chr18-31520877-A-G

Variant names:

• chr18-31520877-A-G
• rs727502983
• NM_001943.5:c.291A>G
• 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>G (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 allele was found at a cumulative frequency of 0.000000684 (AC=1) in the gnomAD database across 1,461,546 control chromosomes (no homozygotes observed). The grpmax filtering allele frequency (95% CI) is 0.000000899. In-silico predictor (BayesDel (noAF)) classifies this variant as likely benign. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DSG2 NM_001943.5 synonymous
• Clinical Significance: Not reported in ClinVar
• 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 = 0.000001, AC = 1 — 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>G p.Pro97Pro	synonymous	Exon 4 of 15	Prot: NP_001934.2 UniProt:

DSG2 NM_001943.5

MANE Select

HGVSc / HGVSpc.291A>Gp.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>G p.Pro97Pro	synonymous	Exon 4 of 15	Prot: ENSP00000261590.8 UniProt:
	DSG2 ENST00000713817.1		c.282A>G p.Pro94Pro	synonymous	Exon 5 of 16	Prot: ENSP00000519121.1 UniProt:
	DSG2 ENST00000713819.1		c.282A>G p.Pro94Pro	synonymous	Exon 6 of 17	Prot: ENSP00000519123.1 UniProt:

DSG2 ENST00000261590.13

TSL:1MANE Select

HGVSc / HGVSpc.291A>Gp.Pro97Pro

Exon rankExon 4 of 15

synonymous

Prot: ENSP00000261590.8UniProt: Q14126

DSG2 ENST00000713817.1

HGVSc / HGVSpc.282A>Gp.Pro94Pro

Exon rankExon 5 of 16

synonymous

Prot: ENSP00000519121.1UniProt: A0AAQ5BGZ7

DSG2 ENST00000713819.1

HGVSc / HGVSpc.282A>Gp.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 3 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:32
GnomAD4 exome	AF: 6.84e-7	AC:1	Hom:0	AN:1461546	Cov:32
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:32

Showing 3 sources

Case/control cohorts

Cohort	Cases			Controls
	AF	AC	AN	AF	AC	AN
BipEx(Bipolar disorder (including schizoaffective))	0.00	0	28420	0.0000347	1	28844
Epi25(Epilepsy)	0.00	0	41954	0.0000150	1	66888
SCHEMA(Schizophrenia)	0.00	0	67800	0.00000751	1	133180

Showing 3 cohortsAllele count / allele number. AF is computed from the counts for ASC (not provided by the source).

ClinVar

Not reported in ClinVar

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Benign	4.2
BayesDel_noAF	Benign	-0.34
CADD	Benign	8.1
DANN	Benign	0.71
GPN-Star LLR	N/A	-2.1
GPN-Star score	N/A	2.1
PhyloP100	Benign	0.16
RBP_binding_hub_radar	N/A	0.0
RBP_regulation_power_radar	N/A	1.7

Showing 9 of 9 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.0
SpliceAI score (max)	Benign	0.0	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