rs879255267
Positions:
Variant summary
Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2PP3_StrongPP5
The NM_002291.3(LAMB1):c.1442G>T(p.Cys481Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. C481C) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 32)
Consequence
LAMB1
NM_002291.3 missense
NM_002291.3 missense
Scores
13
3
1
Clinical Significance
Conservation
PhyloP100: 7.57
Genes affected
LAMB1 (HGNC:6486): (laminin subunit beta 1) 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]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 7 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.991
PP5
?
Variant 7-107975026-C-A is Pathogenic according to our data. Variant chr7-107975026-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 225688.Status of the report is no_assertion_criteria_provided, 0 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
LAMB1 | NM_002291.3 | c.1442G>T | p.Cys481Phe | missense_variant | 12/34 | ENST00000222399.11 | |
LAMB1 | XM_047420359.1 | c.1442G>T | p.Cys481Phe | missense_variant | 12/28 | ||
LAMB1 | XM_047420360.1 | c.1442G>T | p.Cys481Phe | missense_variant | 12/25 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
LAMB1 | ENST00000222399.11 | c.1442G>T | p.Cys481Phe | missense_variant | 12/34 | 1 | NM_002291.3 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 29
GnomAD4 exome
Cov.:
29
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:1
Revision: no assertion criteria provided
LINK: link
Submissions by phenotype
Cobblestone lissencephaly without muscular or ocular involvement Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | OMIM | Oct 14, 2021 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Uncertain
D
LIST_S2
Pathogenic
D;D;D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D;D;D
MetaSVM
Pathogenic
D
MutationTaster
Benign
D;D;D
PrimateAI
Uncertain
T
PROVEAN
Pathogenic
D;D;D
REVEL
Pathogenic
Sift
Pathogenic
D;D;D
Sift4G
Pathogenic
D;D;D
Polyphen
D;D;D
Vest4
MutPred
Gain of catalytic residue at C505 (P = 0.0229);.;.;
MVP
MPC
0.59
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at