18-31080357-G-A

Position:

• chr18-31080357-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_024422.6(DSC2):​c.1264-5C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000484 in 1,613,350 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0026 (4 hom., cov: 33)
  • Exomes 𝑓: 0.00026 (2 hom.)
• Consequence: DSC2 NM_024422.6 splice_region, intron
• Scores: Splicing: ADA: 0.00002288
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:11
• Conservation: PhyloP100: 2.54

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BP6: Variant 18-31080357-G-A is Benign according to our data. Variant chr18-31080357-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 46165.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr18-31080357-G-A is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00261 (398/152278) while in subpopulation AFR AF= 0.00912 (379/41550). AF 95% confidence interval is 0.00836. There are 4 homozygotes in gnomad4. There are 192 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 4 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DSC2	NM_024422.6	c.1264-5C>T		splice_region_variant, intron_variant		ENST00000280904.11	NP_077740.1
DSC2	NM_004949.5	c.1264-5C>T		splice_region_variant, intron_variant			NP_004940.1
DSC2	NM_001406506.1	c.835-5C>T		splice_region_variant, intron_variant			NP_001393435.1
DSC2	NM_001406507.1	c.835-5C>T		splice_region_variant, intron_variant			NP_001393436.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DSC2	ENST00000280904.11	c.1264-5C>T		splice_region_variant, intron_variant		1	NM_024422.6	ENSP00000280904.6
DSC2	ENST00000251081.8	c.1264-5C>T		splice_region_variant, intron_variant		1		ENSP00000251081.6
DSC2	ENST00000648081.1	c.835-5C>T		splice_region_variant, intron_variant				ENSP00000497441.1
DSC2	ENST00000682357.1	c.835-5C>T		splice_region_variant, intron_variant				ENSP00000507826.1

Frequencies

GnomAD3 genomes AF: 0.00262 AC: 399 AN: 152160 Hom.: 4 Cov.: 33

Gnomad AFR AF: 0.00917

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000983

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: 0.0000147

Gnomad OTH AF: 0.00144

GnomAD3 exomes AF: 0.000688 AC: 172 AN: 250080 Hom.: 1 AF XY: 0.000592 AC XY: 80 AN XY: 135162

Gnomad AFR exome AF: 0.00991

Gnomad AMR exome AF: 0.000203

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000654

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000177

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000262 AC: 383 AN: 1461072 Hom.: 2 Cov.: 33 AF XY: 0.000230 AC XY: 167 AN XY: 726764

Gnomad4 AFR exome AF: 0.00983

Gnomad4 AMR exome AF: 0.000179

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000812

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000810

Gnomad4 OTH exome AF: 0.000480

GnomAD4 genome AF: 0.00261 AC: 398 AN: 152278 Hom.: 4 Cov.: 33 AF XY: 0.00258 AC XY: 192 AN XY: 74460

Gnomad4 AFR AF: 0.00912

Gnomad4 AMR AF: 0.000981

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00128 Hom.: 1

Bravo AF: 0.00295

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:11

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 19, 2012	c.1264-5C>T in Intron 09 of DSC2: This variant is not expected to have clinical significance because it has been identified in 1.0% (38/3738) of African America n chromosomes from a broad population by the NHLBI Exome Sequencing Project (htt p://evs.gs.washington.edu/EVS;). -
Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -

Arrhythmogenic right ventricular dysplasia 11 Benign:2

Benign, criteria provided, single submitter	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	Jun 28, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -

Cardiomyopathy Benign:2

Benign, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Aug 22, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Oct 16, 2018	- -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2015	- -
Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Feb 08, 2022	- -

Cardiovascular phenotype Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 25, 2015

This alteration is classified as 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. -

Familial isolated arrhythmogenic right ventricular dysplasia Benign:1

Benign, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Sep 23, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	5.8
DANN	Benign	0.47

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000023
dbscSNV1_RF	Benign	0.0
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

Other links and lift over

dbSNP: rs183614856; hg19: chr18-28660323;