6-7585562-C-G

Position:

• chr6-7585562-C-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_004415.4(DSP):​c.8300C>G​(p.Thr2767Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000041 in 1,461,876 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T2767I) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: DSP NM_004415.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.556

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 Likely_benign. Variant got -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.2368449).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DSP	NM_004415.4	c.8300C>G	p.Thr2767Ser	missense_variant	24/24	ENST00000379802.8
DSP	NM_001319034.2	c.6971C>G	p.Thr2324Ser	missense_variant	24/24
DSP	NM_001008844.3	c.6503C>G	p.Thr2168Ser	missense_variant	24/24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DSP	ENST00000379802.8	c.8300C>G	p.Thr2767Ser	missense_variant	24/24	1	NM_004415.4	P2
DSP	ENST00000418664.2	c.6503C>G	p.Thr2168Ser	missense_variant	24/24	1		A2
DSP	ENST00000710359.1	c.6971C>G	p.Thr2324Ser	missense_variant	24/24			A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461876 Hom.: 0 Cov.: 37 AF XY: 0.00000550 AC XY: 4 AN XY: 727238

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

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

Oct 19, 2022

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. 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: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with DSP-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces threonine, which is neutral and polar, with serine, which is neutral and polar, at codon 2767 of the DSP protein (p.Thr2767Ser). -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 26, 2023

The p.T2767S variant (also known as c.8300C>G), located in coding exon 24 of the DSP gene, results from a C to G substitution at nucleotide position 8300. The threonine at codon 2767 is replaced by serine, an amino acid with similar properties. This alteration has been reported in a pediatric cardiomyopathy cohort; however, clinical details were limited and additional alterations in other cardiac-related genes were identified (Herkert JC et al. Genet Med, 2018 Nov;20:1374-1386). This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.091
BayesDel_addAF	Benign	-0.071	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	14
DANN	Uncertain	0.98
DEOGEN2	Benign	0.32	T;.
Eigen	Benign	-0.21
Eigen_PC	Benign	-0.21
FATHMM_MKL	Benign	0.68	D
LIST_S2	Benign	0.82	T;T
M_CAP	Benign	0.032	D
MetaRNN	Benign	0.24	T;T
MetaSVM	Benign	-0.87	T
MutationAssessor	Benign	1.6	L;.
MutationTaster	Benign	0.96	N;N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-2.0	N;N
REVEL	Benign	0.12
Sift	Benign	0.035	D;D
Sift4G	Uncertain	0.020	D;D
Polyphen		0.21	B;.
Vest4		0.21
MutPred		0.25		Gain of disorder (P = 0.0456);.;
MVP		0.59
MPC		0.22
ClinPred		0.89	D
GERP RS		2.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.14
gMVP		0.25

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: rs34884895; hg19: chr6-7585795;