rs748738880

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PVS1_ModeratePM2

The NM_004415.4(DSP):c.2T>G(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000133 in 150,002 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

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

Exomes 𝑓: 0.000041 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

DSP
NM_004415.4 start_lost

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 2.55

Publications

1 publications found

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:

DSP-AS1 (HGNC:56039): (DSP antisense RNA 1)

DSP-AS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PVS1

Start lost variant, next in-frame start position is after 1 pathogenic variants. Next in-frame start position is after 17 codons. Genomic position: 7541964. Lost 0.006 part of the original CDS.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DSP	NM_004415.4 link	c.2T>G	p.Met1?	start_lost	Exon 1 of 24	ENST00000379802.8	NP_004406.2	P15924-1B4DKX6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DSP	ENST00000379802.8 link	c.2T>G	p.Met1?	start_lost	Exon 1 of 24	1	NM_004415.4	ENSP00000369129.3		P15924-1

Frequencies

GnomAD3 genomes

AF:

0.0000133

AC:

AN:

150002

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:

0.0000296

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000857

AC:

AN:

233270

AF XY:

0.00000779

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000195

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000405

AC:

AN:

1455058

Hom.:

Cov.:

AF XY:

0.0000442

AC XY:

AN XY:

723614

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000300

AC:

AN:

33304

American (AMR)

AF:

0.00

AC:

AN:

44284

Ashkenazi Jewish (ASJ)

AF:

0.0000384

AC:

AN:

26024

East Asian (EAS)

AF:

0.00

AC:

AN:

39532

South Asian (SAS)

AF:

0.00

AC:

AN:

85522

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51416

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5688

European-Non Finnish (NFE)

AF:

0.0000505

AC:

AN:

1109192

Other (OTH)

AF:

0.0000166

AC:

AN:

60096

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.310

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000133

AC:

AN:

150002

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73250

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

40486

American (AMR)

AF:

0.00

AC:

AN:

15074

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3464

East Asian (EAS)

AF:

0.00

AC:

AN:

5008

South Asian (SAS)

AF:

0.00

AC:

AN:

4754

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10448

Middle Eastern (MID)

AF:

0.00

AC:

AN:

310

European-Non Finnish (NFE)

AF:

0.0000296

AC:

AN:

67496

Other (OTH)

AF:

0.00

AC:

AN:

2064

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000866

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.00000830

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 04, 2022

Mendelics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Arrhythmogenic cardiomyopathy with wooly hair and keratoderma

Uncertain:1

Dec 13, 2023

All of Us Research Program, National Institutes of Health

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant results in the loss of the translation initiation codon methionine (p.Met1?) of the DSP gene. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in an individual dilated cardiomyopathy or arrhythmogenic right ventricular cardiomyopathy (PMID: 31317183). This variant has been identified in 2/233270 chromosomes in the general population by the Genome Aggregation Database (gnomAD). While loss of DSP function is a known mechanism of disease, one cannot rule out the possibility that downstream in-frame methionine (e.g., p.Met17) may be used for alternate protein translation initiation and lead to the production of functional protein. 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. -

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

Uncertain:1

Oct 01, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change affects the initiator methionine of the DSP mRNA. The next in-frame methionine is located at codon 17. This variant is present in population databases (rs748738880, gnomAD 0.002%). Disruption of the initiator codon has been observed in individual(s) with clinical features of DSP-related conditions (PMID: 31317183). ClinVar contains an entry for this variant (Variation ID: 429571). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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 13, 2023

Color Diagnostics, LLC DBA Color Health

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant results in the loss of the translation initiation codon methionine (p.Met1?) of the DSP gene. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in an individual dilated cardiomyopathy or arrhythmogenic right ventricular cardiomyopathy (PMID: 31317183). This variant has been identified in 2/233270 chromosomes in the general population by the Genome Aggregation Database (gnomAD). While loss of DSP function is a known mechanism of disease, one cannot rule out the possibility that a downstream in-frame methionine may be used for alternate protein translation initiation and lead to the production of functional protein. 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. -

not provided

Uncertain:1

Aug 17, 2022

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Reported previously by whole-exome sequencing in 1 of 61,019 individuals in the DiscovEHR cohort, with no indication of cardiomyopathy from the electronic health record of that individual (Carruth et al., 2019); Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 31638835) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Uncertain

0.050

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.44

T;.

Eigen

Uncertain

0.26

Eigen_PC

Uncertain

0.26

FATHMM_MKL

Benign

0.47

LIST_S2

Uncertain

0.90

D;D

M_CAP

Pathogenic

0.99

MetaRNN

Pathogenic

0.99

D;D

MetaSVM

Benign

-0.37

PhyloP100

2.5

PROVEAN

Benign

-2.4

N;D

REVEL

Uncertain

0.61

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

0.86

P;.

Vest4

0.81

MutPred

0.99

Gain of MoRF binding (P = 0.0064);Gain of MoRF binding (P = 0.0064);

MVP

0.87

ClinPred

0.96

GERP RS

3.9

PromoterAI

-0.16

Neutral

(source)

Varity_R

0.95

gMVP

0.91

Mutation Taster

=19/181

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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rs748738880

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over