chr18-31069009-C-A

Position:

chr18-31069009-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The ENST00000280904.11(DSC2):c.2393G>T(p.Arg798Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000107 in 1,613,882 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R798Q) has been classified as Benign.

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00011 ( 0 hom. )

Consequence

DSC2
ENST00000280904.11 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:1

Conservation

PhyloP100: -1.22

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 Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.2037181).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
DSC2	NM_024422.6 linkuse as main transcript	c.2393G>T	p.Arg798Leu	missense_variant	15/16	ENST00000280904.11	NP_077740.1
DSC2	NM_004949.5 linkuse as main transcript	c.2393G>T	p.Arg798Leu	missense_variant	15/17		NP_004940.1
DSC2	NM_001406506.1 linkuse as main transcript	c.1964G>T	p.Arg655Leu	missense_variant	15/16		NP_001393435.1
DSC2	NM_001406507.1 linkuse as main transcript	c.1964G>T	p.Arg655Leu	missense_variant	15/17		NP_001393436.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DSC2	ENST00000280904.11 linkuse as main transcript	c.2393G>T	p.Arg798Leu	missense_variant	15/16	1	NM_024422.6	ENSP00000280904	P1	Q02487-1
DSC2	ENST00000251081.8 linkuse as main transcript	c.2393G>T	p.Arg798Leu	missense_variant	15/17	1		ENSP00000251081		Q02487-2
DSC2	ENST00000648081.1 linkuse as main transcript	c.1964G>T	p.Arg655Leu	missense_variant	16/17			ENSP00000497441
DSC2	ENST00000682357.1 linkuse as main transcript	c.1964G>T	p.Arg655Leu	missense_variant	15/16			ENSP00000507826

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152036

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.0000358

AC:

AN:

251172

Hom.:

AF XY:

0.0000442

AC XY:

AN XY:

135750

show subpopulations

Gnomad AFR exome

AF:

0.0000615

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:

0.0000705

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000113

AC:

165

AN:

1461846

Hom.:

Cov.:

AF XY:

0.000118

AC XY:

AN XY:

727226

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

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:

0.000145

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152036

Hom.:

Cov.:

AF XY:

0.0000539

AC XY:

AN XY:

74248

show subpopulations

Gnomad4 AFR

AF:

0.0000483

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

Bravo

AF:

0.0000416

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 11

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 18, 2022	This sequence change replaces arginine, which is basic and polar, with leucine, which is neutral and non-polar, at codon 798 of the DSC2 protein (p.Arg798Leu). This variant is present in population databases (rs61731921, gnomAD 0.009%). This missense change has been observed in individual(s) with clinical features of DSC2-related conditions (PMID: 31534214, 31983221). ClinVar contains an entry for this variant (Variation ID: 46179). 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. 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Feb 23, 2022	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jan 11, 2013

Variant classified as Uncertain Significance - Favor Benign. The Arg798Leu varia nt in DSC2 has not been reported in the literature nor previously identified by our laboratory. This variant has also not been identified in large and broad Eur opean American and African American populations by the NHLBI Exome Sequencing Pr oject (http://evs.gs.washington.edu/EVS). However, we cannot exclude that it may be common in other populations. Arginine (Arg) at position 798 is not conserved in evolution, suggesting that a change may be tolerated. Computational analyses (biochemical amino acid properties, AlignGVGD, PolyPhen2, and SIFT) do not prov ide strong support for or against an impact to the protein. Although this data s upports that the Arg798Leu variant may be benign, additional studies are needed to fully assess its clinical significance. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Dec 14, 2022

This missense variant replaces arginine with leucine at codon 798 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 dilated cardiomyopathy (PMID: 31983221). This variant has aslo been identified in 11/282524 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 provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jan 26, 2023

Identified in association with sudden cardiac death and dilated cardiomyopathy (Lahrouchi et al, 2020; Mazzarotto et al., 2020); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 31534214, 31983221) -

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

Aug 06, 2024

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 04, 2022

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.20

BayesDel_noAF

Benign

-0.29

CADD

Benign

1.3

DANN

Benign

0.94

DEOGEN2

Uncertain

0.57

D;.;.

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.5

FATHMM_MKL

Benign

0.085

LIST_S2

Uncertain

0.96

D;D;D

M_CAP

Pathogenic

0.44

MetaRNN

Benign

0.20

T;T;T

MetaSVM

Benign

-0.28

MutationAssessor

Pathogenic

2.9

M;M;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.17

PROVEAN

Uncertain

-3.0

D;D;.

REVEL

Benign

0.28

Sift

Uncertain

0.0080

D;D;.

Sift4G

Uncertain

0.029

D;D;.

Polyphen

0.46

P;P;.

Vest4

0.27

MutPred

0.32

Gain of sheet (P = 0.0011);Gain of sheet (P = 0.0011);.;

MVP

0.63

MPC

0.18

ClinPred

0.19

GERP RS

-5.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.11

gMVP

0.37

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