is_preprint":false},{"pmid":"30589377","id":"PMC_30589377","title":"Early posterior vitreous detachment is associated with LAMA5 dominant mutation.","date":"2018","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30589377","citation_count":11,"is_preprint":false},{"pmid":"33242826","id":"PMC_33242826","title":"Biallelic mutations in LAMA5 disrupts a skeletal noncanonical focal adhesion pathway and produces a distinct bent bone dysplasia.","date":"2020","source":"EBioMedicine","url":"https://pubmed.ncbi.nlm.nih.gov/33242826","citation_count":10,"is_preprint":false},{"pmid":"34774562","id":"PMC_34774562","title":"A novel model of nephrotic syndrome results from a point mutation in Lama5 and is modified by genetic background.","date":"2021","source":"Kidney international","url":"https://pubmed.ncbi.nlm.nih.gov/34774562","citation_count":9,"is_preprint":false},{"pmid":"29377152","id":"PMC_29377152","title":"A presynaptic congenital myasthenic syndrome attributed to a homozygous sequence variant in LAMA5.","date":"2018","source":"Annals of the New York Academy of Sciences","url":"https://pubmed.ncbi.nlm.nih.gov/29377152","citation_count":8,"is_preprint":false},{"pmid":"20951195","id":"PMC_20951195","title":"Association of a common LAMA5 variant with anthropometric and metabolic traits in an Italian cohort of healthy elderly subjects.","date":"2010","source":"Experimental gerontology","url":"https://pubmed.ncbi.nlm.nih.gov/20951195","citation_count":7,"is_preprint":false},{"pmid":"26968355","id":"PMC_26968355","title":"Association of the Laminin, Alpha 5 (LAMA5) rs4925386 with height and longevity in an elderly population from Southern Italy.","date":"2016","source":"Mechanisms of ageing and development","url":"https://pubmed.ncbi.nlm.nih.gov/26968355","citation_count":6,"is_preprint":false},{"pmid":"29908552","id":"PMC_29908552","title":"Rare Variants in LAMA5 Gene associated with FLT4 and FOXC2 Mutations in Primary Lymphedema May Contribute to Severity.","date":"2016","source":"Lymphology","url":"https://pubmed.ncbi.nlm.nih.gov/29908552","citation_count":5,"is_preprint":false},{"pmid":"36173685","id":"PMC_36173685","title":"A heterozygous LAMA5 variant may contribute to slowly progressive, vinculin-enhanced familial FSGS and pulmonary defects.","date":"2022","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/36173685","citation_count":5,"is_preprint":false},{"pmid":"21915268","id":"PMC_21915268","title":"Transgenic expression of human LAMA5 suppresses murine Lama5 mRNA and laminin α5 protein deposition.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21915268","citation_count":5,"is_preprint":false},{"pmid":"33629734","id":"PMC_33629734","title":"Canonical Wnt signaling regulates branching morphogenesis of submandibular gland by modulating levels of lama5.","date":"2021","source":"The International journal of developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/33629734","citation_count":4,"is_preprint":false},{"pmid":"37985485","id":"PMC_37985485","title":"Congenital nephrotic syndrome with diffuse mesangial sclerosis caused by compound heterozygous mutation in LAMA5 gene.","date":"2023","source":"Pediatric nephrology (Berlin, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/37985485","citation_count":3,"is_preprint":false},{"pmid":"32281736","id":"PMC_32281736","title":"Gene-based association analysis reveals involvement of LAMA5 and cell adhesion pathways in nicotine dependence in African- and European-American samples.","date":"2020","source":"Addiction biology","url":"https://pubmed.ncbi.nlm.nih.gov/32281736","citation_count":3,"is_preprint":false},{"pmid":"40694271","id":"PMC_40694271","title":"The role of LAMA5 in breast cancer progression and its potential in immunotherapy.","date":"2025","source":"Discover oncology","url":"https://pubmed.ncbi.nlm.nih.gov/40694271","citation_count":2,"is_preprint":false},{"pmid":"37632694","id":"PMC_37632694","title":"LAMA5-inspired adhesive dodecapeptide facilitates efficient dentine regeneration: An in vitro and in vivo study.","date":"2023","source":"International endodontic journal","url":"https://pubmed.ncbi.nlm.nih.gov/37632694","citation_count":2,"is_preprint":false},{"pmid":"23264881","id":"PMC_23264881","title":"Common variants in the LAMA5 gene associate with fasting plasma glucose and serum triglyceride levels in a cohort of pre-and early pubertal children.","date":"2012","source":"Journal of pediatric genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23264881","citation_count":2,"is_preprint":false},{"pmid":"40642838","id":"PMC_40642838","title":"Chronic Psychological Stress Induces Cardiomyocyte Hypertrophy Through Corticosterone-Glucocorticoid Receptor-LAMA5 Axis.","date":"2025","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/40642838","citation_count":1,"is_preprint":false},{"pmid":"37390938","id":"PMC_37390938","title":"LAMA5: A new pathogenic gene for non-syndromic cleft lip with or without cleft palate.","date":"2023","source":"Biomedical journal","url":"https://pubmed.ncbi.nlm.nih.gov/37390938","citation_count":1,"is_preprint":false},{"pmid":"9735344","id":"PMC_9735344","title":"Evaluation of Lama5 as a candidate for the mouse ragged (Ra) mutation.","date":"1998","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/9735344","citation_count":1,"is_preprint":false},{"pmid":"40072648","id":"PMC_40072648","title":"MAZ-mediated LAMA5 transcription activation promotes gastric cancer progression through the STAT3 signaling.","date":"2025","source":"Functional & integrative genomics","url":"https://pubmed.ncbi.nlm.nih.gov/40072648","citation_count":0,"is_preprint":false},{"pmid":"41098863","id":"PMC_41098863","title":"Integrated Mendelian randomization analysis reveals causal relationship between LAMA5 and bladder cancer and its metabolic mechanisms.","date":"2025","source":"Contemporary oncology (Poznan, Poland)","url":"https://pubmed.ncbi.nlm.nih.gov/41098863","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.19.689218","title":"LAMA5 deficiency disrupts ECM–WNT crosstalk in chondrogenesis and contributes to idiopathic short stature","date":"2025-11-19","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.19.689218","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.09.12.675859","title":"Patterned integrin-laminin adhesion coordinates epithelial collective cell migration","date":"2025-09-16","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.12.675859","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.09.09.675236","title":"Uncovering the role of laminin(  <i>lama5</i>  ) in maintenance of epithelial identity and polarity in bilayer zebrafish epidermis during development","date":"2025-09-15","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.09.675236","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.11.17.688818","title":"Vascular Basement Membrane Laminins Modulate Functional Zonation of Cerebral Microvessels","date":"2025-11-17","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.17.688818","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.12.26.630367","title":"Tumour-derived LAMA5 is critical for tumour initiation and controls progression and phenotype in luminal breast cancer","date":"2024-12-26","source":"bioRxiv","url":"https://doi.org/10.1101/2024.12.26.630367","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":21144,"output_tokens":5758,"usd":0.074901},"stage2":{"model":"claude-opus-4-6","input_tokens":9433,"output_tokens":4045,"usd":0.222435},"total_usd":0.297336,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2016,\n      \"finding\": \"BCAM (basal cell adhesion molecule) on tumor cells binds LAMA5 on endothelial cells, mediating adhesion of KRAS-mutant colorectal cancer cells specifically to endothelial cells (but not pericytes or hepatocytes); genetic suppression or biochemical inhibition of either BCAM or LAMA5 impaired this adhesion, and BCAM-mimic peptides inhibited metastasis in preclinical models.\",\n      \"method\": \"Adhesion assays, shRNA/genetic suppression, BCAM-mimic peptide functional inhibition, phage display identification, in vivo mouse metastasis models\",\n      \"journal\": \"Clinical Cancer Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal loss-of-function (both BCAM and LAMA5 suppressed), adhesion assays, in vivo rescue, replicated across multiple experimental formats\",\n      \"pmids\": [\"27143691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MMP1 secreted by oncogenically transformed (H-Ras) epithelial cells cleaves LAMA5, generating internal and C-terminal proteolytic fragments that promote endothelial cell angiogenesis (vessel length and branching) in a VEGF-independent manner; this pro-angiogenic effect is blocked by anti-integrin αvβ3 antibodies on endothelial cells.\",\n      \"method\": \"MMP1 knockdown (shRNA), secretome proteomics, in vitro angiogenesis assays, integrin antibody inhibition, in vivo xenograft tumors\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — substrate identification with multiple orthogonal assays (KD, secretome MS, functional angiogenesis assay, integrin blocking) in one study\",\n      \"pmids\": [\"27324842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Laminin α5 (LAMA5) promotes PI3K signaling and inhibits Wnt signaling in intestinal epithelial and mesenchymal cells; loss of LAMA5 in knockout mice causes conflicting signals that alter cell adhesion, migration, and differentiation, mechanistically linked by RNA profiling and cell culture knockdown experiments.\",\n      \"method\": \"Lama5 knockout mouse RNA profiling, cell culture knockdown, signaling pathway analysis (PI3K/Akt and Wnt pathway readouts)\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with RNA profiling plus cell culture knockdown mechanistic validation, multiple signaling pathways assessed\",\n      \"pmids\": [\"22666383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Tumor-derived LAMA5 (laminin 511) in colorectal liver metastases is induced by TNFα/NFκB signaling from CD11b+ myeloid-cell-conditioned medium; LAMA5 downregulation by shRNA impaired hepatic metastatic growth, reduced intratumoral vessel branching, and increased Notch pathway gene expression in metastasis-derived endothelia, indicating LAMA5 promotes branching angiogenesis and suppresses Notch signaling.\",\n      \"method\": \"shRNA knockdown in cancer cells, qPCR with human-specific primers, orthotopic hepatic metastasis mouse models, Notch pathway gene expression analysis, conditioned medium experiments\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined in vivo phenotype plus mechanistic pathway (TNFα/NFκB induction, Notch modulation) with multiple readouts\",\n      \"pmids\": [\"31064120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The heterozygous LAMA5 mutation p.V3140M perturbs protein cleavage-derived peptide levels and disrupts epithelial-mesenchymal signaling, causing upregulation of Sonic hedgehog (SHH) and GLI1 and strong inhibition of ECM proteins COL1A1, MMP1, and MMP3 in patient-derived cells; a knock-in mouse model recapitulated similar tissue changes.\",\n      \"method\": \"Patient-derived cell expression studies, WES/RNAseq, skin biopsy morphology, knock-in mouse model generation and analysis\",\n      \"journal\": \"Journal of Medical Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — human mutation with patient cell functional studies and knock-in mouse model, single lab\",\n      \"pmids\": [\"28735299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The LAMA5 variant p.Arg2659Trp causes decreased binding of laminin α5 to SV2A (synaptic vesicle glycoprotein 2A), impairs laminin-521 cell-adhesion, and reduces cell projection support in primary neuronal cultures, leading to profound reduction of neuromuscular junction endplate potential quantal content and presynaptic terminal degeneration.\",\n      \"method\": \"Expression studies in neuronal cells, binding assays (laminin α5 to SV2A), cell-adhesion assays, primary neuronal culture, electrophysiology (repetitive nerve stimulation, endplate recordings), electron microscopy\",\n      \"journal\": \"American Journal of Medical Genetics Part A\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — binding assay identifies SV2A as laminin α5 binding partner, combined with functional neuronal adhesion/projection assays and electrophysiological confirmation\",\n      \"pmids\": [\"28544784\", \"29377152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Loss of LAMA5 in skeletal cells disrupts a β1 integrin–PYK2–FYN focal adhesion complex, impairing non-canonical focal adhesion signaling in cartilage, negatively impacting actin cytoskeleton organization, vinculin localization, and WNT signaling, and causing a distinct bent bone dysplasia.\",\n      \"method\": \"Exome sequencing, Sanger confirmation, qPCR, western blot, immunohistochemistry, luciferase WNT reporter assay, migration/wound healing assays, patient cell studies\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (IHC, western, WNT reporter, migration) in patient-derived cells identifying the LAMA5–β1 integrin–PYK2–FYN pathway\",\n      \"pmids\": [\"33242826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A missense mutation (E884G) in the L4a domain of LAMA5 reduces LAMA5 protein levels in vivo and significantly reduces laminin 521 heterotrimer assembly in vitro; homozygous mice develop nephrotic syndrome with glomerular ultrastructural changes, and proteomic analysis revealed altered glomerular ECM composition.\",\n      \"method\": \"Mouse knock-in model, in vitro heterotrimer assembly assay, proteomics of glomerular ECM, histology, ultrastructural analysis\",\n      \"journal\": \"Kidney International\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro heterotrimer formation assay plus in vivo mouse model with proteomics, multiple orthogonal methods\",\n      \"pmids\": [\"34774562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Truncating LAMA5 variants produce shorter laminin α5 proteins that still form trimers with laminin β1 and γ1 chains, as demonstrated by in vitro heterotrimer formation assays, establishing that partial truncation does not abolish trimerization but causes infantile nephrotic syndrome.\",\n      \"method\": \"In vitro heterotrimer formation assay, targeted next-generation sequencing, clinical phenotyping\",\n      \"journal\": \"Kidney360\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution assay, single lab, single study\",\n      \"pmids\": [\"35419533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Canonical Wnt/β-catenin signaling regulates submandibular gland branching morphogenesis through modulation of Lama5 levels; FGF signaling acts upstream as a negative regulator of canonical Wnt, and Wnt inhibition promotes while Wnt overactivation suppresses epithelial branching, with Lama5 as a downstream effector.\",\n      \"method\": \"Embryonic mouse SMG organ culture, morphogenesis assays, gene expression analysis, Wnt pathway inhibitor/activator (Wnt3a) treatments\",\n      \"journal\": \"International Journal of Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — epistasis established in organ culture model with pharmacologic pathway manipulation, single lab\",\n      \"pmids\": [\"33629734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LAMA5 knockdown in human umbilical vein endothelial cells (HUVECs) decreases proliferation, migration, and vascular tube formation and increases apoptosis; mechanistically, reduced LAMA5 inhibits PI3K downstream p-AKT and p-mTOR protein expression.\",\n      \"method\": \"siRNA knockdown, CCK-8 proliferation assay, flow cytometry apoptosis, transwell migration, western blot of PI3K/AKT/mTOR pathway\",\n      \"journal\": \"Journal of Maternal-Fetal and Neonatal Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD with defined cellular phenotype and signaling pathway readout, single lab\",\n      \"pmids\": [\"30200802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CAF-secreted LAMA5 signals through integrin α4 and STAT3 to drive acinar-to-ductal metaplasia in pancreatic cells; proteomic and transcriptomic integration identified the LAMA5/integrin α4/STAT3 axis, validated by KD experiments in cell lines, acinar explant co-cultures, and mouse models.\",\n      \"method\": \"CAF co-culture, conditioned medium experiments, LC-MS/MS proteomics, RNA-seq, confocal microscopy, immunoblotting, qRT-PCR, organoid and explant models\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multi-omics integration with functional validation across multiple model systems (cell lines, organoids, explants, mouse) identifying a specific signaling axis\",\n      \"pmids\": [\"38154529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LAMA5 knockdown in ovarian cancer cells inhibits cell proliferation, migration, and invasion in vitro and in vivo and reduces expression of EMT markers and Notch signaling pathway-related markers, placing LAMA5 upstream of Notch and EMT programs.\",\n      \"method\": \"Lentiviral shRNA knockdown, in vitro proliferation/migration/invasion assays, in vivo xenograft, western blot/qPCR for Notch and EMT markers\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KD with in vivo and in vitro phenotypes plus signaling pathway readouts, single lab\",\n      \"pmids\": [\"37527216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A heterozygous LAMA5 variant (p.Val3687Met) impairs secretion of the laminin α5 LG4-5 domain in a cell-type-dependent manner; knockin mice develop FSGS-like glomerulopathy with reduced laminin α5 and increased glomerular vinculin levels, indicating that impaired LAMA5 secretion and consequent defective cell adhesion underlie the glomerulopathy.\",\n      \"method\": \"In vitro secretion assay of LG4-5 domain, knockin mouse model (heterozygous and homozygous), histopathology, immunofluorescence for laminin α5 and vinculin\",\n      \"journal\": \"JCI Insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro functional assay plus knockin mouse model, single lab\",\n      \"pmids\": [\"36173685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human LAMA5 transgene expression in mouse kidney suppresses endogenous mouse Lama5 mRNA and laminin α5 protein deposition, demonstrating the existence of a laminin expression monitor in kidney that regulates overall production of basement membrane protein; human laminin α5 is deposited from both glomerular endothelial cells and podocytes.\",\n      \"method\": \"Transgenic mice (BAC-based human LAMA5), immunoelectron microscopy, northern/western blot, mRNA quantification\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct transgenic experiment with immunoelectron microscopy and RNA quantification, single lab\",\n      \"pmids\": [\"21915268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LAMA5 silencing in murine palatal process cells causes cleft palate by inhibiting cell proliferation (reduced ki67, cyclin D1) and promoting apoptosis (increased caspase 3), and interferes with the SHH signaling pathway (reduced GLI1) without affecting EMT markers or Shh/Ptch1 expression.\",\n      \"method\": \"shRNA adenovirus transfection of E13.5 mouse palatal process, ex vivo organ culture fusion assay, PCR, western blot\",\n      \"journal\": \"Biomedical Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct KD in ex vivo organ culture with specific molecular readouts, single lab\",\n      \"pmids\": [\"37390938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Glucocorticoid receptor (GR) directly targets LAMA5 as a transcriptional target gene; corticosterone-GR-LAMA5 axis mediates chronic psychological stress-induced cardiomyocyte hypertrophy, validated in vivo and in vitro.\",\n      \"method\": \"Animal stress models, in vitro cardiomyocyte experiments, GR target gene identification (confirmed in vivo and in vitro)\",\n      \"journal\": \"Advanced Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — GR-LAMA5 transcriptional axis confirmed in vivo and in vitro, single lab\",\n      \"pmids\": [\"40642838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MAZ (Myc-associated zinc finger protein) transcription factor binds the LAMA5 promoter and activates LAMA5 transcription; LAMA5 in turn activates STAT3 signaling to promote gastric cancer cell proliferation and migration.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, shRNA knockdown of MAZ and LAMA5, STAT3 activator rescue (Colivelin), CCK-8, colony formation, wound healing, Transwell assays, in vivo tumor models\",\n      \"journal\": \"Functional & Integrative Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and luciferase confirm direct MAZ-LAMA5 transcriptional regulation, rescue experiments confirm LAMA5-STAT3 axis, single lab\",\n      \"pmids\": [\"40072648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Loss of LAMA5 in human urine-derived stem cells impairs chondrogenesis and disrupts WNT signaling; WNT7A and FLI1 are key dysregulated genes, and pharmacologic WNT activation (LiCl) partially restores their expression, indicating LAMA5 is required for ECM–WNT signaling integration during chondrogenesis.\",\n      \"method\": \"CRISPR/Cas9 LAMA5 knockout, 2D/3D chondrogenic differentiation, bulk RNA-seq, WGCNA, LiCl pharmacologic rescue, qPCR\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with transcriptomics and pharmacologic rescue, preprint not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In zebrafish, laminin α5 (Lama5) interacts with integrin α6b to maintain apicobasal polarity and epithelial identity in basal epidermal cells; loss of Lama5 reduces E-cadherin localization and promotes mesenchymal traits, and the integrin α6b mutant phenotype is not exacerbated in the double mutant, placing Lama5 and integrin α6b in the same pathway.\",\n      \"method\": \"Zebrafish lama5 loss-of-function, integrin α6b mutant, double mutant epistasis, confocal imaging of E-cadherin and polarity markers\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in zebrafish with direct imaging of molecular readouts, preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In zebrafish posterior lateral line primordium, laminin α5 (Lama5) is a key basement membrane component underlying migrating epithelial cells; simultaneous depletion of lama5 and itga6b (integrin α6b) markedly decreases collective migration velocity and ultimately blocks migration, whereas loss of lama5 alone compromises basement membrane integrity without impairing migration, revealing redundancy between Lama5 and integrin α6b adhesion systems.\",\n      \"method\": \"Zebrafish lama5 and itga6b loss-of-function, double mutant/morphant analysis, live imaging of collective cell migration\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with quantitative live imaging in vivo, preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In cerebral blood vessels, endothelial-specific loss of laminin α5 (Tek-cre:Lama5-/-) alters vascular zonation and junctional protein expression; compensatory upregulation of laminin α5 in Lama4-/- vessels enhances expression of junctional proteins (Ocln, Cldn5) and promotes vessel contractility, demonstrating that laminin α4/α5 ratios regulate functional zonation between arterioles, capillaries, and postcapillary venules.\",\n      \"method\": \"Single-cell RNA sequencing of cerebral blood vessels from conditional KO and Lama4-/- mice, in vitro and in vivo studies, transcriptomic profiling\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — scRNA-seq with conditional KO models and in vitro/in vivo validation, preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Luminal deletion of Lama5 in MMTV-PyMT mice markedly reduces emergence of early mammary hyperplasias and shifts phenotype from mature HR+ luminal epithelial to HR+ progenitor; biallelic Lama5 deletion causes widespread ECM and FGF signaling alterations including overexpression of Fgfr2, and inhibition of FGF receptors induces apoptosis specifically in Lama5-deleted organoids, revealing an ECM–FGF signaling interplay in mammary tumorigenesis.\",\n      \"method\": \"Conditional Lama5 deletion (prepubertal luminal), MMTV-PyMT mouse model, organoid culture, FGF receptor inhibitor treatment, gene expression analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific conditional KO with organoid rescue, pharmacologic intervention, preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"LAMA5 encodes laminin α5, which forms heterotrimeric basement membrane complexes (e.g., laminin-511/521 with β1/β2 and γ1 chains) and mechanistically functions as an ECM signaling scaffold: it binds integrin β1 to activate focal adhesion complexes (PYK2, FYN) and downstream WNT, PI3K/AKT, and STAT3 pathways; is cleaved by MMP1 to generate pro-angiogenic fragments that signal through integrin αvβ3; binds SV2A at neuromuscular synapses to regulate presynaptic quantal content; is transcriptionally activated by MAZ and suppressed by Wnt/β-catenin signaling; and is induced by TNFα/NFκB to promote branching angiogenesis and suppress Notch signaling, with its overall expression regulated by a tissue-level laminin expression monitor.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"LAMA5 encodes the laminin α5 chain, a major basement membrane glycoprotein that assembles into heterotrimeric laminins (e.g., laminin-511/521 with β1/β2 and γ1 chains) and functions as a multivalent signaling scaffold governing cell adhesion, polarity, migration, and tissue morphogenesis across diverse organ systems. Laminin α5 signals through multiple integrin receptors—β1 integrin to activate a PYK2–FYN focal adhesion complex and downstream WNT signaling in cartilage [PMID:33242826], integrin α4/STAT3 to drive acinar-to-ductal metaplasia in the pancreas [PMID:38154529], and integrin αvβ3 to mediate VEGF-independent angiogenesis upon MMP1-dependent proteolytic cleavage [PMID:27324842]—while also engaging non-integrin partners such as SV2A at neuromuscular junctions to regulate presynaptic quantal content [PMID:28544784] and BCAM on endothelial cells to mediate tumor cell adhesion during metastasis [PMID:27143691]. Mutations in LAMA5 cause nephrotic syndrome/FSGS-like glomerulopathy through impaired heterotrimer assembly or secretion [PMID:34774562, PMID:35419533, PMID:36173685], bent bone dysplasia through disrupted integrin–focal adhesion signaling [PMID:33242826], and congenital myasthenic syndrome through defective SV2A binding at neuromuscular junctions [PMID:28544784]. LAMA5 transcription is activated by the glucocorticoid receptor and MAZ, induced by TNFα/NF-κB signaling, and suppressed by canonical Wnt/β-catenin, and its expression is subject to a tissue-level laminin expression monitor that coordinately adjusts basement membrane output [PMID:21915268, PMID:31064120, PMID:33629734, PMID:40072648, PMID:40642838].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"The discovery that transgenic human LAMA5 expression suppresses endogenous mouse Lama5 revealed a previously unknown tissue-level feedback mechanism—a laminin expression monitor—that controls total basement membrane laminin output, establishing that laminin α5 production is not simply constitutive but actively regulated.\",\n      \"evidence\": \"BAC transgenic mice expressing human LAMA5 in kidney, with immunoelectron microscopy and mRNA quantification\",\n      \"pmids\": [\"21915268\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular identity of the laminin expression monitor sensor is unknown\", \"Whether this feedback operates in non-kidney tissues is untested\", \"Single lab, not independently confirmed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Knockout and knockdown studies demonstrated that laminin α5 simultaneously promotes PI3K/AKT signaling and inhibits Wnt signaling in intestinal cells, establishing it as a bifunctional signaling scaffold rather than a purely structural ECM component.\",\n      \"evidence\": \"Lama5 knockout mouse RNA profiling and cell culture knockdown with PI3K and Wnt pathway readouts\",\n      \"pmids\": [\"22666383\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which integrin receptor mediates PI3K activation in intestinal cells is not defined\", \"Whether PI3K promotion and Wnt inhibition are mechanistically linked or independent remains unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Two studies identified specific extracellular binding partners through which LAMA5 mediates pathological cell interactions: BCAM on tumor cells engages endothelial LAMA5 to drive colorectal cancer metastatic adhesion, while MMP1 cleavage of LAMA5 generates pro-angiogenic fragments signaling through integrin αvβ3, revealing that proteolytic processing of laminin α5 creates functionally distinct signaling species.\",\n      \"evidence\": \"Adhesion assays with shRNA suppression of BCAM/LAMA5 and BCAM-mimic peptides in vivo (metastasis); MMP1 knockdown with secretome proteomics and integrin-blocking antibodies (angiogenesis)\",\n      \"pmids\": [\"27143691\", \"27324842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific MMP1 cleavage sites on LAMA5 are not mapped at amino acid resolution\", \"Whether BCAM–LAMA5 interaction occurs in non-colorectal cancers is unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Patient mutations defined two distinct disease mechanisms: p.Arg2659Trp disrupts the LAMA5–SV2A binding interface causing neuromuscular junction failure and congenital myasthenic syndrome, while p.V3140M perturbs proteolytic processing and activates hedgehog signaling, revealing domain-specific functions of the laminin α5 chain.\",\n      \"evidence\": \"Binding assays (LAMA5–SV2A), electrophysiology, primary neuronal culture (NMJ); patient cell expression studies with WES/RNAseq and knock-in mouse (skin/hedgehog)\",\n      \"pmids\": [\"28544784\", \"29377152\", \"28735299\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for SV2A recognition by the LAMA5 LG domain is not resolved\", \"How p.V3140M alters cleavage-derived peptide levels mechanistically is unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Endothelial cell knockdown showed that LAMA5 is required for PI3K/AKT/mTOR-dependent endothelial proliferation and survival, extending the PI3K-activating function beyond epithelial cells and linking it to vascular biology.\",\n      \"evidence\": \"siRNA knockdown in HUVECs with proliferation, apoptosis, migration, and western blot for p-AKT/p-mTOR\",\n      \"pmids\": [\"30200802\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which integrin receptor mediates PI3K activation in endothelial cells is not identified\", \"Overexpression rescue not performed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"TNFα/NF-κB signaling was identified as an upstream inducer of LAMA5 in colorectal metastases, and LAMA5 was shown to suppress Notch signaling in tumor endothelia to promote branching angiogenesis, establishing a myeloid-cell→TNFα→LAMA5→Notch suppression axis in the metastatic microenvironment.\",\n      \"evidence\": \"shRNA knockdown in cancer cells, orthotopic hepatic metastasis mouse models, conditioned medium from CD11b+ myeloid cells, Notch pathway gene expression\",\n      \"pmids\": [\"31064120\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism by which LAMA5 suppresses Notch (receptor engagement vs. ligand sequestration) is not defined\", \"Whether this axis operates in primary tumors is untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Discovery of a β1 integrin–PYK2–FYN focal adhesion signaling complex downstream of LAMA5 in skeletal cells explained the molecular mechanism of bent bone dysplasia: LAMA5 mutations disrupt this non-canonical focal adhesion pathway, impairing WNT signaling, actin organization, and cell migration.\",\n      \"evidence\": \"Exome sequencing, patient cell studies with western blot, WNT reporter assay, immunohistochemistry, migration assays\",\n      \"pmids\": [\"33242826\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PYK2–FYN complex formation requires direct LAMA5–β1 integrin binding or additional co-receptors is unresolved\", \"Structural basis for how specific LAMA5 mutations impair β1 integrin engagement is unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"In vitro heterotrimer assembly and knock-in mouse studies established that LAMA5 mutations causing nephrotic syndrome act through impaired laminin-521 heterotrimer formation or reduced protein levels, distinguishing a structural/assembly defect mechanism from the signaling defects seen in bone and NMJ disease.\",\n      \"evidence\": \"In vitro heterotrimer formation assays, knock-in mouse models, glomerular proteomics, histology/ultrastructure; separate study with truncating variants and trimerization assays\",\n      \"pmids\": [\"34774562\", \"35419533\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How partially truncated but trimerization-competent laminins cause disease is not mechanistically explained\", \"Whether compensatory laminin isoform switching occurs in human glomeruli is unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Wnt/β-catenin signaling was shown to transcriptionally suppress Lama5 during salivary gland branching morphogenesis, with FGF acting upstream as a Wnt repressor, placing LAMA5 as a downstream effector that integrates growth factor and Wnt inputs to control epithelial branching.\",\n      \"evidence\": \"Embryonic mouse submandibular gland organ culture with Wnt3a activation, Wnt inhibitor treatment, and gene expression analysis\",\n      \"pmids\": [\"33629734\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Wnt directly targets the Lama5 promoter or acts indirectly is not demonstrated\", \"Relevance to other branching organs not tested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A heterozygous LAMA5 variant (p.Val3687Met) was shown to impair secretion of the LG4-5 domain in a cell-type-dependent manner, establishing that domain-specific secretion defects—not just assembly failure—can cause FSGS-like glomerulopathy.\",\n      \"evidence\": \"In vitro LG4-5 secretion assay, heterozygous and homozygous knock-in mice, histopathology, immunofluorescence\",\n      \"pmids\": [\"36173685\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of cell-type-dependent secretion defect is not resolved\", \"Whether haploinsufficiency alone is sufficient or a dominant-negative effect contributes is unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Multi-omics integration identified a LAMA5/integrin α4/STAT3 axis through which cancer-associated fibroblast-secreted LAMA5 drives pancreatic acinar-to-ductal metaplasia, while separate work showed LAMA5 activates Notch and EMT pathways in ovarian cancer, broadening the repertoire of integrin receptors and downstream pathways engaged by stromal laminin α5.\",\n      \"evidence\": \"CAF co-culture, LC-MS/MS proteomics, RNA-seq, organoid/explant models, KD validation (pancreas); shRNA knockdown with in vivo xenograft and Notch/EMT marker analysis (ovary)\",\n      \"pmids\": [\"38154529\", \"37527216\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether integrin α4 engagement and STAT3 activation occur in non-pancreatic contexts is unknown\", \"Direct binding of LAMA5 to integrin α4 has not been shown by biophysical methods\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Ex vivo palatal organ culture demonstrated that LAMA5 is required for palatogenesis through proliferation and SHH/GLI1 signaling, extending its developmental roles beyond kidney and salivary gland to craniofacial morphogenesis.\",\n      \"evidence\": \"shRNA adenovirus transfection of E13.5 mouse palatal process, organ culture fusion assay, western blot for SHH pathway\",\n      \"pmids\": [\"37390938\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether LAMA5 directly regulates SHH ligand availability or signals intracellularly through integrins to GLI1 is not distinguished\", \"Single lab, ex vivo only\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Transcriptional regulation of LAMA5 was refined: MAZ directly binds the LAMA5 promoter to activate transcription feeding into STAT3 signaling in gastric cancer, and the glucocorticoid receptor was identified as a direct transcriptional activator of LAMA5 mediating stress-induced cardiomyocyte hypertrophy, revealing context-specific transcriptional inputs.\",\n      \"evidence\": \"ChIP and luciferase reporter for MAZ–LAMA5 promoter binding with STAT3 rescue (gastric cancer); GR target gene identification in vivo and in vitro (cardiomyocyte)\",\n      \"pmids\": [\"40072648\", \"40642838\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether GR binds the LAMA5 promoter directly via GREs or indirectly is not shown by ChIP\", \"Interaction between MAZ and GR regulation of LAMA5 in overlapping tissues is unexplored\", \"Both single-lab studies\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions remain: the structural basis for how laminin α5 engages different integrin receptors (β1, α4, αvβ3, α6) in different tissues, how proteolytic processing generates functionally distinct fragments with specific signaling outputs, the molecular identity of the laminin expression monitor, and genotype–phenotype rules explaining why different LAMA5 mutations cause kidney, bone, NMJ, or skin disease.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal or cryo-EM structure of laminin-511/521 heterotrimer with integrin\", \"Systematic domain–receptor mapping across tissue contexts is lacking\", \"Laminin expression monitor mechanism entirely undefined at the molecular level\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 6, 19]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [1, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 11, 14]},\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [7, 8, 13, 14, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [7, 8, 13, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 6, 10, 11, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 15]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 5, 19]}\n    ],\n    \"complexes\": [\n      \"Laminin-511 (α5β1γ1)\",\n      \"Laminin-521 (α5β2γ1)\"\n    ],\n    \"partners\": [\n      \"LAMB1\",\n      \"LAMB2\",\n      \"LAMC1\",\n      \"ITGB1\",\n      \"SV2A\",\n      \"BCAM\",\n      \"ITGA4\",\n      \"ITGAV\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}