LAMB2
Identifiers
Aliases	LAMB2, LAMS, NPHS5, Laminin, beta 2, laminin subunit beta 2, PIERS
External IDs	OMIM: 150325 MGI: 99916 HomoloGene: 1723 GeneCards: LAMB2
Gene location (Human) Chr. Chromosome 3 (human)[1] Band 3p21.31 Start 49,121,114 bp[1] End 49,133,118 bp[1]
Gene location (Mouse) Chr. Chromosome 9 (mouse)[2] Band 9 F2|9 59.4 cM Start 108,356,935 bp[2] End 108,367,729 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in right lobe of thyroid gland stromal cell of endometrium left lobe of thyroid gland ascending aorta canal of the cervix right coronary artery left uterine tube gastric mucosa tibial nerve left coronary artery Top expressed in external carotid artery internal carotid artery ascending aorta ankle joint myocardium of ventricle lip ankle cardiac muscles uterus skeletal muscle tissue More reference expression data BioGPS More reference expression data
Gene ontology Molecular function structural molecule activity integrin binding extracellular matrix structural constituent Cellular component extracellular matrix synapse extracellular region basement membrane laminin-3 complex laminin-11 complex extracellular exosome laminin complex extracellular space synaptic cleft endoplasmic reticulum lumen neuromuscular junction collagen-containing extracellular matrix Biological process metanephric glomerular visceral epithelial cell development astrocyte development Schwann cell development synapse organization axon extension involved in regeneration extracellular matrix organization axon guidance cell adhesion neuromuscular junction development retina development in camera-type eye metanephric glomerular basement membrane development cell morphogenesis involved in differentiation neuron projection development visual perception post-translational protein modification animal organ morphogenesis tissue development cell migration substrate adhesion-dependent cell spreading basement membrane assembly Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 3913 16779 Ensembl ENSG00000172037 ENSMUSG00000052911 UniProt P55268 Q61292 RefSeq (mRNA) NM_002292 NM_008483 RefSeq (protein) NP_002283 NP_032509 Location (UCSC) Chr 3: 49.12 – 49.13 Mb Chr 9: 108.36 – 108.37 Mb PubMed search [3] [4]
Wikidata
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Laminin subunit beta-2 is a protein that in humans is encoded by the LAMB2 gene.^[5][6][7]

Function

Laminins, a family of extracellular matrix glycoproteins, are the major noncollagenous constituent of basement membranes. They have been implicated in a wide variety of biological processes including cell adhesion, differentiation, migration, signaling, neurite outgrowth and metastasis. Laminins are composed of 3 non identical chains: laminin alpha, beta and gamma (formerly A, B1, and B2, respectively) and they form a cruciform structure consisting of 3 short arms, each formed by a different chain, and a long arm composed of all 3 chains. Each laminin chain is a multidomain protein encoded by a distinct gene. Several isoforms of each chain have been described. Different alpha, beta and gamma chain isomers combine to give rise to different heterotrimeric laminin isoforms, which were formerly designated by Arabic numerals in the order of their discovery, e.g. alpha1beta1gamma1 heterotrimer was known as laminin 1, but the nomenclature now calls for using the numbers of each individual laminin subunit isoform, e.g. what was formerly Laminin 1 is now Laminin 111, and what was formerly Laminin 5 is now Laminin 332.^[8] The biological functions of the different chains and trimer molecules are largely unknown, but some of the chains have been shown to differ with respect to their tissue distribution, presumably reflecting diverse functions in vivo. This gene encodes the beta chain isoform laminin, beta 2. The beta 2 chain contains the 7 structural domains typical of beta chains of laminin, including the short alpha region. However, unlike beta 1 chain, beta 2 has a more restricted tissue distribution. It is enriched in the basement membrane of muscles at the neuromuscular junctions, kidney glomerulus and vascular smooth muscle. Transgenic mice in which the beta 2 chain gene was inactivated by homologous recombination, showed defects in the maturation of neuromuscular junctions and impairment of glomerular filtration. Alternative splicing involving a non consensus 5' splice site (gc) in the 5' UTR of this gene has been reported. It was suggested that inefficient splicing of this first intron, which does not change the protein sequence, results in a greater abundance of the un^[7]