18-31086719-C-G

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PP3_Strong

The NM_024422.6(DSC2):c.799G>C(p.Ala267Pro) variant causes a missense change. The variant allele was found at a frequency of 0.00000616 in 1,461,810 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A267G) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

DSC2
NM_024422.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 7.01

Publications

1 publications found

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 Gene-Disease associations (from GenCC):

familial isolated arrhythmogenic right ventricular dysplasia
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
arrhythmogenic right ventricular dysplasia 11
Inheritance: AR, AD, SD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
colorectal adenoma
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

DSC2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.98

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DSC2	NM_024422.6 link	c.799G>C	p.Ala267Pro	missense_variant	Exon 7 of 16	ENST00000280904.11	NP_077740.1	Q02487-1
DSC2	NM_004949.5 link	c.799G>C	p.Ala267Pro	missense_variant	Exon 7 of 17		NP_004940.1	Q02487-2
DSC2	NM_001406506.1 link	c.370G>C	p.Ala124Pro	missense_variant	Exon 7 of 16		NP_001393435.1
DSC2	NM_001406507.1 link	c.370G>C	p.Ala124Pro	missense_variant	Exon 7 of 17		NP_001393436.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DSC2	ENST00000280904.11 link	c.799G>C	p.Ala267Pro	missense_variant	Exon 7 of 16	1	NM_024422.6	ENSP00000280904.6		Q02487-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251240

AF XY:

0.00000736

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000616

AC:

AN:

1461810

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

727192

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44714

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39688

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00000809

AC:

AN:

1111972

Other (OTH)

AF:

0.00

AC:

AN:

60390

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.458

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 26, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.Ala267Pro variant in DSC2 has not been previously reported in individuals with cardiomyopathy and is absent from large population studies. Computational p rediction tools and conservation analysis suggest that this variant may impact t he protein, though this information is not predictive enough to determine pathog enicity. In summary, the clinical significance of the p.Ala267Pro variant is unc ertain. -

Arrhythmogenic right ventricular dysplasia 11

Uncertain:1

Oct 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 267 of the DSC2 protein (p.Ala267Pro). This variant is present in population databases (no rsID available, gnomAD 0.0009%). This missense change has been observed in individual(s) with dilated cardiomyopathy (PMID: 27532257). ClinVar contains an entry for this variant (Variation ID: 504982). 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 expected to disrupt DSC2 protein function with a positive 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. -

Cardiomyopathy

Uncertain:1

Apr 17, 2023

Color Diagnostics, LLC DBA Color Health

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This missense variant replaces alanine with proline at codon 267 of the DSC2 protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in a dilated cardiomyopathy (PMID: 27532257). This variant has been identified in 1/251240 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. -

Cardiovascular phenotype

Uncertain:1

Dec 03, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.A267P variant (also known as c.799G>C), located in coding exon 7 of the DSC2 gene, results from a G to C substitution at nucleotide position 799. The alanine at codon 267 is replaced by proline, an amino acid with highly similar properties. This variant was reported in individual(s) from dilated cardiomyopathy cohorts (Walsh R et al. Genet Med, 2017 Feb;19:192-203; Mazzarotto F et al. Circulation, 2020 Feb;141:387-398). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Familial isolated arrhythmogenic right ventricular dysplasia

Uncertain:1

Jun 08, 2023

All of Us Research Program, National Institutes of Health

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.36

BayesDel_noAF

Pathogenic

0.28

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.61

D;.;.

Eigen

Pathogenic

1.0

Eigen_PC

Pathogenic

0.86

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.97

D;D;D

M_CAP

Pathogenic

0.29

MetaRNN

Pathogenic

0.98

D;D;D

MetaSVM

Uncertain

0.66

MutationAssessor

Pathogenic

4.4

H;H;.

PhyloP100

7.0

PrimateAI

Uncertain

0.61

PROVEAN

Uncertain

-4.2

D;D;.

REVEL

Pathogenic

0.66

Sift

Uncertain

0.0020

D;D;.

Sift4G

Uncertain

0.0060

D;D;.

Polyphen

1.0

D;D;.

Vest4

0.97

MutPred

0.89

Gain of disorder (P = 0.0363);Gain of disorder (P = 0.0363);.;

MVP

0.90

MPC

0.48

ClinPred

1.0

GERP RS

5.6

Varity_R

0.97

gMVP

0.94

Mutation Taster

=4/96

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over