rs1553267885
Variant names:
Variant summary
Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PVS1_StrongPM2PP5
The NM_005562.3(LAMC2):c.3411delA(p.Gln1137HisfsTer5) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,886 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. Q1137Q) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 0.0000014 ( 0 hom. )
Consequence
LAMC2
NM_005562.3 frameshift
NM_005562.3 frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 1.85
Publications
0 publications found
Genes affected
LAMC2 (HGNC:6493): (laminin subunit gamma 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), have 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 gamma chain isoform laminin, gamma 2. The gamma 2 chain, formerly thought to be a truncated version of beta chain (B2t), is highly homologous to the gamma 1 chain; however, it lacks domain VI, and domains V, IV and III are shorter. It is expressed in several fetal tissues but differently from gamma 1, and is specifically localized to epithelial cells in skin, lung and kidney. The gamma 2 chain together with alpha 3 and beta 3 chains constitute laminin 5 (earlier known as kalinin), which is an integral part of the anchoring filaments that connect epithelial cells to the underlying basement membrane. The epithelium-specific expression of the gamma 2 chain implied its role as an epithelium attachment molecule, and mutations in this gene have been associated with junctional epidermolysis bullosa, a skin disease characterized by blisters due to disruption of the epidermal-dermal junction. Two transcript variants resulting from alternative splicing of the 3' terminal exon, and encoding different isoforms of gamma 2 chain, have been described. The two variants are differentially expressed in embryonic tissues, however, the biological significance of the two forms is not known. Transcript variants utilizing alternative polyA_signal have also been noted in literature. [provided by RefSeq, Aug 2011]
LAMC2 Gene-Disease associations (from GenCC):
- junctional epidermolysis bullosaInheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health
- junctional epidermolysis bullosa Herlitz typeInheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp, PanelApp Australia
- junctional epidermolysis bullosa, non-Herlitz typeInheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp, PanelApp Australia
- generalized junctional epidermolysis bullosa non-Herlitz typeInheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
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ACMG classification
Classification was made for transcript
Our verdict: Likely_pathogenic. The variant received 7 ACMG points.
PVS1
Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 4 pathogenic variants in the truncated region.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 1-183243227-CA-C is Pathogenic according to our data. Variant chr1-183243227-CA-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 552649.Status of the report is no_assertion_criteria_provided, 0 stars.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
|---|---|---|---|---|---|---|---|---|
| LAMC2 | NM_005562.3 | c.3411delA | p.Gln1137HisfsTer5 | frameshift_variant | Exon 23 of 23 | ENST00000264144.5 | NP_005553.2 | |
| LAMC2 | XM_047420358.1 | c.3328+2838delA | intron_variant | Intron 22 of 23 | XP_047276314.1 | |||
| LAMC2 | XM_047420361.1 | c.3328+2838delA | intron_variant | Intron 22 of 22 | XP_047276317.1 |
Ensembl
Frequencies
GnomAD3 genomes
GnomAD3 genomes
Cov.:
32
GnomAD4 exome AF: 0.00000137 AC: 2AN: 1461886Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2AN XY: 727246 show subpopulations
GnomAD4 exome
AF:
AC:
2
AN:
1461886
Hom.:
Cov.:
31
AF XY:
AC XY:
2
AN XY:
727246
show subpopulations
African (AFR)
AF:
AC:
0
AN:
33480
American (AMR)
AF:
AC:
0
AN:
44722
Ashkenazi Jewish (ASJ)
AF:
AC:
0
AN:
26136
East Asian (EAS)
AF:
AC:
0
AN:
39700
South Asian (SAS)
AF:
AC:
0
AN:
86258
European-Finnish (FIN)
AF:
AC:
1
AN:
53420
Middle Eastern (MID)
AF:
AC:
0
AN:
5768
European-Non Finnish (NFE)
AF:
AC:
0
AN:
1112006
Other (OTH)
AF:
AC:
1
AN:
60396
Allele Balance Distribution
Red line indicates average allele balance
Average allele balance: 0.450
Heterozygous variant carriers
0
0
1
1
2
2
0.00
0.20
0.40
0.60
0.80
0.95
Allele balance
GnomAD4 genome
GnomAD4 genome
Cov.:
32
ClinVar
Significance: Likely pathogenic
Submissions summary: Pathogenic:1
Revision: no assertion criteria provided
LINK: link
Submissions by phenotype
Junctional epidermolysis bullosa gravis of Herlitz Pathogenic:1
Jun 27, 2017
Counsyl
Significance:Likely pathogenic
Review Status:no assertion criteria provided
Collection Method:clinical testing
This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
PhyloP100
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
Publications
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