rs786205562
Positions:
Variant summary
Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1PM2PP5_Moderate
The NM_002292.4(LAMB2):c.5056G>T(p.Glu1686Ter) variant causes a stop gained change involving the alteration of a non-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 Likely pathogenic (★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 33)
Consequence
LAMB2
NM_002292.4 stop_gained
NM_002292.4 stop_gained
Scores
4
2
1
Clinical Significance
Conservation
PhyloP100: 3.12
Genes affected
LAMB2 (HGNC:6487): (laminin subunit beta 2) 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, composed of 3 non identical chains: laminin alpha, beta and gamma (formerly A, B1, and B2, respectively), 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 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 unspliced form of the transcript than the spliced form. The full-length nature of the spliced transcript is not known. [provided by RefSeq, Aug 2011]
Genome browser will be placed here
ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 12 ACMG points.
PVS1
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 3-49121728-C-A is Pathogenic according to our data. Variant chr3-49121728-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 191176.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr3-49121728-C-A is described in Lovd as [Likely_pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
LAMB2 | NM_002292.4 | c.5056G>T | p.Glu1686Ter | stop_gained | 30/32 | ENST00000305544.9 | NP_002283.3 | |
LAMB2 | XM_005265127.5 | c.5056G>T | p.Glu1686Ter | stop_gained | 31/33 | XP_005265184.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
LAMB2 | ENST00000305544.9 | c.5056G>T | p.Glu1686Ter | stop_gained | 30/32 | 1 | NM_002292.4 | ENSP00000307156 | P1 | |
LAMB2 | ENST00000418109.5 | c.5056G>T | p.Glu1686Ter | stop_gained | 31/33 | 1 | ENSP00000388325 | P1 | ||
LAMB2 | ENST00000467506.5 | n.166G>T | non_coding_transcript_exon_variant | 2/3 | 2 | |||||
LAMB2 | ENST00000498377.1 | n.711G>T | non_coding_transcript_exon_variant | 3/5 | 2 |
Frequencies
GnomAD3 genomes Cov.: 33
GnomAD3 genomes
Cov.:
33
GnomAD4 exome Cov.: 33
GnomAD4 exome
Cov.:
33
GnomAD4 genome Cov.: 33
GnomAD4 genome
Cov.:
33
ClinVar
Significance: Likely pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
not provided Pathogenic:1
Likely pathogenic, criteria provided, single submitter | research | Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center | - | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
Eigen
Pathogenic
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
MutationTaster
Benign
A;A
Vest4
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
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