rs1553275034

chr1-209615336-TCTCCAGTC-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_Moderate PM2 PP5_Moderate

The NM_000228.3(LAMB3):c.3446_3453del(p.Gly1149GlufsTer8) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: LAMB3 NM_000228.3 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 4.50

Genes affected

LAMB3 (HGNC:6490): (laminin subunit beta 3) The product encoded by this gene is a laminin that belongs to a family of basement membrane proteins. This protein is a beta subunit laminin, which together with an alpha and a gamma subunit, forms laminin-5. Mutations in this gene cause epidermolysis bullosa junctional Herlitz type, and generalized atrophic benign epidermolysis bullosa, diseases that are characterized by blistering of the skin. Multiple alternatively spliced transcript variants that encode the same protein have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 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. Fraction of 0.0207 CDS is truncated, and there are 1 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-209615336-TCTCCAGTC-T is Pathogenic according to our data. Variant chr1-209615336-TCTCCAGTC-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 180675.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LAMB3	NM_000228.3	c.3446_3453del	p.Gly1149GlufsTer8	frameshift_variant	23/23	ENST00000356082.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LAMB3	ENST00000356082.9	c.3446_3453del	p.Gly1149GlufsTer8	frameshift_variant	23/23	1	NM_000228.3	P1
LAMB3	ENST00000367030.7	c.3446_3453del	p.Gly1149GlufsTer8	frameshift_variant	23/23	1		P1
LAMB3	ENST00000391911.5	c.3446_3453del	p.Gly1149GlufsTer8	frameshift_variant	22/22	1		P1

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Amelogenesis imperfecta type 1A Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Oct 01, 2013

- -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Jun 20, 2022

Frameshift variant predicted to result in protein truncation, as the last 24 amino acids are replaced with 7 different amino acids, and other loss-of-function variants have been reported downstream in HGMD; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 23958762) -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1553275034; hg19: chr1-209788681;