18-31542836-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001943.5(DSG2):c.2318G>T(p.Arg773Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 12/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R773K) has been classified as Benign.

• Frequency: Genomes: not found (cov: 26)
• Consequence: DSG2 NM_001943.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.83

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

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DSG2	NM_001943.5	c.2318G>T	p.Arg773Ile	missense_variant	14/15	ENST00000261590.13
DSG2-AS1	NR_045216.1	n.1810+266C>A		intron_variant, non_coding_transcript_variant
DSG2	XM_047437315.1	c.1784G>T	p.Arg595Ile	missense_variant	15/16

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DSG2	ENST00000261590.13	c.2318G>T	p.Arg773Ile	missense_variant	14/15	1	NM_001943.5	P1
DSG2-AS1	ENST00000583706.5	n.1848+266C>A		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 26

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 26

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Benign	-0.019	T
BayesDel_noAF	Benign	-0.27
Cadd	Benign	22
Dann	Uncertain	0.97
DEOGEN2	Benign	0.42	T
Eigen	Benign	0.14
Eigen_PC	Benign	0.046
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.049	D
MetaRNN	Uncertain	0.43	T
MetaSVM	Benign	-0.49	T
MutationAssessor	Uncertain	2.7	M
MutationTaster	Benign	1.0	P
PrimateAI	Benign	0.30	T
PROVEAN	Uncertain	-3.6	D
REVEL	Benign	0.26
Sift	Uncertain	0.022	D
Sift4G	Uncertain	0.018	D
Polyphen		0.98	D
Vest4		0.40
MutPred		0.48		Loss of helix (P = 0.0558);
MVP		0.84
MPC		0.45
ClinPred		0.93	D
GERP RS		2.2
Varity_R		0.10
gMVP		0.41

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.12		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: rs2278792; hg19: chr18-29122799;