chr18-31069115-C-T

Position:

chr18-31069115-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_024422.6(DSC2):c.2287G>A(p.Ala763Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000167 in 1,613,956 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000016 ( 0 hom. )

Consequence

DSC2
NM_024422.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: -0.761

Variant links:

Genes affected

DSC2 (HGNC:3036): (desmocollin 2) This gene encodes a member of the desmocollin protein subfamily. Desmocollins, along with desmogleins, are cadherin-like transmembrane glycoproteins that are major components of the desmosome. Desmosomes are cell-cell junctions that help resist shearing forces and are found in high concentrations in cells subject to mechanical stress. This gene is found in a cluster with other desmocollin family members on chromosome 18. Mutations in this gene are associated with arrhythmogenic right ventricular dysplasia-11, and reduced protein expression has been described in several types of cancer. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2015]

DSC2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.048809975).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DSC2	NM_024422.6 linkuse as main transcript	c.2287G>A	p.Ala763Thr	missense_variant	15/16	ENST00000280904.11	NP_077740.1	Q02487-1
DSC2	NM_004949.5 linkuse as main transcript	c.2287G>A	p.Ala763Thr	missense_variant	15/17		NP_004940.1	Q02487-2
DSC2	NM_001406506.1 linkuse as main transcript	c.1858G>A	p.Ala620Thr	missense_variant	15/16		NP_001393435.1
DSC2	NM_001406507.1 linkuse as main transcript	c.1858G>A	p.Ala620Thr	missense_variant	15/17		NP_001393436.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
DSC2	ENST00000280904.11 linkuse as main transcript	c.2287G>A	p.Ala763Thr	missense_variant	15/16	1	NM_024422.6	ENSP00000280904.6	Q02487-1
DSC2	ENST00000251081.8 linkuse as main transcript	c.2287G>A	p.Ala763Thr	missense_variant	15/17	1		ENSP00000251081.6	Q02487-2
DSC2	ENST00000648081.1 linkuse as main transcript	c.1858G>A	p.Ala620Thr	missense_variant	16/17			ENSP00000497441.1	A0A3B3ISU0
DSC2	ENST00000682357.1 linkuse as main transcript	c.1858G>A	p.Ala620Thr	missense_variant	15/16			ENSP00000507826.1	A0A3B3ISU0

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152132

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000319

AC:

AN:

251026

Hom.:

AF XY:

0.0000295

AC XY:

AN XY:

135652

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000326

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000164

AC:

AN:

1461824

Hom.:

Cov.:

AF XY:

0.0000165

AC XY:

AN XY:

727210

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000101

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000144

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152132

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74296

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.0000329

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 11

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Aug 16, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 20, 2023	This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 763 of the DSC2 protein (p.Ala763Thr). This variant is present in population databases (rs777004957, gnomAD 0.04%). This missense change has been observed in individual(s) with hypertrophic cardiomyopathy (PMID: 23396983). ClinVar contains an entry for this variant (Variation ID: 373271). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt DSC2 protein function with a negative predictive value of 80%. 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. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Nov 16, 2016

A variant of uncertain significance has been identified in the DSC2 gene. The A763T variant has been previously reported in at least one individual in association with HCM (Lopes et al., 2013; Lopes et al., 2015); however, Lopes et al. (2013) reported this individual harbored two additional cardiogenetic variants, including a nonsense variant in the MYBPC3 gene, and no segregation studies were reported. The A763T variant was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. Additionally, the A763T variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. Nevertheless, this substitution occurs at a position that is not conserved across species and Threonine is tolerated at this position in multiple species. Furthemore, in silico analysis predicts this variant likely does not alter the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is pathogenic or rare benign. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Mar 10, 2023

This missense variant replaces alanine with threonine at codon 763 of the DSC2 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in an individual affected with hypertrophic cardiomyopathy, who also carried a pathogenic truncation variant in the MYBPC3 gene (PMID: 23396983). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 10, 2021

The p.A763T variant (also known as c.2287G>A), located in coding exon 15 of the DSC2 gene, results from a G to A substitution at nucleotide position 2287. The alanine at codon 763 is replaced by threonine, an amino acid with similar properties. This variant co-occurred with an MYBPC3 nonsense alteration in an individual from a hypertrophic cardiomyopathy cohort (Lopes LR et al. J Med Genet, 2013 Apr;50:228-39). This amino acid position is poorly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Familial isolated arrhythmogenic right ventricular dysplasia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Jul 23, 2024

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.064

BayesDel_addAF

Benign

-0.54

BayesDel_noAF

Benign

-0.71

CADD

Benign

0.17

DANN

Benign

0.74

DEOGEN2

Benign

0.038

T;.;.

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.0020

LIST_S2

Benign

0.31

T;T;T

M_CAP

Benign

0.013

MetaRNN

Benign

0.049

T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.22

N;N;.

PrimateAI

Benign

0.24

PROVEAN

Benign

-0.12

N;N;.

REVEL

Benign

0.018

Sift

Benign

0.62

T;T;.

Sift4G

Benign

0.57

T;T;.

Polyphen

0.0010

B;B;.

Vest4

0.049

MVP

0.32

MPC

0.071

ClinPred

0.79

GERP RS

-2.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.026

gMVP

0.17

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over