18-31520877-A-C

Variant names:

• chr18-31520877-A-C
• rs727502983
• NM_001943.5:c.291A>C
• DSG2 p.Pro97Pro

GermlineCancer (beta)

Variant summary

Our verdict is Likely benign.

-2 Likely Benign

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received -2 classification points (ACGS-UK Somatic Oncogenicity v2025). O3_ModerateB4_Strong

The NM_001943.5(DSG2):c.291A>C (p.Pro97Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The gene DSG2 is a tumor suppressor gene (CancerMine: 2 TSG, 5 oncogene, 1 driver citations). The gene DSG2 is a known oncogene (CancerMine: 2 TSG, 5 oncogene, 1 driver citations). The gene DSG2 is a cancer driver gene (CancerMine: 2 TSG, 5 oncogene, 1 driver citations). The variant has a gnomAD grpmax filtering allele frequency (95% CI) of 0.0000299, indicating it is observed in the general population. Note: a gnomAD entry for this variant shows a statistical allele-bias signature, consistent with mosaic/somatic contamination (e.g. age-related clonal hematopoiesis) rather than true inherited population frequency — this frequency should not be read as evidence of a common, benign germline variant. In-silico predictor (BayesDel (noAF)) classifies this variant as likely benign. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. Variant has been reported in ClinVar as Benign/Likely Benign (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: DSG2 NM_001943.5 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 0.163
• 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 Gene-Disease associations (from GenCC):

• arrhythmogenic right ventricular cardiomyopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• arrhythmogenic right ventricular dysplasia 10

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: G2P
• dilated cardiomyopathy 1BB

  Inheritance: AR, AD Classification: LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen

Classification according to ACGS-UK Somatic Oncogenicity v2025

Classification was made for transcript:

Our verdict: Likely_benign. The variant received -2 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	O3Absent or very rare in population		Absent or extremely rare in gnomAD (AC ≤ 2) — O3 moderate; GnomAD: AF = 0.000030, AC = 0 — absent/extremely rare (O3 moderate [+2])
	B4Synonymous/intronic, no splicing impact		Synonymous/intronic variant with confirmed no splicing impact (B4 strong); Synonymous variant — splicing algorithms confirm no impact on splicing (B4 strong [-4])

Variant Effect in Transcripts

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

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	DSG2 NM_001943.5	MANE Select	c.291A>C p.Pro97Pro	synonymous	Exon 4 of 15	Prot: NP_001934.2 UniProt:

DSG2 NM_001943.5

MANE Select

HGVSc / HGVSpc.291A>Cp.Pro97Pro

Exon rankExon 4 of 15

synonymous

Prot: NP_001934.2UniProt: Q14126

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	DSG2 ENST00000261590.13	TSL:1MANE Select	c.291A>C p.Pro97Pro	synonymous	Exon 4 of 15	Prot: ENSP00000261590.8 UniProt:
	DSG2 ENST00000713817.1		c.282A>C p.Pro94Pro	synonymous	Exon 5 of 16	Prot: ENSP00000519121.1 UniProt:
	DSG2 ENST00000713819.1		c.282A>C p.Pro94Pro	synonymous	Exon 6 of 17	Prot: ENSP00000519123.1 UniProt:

DSG2 ENST00000261590.13

TSL:1MANE Select

HGVSc / HGVSpc.291A>Cp.Pro97Pro

Exon rankExon 4 of 15

synonymous

Prot: ENSP00000261590.8UniProt: Q14126

DSG2 ENST00000713817.1

HGVSc / HGVSpc.282A>Cp.Pro94Pro

Exon rankExon 5 of 16

synonymous

Prot: ENSP00000519121.1UniProt: A0AAQ5BGZ7

DSG2 ENST00000713819.1

HGVSc / HGVSpc.282A>Cp.Pro94Pro

Exon rankExon 6 of 17

synonymous

Prot: ENSP00000519123.1UniProt: A0AAQ5BGZ7

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 5 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:32
GnomAD4 exome Warning	AF: 0.00000137	AC:2	Hom:0	AN:1461546	Cov:32
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:32
TOPMed (Bravo)	AF: 0.00000378	AC:1	Hom:0	AN:264690	Cov:
ALFA (dbGaP/dbSNP Allele Frequency Aggregator)	AF: 0.00	AC:0	Hom:0	AN:16840	Cov:

Showing 5 sources

Case/control cohorts

Cohort	Cases			Controls
	AF	AC	AN	AF	AC	AN
Epi25(Epilepsy)	0.00	0	41954	0.0000299	2	66888
SCHEMA(Schizophrenia)	0.000331	16	48284	0.000349	26	74396

Showing 2 cohortsAllele count / allele number. AF is computed from the counts for ASC (not provided by the source).

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Arrhythmogenic right ventricular dysplasia 10 (1)
-	-	1	Cardiovascular phenotype (1)
-	-	1	not specified (1)

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Benign	7.0
BayesDel_noAF	Benign	-0.47
CADD	Benign	8.8
DANN	Benign	0.71
GPN-Star LLR	N/A	-3.3
GPN-Star score	N/A	3.3
PhyloP100	Benign	0.16

Showing 7 of 7 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.030
SpliceAI score (max)	Benign	0.030	Details are displayed if max score is > 0.2

Showing 2 of 2 scores

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs727502983;

hg19: chr18-29100840;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar