{"gene":"LAMB1","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1987,"finding":"Human LAMB1 encodes a 1786-amino-acid multidomain protein with two types of internal homology repeats: type A repeats (~50 aa, 8 cysteines) clustered in two NH2-terminal groups, and type B repeats (~40 aa) near the COOH-terminus, with structurally distinct domains including cysteine-rich repeats, globular regions, and helical structures. The LAMB1 gene was mapped to chromosome 7q22 by somatic cell hybrid methodology and in situ hybridization.","method":"cDNA cloning, sequence analysis, somatic cell hybrid mapping, in situ hybridization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — complete sequence determination with domain analysis, chromosomal mapping confirmed by two orthogonal methods","pmids":["3611077"],"is_preprint":false},{"year":1997,"finding":"The cAMP/PKA signaling pathway regulates LAMB1 gene expression; a dominant-negative regulatory subunit of PKA reduced activation of the LAMB1 DNase I hypersensitivity site 2 enhancer (measured by CAT assay), and reduced protein binding at the C2 motif within this enhancer region after retinoic acid and cAMP treatment, indicating PKA is involved in inducing the C2-binding protein.","method":"Stable transfection of dominant-negative PKA regulatory subunit, CAT (chloramphenicol acetyltransferase) reporter assay, electrophoretic mobility shift assay (EMSA), in vitro phosphorylation","journal":"Cell growth & differentiation","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (CAT assay, EMSA, in vitro phosphorylation) in a single lab","pmids":["9419418"],"is_preprint":false},{"year":1997,"finding":"Approximately 4 kb of LAMB1 5' flanking sequence drives tissue-specific expression in kidney, mammary gland, and genital systems; the first 0.7 kb is sufficient to direct expression specifically in prospermatogonia, while oocyte and mesonephric duct expression requires elements within 4 kb of the transcription start site.","method":"Transgenic mouse lines with LAMB1 promoter-lacZ fusions, beta-galactosidase reporter assay","journal":"Differentiation; research in biological diversity","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional dissection of cis-regulatory elements using transgenic reporter mice","pmids":["9447707"],"is_preprint":false},{"year":2015,"finding":"A dominant missense mutation in mouse Lamb1 (lamb1t) causes a dystonia-like movement disorder; electrophysiological recording showed abnormal output from cerebellar Purkinje cells and deep cerebellar nucleus neurons (both Lamb1-expressing) during abnormal postures, indicating that LAMB1 dysfunction in CNS extracellular matrix disrupts descending inhibitory circuits and exposes excess spinal cord activity.","method":"SNP mapping, exome sequencing, EMG (co-contraction analysis), in vivo cerebellar electrophysiology in awake mice","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — genetic identification of causative mutation plus in vivo neurophysiology linking LAMB1 to specific circuit dysfunction, multiple orthogonal methods","pmids":["26705335"],"is_preprint":false},{"year":2021,"finding":"LAMB1 C-terminally truncated variants that escape nonsense-mediated mRNA decay are expressed as truncated proteins trapped in the cytosol (rather than secreted to the extracellular matrix), as demonstrated by western blotting with N- and C-terminal antibodies in patient fibroblasts; these variants cause cerebral small vessel disease with hippocampal memory defects and leukoencephalopathy.","method":"Western blotting with N- and C-terminal antibodies, patient fibroblast analysis, gene-based collapsing test of exome data","journal":"Annals of neurology","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein localization in patient cells using two-antibody approach demonstrating cytosolic retention","pmids":["34606115"],"is_preprint":false},{"year":2021,"finding":"ERK/c-Jun signaling axis drives LAMB1 transcription; c-Jun directly binds to the LAMB1 promoter as a transcription factor and the ERK inhibitor U0126 suppresses LAMB1 expression; elevated LAMB1 promotes gastric cancer cell proliferation, invasion, and migration.","method":"ERK inhibitor treatment, chromatin immunoprecipitation (ChIP) showing c-Jun binding to LAMB1 promoter, LAMB1 overexpression and knockdown with proliferation/invasion/migration assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP demonstrating direct promoter binding, pharmacological inhibition, and functional rescue experiments","pmids":["33435161"],"is_preprint":false},{"year":2014,"finding":"miR-124-5p directly suppresses LAMB1 protein expression post-transcriptionally; restoration of miR-124-5p in glioma cells reduced LAMB1 protein levels, suppressed tumor growth and angiogenesis—effects also produced by direct LAMB1 knockdown.","method":"miR-124-5p restoration, western blotting, qPCR, cell proliferation, colony formation, in vivo tumor growth and angiogenesis assays","journal":"Neuro-oncology","confidence":"Medium","confidence_rationale":"Tier 2 — miRNA restoration and direct LAMB1 knockdown producing parallel phenotypes, confirmed in vivo","pmids":["24497408"],"is_preprint":false},{"year":2022,"finding":"DDX24 binds the mRNA of LAMB1 at nucleotides 618–624 and increases LAMB1 mRNA stability in a manner dependent on interaction between nucleolin and the C-terminal region of DDX24, thereby promoting HCC cell migration and proliferation; RFX8 transcriptionally upregulates DDX24 to drive this axis.","method":"RNA immunoprecipitation (DDX24-LAMB1 mRNA binding), co-immunoprecipitation (DDX24-nucleolin interaction), mRNA stability assay, overexpression/knockdown of DDX24 and LAMB1, in vivo tumor model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — direct RNA binding demonstrated, protein interaction mapped, mRNA stability quantified, in vivo validation; multiple orthogonal methods","pmids":["35763670"],"is_preprint":false},{"year":2023,"finding":"LAMB1 physically interacts with FAK (focal adhesion kinase) at cell-substrate interfaces, and this binding transduces mechanical stiffness signals into MEK1/2 activation to drive dentinogenesis in odontoblast-like cells.","method":"Immunoprecipitation (LAMB1-FAK interaction), immunofluorescent staining, western blotting, substrate stiffness modulation using polydimethylsiloxane, qPCR","journal":"Oral diseases","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein interaction confirmed by co-IP, functional mechanosignaling assay with defined pathway readout","pmids":["36519511"],"is_preprint":false},{"year":2025,"finding":"Vascular LAMB1 provides a haptotactic gradient for retinal microglial precursors sensed by integrin alpha-6 (Itga6) on microglial precursors, which activates Rac1 signaling to promote F-actin polarization and directional migration into the retina; disruption of this Lamb1-Itga6 axis in zebrafish blocked vitreous entry and retinal colonization, and endothelial-specific LAMB1 deficiency in mice similarly impaired microglial precursor settlement.","method":"Zebrafish genetics (Lamb1 and Itga6 disruption), mouse endothelial-specific knockout, live imaging, F-actin polarization assays, Rac1 signaling assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — conserved pathway validated in two species (zebrafish and mouse) with cell-type-specific knockout, multiple orthogonal readouts","pmids":["41206867"],"is_preprint":false},{"year":2025,"finding":"Drosophila LanB1 (LAMB1 ortholog) localizes to the blood-brain barrier (BBB) in adult fly brains in a subset of glia cells; BBB-specific knockdown causes shortened lifespan and locomotor defects. In vitro assay in HEK293T cells showed that late-truncated LAMB1 is uniquely detected as a monomer in the culture medium, suggesting a dominant gain-of-function mechanism for C-terminal truncation variants causing dominant leukoencephalopathy, while frameshift variants behave as strong loss-of-function alleles.","method":"Drosophila genetics (tissue-specific knockdown), in vivo rescue experiments with analogous variants, HEK293T cell culture and western blotting of conditioned medium","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo fly genetics plus in vitro mechanistic assay; ortholog functional validation with human variant analysis","pmids":["40237576"],"is_preprint":false},{"year":2025,"finding":"LAMB1 activates the NF-κB pathway to upregulate HK2 and promote aerobic glycolysis in glioma cells; pharmacological inhibition of NF-κB (Bay 11-7082) or LAMB1 knockdown suppressed glycolysis (reduced ECAR, glucose uptake, lactate production), cell proliferation, invasion, and enhanced temozolomide sensitivity in vitro and reduced tumor growth in vivo.","method":"LAMB1 overexpression/knockdown, Seahorse ECAR measurement, glucose/lactate assays, NF-κB inhibitor (Bay 11-7082), western blotting (HK1, HK2, PDHA, PKM), subcutaneous tumor model","journal":"Discover oncology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple functional assays with pathway inhibitor validation and in vivo confirmation","pmids":["39920513"],"is_preprint":false},{"year":2025,"finding":"LAMB1 promotes fracture healing by activating the Wnt/β-catenin signaling pathway to upregulate VEGFA expression in endothelial cells, thereby promoting EC proliferation, migration, and tube formation; siRNA knockdown of LAMB1 suppressed wnt3a, GSK-3β, β-catenin, and VEGFA expression, and co-treatment with a Wnt activator (HY-141873) partially reversed these effects.","method":"scRNA-seq analysis, siRNA knockdown of LAMB1 in HUVECs, qRT-PCR, immunofluorescence, transwell assay, tube formation assay, western blotting","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA knockdown with pathway rescue experiment using Wnt activator, multiple orthogonal assays","pmids":["40221061"],"is_preprint":false},{"year":2025,"finding":"LAMB1 modulates complement C3-mediated antiviral activity; LAMB1 expression promotes C3 upregulation following rotavirus infection, and miR-365-1-5p downregulates LAMB1 to inhibit the C3 antiviral response; lncRNA DARVR acts as a competing endogenous RNA for miR-365-1-5p, restoring LAMB1 expression and enhancing C3-dependent inhibition of rotavirus replication.","method":"lncRNA-miRNA-mRNA axis characterization, miR-365-1-5p overexpression/inhibition, LAMB1 knockdown/overexpression, C3 expression assays, rotavirus replication assays in MA104 cells","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 — ceRNA mechanism validated with multiple functional assays showing LAMB1-dependent C3 regulation and antiviral effect","pmids":["40237496"],"is_preprint":false},{"year":2026,"finding":"In a preprint/early online study of cortical brain development, LAMB1 protein and its receptors RPSA and ITGB1 were imbalanced when LIN28A and CTNNB1 were co-activated, correlating with a porous pial border and overmigration of neural cells, suggesting LAMB1's role in maintaining extracellular matrix integrity at the pial surface to prevent cobblestone lissencephaly-like cortical dysgenesis.","method":"Spatially resolved proteome analysis of mouse embryonic brains, histomorphological analysis","journal":"bioRxiv (preprint)","confidence":"Low","confidence_rationale":"Tier 3 — preprint, single proteomics approach, correlative rather than direct functional manipulation of LAMB1","pmids":[],"is_preprint":true},{"year":2026,"finding":"LAMB1 silencing in a SCH rat model reduced ITGB1 and integrin-related signaling through the COL3A1/RAC1 axis; in vitro, LAMB1 knockdown in HTR-8/SVneo trophoblasts enhanced proliferation, migration, and invasion while reducing pro-inflammatory cytokines, indicating LAMB1 promotes inflammation and coagulation dysfunction via COL3A1/RAC1 regulation.","method":"LAMB1 knockdown in vivo (LPS-induced SCH rat model) and in vitro (trophoblast cells), proteomic and transcriptomic analysis, cytokine measurement","journal":"BMC biology","confidence":"Medium","confidence_rationale":"Tier 2 — combined in vivo knockout and in vitro knockdown with pathway identification via proteomics and transcriptomics","pmids":["41840580"],"is_preprint":false}],"current_model":"LAMB1 encodes the β1 chain of laminin, a multidomain extracellular matrix glycoprotein that assembles into the basement membrane where it serves as a haptotactic and structural cue: it physically interacts with integrins (Itga6, ITGB1) to activate downstream signaling (Rac1/F-actin, FAK-MEK1/2, RhoA), regulates complement C3 activity, drives Wnt/β-catenin and NF-κB/HK2 pathway activation, and is transcriptionally controlled by ERK/c-Jun and PKA; its mRNA stability is post-transcriptionally regulated by DDX24/nucleolin, and miR-124-5p suppresses its translation, with loss-of-function causing leukoencephalopathy, dystonia-like movement disorders, and developmental brain malformations due to failed basement membrane secretion."},"narrative":{"teleology":[{"year":1987,"claim":"Determining the full primary structure and chromosomal location of LAMB1 established its multidomain architecture—cysteine-rich repeats, globular regions, and helical segments—providing the first molecular framework for understanding laminin β1 chain function.","evidence":"cDNA cloning, sequence analysis, somatic cell hybrid mapping, and in situ hybridization localized the gene to chromosome 7q22","pmids":["3611077"],"confidence":"High","gaps":["No three-dimensional structure of the full-length protein","Functional significance of individual domain repeats not tested"]},{"year":1997,"claim":"Identification of cAMP/PKA and cis-regulatory elements controlling LAMB1 transcription revealed that its expression is actively regulated rather than constitutive, with tissue-specific promoter elements directing expression in kidney, mammary gland, and germ cells.","evidence":"Dominant-negative PKA, CAT reporter assays, EMSA in cell lines; transgenic LAMB1 promoter-lacZ mice showing tissue-specific reporter expression","pmids":["9419418","9447707"],"confidence":"Medium","gaps":["Identity of the C2 motif-binding transcription factor not determined","Promoter elements for CNS expression not mapped"]},{"year":2014,"claim":"Demonstrating that miR-124-5p directly suppresses LAMB1 protein and that LAMB1 knockdown phenocopies miR-124-5p restoration in glioma established LAMB1 as a post-transcriptionally regulated oncogenic effector in brain tumors.","evidence":"miR-124-5p restoration and direct LAMB1 knockdown in glioma cells with parallel reduction in proliferation, colony formation, and in vivo tumor growth","pmids":["24497408"],"confidence":"Medium","gaps":["Direct miRNA-target binding site validation (e.g., luciferase reporter with mutant 3′-UTR) not shown in this study","Downstream signaling pathway mediating LAMB1-driven glioma growth not identified"]},{"year":2015,"claim":"A dominant missense Lamb1 mutation causing dystonia-like movement disorder in mice linked LAMB1 to CNS circuit function, showing that basement membrane disruption in the cerebellum leads to aberrant Purkinje cell and deep cerebellar nucleus output.","evidence":"SNP mapping, exome sequencing of mouse mutant; in vivo cerebellar electrophysiology and EMG co-contraction analysis in awake mice","pmids":["26705335"],"confidence":"High","gaps":["Precise mechanism by which the missense mutation disrupts laminin trimer assembly or ECM integration not resolved","Whether the same circuit dysfunction occurs in human patients unknown"]},{"year":2021,"claim":"Two advances clarified LAMB1's transcriptional regulation and its role in human disease: ERK/c-Jun was shown to directly activate LAMB1 transcription via promoter binding, and C-terminally truncated LAMB1 variants were found trapped in the cytosol of patient fibroblasts, causing cerebral small vessel disease and leukoencephalopathy.","evidence":"ChIP of c-Jun on LAMB1 promoter with ERK inhibitor in gastric cancer cells; western blotting with N- and C-terminal antibodies in patient fibroblasts plus gene-based collapsing analysis of exome data","pmids":["33435161","34606115"],"confidence":"Medium","gaps":["Whether cytosol-trapped truncated LAMB1 exerts toxic gain-of-function versus simple loss-of-function not distinguished in patient cells","Relationship between ERK/c-Jun regulation and CNS-specific LAMB1 expression unexplored"]},{"year":2022,"claim":"Identification of DDX24–nucleolin as a complex that binds LAMB1 mRNA (nt 618–624) and stabilizes it revealed a dedicated post-transcriptional axis controlling LAMB1 abundance, operating downstream of RFX8 transcription.","evidence":"RNA immunoprecipitation, co-immunoprecipitation of DDX24-nucleolin, mRNA stability assays, and in vivo HCC tumor model","pmids":["35763670"],"confidence":"High","gaps":["Structural basis of DDX24 recognition of the 618–624 motif unknown","Whether DDX24-nucleolin regulation of LAMB1 operates outside hepatocellular carcinoma not tested"]},{"year":2023,"claim":"LAMB1 was shown to physically interact with FAK and transduce substrate stiffness into MEK1/2 signaling, establishing it as a direct mechanosensory input to focal adhesion signaling beyond a passive structural role.","evidence":"Co-immunoprecipitation of LAMB1-FAK, substrate stiffness modulation on polydimethylsiloxane, western blotting in odontoblast-like cells","pmids":["36519511"],"confidence":"Medium","gaps":["Binding interface between LAMB1 and FAK not mapped","Whether this mechanotransduction operates in other cell types not established"]},{"year":2025,"claim":"A series of studies in 2025 expanded LAMB1's functional repertoire: vascular LAMB1 acts as a haptotactic gradient for integrin α6-expressing microglial precursors via Rac1/F-actin; it activates Wnt/β-catenin to drive VEGFA in endothelial cells; it signals through NF-κB/HK2 to promote aerobic glycolysis in glioma; it modulates complement C3 antiviral responses; and Drosophila modeling confirmed blood-brain barrier function and suggested dominant gain-of-function for C-terminal truncation variants.","evidence":"Zebrafish/mouse endothelial-specific knockout with live imaging; siRNA knockdown in HUVECs with Wnt activator rescue; Seahorse metabolic assays with NF-κB inhibitor in glioma cells; ceRNA axis characterization in rotavirus-infected cells; Drosophila BBB-specific knockdown and HEK293T secretion assays","pmids":["41206867","40221061","39920513","40237496","40237576"],"confidence":"Medium","gaps":["Whether LAMB1 engages these diverse pathways simultaneously or in a context-dependent manner is unclear","Structural basis for how a single ECM molecule activates Wnt, NF-κB, and integrin–Rac1 pathways not resolved","In vivo validation of NF-κB/HK2 and Wnt/VEGFA axes beyond tumor xenograft or HUVEC systems is lacking"]},{"year":null,"claim":"Key unresolved questions include: (1) how LAMB1 assembles with α and γ chains and how disease-causing mutations perturb heterotrimer secretion at a structural level; (2) whether the diverse signaling outputs (Rac1, FAK-MEK, Wnt, NF-κB, complement C3) reflect distinct receptor-binding domains or shared integrin-mediated mechanisms; and (3) the genotype–phenotype relationship for dominant versus recessive LAMB1 alleles in human CNS disease.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of laminin β1 or its disease-relevant mutants","No systematic allelic series comparing gain- versus loss-of-function in a single model organism","Receptor specificity for individual LAMB1 signaling outputs not dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,9]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[9,15]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[9,8]}],"localization":[{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[0,9,3]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,10]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[0,9,3]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,9,11,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[13]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,4,10]}],"complexes":["laminin-111 (α1β1γ1 heterotrimer)"],"partners":["ITGA6","ITGB1","FAK","DDX24","NCL","RPSA","COL3A1"],"other_free_text":[]},"mechanistic_narrative":"LAMB1 encodes the β1 chain of laminin, a multidomain basement membrane glycoprotein that serves as a haptotactic ligand for integrin receptors and transduces extracellular matrix signals into diverse intracellular pathways including Rac1/F-actin polarization, FAK–MEK1/2, Wnt/β-catenin, and NF-κB/HK2 [PMID:41206867, PMID:36519511, PMID:40221061, PMID:39920513]. Vascular LAMB1 provides a guidance cue sensed by integrin α6 to direct microglial precursor migration into the retina, while in other contexts it promotes angiogenesis via VEGFA upregulation and modulates complement C3-dependent antiviral responses [PMID:41206867, PMID:40221061, PMID:40237496]. LAMB1 transcription is regulated by ERK/c-Jun and cAMP/PKA pathways, and its mRNA is stabilized by DDX24–nucleolin binding, whereas miR-124-5p and miR-365-1-5p suppress its expression post-transcriptionally [PMID:33435161, PMID:9419418, PMID:35763670, PMID:24497408]. Loss-of-function and dominant missense or C-terminal truncation mutations in LAMB1 cause leukoencephalopathy, cerebral small vessel disease, and dystonia-like movement disorders due to failed basement membrane secretion and disrupted CNS extracellular matrix integrity [PMID:26705335, PMID:34606115, PMID:40237576]."},"prefetch_data":{"uniprot":{"accession":"P07942","full_name":"Laminin subunit beta-1","aliases":["Laminin B1 chain","Laminin-1 subunit beta","Laminin-10 subunit beta","Laminin-12 subunit beta","Laminin-2 subunit beta","Laminin-6 subunit beta","Laminin-8 subunit beta"],"length_aa":1786,"mass_kda":198.0,"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. Involved in the organization of the laminar architecture of the cerebral cortex (PubMed:23472759). It is probably required for the integrity of the basement membrane/glia limitans that serves as an anchor point for the endfeet of radial glial cells and as a physical barrier to migrating neurons (By similarity). Radial glial cells play a central role in cerebral cortical development, where they act both as the proliferative unit of the cerebral cortex and a scaffold for neurons migrating toward the pial surface (By similarity). As a subunit of laminin-1 (also known as laminin-111 or EHS laminin), it is involved in the stimulation of agrin-induced receptor clustering through a MuSK-independent pathway (By similarity)","subcellular_location":"Secreted, extracellular space, extracellular matrix, basement membrane","url":"https://www.uniprot.org/uniprotkb/P07942/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LAMB1","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":[{"gene":"ALCAM","stoichiometry":0.2},{"gene":"CALD1","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"SSRP1","stoichiometry":0.2},{"gene":"XPO1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/LAMB1","total_profiled":1310},"omim":[{"mim_id":"621424","title":"LEUKOENCEPHALOPATHY WITHOUT LACUNAE, ADULT-ONSET; LUCAO","url":"https://www.omim.org/entry/621424"},{"mim_id":"615960","title":"PORETTI-BOLTSHAUSER SYNDROME; PTBHS","url":"https://www.omim.org/entry/615960"},{"mim_id":"615191","title":"LEUKOENCEPHALOPATHY WITH VARIABLE CORTICAL BRAIN MALFORMATIONS AND/OR HYDROCEPHALUS; LKBMH","url":"https://www.omim.org/entry/615191"},{"mim_id":"609915","title":"CARDIOMYOPATHY, DILATED, 1Q; CMD1Q","url":"https://www.omim.org/entry/609915"},{"mim_id":"607432","title":"LISSENCEPHALY 1; LIS1","url":"https://www.omim.org/entry/607432"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"placenta","ntpm":145.0}],"url":"https://www.proteinatlas.org/search/LAMB1"},"hgnc":{"alias_symbol":[],"prev_symbol":["CLM"]},"alphafold":{"accession":"P07942","domains":[{"cath_id":"2.60.120.260","chopping":"47-273","consensus_level":"high","plddt":85.8477,"start":47,"end":273},{"cath_id":"2.60.120.260","chopping":"556-636_650-709","consensus_level":"medium","plddt":85.7815,"start":556,"end":709},{"cath_id":"2.10.25.10","chopping":"982-1028","consensus_level":"medium","plddt":81.127,"start":982,"end":1028},{"cath_id":"-","chopping":"1254-1283_1655-1692","consensus_level":"medium","plddt":70.2281,"start":1254,"end":1692},{"cath_id":"1.20.5","chopping":"1751-1786","consensus_level":"medium","plddt":71.3672,"start":1751,"end":1786}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P07942","model_url":"https://alphafold.ebi.ac.uk/files/AF-P07942-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P07942-F1-predicted_aligned_error_v6.png","plddt_mean":76.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LAMB1","jax_strain_url":"https://www.jax.org/strain/search?query=LAMB1"},"sequence":{"accession":"P07942","fasta_url":"https://rest.uniprot.org/uniprotkb/P07942.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P07942/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P07942"}},"corpus_meta":[{"pmid":"3611077","id":"PMC_3611077","title":"Human laminin B1 chain. A multidomain protein with gene (LAMB1) locus in the q22 region of chromosome 7.","date":"1987","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/3611077","citation_count":174,"is_preprint":false},{"pmid":"18809619","id":"PMC_18809619","title":"Translational bypass of nonsense mutations in zebrafish rep1, pax2.1 and lamb1 highlights a viable therapeutic option for untreatable genetic eye disease.","date":"2008","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/18809619","citation_count":56,"is_preprint":false},{"pmid":"19561101","id":"PMC_19561101","title":"An activating and inhibitory signal from an inhibitory receptor LMIR3/CLM-1: LMIR3 augments lipopolysaccharide response through association with FcRgamma in mast cells.","date":"2009","source":"Journal of immunology (Baltimore, Md. : 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The LAMB1 gene was mapped to chromosome 7q22 by somatic cell hybrid methodology and in situ hybridization.\",\n      \"method\": \"cDNA cloning, sequence analysis, somatic cell hybrid mapping, in situ hybridization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — complete sequence determination with domain analysis, chromosomal mapping confirmed by two orthogonal methods\",\n      \"pmids\": [\"3611077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The cAMP/PKA signaling pathway regulates LAMB1 gene expression; a dominant-negative regulatory subunit of PKA reduced activation of the LAMB1 DNase I hypersensitivity site 2 enhancer (measured by CAT assay), and reduced protein binding at the C2 motif within this enhancer region after retinoic acid and cAMP treatment, indicating PKA is involved in inducing the C2-binding protein.\",\n      \"method\": \"Stable transfection of dominant-negative PKA regulatory subunit, CAT (chloramphenicol acetyltransferase) reporter assay, electrophoretic mobility shift assay (EMSA), in vitro phosphorylation\",\n      \"journal\": \"Cell growth & differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (CAT assay, EMSA, in vitro phosphorylation) in a single lab\",\n      \"pmids\": [\"9419418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Approximately 4 kb of LAMB1 5' flanking sequence drives tissue-specific expression in kidney, mammary gland, and genital systems; the first 0.7 kb is sufficient to direct expression specifically in prospermatogonia, while oocyte and mesonephric duct expression requires elements within 4 kb of the transcription start site.\",\n      \"method\": \"Transgenic mouse lines with LAMB1 promoter-lacZ fusions, beta-galactosidase reporter assay\",\n      \"journal\": \"Differentiation; research in biological diversity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional dissection of cis-regulatory elements using transgenic reporter mice\",\n      \"pmids\": [\"9447707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A dominant missense mutation in mouse Lamb1 (lamb1t) causes a dystonia-like movement disorder; electrophysiological recording showed abnormal output from cerebellar Purkinje cells and deep cerebellar nucleus neurons (both Lamb1-expressing) during abnormal postures, indicating that LAMB1 dysfunction in CNS extracellular matrix disrupts descending inhibitory circuits and exposes excess spinal cord activity.\",\n      \"method\": \"SNP mapping, exome sequencing, EMG (co-contraction analysis), in vivo cerebellar electrophysiology in awake mice\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic identification of causative mutation plus in vivo neurophysiology linking LAMB1 to specific circuit dysfunction, multiple orthogonal methods\",\n      \"pmids\": [\"26705335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LAMB1 C-terminally truncated variants that escape nonsense-mediated mRNA decay are expressed as truncated proteins trapped in the cytosol (rather than secreted to the extracellular matrix), as demonstrated by western blotting with N- and C-terminal antibodies in patient fibroblasts; these variants cause cerebral small vessel disease with hippocampal memory defects and leukoencephalopathy.\",\n      \"method\": \"Western blotting with N- and C-terminal antibodies, patient fibroblast analysis, gene-based collapsing test of exome data\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein localization in patient cells using two-antibody approach demonstrating cytosolic retention\",\n      \"pmids\": [\"34606115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ERK/c-Jun signaling axis drives LAMB1 transcription; c-Jun directly binds to the LAMB1 promoter as a transcription factor and the ERK inhibitor U0126 suppresses LAMB1 expression; elevated LAMB1 promotes gastric cancer cell proliferation, invasion, and migration.\",\n      \"method\": \"ERK inhibitor treatment, chromatin immunoprecipitation (ChIP) showing c-Jun binding to LAMB1 promoter, LAMB1 overexpression and knockdown with proliferation/invasion/migration assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating direct promoter binding, pharmacological inhibition, and functional rescue experiments\",\n      \"pmids\": [\"33435161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-124-5p directly suppresses LAMB1 protein expression post-transcriptionally; restoration of miR-124-5p in glioma cells reduced LAMB1 protein levels, suppressed tumor growth and angiogenesis—effects also produced by direct LAMB1 knockdown.\",\n      \"method\": \"miR-124-5p restoration, western blotting, qPCR, cell proliferation, colony formation, in vivo tumor growth and angiogenesis assays\",\n      \"journal\": \"Neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — miRNA restoration and direct LAMB1 knockdown producing parallel phenotypes, confirmed in vivo\",\n      \"pmids\": [\"24497408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DDX24 binds the mRNA of LAMB1 at nucleotides 618–624 and increases LAMB1 mRNA stability in a manner dependent on interaction between nucleolin and the C-terminal region of DDX24, thereby promoting HCC cell migration and proliferation; RFX8 transcriptionally upregulates DDX24 to drive this axis.\",\n      \"method\": \"RNA immunoprecipitation (DDX24-LAMB1 mRNA binding), co-immunoprecipitation (DDX24-nucleolin interaction), mRNA stability assay, overexpression/knockdown of DDX24 and LAMB1, in vivo tumor model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct RNA binding demonstrated, protein interaction mapped, mRNA stability quantified, in vivo validation; multiple orthogonal methods\",\n      \"pmids\": [\"35763670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LAMB1 physically interacts with FAK (focal adhesion kinase) at cell-substrate interfaces, and this binding transduces mechanical stiffness signals into MEK1/2 activation to drive dentinogenesis in odontoblast-like cells.\",\n      \"method\": \"Immunoprecipitation (LAMB1-FAK interaction), immunofluorescent staining, western blotting, substrate stiffness modulation using polydimethylsiloxane, qPCR\",\n      \"journal\": \"Oral diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein interaction confirmed by co-IP, functional mechanosignaling assay with defined pathway readout\",\n      \"pmids\": [\"36519511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Vascular LAMB1 provides a haptotactic gradient for retinal microglial precursors sensed by integrin alpha-6 (Itga6) on microglial precursors, which activates Rac1 signaling to promote F-actin polarization and directional migration into the retina; disruption of this Lamb1-Itga6 axis in zebrafish blocked vitreous entry and retinal colonization, and endothelial-specific LAMB1 deficiency in mice similarly impaired microglial precursor settlement.\",\n      \"method\": \"Zebrafish genetics (Lamb1 and Itga6 disruption), mouse endothelial-specific knockout, live imaging, F-actin polarization assays, Rac1 signaling assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conserved pathway validated in two species (zebrafish and mouse) with cell-type-specific knockout, multiple orthogonal readouts\",\n      \"pmids\": [\"41206867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Drosophila LanB1 (LAMB1 ortholog) localizes to the blood-brain barrier (BBB) in adult fly brains in a subset of glia cells; BBB-specific knockdown causes shortened lifespan and locomotor defects. In vitro assay in HEK293T cells showed that late-truncated LAMB1 is uniquely detected as a monomer in the culture medium, suggesting a dominant gain-of-function mechanism for C-terminal truncation variants causing dominant leukoencephalopathy, while frameshift variants behave as strong loss-of-function alleles.\",\n      \"method\": \"Drosophila genetics (tissue-specific knockdown), in vivo rescue experiments with analogous variants, HEK293T cell culture and western blotting of conditioned medium\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo fly genetics plus in vitro mechanistic assay; ortholog functional validation with human variant analysis\",\n      \"pmids\": [\"40237576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LAMB1 activates the NF-κB pathway to upregulate HK2 and promote aerobic glycolysis in glioma cells; pharmacological inhibition of NF-κB (Bay 11-7082) or LAMB1 knockdown suppressed glycolysis (reduced ECAR, glucose uptake, lactate production), cell proliferation, invasion, and enhanced temozolomide sensitivity in vitro and reduced tumor growth in vivo.\",\n      \"method\": \"LAMB1 overexpression/knockdown, Seahorse ECAR measurement, glucose/lactate assays, NF-κB inhibitor (Bay 11-7082), western blotting (HK1, HK2, PDHA, PKM), subcutaneous tumor model\",\n      \"journal\": \"Discover oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays with pathway inhibitor validation and in vivo confirmation\",\n      \"pmids\": [\"39920513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LAMB1 promotes fracture healing by activating the Wnt/β-catenin signaling pathway to upregulate VEGFA expression in endothelial cells, thereby promoting EC proliferation, migration, and tube formation; siRNA knockdown of LAMB1 suppressed wnt3a, GSK-3β, β-catenin, and VEGFA expression, and co-treatment with a Wnt activator (HY-141873) partially reversed these effects.\",\n      \"method\": \"scRNA-seq analysis, siRNA knockdown of LAMB1 in HUVECs, qRT-PCR, immunofluorescence, transwell assay, tube formation assay, western blotting\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with pathway rescue experiment using Wnt activator, multiple orthogonal assays\",\n      \"pmids\": [\"40221061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LAMB1 modulates complement C3-mediated antiviral activity; LAMB1 expression promotes C3 upregulation following rotavirus infection, and miR-365-1-5p downregulates LAMB1 to inhibit the C3 antiviral response; lncRNA DARVR acts as a competing endogenous RNA for miR-365-1-5p, restoring LAMB1 expression and enhancing C3-dependent inhibition of rotavirus replication.\",\n      \"method\": \"lncRNA-miRNA-mRNA axis characterization, miR-365-1-5p overexpression/inhibition, LAMB1 knockdown/overexpression, C3 expression assays, rotavirus replication assays in MA104 cells\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ceRNA mechanism validated with multiple functional assays showing LAMB1-dependent C3 regulation and antiviral effect\",\n      \"pmids\": [\"40237496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In a preprint/early online study of cortical brain development, LAMB1 protein and its receptors RPSA and ITGB1 were imbalanced when LIN28A and CTNNB1 were co-activated, correlating with a porous pial border and overmigration of neural cells, suggesting LAMB1's role in maintaining extracellular matrix integrity at the pial surface to prevent cobblestone lissencephaly-like cortical dysgenesis.\",\n      \"method\": \"Spatially resolved proteome analysis of mouse embryonic brains, histomorphological analysis\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — preprint, single proteomics approach, correlative rather than direct functional manipulation of LAMB1\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"LAMB1 silencing in a SCH rat model reduced ITGB1 and integrin-related signaling through the COL3A1/RAC1 axis; in vitro, LAMB1 knockdown in HTR-8/SVneo trophoblasts enhanced proliferation, migration, and invasion while reducing pro-inflammatory cytokines, indicating LAMB1 promotes inflammation and coagulation dysfunction via COL3A1/RAC1 regulation.\",\n      \"method\": \"LAMB1 knockdown in vivo (LPS-induced SCH rat model) and in vitro (trophoblast cells), proteomic and transcriptomic analysis, cytokine measurement\",\n      \"journal\": \"BMC biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — combined in vivo knockout and in vitro knockdown with pathway identification via proteomics and transcriptomics\",\n      \"pmids\": [\"41840580\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LAMB1 encodes the β1 chain of laminin, a multidomain extracellular matrix glycoprotein that assembles into the basement membrane where it serves as a haptotactic and structural cue: it physically interacts with integrins (Itga6, ITGB1) to activate downstream signaling (Rac1/F-actin, FAK-MEK1/2, RhoA), regulates complement C3 activity, drives Wnt/β-catenin and NF-κB/HK2 pathway activation, and is transcriptionally controlled by ERK/c-Jun and PKA; its mRNA stability is post-transcriptionally regulated by DDX24/nucleolin, and miR-124-5p suppresses its translation, with loss-of-function causing leukoencephalopathy, dystonia-like movement disorders, and developmental brain malformations due to failed basement membrane secretion.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"LAMB1 encodes the β1 chain of laminin, a multidomain basement membrane glycoprotein that serves as a haptotactic ligand for integrin receptors and transduces extracellular matrix signals into diverse intracellular pathways including Rac1/F-actin polarization, FAK–MEK1/2, Wnt/β-catenin, and NF-κB/HK2 [PMID:41206867, PMID:36519511, PMID:40221061, PMID:39920513]. Vascular LAMB1 provides a guidance cue sensed by integrin α6 to direct microglial precursor migration into the retina, while in other contexts it promotes angiogenesis via VEGFA upregulation and modulates complement C3-dependent antiviral responses [PMID:41206867, PMID:40221061, PMID:40237496]. LAMB1 transcription is regulated by ERK/c-Jun and cAMP/PKA pathways, and its mRNA is stabilized by DDX24–nucleolin binding, whereas miR-124-5p and miR-365-1-5p suppress its expression post-transcriptionally [PMID:33435161, PMID:9419418, PMID:35763670, PMID:24497408]. Loss-of-function and dominant missense or C-terminal truncation mutations in LAMB1 cause leukoencephalopathy, cerebral small vessel disease, and dystonia-like movement disorders due to failed basement membrane secretion and disrupted CNS extracellular matrix integrity [PMID:26705335, PMID:34606115, PMID:40237576].\",\n  \"teleology\": [\n    {\n      \"year\": 1987,\n      \"claim\": \"Determining the full primary structure and chromosomal location of LAMB1 established its multidomain architecture—cysteine-rich repeats, globular regions, and helical segments—providing the first molecular framework for understanding laminin β1 chain function.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, somatic cell hybrid mapping, and in situ hybridization localized the gene to chromosome 7q22\",\n      \"pmids\": [\"3611077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No three-dimensional structure of the full-length protein\", \"Functional significance of individual domain repeats not tested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of cAMP/PKA and cis-regulatory elements controlling LAMB1 transcription revealed that its expression is actively regulated rather than constitutive, with tissue-specific promoter elements directing expression in kidney, mammary gland, and germ cells.\",\n      \"evidence\": \"Dominant-negative PKA, CAT reporter assays, EMSA in cell lines; transgenic LAMB1 promoter-lacZ mice showing tissue-specific reporter expression\",\n      \"pmids\": [\"9419418\", \"9447707\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the C2 motif-binding transcription factor not determined\", \"Promoter elements for CNS expression not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrating that miR-124-5p directly suppresses LAMB1 protein and that LAMB1 knockdown phenocopies miR-124-5p restoration in glioma established LAMB1 as a post-transcriptionally regulated oncogenic effector in brain tumors.\",\n      \"evidence\": \"miR-124-5p restoration and direct LAMB1 knockdown in glioma cells with parallel reduction in proliferation, colony formation, and in vivo tumor growth\",\n      \"pmids\": [\"24497408\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct miRNA-target binding site validation (e.g., luciferase reporter with mutant 3′-UTR) not shown in this study\", \"Downstream signaling pathway mediating LAMB1-driven glioma growth not identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"A dominant missense Lamb1 mutation causing dystonia-like movement disorder in mice linked LAMB1 to CNS circuit function, showing that basement membrane disruption in the cerebellum leads to aberrant Purkinje cell and deep cerebellar nucleus output.\",\n      \"evidence\": \"SNP mapping, exome sequencing of mouse mutant; in vivo cerebellar electrophysiology and EMG co-contraction analysis in awake mice\",\n      \"pmids\": [\"26705335\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise mechanism by which the missense mutation disrupts laminin trimer assembly or ECM integration not resolved\", \"Whether the same circuit dysfunction occurs in human patients unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Two advances clarified LAMB1's transcriptional regulation and its role in human disease: ERK/c-Jun was shown to directly activate LAMB1 transcription via promoter binding, and C-terminally truncated LAMB1 variants were found trapped in the cytosol of patient fibroblasts, causing cerebral small vessel disease and leukoencephalopathy.\",\n      \"evidence\": \"ChIP of c-Jun on LAMB1 promoter with ERK inhibitor in gastric cancer cells; western blotting with N- and C-terminal antibodies in patient fibroblasts plus gene-based collapsing analysis of exome data\",\n      \"pmids\": [\"33435161\", \"34606115\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether cytosol-trapped truncated LAMB1 exerts toxic gain-of-function versus simple loss-of-function not distinguished in patient cells\", \"Relationship between ERK/c-Jun regulation and CNS-specific LAMB1 expression unexplored\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of DDX24–nucleolin as a complex that binds LAMB1 mRNA (nt 618–624) and stabilizes it revealed a dedicated post-transcriptional axis controlling LAMB1 abundance, operating downstream of RFX8 transcription.\",\n      \"evidence\": \"RNA immunoprecipitation, co-immunoprecipitation of DDX24-nucleolin, mRNA stability assays, and in vivo HCC tumor model\",\n      \"pmids\": [\"35763670\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DDX24 recognition of the 618–624 motif unknown\", \"Whether DDX24-nucleolin regulation of LAMB1 operates outside hepatocellular carcinoma not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"LAMB1 was shown to physically interact with FAK and transduce substrate stiffness into MEK1/2 signaling, establishing it as a direct mechanosensory input to focal adhesion signaling beyond a passive structural role.\",\n      \"evidence\": \"Co-immunoprecipitation of LAMB1-FAK, substrate stiffness modulation on polydimethylsiloxane, western blotting in odontoblast-like cells\",\n      \"pmids\": [\"36519511\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding interface between LAMB1 and FAK not mapped\", \"Whether this mechanotransduction operates in other cell types not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A series of studies in 2025 expanded LAMB1's functional repertoire: vascular LAMB1 acts as a haptotactic gradient for integrin α6-expressing microglial precursors via Rac1/F-actin; it activates Wnt/β-catenin to drive VEGFA in endothelial cells; it signals through NF-κB/HK2 to promote aerobic glycolysis in glioma; it modulates complement C3 antiviral responses; and Drosophila modeling confirmed blood-brain barrier function and suggested dominant gain-of-function for C-terminal truncation variants.\",\n      \"evidence\": \"Zebrafish/mouse endothelial-specific knockout with live imaging; siRNA knockdown in HUVECs with Wnt activator rescue; Seahorse metabolic assays with NF-κB inhibitor in glioma cells; ceRNA axis characterization in rotavirus-infected cells; Drosophila BBB-specific knockdown and HEK293T secretion assays\",\n      \"pmids\": [\"41206867\", \"40221061\", \"39920513\", \"40237496\", \"40237576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether LAMB1 engages these diverse pathways simultaneously or in a context-dependent manner is unclear\", \"Structural basis for how a single ECM molecule activates Wnt, NF-κB, and integrin–Rac1 pathways not resolved\", \"In vivo validation of NF-κB/HK2 and Wnt/VEGFA axes beyond tumor xenograft or HUVEC systems is lacking\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: (1) how LAMB1 assembles with α and γ chains and how disease-causing mutations perturb heterotrimer secretion at a structural level; (2) whether the diverse signaling outputs (Rac1, FAK-MEK, Wnt, NF-κB, complement C3) reflect distinct receptor-binding domains or shared integrin-mediated mechanisms; and (3) the genotype–phenotype relationship for dominant versus recessive LAMB1 alleles in human CNS disease.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of laminin β1 or its disease-relevant mutants\", \"No systematic allelic series comparing gain- versus loss-of-function in a single model organism\", \"Receptor specificity for individual LAMB1 signaling outputs not dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [9, 15]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [9, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [0, 9, 3]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0, 9, 3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 9, 11, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 4, 10]}\n    ],\n    \"complexes\": [\n      \"laminin-111 (α1β1γ1 heterotrimer)\"\n    ],\n    \"partners\": [\n      \"ITGA6\",\n      \"ITGB1\",\n      \"FAK\",\n      \"DDX24\",\n      \"NCL\",\n      \"RPSA\",\n      \"COL3A1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}