chr18-31545814-T-A

Variant names:

• chr18-31545814-T-A
• rs1555628166
• NM_001943.5:c.2428T>A

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1 PM2 PP3

The NM_001943.5(DSG2):​c.2428T>A​(p.Ser810Thr) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. S810S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: DSG2 NM_001943.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.81
• Publications: 0 publications found

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-AS1 (HGNC:51311): (DSG2 antisense RNA 1)

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM1: In a modified_residue Phosphoserine (size 0) in uniprot entity DSG2_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.767

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001943.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DSG2	NM_001943.5	MANE Select	c.2428T>A	p.Ser810Thr	missense	Exon 15 of 15	NP_001934.2
	DSG2-AS1	NR_045216.1		n.1438A>T		non_coding_transcript_exon	Exon 4 of 6

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DSG2	ENST00000261590.13	TSL:1 MANE Select	c.2428T>A	p.Ser810Thr	missense	Exon 15 of 15	ENSP00000261590.8
	DSG2	ENST00000713817.1		c.2419T>A	p.Ser807Thr	missense	Exon 16 of 16	ENSP00000519121.1
	DSG2	ENST00000713819.1		c.2419T>A	p.Ser807Thr	missense	Exon 17 of 17	ENSP00000519123.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 10 Uncertain:1

Sep 16, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with DSG2-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with threonine at codon 810 of the DSG2 protein (p.Ser810Thr). The serine residue is highly conserved and there is a small physicochemical difference between serine and threonine.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.68	D
Eigen	Uncertain	0.67
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.73	T
M_CAP	Uncertain	0.23	D
MetaRNN	Pathogenic	0.77	D
MetaSVM	Uncertain	0.66	D
MutationAssessor	Pathogenic	3.0	M
PhyloP100		5.8
PrimateAI	Benign	0.41	T
PROVEAN	Uncertain	-2.5	D
REVEL	Pathogenic	0.66
Sift	Benign	0.046	D
Sift4G	Uncertain	0.011	D
Polyphen		1.0	D
Vest4		0.44
MutPred		0.53		Loss of disorder (P = 0.1077)
MVP		0.96
MPC		0.40
ClinPred		0.95	D
GERP RS		6.0
Varity_R		0.25
gMVP		0.72
Mutation Taster		=70/30	polymorphism

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

Other links and lift over

dbSNP: rs1555628166; hg19: chr18-29125777;