rs774514264

Variant summary

Our verdict is Pathogenic. Variant got 17 ACMG points: 17P and 0B. PVS1PP3PP5_Very_Strong

The NM_004415.4(DSP):c.2436+2T>C variant causes a splice donor change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000867 in 1,614,054 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000082 ( 0 hom. )

Consequence

DSP
NM_004415.4 splice_donor

Scores

Splicing: ADA: 0.9928

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 7.82

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 Pathogenic. Variant got 17 ACMG points.

PVS1

Splicing variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.

PP3

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, max_spliceai. No scorers claiming Uncertain. Scorers claiming Benign: dbscSNV1_RF.

PP5

Variant 6-7574797-T-C is Pathogenic according to our data. Variant chr6-7574797-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 388661.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	MANE
DSP	NM_004415.4 linkuse as main transcript	c.2436+2T>C	splice_donor_variant	ENST00000379802.8
DSP	NM_001008844.3 linkuse as main transcript	c.2436+2T>C	splice_donor_variant
DSP	NM_001319034.2 linkuse as main transcript	c.2436+2T>C	splice_donor_variant

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Appris	UniProt
DSP	ENST00000379802.8 linkuse as main transcript	c.2436+2T>C	splice_donor_variant	1	NM_004415.4	P2	P15924-1
DSP	ENST00000418664.2 linkuse as main transcript	c.2436+2T>C	splice_donor_variant	1		A2	P15924-2
DSP	ENST00000710359.1 linkuse as main transcript	c.2436+2T>C	splice_donor_variant			A2
DSP	ENST00000684395.1 linkuse as main transcript	n.1077+2T>C	splice_donor_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152198

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251420

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135880

show subpopulations

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:

0.00000821

AC:

AN:

1461856

Hom.:

Cov.:

AF XY:

0.00000963

AC XY:

AN XY:

727230

show subpopulations

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:

0.00000899

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152198

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.00000832

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Cardiomyopathy

Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jun 22, 2023	This variant causes a T to C nucleotide substitution at the +2 position of intron 17 of the DSP gene. Splice site prediction tools predict that this variant may have a significant impact on RNA splicing. Although this prediction has not been confirmed in published RNA studies, this variant is expected to result in an absent or disrupted protein product. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in one individual affected with dilated cardiomyopathy (PMID: 29892087), and in several individuals from population-based cohorts whose clinical information were limited (PMID: 31447099, 31589614, 33684294). This variant has been identified in 1/251420 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of DSP function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Likely Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario	Mar 24, 2023	- -

Arrhythmogenic cardiomyopathy with wooly hair and keratoderma

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

All of Us Research Program, National Institutes of Health

Jan 08, 2024

This variant causes a T to C nucleotide substitution at the +2 position of intron 17 of the DSP gene. Splice site prediction tools predict that this variant may have a significant impact on RNA splicing. Although this prediction has not been confirmed in published RNA studies, this variant is expected to result in an absent or disrupted protein product. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in one individual affected with dilated cardiomyopathy (PMID: 29892087), and in several individuals from population-based cohorts whose clinical information were limited (PMID: 31447099, 31589614, 33684294). This variant has been identified in 1/251420 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of DSP function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Likely Pathogenic. -

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

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Invitae

Apr 14, 2023

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. ClinVar contains an entry for this variant (Variation ID: 388661). Disruption of this splice site has been observed in individual(s) with dilated cardiomyopathy (PMID: 29892087). This variant is not present in population databases (gnomAD no frequency). This sequence change affects a donor splice site in intron 17 of the DSP gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in DSP are known to be pathogenic (PMID: 20716751, 24503780, 25227139). -

Arrhythmogenic right ventricular cardiomyopathy

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jan 17, 2019

The c.2436+2T>C variant in DSP has not been previously reported in the literatur e in individuals with cardiomyopathy, but has been reported by other clinical la boratories in ClinVar (Variation ID: 388661). It has also been identified in 1/6 6720 European chromosomes by the Genome Aggregation Database (gnomAD, http://gno mad.broadinstitute.org/; dbSNP rs774514264). This variant occurs in the invarian t region (+/- 1,2) of the splice consensus sequence and is predicted to cause al tered splicing leading to an abnormal or absent protein, which is common among d isease causing DSP variants. In summary, although additional studies are require d to fully establish its clinical significance, the c.2436+2T>C variant is likel y pathogenic. -

not provided

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Apr 06, 2023

Identified in a patient with DCM in published literature, but familial segregation information and additional clinical information were not included (Horvat et al., 2019); Not observed at a significant frequency in large population cohorts (gnomAD); Canonical splice site variant predicted to result in a null allele in a gene for which loss of function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 31447099, 31589614, 31402444, 33684294, 33087929, 29892087) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.42

BayesDel_noAF

Pathogenic

0.37

Cadd

Pathogenic

Dann

Uncertain

1.0

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

1.0

FATHMM_MKL

Pathogenic

1.0

MutationTaster

Benign

1.0

D;D

GERP RS

5.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.2

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

0.99

dbscSNV1_RF

Benign

0.71

SpliceAI score (max)

0.84

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.84

Position offset: -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