6-7583893-C-T

Variant names:

• chr6-7583893-C-T
• NM_004415.4:c.6631C>T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_004415.4(DSP):​c.6631C>T​(p.Gln2211*) variant causes a stop gained change. 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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: DSP NM_004415.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.04

Genes affected

DSP (HGNC:3052): (desmoplakin) This gene encodes a protein that anchors intermediate filaments to desmosomal plaques and forms an obligate component of functional desmosomes. Mutations in this gene are the cause of several cardiomyopathies and keratodermas, including skin fragility-woolly hair syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 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 12 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 6-7583893-C-T is Pathogenic according to our data. Variant chr6-7583893-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 1754576.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DSP	NM_004415.4	c.6631C>T	p.Gln2211*	stop_gained	Exon 24 of 24	ENST00000379802.8	NP_004406.2
DSP	NM_001319034.2	c.5302C>T	p.Gln1768*	stop_gained	Exon 24 of 24		NP_001305963.1
DSP	NM_001008844.3	c.4834C>T	p.Gln1612*	stop_gained	Exon 24 of 24		NP_001008844.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DSP	ENST00000379802.8	c.6631C>T	p.Gln2211*	stop_gained	Exon 24 of 24	1	NM_004415.4	ENSP00000369129.3
DSP	ENST00000418664.2	c.4834C>T	p.Gln1612*	stop_gained	Exon 24 of 24	1		ENSP00000396591.2
DSP	ENST00000710359.1	c.5302C>T	p.Gln1768*	stop_gained	Exon 24 of 24			ENSP00000518230.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cardiovascular phenotype Pathogenic:1

May 09, 2021

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Q2211* pathogenic mutation (also known as c.6631C>T), located in coding exon 24 of the DSP gene, results from a C to T substitution at nucleotide position 6631. This changes the amino acid from a glutamine to a stop codon within coding exon 24. This alteration occurs at the 3' terminus of theDSP gene, is not expected to trigger nonsense-mediated mRNA decay, and impacts the last 23% (661 amino acids) of the protein. However, premature stop codons are typically deleterious in nature, and the impacted region is critical for protein (Ambry internal data). Alterations in DSP that result in haploinsufficiency or protein truncation have been reported in patients with arrhythmogenic right ventricular cardiomyopathy (ARVC) and dilated cardiomyopathy (DCM) (Fressart V et al. Europace. 2010;12(6):861-8; Elliott P et al. Circ Cardiovasc Genet. 2010;3(4):314-22; Quarta G et al. Circulation. 2011;123(23):2701-9; Garcia-Pavia P et al. Heart. 2011;97(21):1744-52; Rasmussen TB et al. Clin Genet. 2013;84(1):20-30; Pugh TJ et al. Genet Med. 2014;16(8):601-8). Based on the supporting evidence, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.53	D
BayesDel_noAF	Pathogenic	0.52
CADD	Pathogenic	39
DANN	Uncertain	1.0
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Uncertain	0.89	D
Vest4		0.95
GERP RS		5.6

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-7584126;