rs375028675

Positions:

• chr6-7558149-C-G
• chr6-7558149-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000379802.8(DSP):​c.307C>G​(p.Arg103Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R103Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DSP ENST00000379802.8 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.435

Genes affected

DSP (HGNC:3052): (desmoplakin) This gene encodes a protein that anchors intermediate filaments to desmosomal plaques and forms an obligate component of functional desmosomes. Mutations in this gene are the cause of several cardiomyopathies and keratodermas, including skin fragility-woolly hair syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1369507).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DSP	NM_004415.4	c.307C>G	p.Arg103Gly	missense_variant	3/24	ENST00000379802.8	NP_004406.2
DSP	NM_001319034.2	c.307C>G	p.Arg103Gly	missense_variant	3/24		NP_001305963.1
DSP	NM_001008844.3	c.307C>G	p.Arg103Gly	missense_variant	3/24		NP_001008844.1
DSP	NM_001406591.1	c.307C>G	p.Arg103Gly	missense_variant	3/11		NP_001393520.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DSP	ENST00000379802.8	c.307C>G	p.Arg103Gly	missense_variant	3/24	1	NM_004415.4	ENSP00000369129	P2
DSP	ENST00000418664.2	c.307C>G	p.Arg103Gly	missense_variant	3/24	1		ENSP00000396591	A2
DSP	ENST00000710359.1	c.307C>G	p.Arg103Gly	missense_variant	3/24			ENSP00000518230	A2
DSP	ENST00000683563.1	n.199C>G		non_coding_transcript_exon_variant	3/4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251470 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135910

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461890 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727248

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 8;C1854063:Arrhythmogenic cardiomyopathy with wooly hair and keratoderma Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 22, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. This variant has not been reported in the literature in individuals affected with DSP-related conditions. This variant is present in population databases (rs375028675, gnomAD 0.0009%). This sequence change replaces arginine, which is basic and polar, with glycine, which is neutral and non-polar, at codon 103 of the DSP protein (p.Arg103Gly). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.065	T
BayesDel_noAF	Benign	-0.33
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.17	T;.
Eigen	Benign	-0.39
Eigen_PC	Benign	-0.18
FATHMM_MKL	Benign	0.58	D
LIST_S2	Benign	0.75	T;T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.14	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.20	N;N
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-0.58	N;N
REVEL	Benign	0.10
Sift	Benign	0.15	T;T
Sift4G	Benign	0.61	T;T
Polyphen		0.0010	B;.
Vest4		0.32
MutPred		0.46		Loss of phosphorylation at S104 (P = 0.1572);Loss of phosphorylation at S104 (P = 0.1572);
MVP		0.48
MPC		0.28
ClinPred		0.22	T
GERP RS		3.9
Varity_R		0.088
gMVP		0.47

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs375028675; hg19: chr6-7558382;