rs876657790

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4BS2

The NM_001943.5(DSG2):c.308T>C(p.Val103Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000062 in 1,613,844 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000055 ( 0 hom. )

Consequence

DSG2
NM_001943.5 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 0.500

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.2642432).

BS2

High AC in GnomAdExome4 at 8 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DSG2	NM_001943.5 link	c.308T>C	p.Val103Ala	missense_variant	Exon 4 of 15	ENST00000261590.13	NP_001934.2	Q14126
DSG2	XM_047437315.1 link	c.-227T>C		5_prime_UTR_variant	Exon 5 of 16		XP_047293271.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DSG2	ENST00000261590.13 link	c.308T>C	p.Val103Ala	missense_variant	Exon 4 of 15	1	NM_001943.5	ENSP00000261590.8		Q14126

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152232

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:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000401

AC:

AN:

249158

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135200

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:

0.00000885

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000547

AC:

AN:

1461612

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

727102

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000630

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152232

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74378

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:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:2

Jan 27, 2017

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Val103Ala variant in DSG2 has been identified by our laboratory in one ind ividual with DCM and segregated with disease in one affected relative. Both of t hese individuals also carried a likely pathogenic variant in a different gene su fficient to cause disease. The p.Val103Ala has not been previously reported in t he literature and is absent from large population studies. Valine (Val) at posit ion 103 is not conserved in mammals or evolutionarily distant species and 1 mamm al (big brown bat) carries an alanine (Ala), raising the possibility that this c hange may be tolerated. Additional computational prediction tools do not provide strong support for or against an impact to the protein. In summary, the clinica l significance of the p.Val103Ala variant is uncertain. -

Feb 18, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: DSG2 c.308T>C (p.Val103Ala) results in a non-conservative amino acid change located in the Cadherin-like domain (IPR002126) of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4e-06 in 249158 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.308T>C has been reported in the literature in an individual with dilated cardiomyopathy and in an infant with severe sinus bradycardia, without strong evidence of causality (Mazzarotto_2020, Moisa_2023). The infant also had Diamond-Blackfan anemia and was found to carry a pathogenic variant in the RPS19 gene that was presumed to be de novo. These reports do not provide unequivocal conclusions about association of the variant with Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 36837563, 31983221). ClinVar contains an entry for this variant (Variation ID: 228627). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Arrhythmogenic right ventricular cardiomyopathy

Uncertain:1

Dec 01, 2023

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces valine with alanine at codon 103 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 at least one individual affected with dilated cardiomyopathy (PMID: 31983221; ClinVar: SCV000271711.2) and in one individual with Diamond-Blackfan anemia type 1 with sinus bradycardia who also carried a pathogenic variant in the RPS19 gene (PMID: 36837563). This variant has been identified in 1/249158 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. -

Cardiomyopathy

Uncertain:1

Oct 10, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Arrhythmogenic right ventricular dysplasia 10

Uncertain:1

Sep 02, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 103 of the DSG2 protein (p.Val103Ala). This variant is present in population databases (no rsID available, gnomAD 0.0009%). This missense change has been observed in individual(s) with bradycardia (PMID: 36837563). ClinVar contains an entry for this variant (Variation ID: 228627). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) 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

Oct 26, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Reported in an individual with sinus bradycardia and Diamond-Blackfan anemia who also harbored a de novo variant in the RPS19 gene (PMID: 36837563); This variant is associated with the following publications: (PMID: 36837563) -

Cardiovascular phenotype

Uncertain:1

Jul 29, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.V103A variant (also known as c.308T>C), located in coding exon 4 of the DSG2 gene, results from a T to C substitution at nucleotide position 308. The valine at codon 103 is replaced by alanine, an amino acid with similar properties. 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. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.034

BayesDel_noAF

Benign

-0.29

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Benign

0.40

T;T

Eigen

Benign

-0.26

Eigen_PC

Benign

-0.14

FATHMM_MKL

Uncertain

0.89

LIST_S2

Benign

0.53

T;T

M_CAP

Benign

0.024

MetaRNN

Benign

0.26

T;T

MetaSVM

Benign

-0.87

MutationAssessor

Benign

1.5

L;.

PrimateAI

Uncertain

0.49

PROVEAN

Uncertain

-3.1

D;.

REVEL

Benign

0.11

Sift

Uncertain

0.017

D;.

Sift4G

Uncertain

0.0030

D;D

Polyphen

0.31

B;.

Vest4

0.16

MutPred

0.48

Loss of sheet (P = 0.0126);Loss of sheet (P = 0.0126);

MVP

0.69

MPC

0.088

ClinPred

0.50

GERP RS

1.8

Varity_R

0.23

gMVP

0.62

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