rs140850369

Positions:

• chr18-31538739-C-T

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.1652-12C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000291 in 1,612,624 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0016 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00016 (2 hom.)
• Consequence: DSG2 NM_001943.5 intron
• Scores: Splicing: ADA: 0.00003700
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:10
• Conservation: PhyloP100: -0.518

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]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BP6: Variant 18-31538739-C-T is Benign according to our data. Variant chr18-31538739-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 44284.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr18-31538739-C-T is described in Lovd as [Likely_benign]. Variant chr18-31538739-C-T is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00158 (240/152304) while in subpopulation AFR AF= 0.00553 (230/41572). AF 95% confidence interval is 0.00495. There are 0 homozygotes in gnomad4. There are 116 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 240 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DSG2	NM_001943.5	c.1652-12C>T		intron_variant		ENST00000261590.13	NP_001934.2
DSG2	XM_047437315.1	c.1118-12C>T		intron_variant			XP_047293271.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DSG2	ENST00000261590.13	c.1652-12C>T		intron_variant		1	NM_001943.5	ENSP00000261590.8

Frequencies

GnomAD3 genomes AF: 0.00158 AC: 240 AN: 152186 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00555

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000393

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: 0.000955

GnomAD3 exomes AF: 0.000402 AC: 100 AN: 248862 Hom.: 1 AF XY: 0.000356 AC XY: 48 AN XY: 135018

Gnomad AFR exome AF: 0.00517

Gnomad AMR exome AF: 0.000406

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: 0.0000266

Gnomad OTH exome AF: 0.000330

GnomAD4 exome AF: 0.000157 AC: 229 AN: 1460320 Hom.: 2 Cov.: 31 AF XY: 0.000132 AC XY: 96 AN XY: 726584

Gnomad4 AFR exome AF: 0.00541

Gnomad4 AMR exome AF: 0.000358

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: 0.00000990

Gnomad4 OTH exome AF: 0.000331

GnomAD4 genome AF: 0.00158 AC: 240 AN: 152304 Hom.: 0 Cov.: 32 AF XY: 0.00156 AC XY: 116 AN XY: 74482

Gnomad4 AFR AF: 0.00553

Gnomad4 AMR AF: 0.000392

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000208

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.000945

Alfa AF: 0.000651 Hom.: 0

Bravo AF: 0.00184

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:10

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:4

Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	May 10, 2021	Variant summary: DSG2 c.1652-12C>T alters a non-conserved nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. 4/4 computational tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.0004 in 248862 control chromosomes, predominantly at a frequency of 0.0052 within the African or African-American subpopulation in the gnomAD database, including 1 homozygotes. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 21 fold of the estimated maximal expected allele frequency for a pathogenic variant in DSG2 causing Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy phenotype (0.00025), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. To our knowledge, no occurrence of c.1652-12C>T in individuals affected with Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy and no experimental evidence demonstrating its impact on protein function have been reported. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Both laboratories classified the variant as benign. Based on the evidence outlined above, the variant was classified as benign. -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	May 29, 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. -
Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Apr 25, 2012	1652-12C>T in Intron 11 of DSG2: This variant is not expected to have clinical s ignificance because it has been identified in 0.4% (13/3106) of African American chromosomes from a broad population by the NHLBI Exome Sequencing Project (http ://evs.gs.washington.edu/EVS; dbSNP rs140850369). 1652-12C>T in intron 11 of DS G2 (rs140850369, allele frequency = 0.4%, 13/3106) -

not provided Benign:3

Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Likely benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Likely benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -

Arrhythmogenic right ventricular dysplasia 10 Benign:2

Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	May 16, 2017	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). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 29, 2024	- -

Cardiomyopathy Benign:1

Benign, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Nov 14, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	0.93
DANN	Benign	0.48
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000037
dbscSNV1_RF	Benign	0.0020
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: rs140850369; hg19: chr18-29118702;