chr18-31546553-C-T

Position:

chr18-31546553-C-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The ENST00000261590.13(DSG2):c.3167C>T(p.Thr1056Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000737 in 1,614,096 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000078 ( 0 hom. )

Consequence

DSG2
ENST00000261590.13 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:9

Conservation

PhyloP100: 0.860

Variant links:

Genes affected

DSG2 (HGNC:3049): (desmoglein 2) This gene encodes a member of the desmoglein family and cadherin cell adhesion molecule superfamily of proteins. Desmogleins are calcium-binding transmembrane glycoprotein components of desmosomes, cell-cell junctions between epithelial, myocardial, and other cell types. The encoded preproprotein is proteolytically processed to generate the mature glycoprotein. This gene is present in a gene cluster with other desmoglein gene family members on chromosome 18. Mutations in this gene have been associated with arrhythmogenic right ventricular dysplasia, familial, 10. [provided by RefSeq, Jan 2016]

DSG2 links:

DSG2-AS1 (HGNC:51311): (DSG2 antisense RNA 1)

DSG2-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.10888842).

BS2

High AC in GnomAd4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
DSG2	NM_001943.5 linkuse as main transcript	c.3167C>T	p.Thr1056Ile	missense_variant	15/15	ENST00000261590.13	NP_001934.2
DSG2-AS1	NR_045216.1 linkuse as main transcript	n.1346-647G>A		intron_variant, non_coding_transcript_variant
DSG2	XM_047437315.1 linkuse as main transcript	c.2633C>T	p.Thr878Ile	missense_variant	16/16		XP_047293271.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
DSG2	ENST00000261590.13 linkuse as main transcript	c.3167C>T	p.Thr1056Ile	missense_variant	15/15	1	NM_001943.5	ENSP00000261590	P1
DSG2-AS1	ENST00000583706.5 linkuse as main transcript	n.1384-647G>A		intron_variant, non_coding_transcript_variant		5
DSG2-AS1	ENST00000657343.1 linkuse as main transcript	n.697-647G>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes

AF:

0.0000328

AC:

AN:

152224

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000200

AC:

AN:

249434

Hom.:

AF XY:

0.0000222

AC XY:

AN XY:

135310

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000442

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000780

AC:

114

AN:

1461872

Hom.:

Cov.:

AF XY:

0.0000646

AC XY:

AN XY:

727236

show subpopulations

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:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000998

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152224

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74372

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000135

Hom.:

Bravo

AF:

0.0000567

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Cardiomyopathy

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Sep 19, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Mar 16, 2023	This missense variant replaces threonine with isoleucine at codon 1056 of the DSG2 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 arrhythmogenic right ventricular cardiomyopathy (PMID: 21606390) and in an individual affected with dilated cardiomyopathy (PMID: 31983221). This variant has been identified in 5/249434 chromosomes 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. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jun 16, 2016

Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: Only 1 report; ClinVar: 1 VUS -

Arrhythmogenic right ventricular cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Jul 20, 2024

This missense variant replaces threonine with isoleucine at codon 1056 of the DSG2 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 arrhythmogenic right ventricular cardiomyopathy (PMID: 21606390) and in an individual affected with dilated cardiomyopathy (PMID: 31983221). This variant has been identified in 5/249434 chromosomes 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. -

Arrhythmogenic right ventricular dysplasia 10

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 18, 2022

This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 1056 of the DSG2 protein (p.Thr1056Ile). This variant is present in population databases (rs767538450, gnomAD 0.004%). This missense change has been observed in individual(s) with arrhythmogenic right ventricular cardiomyopathy or dilated cardiomyopathy (PMID: 21606390, 31983221). ClinVar contains an entry for this variant (Variation ID: 199821). 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 DSG2 protein function. 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 provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Nov 05, 2024

Identified in patients with ARVC, DCM, and Sudden Arrhythmic Death Syndrome (SADS) in published literature (PMID: 25351510, 31983221, 26498160, 21606390); Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis indicates that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 31402444, 31983221, 21606390, 26498160, 25351510) -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 14, 2023

The p.T1056I variant (also known as c.3167C>T), located in coding exon 15 of the DSG2 gene, results from a C to T substitution at nucleotide position 3167. The threonine at codon 1056 is replaced by isoleucine, an amino acid with similar properties. This alteration has been reported in a hypertrophic cardiomyopathy cohort, a dilated cardiomyopathy cohort, a sudden arrhythmic death syndrome cohort, and an arrhythmogenic right ventricular cardiomyopathy cohort; however, clinical details were limited in these cases (Quarta G et al. Circulation, 2011 Jun;123:2701-9; Lopes LR et al. Heart, 2015 Feb;101:294-301; Nunn LM et al. Europace, 2016 Jun;18:888-96; Mazzarotto F et al. Circulation, 2020 Feb;141:387-398). This amino acid position is not well 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. -

Arrhythmogenic right ventricular dysplasia 10;C2752072:Dilated cardiomyopathy 1BB

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 04, 2021

- -

Dilated cardiomyopathy 1BB

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Jun 11, 2020

Based on the classification scheme VCGS_Germline_v1.1.1, this variant is classified as 3B-VUS. Following criteria are met: 0103 - Both loss- and gain-of-function are known mechanisms of disease for this gene. Many pathogenic variants resulting in protein termination codons, suggest loss-of-function as the potential mechanism. However, functional studies of missense variants are consistent with a gain-of-function effect (PMID: 23071725). (N) 0108 - This gene is known to be associated with both recessive and dominant disease. Digenic inheritance is reported for both arrhythmogenic right ventricular cardiomyopathy (ARVC) and dilated cardiomyopathy (DCM), however DCM is more commonly associated with dominant disease (PMID: 28818065, 18678517). (N) 0112 - Variants in this gene are known to have reduced penetrance (OMIM). (N) 0200 - Variant is predicted to result in a missense amino acid change from a threonine to an isoleucine (exon 15). (N) 0251 - Variant is heterozygous. (N) 0302 - Variant is present in gnomAD <0.001 for a dominant condition (5 heterozygotes, 0 homozygotes). (P) 0503 - Missense variant consistently predicted to be tolerated or not conserved in mammals with a minor amino acid change. (B) 0604 - Variant is not located in an established domain, motif, hotspot or informative constraint region. (N) 0705 - No comparable variants have previous evidence for pathogenicity. (N) 0804 - Variant has previously been described as variant of uncertain significance in multiple independent cases of ARVC (ClinVar, PMID: 21606390). (N) 0905 - No segregation evidence has been identified for this variant. (N) 1007 - No published functional evidence has been identified for this variant. (N) 1208 - Inheritance information for this variant is not currently available. (N) Legend: (P) - Pathogenic, (N) - Neutral, (B) - Benign -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.37

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.15

Eigen

Benign

-0.52

Eigen_PC

Benign

-0.48

FATHMM_MKL

Benign

0.27

LIST_S2

Benign

0.65

M_CAP

Benign

0.022

MetaRNN

Benign

0.11

MetaSVM

Benign

-0.83

MutationAssessor

Benign

1.8

MutationTaster

Benign

1.0

PrimateAI

Benign

0.30

PROVEAN

Benign

-0.80

REVEL

Benign

0.17

Sift

Benign

0.059

Sift4G

Benign

0.54

Polyphen

0.27

Vest4

0.15

MVP

0.80

MPC

0.18

ClinPred

0.061

GERP RS

1.8

Varity_R

0.046

gMVP

0.35

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

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