rs794728072

Variant names:

• chr18-31071603-AC-A
• rs794728072
• NM_024422.6:c.2125+1delG

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PVS1_Moderate PM2 PP5

The NM_024422.6(DSC2):​c.2125+1delG variant causes a splice donor, intron change. The variant allele was found at a frequency of 0.00000205 in 1,460,652 control chromosomes in the GnomAD database, with no homozygous occurrence. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: DSC2 NM_024422.6 splice_donor, intron
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:7 U:2
• Conservation: PhyloP100: 4.30
• Publications: 0 publications found

Genes affected

DSC2 (HGNC:3036): (desmocollin 2) This gene encodes a member of the desmocollin protein subfamily. Desmocollins, along with desmogleins, 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 desmocollin family members on chromosome 18. Mutations in this gene are associated with arrhythmogenic right ventricular dysplasia-11, and reduced protein expression has been described in several types of cancer. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2015]

DSC2 Gene-Disease associations (from GenCC):

• familial isolated arrhythmogenic right ventricular dysplasia

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• arrhythmogenic right ventricular dysplasia 11

  Inheritance: AR, SD, AD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• colorectal adenoma

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

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

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.08758315 fraction of the gene. Cryptic splice site detected, with MaxEntScore 4.3, offset of 44, new splice context is: aaaGTaact. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 18-31071603-AC-A is Pathogenic according to our data. Variant chr18-31071603-AC-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 199778.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024422.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DSC2	NM_024422.6	MANE Select	c.2125+1delG		splice_donor intron	N/A	NP_077740.1	Q02487-1
	DSC2	NM_004949.5		c.2125+1delG		splice_donor intron	N/A	NP_004940.1	Q02487-2
	DSC2	NM_001406506.1		c.1696+1delG		splice_donor intron	N/A	NP_001393435.1	A0A3B3ISU0

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DSC2	ENST00000280904.11	TSL:1 MANE Select	c.2125+1delG		splice_donor intron	N/A	ENSP00000280904.6	Q02487-1
	DSC2	ENST00000251081.8	TSL:1	c.2125+1delG		splice_donor intron	N/A	ENSP00000251081.6	Q02487-2
	DSC2	ENST00000713707.1		c.2125+1delG		splice_donor intron	N/A	ENSP00000519010.1	A0AAQ5BGP6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1460652 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726756

African (AFR) AF: 0.00 AC: 0 AN: 33458

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.00 AC: 0 AN: 39690

South Asian (SAS) AF: 0.00 AC: 0 AN: 86228

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53412

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1110900

Other (OTH) AF: 0.00 AC: 0 AN: 60350

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
4	-	-	Arrhythmogenic right ventricular dysplasia 11 (4)
2	-	-	not provided (2)
-	1	-	Cardiomyopathy (1)
1	-	-	Dilated cardiomyopathy 1A (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		4.3
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.96		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.45		Position offset: 46
DS_DL_spliceai		0.96		Position offset: 2

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.

Other links and lift over

dbSNP: rs794728072;

hg19: chr18-28651569;