|Institutional Source||Beutler Lab|
|Gene Name||laminin B1|
|Synonyms||C80098, C81607, Lamb1-1, Lamb-1, D130003D08Rik|
|Is this an essential gene?||Essential (E-score: 1.000)|
|Stock #||R6505 (G1)|
|Chromosomal Location||31265234-31329644 bp(+) (GRCm38)|
|Type of Mutation||missense|
|DNA Base Change (assembly)||A to T at 31323462 bp|
|Amino Acid Change||Threonine to Serine at position 1397 (T1397S)|
|Ref Sequence||ENSEMBL: ENSMUSP00000132778 (fasta)|
|Gene Model||predicted gene model for transcript(s): [ENSMUST00000002979] [ENSMUST00000169088]|
|PDB Structure||Laminin beta1 LN-LE1-4 structure [X-RAY DIFFRACTION]|
|Predicted Effect||probably benign
AA Change: T1445S
PolyPhen 2 Score 0.210 (Sensitivity: 0.92; Specificity: 0.88)
AA Change: T1445S
|Predicted Effect||possibly damaging
AA Change: T1397S
PolyPhen 2 Score 0.635 (Sensitivity: 0.87; Specificity: 0.91)
AA Change: T1397S
|Predicted Effect||noncoding transcript
|Coding Region Coverage||
|Validation Efficiency||100% (84/84)|
FUNCTION: [Summary is not available for the mouse gene. This summary is for the human ortholog.] 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 are designated by Arabic numerals in the order of their discovery, i.e. alpha1beta1gamma1 heterotrimer is laminin 1. 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 1. The beta 1 chain has 7 structurally distinct domains which it shares with other beta chain isomers. The C-terminal helical region containing domains I and II are separated by domain alpha, domains III and V contain several EGF-like repeats, and domains IV and VI have a globular conformation. Laminin, beta 1 is expressed in most tissues that produce basement membranes, and is one of the 3 chains constituting laminin 1, the first laminin isolated from Engelbreth-Holm-Swarm (EHS) tumor. A sequence in the beta 1 chain that is involved in cell attachment, chemotaxis, and binding to the laminin receptor was identified and shown to have the capacity to inhibit metastasis. [provided by RefSeq, Aug 2011]
PHENOTYPE: Embryos homozygous for a gene trapped allele lack basement membranes and fail to survive past E5.5. Mice heterozygous for a spontaneous mutation exhibit dystonis with impaired neuron firing. [provided by MGI curators]
|Allele List at MGI|
|Other mutations in this stock||
|Other mutations in Lamb1||
(F):5'- CGCTGAATTGGCAGAACTTG -3'
(R):5'- TGGAGAGCTGTTCGACTTCAG -3'
(F):5'- CAGAACTTGAGAAAGATCTGAGTTTG -3'
(R):5'- TGTTCGACTTCAGCCAGGG -3'