chr18-31519929-A-G

Position:

chr18-31519929-A-G

Variant summary

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

The NM_001943.5(DSG2):c.208A>G(p.Ile70Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000242 in 1,614,050 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 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000023 ( 0 hom. )

Consequence

DSG2
NM_001943.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 4.55

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 (HGNC:):

DSG2 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=0.15702766).

BS2

High AC in GnomAd4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DSG2	NM_001943.5 linkuse as main transcript	c.208A>G	p.Ile70Val	missense_variant	3/15	ENST00000261590.13	NP_001934.2	Q14126
DSG2	XM_047437315.1 linkuse as main transcript	c.-327A>G		5_prime_UTR_variant	4/16		XP_047293271.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DSG2	ENST00000261590.13 linkuse as main transcript	c.208A>G	p.Ile70Val	missense_variant	3/15	1	NM_001943.5	ENSP00000261590.8		Q14126

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152176

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000401

AC:

AN:

249482

Hom.:

AF XY:

0.0000517

AC XY:

AN XY:

135354

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000579

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000556

Gnomad SAS exome

AF:

0.000163

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000177

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000226

AC:

AN:

1461874

Hom.:

Cov.:

AF XY:

0.0000248

AC XY:

AN XY:

727236

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000812

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152176

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74346

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000580

Hom.:

Bravo

AF:

0.0000340

ExAC

AF:

0.0000497

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 28, 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 report in individual who also carried truncating PKP2 variant; ExAC: 3/16510 South Asian chromosomes -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Dec 12, 2023

This missense variant replaces isoleucine with valine at codon 70 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 who also carried a pathogenic truncation variant in the PKP2 gene (PMID: 22458570). This variant has also been reported in an individual with hypertrophic cardiomyopathy (PMID: 26656175). This variant has been identified in 11/280880 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 cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Feb 05, 2024

Arrhythmogenic right ventricular dysplasia 10

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 18, 2024

This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 70 of the DSG2 protein (p.Ile70Val). This variant is present in population databases (rs769713919, gnomAD 0.02%). This missense change has been observed in individual(s) with clinical features of DSG2-related conditions (PMID: 22458570, 26656175). ClinVar contains an entry for this variant (Variation ID: 263501). 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 with a negative predictive value of 95%. 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

Feb 29, 2016

The I70V variant of uncertain significance has been reported previously in one individual with ARVC who alsoharbored a nonsense variant in the PKP2 gene (Rajkumar et al., 2012). This variant has also been observed in oneother individual referred for arrhythmia testing at GeneDx, though segregation data is absent. The I70V variant wasnot observed in approximately 6,000 individuals of European and African American ancestry in the NHLBI ExomeSequencing Project, indicating it is not a common benign variant in these populations. Although the I70V variantoccurs at a position that is conserved across species, it is a conservative amino acid substitution, which is not likelyto impact secondary protein structure as these residues share similar properties. Consequently, in silico analysis isinconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function.Therefore, based on the currently available information, it is unclear whether this variant is pathogenic or benign. -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Feb 08, 2022

- -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 21, 2022

The p.I70V variant (also known as c.208A>G), located in coding exon 3 of the DSG2 gene, results from an A to G substitution at nucleotide position 208. The isoleucine at codon 70 is replaced by valine, an amino acid with highly similar properties. This alteration was reported in a hypertrophic cardiomyopathy (HCM) cohort and in an individual with hearing loss; however, clinical details were limited and additional variants were detected (Bottillo I et al. Gene, 2016 Feb;577:227-35; Zhou Y et al. BMC Med Genet. 2020 Jul;21(1):151). Additionally, this variant was detected in a patient with arrhythmogenic right ventricular cardiomyopathy (ARVC) who also carried a pathogenic truncating mutation in PKP2. The patient's two clinically unaffected family members had either this alteration or the PKP2 truncating alteration. (Rajkumar et al. BMC Med Genet 2012;13:21). This amino acid position is highly 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.096

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.36

CADD

Benign

DANN

Benign

0.87

DEOGEN2

Benign

0.17

T;T

Eigen

Benign

-0.49

Eigen_PC

Benign

-0.30

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.68

T;T

M_CAP

Benign

0.032

MetaRNN

Benign

0.16

T;T

MetaSVM

Benign

-0.94

MutationAssessor

Benign

1.4

L;.

PrimateAI

Benign

0.41

PROVEAN

Benign

-0.93

N;.

REVEL

Benign

0.067

Sift

Pathogenic

0.0

D;.

Sift4G

Pathogenic

0.0

D;T

Polyphen

0.0010

B;.

Vest4

0.36

MVP

0.69

MPC

0.062

ClinPred

0.20

GERP RS

4.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.24

gMVP

0.78

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