rs973569441

Positions:

• chr6-7581090-C-T

Variant summary

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

The NM_004415.4(DSP):​c.4900C>T​(p.Arg1634Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000274 in 1,461,762 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000027 (0 hom.)
• Consequence: DSP NM_004415.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 2.06

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.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DSP	NM_004415.4	c.4900C>T	p.Arg1634Trp	missense_variant	23/24	ENST00000379802.8	NP_004406.2
DSP	NM_001319034.2	c.4050+850C>T		intron_variant			NP_001305963.1
DSP	NM_001008844.3	c.3582+1318C>T		intron_variant			NP_001008844.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DSP	ENST00000379802.8	c.4900C>T	p.Arg1634Trp	missense_variant	23/24	1	NM_004415.4	ENSP00000369129.3
DSP	ENST00000418664.2	c.3582+1318C>T		intron_variant		1		ENSP00000396591.2
DSP	ENST00000710359.1	c.4050+850C>T		intron_variant				ENSP00000518230.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000274 AC: 40 AN: 1461762 Hom.: 0 Cov.: 32 AF XY: 0.0000248 AC XY: 18 AN XY: 727182

Gnomad4 AFR exome AF: 0.0000299

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: 0.0000351

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

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

Apr 16, 2022

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 1634 of the DSP protein (p.Arg1634Trp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with DSP-related conditions. ClinVar contains an entry for this variant (Variation ID: 534308). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Dec 04, 2023

This missense variant replaces arginine with tryptophan at codon 1634 of the DSP protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with DSP-related disorders in the literature. This variant has not been identified 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. -

Woolly hair-skin fragility syndrome;C1843896:Arrhythmogenic right ventricular dysplasia 8;C1852127:Keratosis palmoplantaris striata 2;C1854063:Arrhythmogenic cardiomyopathy with wooly hair and keratoderma;C1864826:Lethal acantholytic epidermolysis bullosa;C4014393:Cardiomyopathy, dilated, with wooly hair, keratoderma, and tooth agenesis Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Sep 21, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	0.0013	T
BayesDel_noAF	Benign	-0.24
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.42	T
Eigen	Uncertain	0.31
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.058	D
MetaRNN	Uncertain	0.68	D
MetaSVM	Benign	-0.62	T
MutationAssessor	Benign	1.6	L
PrimateAI	Uncertain	0.49	T
PROVEAN	Uncertain	-2.6	D
REVEL	Uncertain	0.37
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.022	D
Polyphen		1.0	D
Vest4		0.62
MVP		0.38
MPC		0.55
ClinPred		0.92	D
GERP RS		4.0
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		2.8
Varity_R		0.24
gMVP		0.42

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: rs973569441; hg19: chr6-7581323;