chr18-31326608-C-T

Variant names:

• chr18-31326608-C-T
• rs397515639
• NM_001942.4:c.76C>T

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001942.4(DSG1):​c.76C>T​(p.Arg26*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,450,972 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. R26R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: DSG1 NM_001942.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 0.940
• Publications: 4 publications found

Genes affected

DSG1 (HGNC:3048): (desmoglein 1) This gene encodes a member of the desmoglein protein subfamily. Desmogleins, along with desmocollins, 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 desmoglein family members on chromosome 18. The encoded protein has been identified as a target of auto-antibodies in the autoimmune skin blistering disease pemphigus foliaceus. Disruption of this gene has also been associated with the skin diseases palmoplantar keratoderma and erythroderma. [provided by RefSeq, Feb 2015]

DSG1 Gene-Disease associations (from GenCC):

• palmoplantar keratoderma i, striate, focal, or diffuse

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, PanelApp Australia, G2P
• severe dermatitis-multiple allergies-metabolic wasting syndrome

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, G2P, Genomics England PanelApp, PanelApp Australia, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae)
• diffuse palmoplantar keratoderma with painful fissures

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• focal palmoplantar keratoderma with joint keratoses

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• striate palmoplantar keratoderma

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 33 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 18-31326608-C-T is Pathogenic according to our data. Variant chr18-31326608-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 88657.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DSG1	NM_001942.4	c.76C>T	p.Arg26*	stop_gained	Exon 2 of 15	ENST00000257192.5	NP_001933.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DSG1	ENST00000257192.5	c.76C>T	p.Arg26*	stop_gained	Exon 2 of 15	1	NM_001942.4	ENSP00000257192.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000138 AC: 2 AN: 1450972 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 722408

African (AFR) AF: 0.00 AC: 0 AN: 33234

American (AMR) AF: 0.00 AC: 0 AN: 44674

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25996

East Asian (EAS) AF: 0.00 AC: 0 AN: 39466

South Asian (SAS) AF: 0.00 AC: 0 AN: 85462

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53338

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5734

European-Non Finnish (NFE) AF: 0.00000181 AC: 2 AN: 1103006

Other (OTH) AF: 0.00 AC: 0 AN: 60062

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Palmoplantar keratoderma i, striate, focal, or diffuse Pathogenic:1

Mar 01, 2009

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

not provided Pathogenic:1

Jul 08, 2025

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25525159, 11313759, 27534273, 15897387, 19157795) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	37
DANN	Uncertain	0.99
Eigen	Uncertain	0.24
Eigen_PC	Benign	0.044
FATHMM_MKL	Uncertain	0.94	D
PhyloP100		0.94
Vest4		0.86
GERP RS		2.9
Mutation Taster		=6/194	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
Splicevardb		2.0
SpliceAI score (max)		0.010		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: rs397515639; hg19: chr18-28906571;