rs1554106853

Positions:

• chr6-7568552-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The ENST00000379802.8(DSP):​c.1382T>C​(p.Ile461Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,742 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. I461I) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DSP ENST00000379802.8 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 8.02

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 Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.823

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DSP	NM_004415.4	c.1382T>C	p.Ile461Thr	missense_variant	11/24	ENST00000379802.8	NP_004406.2
DSP	NM_001319034.2	c.1382T>C	p.Ile461Thr	missense_variant	11/24		NP_001305963.1
DSP	NM_001008844.3	c.1382T>C	p.Ile461Thr	missense_variant	11/24		NP_001008844.1
DSP	NM_001406591.1	c.1382T>C	p.Ile461Thr	missense_variant	11/11		NP_001393520.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DSP	ENST00000379802.8	c.1382T>C	p.Ile461Thr	missense_variant	11/24	1	NM_004415.4	ENSP00000369129	P2
DSP	ENST00000418664.2	c.1382T>C	p.Ile461Thr	missense_variant	11/24	1		ENSP00000396591	A2
DSP	ENST00000710359.1	c.1382T>C	p.Ile461Thr	missense_variant	11/24			ENSP00000518230	A2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461742 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727172

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 8;C1854063:Arrhythmogenic cardiomyopathy with wooly hair and keratoderma Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 01, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with DSP-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces isoleucine with threonine at codon 461 of the DSP protein (p.Ile461Thr). The isoleucine residue is highly conserved and there is a moderate physicochemical difference between isoleucine and threonine. -

Arrhythmogenic right ventricular dysplasia 8 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Mar 20, 2019

The DSP c.1382T>C (p.Ile461Thr) missense variant is located in the SH3 desmosome binding domain. A literature search was performed for the gene, cDNA, and amino acid change. No publications were found based on this search. This variant is not found in the Genome Aggregation Database in a region of good sequencing coverage, so the variant is presumed to be rare. Based on the limited evidence, the p.Ile461Thr variant is classified as a variant of uncertain significance for arrhythmogenic right ventricular cardiomyopathy. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.76
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.73	D;.
Eigen	Uncertain	0.67
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.87	D;D
M_CAP	Benign	0.083	D
MetaRNN	Pathogenic	0.82	D;D
MetaSVM	Uncertain	-0.10	T
MutationAssessor	Benign	1.8	L;L
MutationTaster	Benign	0.99	D;D
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-3.3	D;N
REVEL	Uncertain	0.59
Sift	Uncertain	0.0010	D;D
Sift4G	Uncertain	0.0070	D;D
Polyphen		0.99	D;.
Vest4		0.88
MutPred		0.30		Gain of phosphorylation at I461 (P = 0.0377);Gain of phosphorylation at I461 (P = 0.0377);
MVP		0.89
MPC		0.93
ClinPred		0.98	D
GERP RS		5.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.54
gMVP		0.74

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

LitVar

Other links and lift over

dbSNP: rs1554106853; hg19: chr6-7568785;