6-7574781-C-T

Position:

chr6-7574781-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 0P and 3B. BP4_ModerateBP6

The NM_004415.4(DSP):c.2422C>T(p.Arg808Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000245 in 1,614,152 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R808H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00025 ( 1 hom. )

Consequence

DSP
NM_004415.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7B:5

Conservation

PhyloP100: 1.83

Variant links:

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]

DSP links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.18613857).

BP6

Variant 6-7574781-C-T is Benign according to our data. Variant chr6-7574781-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 44874.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=5, Uncertain_significance=6}. Variant chr6-7574781-C-T is described in Lovd as [Likely_benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
DSP	NM_004415.4 linkuse as main transcript	c.2422C>T	p.Arg808Cys	missense_variant	17/24	ENST00000379802.8
DSP	NM_001319034.2 linkuse as main transcript	c.2422C>T	p.Arg808Cys	missense_variant	17/24
DSP	NM_001008844.3 linkuse as main transcript	c.2422C>T	p.Arg808Cys	missense_variant	17/24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DSP	ENST00000379802.8 linkuse as main transcript	c.2422C>T	p.Arg808Cys	missense_variant	17/24	1	NM_004415.4	P2	P15924-1
DSP	ENST00000418664.2 linkuse as main transcript	c.2422C>T	p.Arg808Cys	missense_variant	17/24	1		A2	P15924-2
DSP	ENST00000710359.1 linkuse as main transcript	c.2422C>T	p.Arg808Cys	missense_variant	17/24			A2
DSP	ENST00000684395.1 linkuse as main transcript	n.1063C>T		non_coding_transcript_exon_variant	4/5

Frequencies

GnomAD3 genomes

AF:

0.000197

AC:

AN:

152176

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00289

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000265

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000302

AC:

AN:

251444

Hom.:

AF XY:

0.000302

AC XY:

AN XY:

135890

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00318

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.0000980

Gnomad FIN exome

AF:

0.0000924

Gnomad NFE exome

AF:

0.000317

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000250

AC:

366

AN:

1461858

Hom.:

Cov.:

AF XY:

0.000261

AC XY:

190

AN XY:

727232

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00310

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000927

Gnomad4 FIN exome

AF:

0.000112

Gnomad4 NFE exome

AF:

0.000226

Gnomad4 OTH exome

AF:

0.000315

GnomAD4 genome

AF:

0.000197

AC:

AN:

152294

Hom.:

Cov.:

AF XY:

0.000242

AC XY:

AN XY:

74484

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00289

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000265

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000328

Hom.:

Bravo

AF:

0.000170

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000371

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Arrhythmogenic right ventricular cardiomyopathy

Uncertain:2

Uncertain significance, criteria provided, single submitter	research	Biesecker Lab/Clinical Genomics Section, National Institutes of Health	Apr 05, 2018	- -
Uncertain significance, no assertion criteria provided	research	CSER _CC_NCGL, University of Washington	Jun 01, 2014	- -

Cardiomyopathy

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jun 27, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Dec 05, 2017	- -

not specified

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Nov 09, 2021	The p.Arg808Cys variant in DSP has been reported in 6 individuals: 1 with DCM, 2 with HCM, 1 with LVH, and 3 with ARVC (Lopes 2015, Ng 2013, Al-Jassar 2011, Marschall 2019 PMID: 31737537, http://arvcdatabase.info/, LMM unpublished data). However, this variant has also been identified in 0.3% (32/10368) of Ashkenazi Jewish chromosomes and 0.028% (37/129158) European chromosomes, including 1 homozygous individual, by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org/). This variant is reported in ClinVar (Variation ID: 44874). Computational prediction tools and conservation analyses do not provide strong support for or against an impact to the protein. In summary, the frequency of this variant suggests that it is more likely to be benign. ACMG/AMP Criteria applied: BS1. -
Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Apr 09, 2024	Variant summary: DSP c.2422C>T (p.Arg808Cys) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0003 in 251444 control chromosomes in the gnomAD database, including 1 homozygotes. The observed variant frequency is approximately 2 fold of the estimated maximal expected allele frequency for a pathogenic variant in DSP causing Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy phenotype (0.0002), strongly suggesting that the variant is benign. c.2422C>T has been reported in the literature in individuals affected with Cardiomyopathy without evidence for causality. These report(s) do 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 publications have been ascertained in the context of this evaluation (PMID: 25163546, 23396983). ClinVar contains an entry for this variant (Variation ID: 44874). Based on the evidence outlined above, the variant was classified as likely benign. -

Lethal acantholytic epidermolysis bullosa

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 19, 2018

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Woolly hair-skin fragility syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 19, 2018

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Jan 01, 2017

- -

Arrhythmogenic right ventricular dysplasia 8

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 19, 2018

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

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 19, 2024

- -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 28, 2022

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

0.24

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Pathogenic

0.24

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.43

T;.

Eigen

Benign

0.088

Eigen_PC

Uncertain

0.27

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.97

D;D

M_CAP

Benign

0.073

MetaRNN

Benign

0.19

T;T

MetaSVM

Benign

-0.53

MutationAssessor

Benign

1.5

L;L

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.71

PROVEAN

Uncertain

-3.6

D;D

REVEL

Uncertain

0.48

Sift

Benign

0.11

T;T

Sift4G

Benign

0.062

T;T

Polyphen

0.48

P;.

Vest4

0.81

MVP

0.96

MPC

0.96

ClinPred

0.14

GERP RS

5.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.20

gMVP

0.44

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over