rs139326669

Positions:

• chr18-31531023-A-G

Variant summary

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

The NM_001943.5(DSG2):​c.1051A>G​(p.Ser351Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000411 in 1,614,100 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0023 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00022 (2 hom.)
• Consequence: DSG2 NM_001943.5 missense
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:14
• Conservation: PhyloP100: 1.71

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 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.0108831525).
• BP6: Variant 18-31531023-A-G is Benign according to our data. Variant chr18-31531023-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 44277.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr18-31531023-A-G is described in Lovd as [Benign]. Variant chr18-31531023-A-G is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00227 (345/152312) while in subpopulation AFR AF= 0.00801 (333/41568). AF 95% confidence interval is 0.0073. There are 0 homozygotes in gnomad4. There are 170 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 345 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DSG2	NM_001943.5	c.1051A>G	p.Ser351Gly	missense_variant	9/15	ENST00000261590.13	NP_001934.2
DSG2	XM_047437315.1	c.517A>G	p.Ser173Gly	missense_variant	10/16		XP_047293271.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DSG2	ENST00000261590.13	c.1051A>G	p.Ser351Gly	missense_variant	9/15	1	NM_001943.5	ENSP00000261590.8
DSG2	ENST00000683614.2	n.882A>G		non_coding_transcript_exon_variant	7/7

Frequencies

GnomAD3 genomes AF: 0.00225 AC: 343 AN: 152194 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00799

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000524

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: 0.000956

GnomAD3 exomes AF: 0.000578 AC: 144 AN: 249292 Hom.: 1 AF XY: 0.000488 AC XY: 66 AN XY: 135258

Gnomad AFR exome AF: 0.00781

Gnomad AMR exome AF: 0.000493

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000265

Gnomad OTH exome AF: 0.000330

GnomAD4 exome AF: 0.000218 AC: 319 AN: 1461788 Hom.: 2 Cov.: 31 AF XY: 0.000184 AC XY: 134 AN XY: 727194

Gnomad4 AFR exome AF: 0.00768

Gnomad4 AMR exome AF: 0.000492

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: 0.0000108

Gnomad4 OTH exome AF: 0.000447

GnomAD4 genome AF: 0.00227 AC: 345 AN: 152312 Hom.: 0 Cov.: 32 AF XY: 0.00228 AC XY: 170 AN XY: 74480

Gnomad4 AFR AF: 0.00801

Gnomad4 AMR AF: 0.000523

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: 0.000946

Alfa AF: 0.000403 Hom.: 1

Bravo AF: 0.00248

ESP6500AA AF: 0.00655 AC: 24

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.000728 AC: 88

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:14

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:5

Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jul 13, 2020	Variant summary: DSG2 c.1051A>G (p.Ser351Gly) results in a non-conservative amino acid change located in the Cadherin-like domain (IPR002126) of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00058 in 249292 control chromosomes, predominantly at a frequency of 0.0078 within the African or African-American subpopulation in the gnomAD database, including 1 homozygote. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 312-fold of the estimated maximal expected allele frequency for a pathogenic variant in DSG2 causing Cardiomyopathy phenotype (2.5e-05), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. c.1051A>G has been reported in the literature in individuals affected with Cardiomyopathy (e.g. Pugh_2014, Quarta_2011). These reports do not provide unequivocal conclusions about association of the variant with Cardiomyopathy. A co-occurrence with a pathogenic variant has been reported (TTR c.424G>A, p.Val142Ile; Internal testing). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Five ClinVar submitters (evaluation after 2014) cite the variant as benign/likely benign. Based on the evidence outlined above, the variant was classified as benign. -
Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Apr 25, 2012	Ser351Gly in exon 9 of DSG2: This variant has been identified in 2 individuals w ith ARVC and was absent from 600 control chromosomes (Quarta 2011). However, thi s variant is not expected to have clinical significance because it is not locate d within the splice consensus sequence and has been identified in 0.6% (19/2964) of African American chromosomes from a broad, though clinically unspecified pop ulation (dbSNP rs139326669, NHLBI Exome Sequencing Project; http://evs.gs.washin gton.edu/EVS) -
Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 21, 2014	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -

not provided Benign:3

Likely benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Cardiomyopathy Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Feb 15, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Nov 14, 2018	- -

Arrhythmogenic right ventricular dysplasia 10 Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Oct 15, 2018	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 29, 2024	- -

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

Benign, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Jul 27, 2021

- -

Cardiovascular phenotype Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 09, 2019

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	-0.50	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	19
DANN	Benign	0.92
DEOGEN2	Benign	0.14	T
Eigen	Benign	-0.71
Eigen_PC	Benign	-0.61
FATHMM_MKL	Benign	0.54	D
LIST_S2	Benign	0.52	T
M_CAP	Benign	0.0083	T
MetaRNN	Benign	0.011	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.93	L
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.72	N
REVEL	Benign	0.014
Sift	Benign	0.28	T
Sift4G	Benign	0.38	T
Polyphen		0.0050	B
Vest4		0.42
MVP		0.54
MPC		0.24
ClinPred		0.0045	T
GERP RS		2.8
Varity_R		0.20
gMVP		0.50

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

Other links and lift over

dbSNP: rs139326669; hg19: chr18-29110986;