6-129149007-CAT-C
Variant summary
Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong
The NM_000426.4(LAMA2):c.939_940del(p.Cys314TrpfsTer3) variant causes a frameshift change. The variant allele was found at a frequency of 0.00000548 in 1,461,136 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 0.0000055 ( 0 hom. )
Consequence
LAMA2
NM_000426.4 frameshift
NM_000426.4 frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 5.85
Genes affected
LAMA2 (HGNC:6482): (laminin subunit alpha 2) Laminin, an extracellular protein, is a major component of the basement membrane. It is thought to mediate the attachment, migration, and organization of cells into tissues during embryonic development by interacting with other extracellular matrix components. It is composed of three subunits, alpha, beta, and gamma, which are bound to each other by disulfide bonds into a cross-shaped molecule. This gene encodes the alpha 2 chain, which constitutes one of the subunits of laminin 2 (merosin) and laminin 4 (s-merosin). Mutations in this gene have been identified as the cause of congenital merosin-deficient muscular dystrophy. Two transcript variants encoding different proteins have been found for this gene. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 16 ACMG points.
PVS1
?
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PP5
?
Variant 6-129149007-CAT-C is Pathogenic according to our data. Variant chr6-129149007-CAT-C is described in ClinVar as [Pathogenic]. Clinvar id is 477529.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr6-129149007-CAT-C is described in Lovd as [Likely_pathogenic]. Variant chr6-129149007-CAT-C is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
LAMA2 | NM_000426.4 | c.939_940del | p.Cys314TrpfsTer3 | frameshift_variant | 7/65 | ENST00000421865.3 | |
LAMA2 | NM_001079823.2 | c.939_940del | p.Cys314TrpfsTer3 | frameshift_variant | 7/64 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
LAMA2 | ENST00000421865.3 | c.939_940del | p.Cys314TrpfsTer3 | frameshift_variant | 7/65 | 5 | NM_000426.4 |
Frequencies
GnomAD3 genomes ? Cov.: 32
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GnomAD3 exomes AF: 0.0000279 AC: 7AN: 251318Hom.: 0 AF XY: 0.0000221 AC XY: 3AN XY: 135816
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GnomAD4 exome AF: 0.00000548 AC: 8AN: 1461136Hom.: 0 AF XY: 0.00000550 AC XY: 4AN XY: 726926
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ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:6
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Merosin deficient congenital muscular dystrophy Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Baylor Genetics | Aug 19, 2023 | - - |
Likely pathogenic, no assertion criteria provided | clinical testing | Counsyl | Mar 22, 2017 | - - |
LAMA2-related muscular dystrophy Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Jan 15, 2024 | Variant summary: LAMA2 c.939_940delAT (p.Cys314TrpfsX3) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant allele was found at a frequency of 2.8e-05 in 251318 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.939_940delAT has been reported in the literature in multiple homozygous and compound heterozygous individuals affected with Laminin Alpha 2-Related Dystrophy (e.g., Oliveira_2018). These data indicate that the variant is very likely to be associated with disease. The following publication have been ascertained in the context of this evaluation (PMID: 30055037). ClinVar contains an entry for this variant (Variation ID: 477529). Based on the evidence outlined above, the variant was classified as pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jan 11, 2024 | This sequence change creates a premature translational stop signal (p.Cys314Trpfs*3) in the LAMA2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in LAMA2 are known to be pathogenic (PMID: 18700894, 32904964). This variant is present in population databases (no rsID available, gnomAD 0.02%). This premature translational stop signal has been observed in individuals with congenital muscular dystrophy (PMID: 30055037). ClinVar contains an entry for this variant (Variation ID: 477529). For these reasons, this variant has been classified as Pathogenic. - |
Inborn genetic diseases Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Sep 22, 2017 | - - |
not provided Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Feb 24, 2021 | - - |
Computational scores
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Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at