6-7581163-C-T

Variant names:

• chr6-7581163-C-T
• rs202084959
• NM_004415.4:c.4973C>T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM1

The NM_004415.4(DSP):​c.4973C>T​(p.Ser1658Phe) variant causes a missense change. The variant allele was found at a frequency of 0.00000752 in 1,461,852 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000075 (0 hom.)
• Consequence: DSP NM_004415.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7 B:1
• Conservation: PhyloP100: 4.39

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 2 ACMG points.

• PM1: In a modified_residue Phosphoserine (size 0) in uniprot entity DESP_HUMAN

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DSP	NM_004415.4	c.4973C>T	p.Ser1658Phe	missense_variant	Exon 23 of 24	ENST00000379802.8	NP_004406.2
DSP	NM_001319034.2	c.4050+923C>T		intron_variant	Intron 23 of 23		NP_001305963.1
DSP	NM_001008844.3	c.3582+1391C>T		intron_variant	Intron 23 of 23		NP_001008844.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DSP	ENST00000379802.8	c.4973C>T	p.Ser1658Phe	missense_variant	Exon 23 of 24	1	NM_004415.4	ENSP00000369129.3
DSP	ENST00000418664.2	c.3582+1391C>T		intron_variant	Intron 23 of 23	1		ENSP00000396591.2
DSP	ENST00000710359.1	c.4050+923C>T		intron_variant	Intron 23 of 23			ENSP00000518230.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000399 AC: 1 AN: 250690 Hom.: 0 AF XY: 0.00000737 AC XY: 1 AN XY: 135736

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: 0.00000882

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000752 AC: 11 AN: 1461852 Hom.: 0 Cov.: 32 AF XY: 0.00000825 AC XY: 6 AN XY: 727232

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: 0.00000989

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2

Jun 24, 2013

Biesecker Lab/Clinical Genomics Section, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

- -

Nov 03, 2021

AiLife Diagnostics, AiLife Diagnostics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified Uncertain:1

Dec 04, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: DSP c.4973C>T (p.Ser1658Phe) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4e-06 in 250690 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.4973C>T has been reported in the literature in at least one individual affected with arrhythmogenic right ventricular cardiomyopathy without evidence for causality (e.g. Rigato_2013). This report does not provide unequivocal conclusions about association of the variant with Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication has been ascertained in the context of this evaluation (PMID: 24070718). ClinVar contains an entry for this variant (Variation ID: 180332). Based on the evidence outlined above, the variant was classified as uncertain significance. -

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

Apr 13, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces serine, which is neutral and polar, with phenylalanine, which is neutral and non-polar, at codon 1658 of the DSP protein (p.Ser1658Phe). This variant is present in population databases (rs202084959, gnomAD 0.0009%). This missense change has been observed in individual(s) with arrhythmogenic right ventricular cardiomyopathy (PMID: 24070718). ClinVar contains an entry for this variant (Variation ID: 180332). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. 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. -

Cardiomyopathy Uncertain:1

Jun 29, 2021

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces serine with phenylalanine at codon 1658 of the DSP protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been performed for this variant. This variant has been reported in an individual affected with arrhythmogenic right ventricular cardiomyopathy and sudden cardiac death (PMID: 24070718). This variant has been identified in 1/250690 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Primary familial hypertrophic cardiomyopathy Uncertain:1

Nov 18, 2013

Blueprint Genetics

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

DSP-related disorder Uncertain:1

Aug 15, 2023

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The DSP c.4973C>T variant is predicted to result in the amino acid substitution p.Ser1658Phe. This variant was reported in the compound heterozygous state in two patients from an arrhythmogenic right ventricular cardiomyopathy (ARVC) cohort (Rigato et al. 2013. PubMed ID: 24070718). In a separate study assessing the pathogenicity and penetrance of various ARVC-related genes, the p.Ser1658Phe was listed as "questioned." (Ye et al. 2019. PubMed ID: 31402444). This variant is reported in 0.00088% of alleles in individuals of European (Non-Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/variant/6-7581396-C-T). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Cardiovascular phenotype Benign:1

Nov 27, 2024

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Benign	-0.088	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	22
DANN	Benign	0.96
DEOGEN2	Benign	0.27	T
Eigen	Benign	-0.34
Eigen_PC	Benign	-0.28
FATHMM_MKL	Benign	0.72	D
LIST_S2	Benign	0.78	T
M_CAP	Pathogenic	0.45	D
MetaRNN	Uncertain	0.71	D
MetaSVM	Benign	-0.88	T
MutationAssessor	Benign	0.81	L
PrimateAI	Uncertain	0.48	T
PROVEAN	Benign	-2.3	N
REVEL	Pathogenic	0.70
Sift	Uncertain	0.028	D
Sift4G	Uncertain	0.026	D
Polyphen		0.41	B
Vest4		0.73
MutPred		0.21		Loss of phosphorylation at S1658 (P = 0.0013);
MVP		0.47
MPC		0.31
ClinPred		0.19	T
GERP RS		5.9
Varity_R		0.097
gMVP		0.15

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: rs202084959; hg19: chr6-7581396;