rs928167721

Variant names:

• chr6-7580839-C-G
• rs928167721
• NM_004415.4:c.4649C>G

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BP4_Strong

The NM_004415.4(DSP):​c.4649C>G​(p.Thr1550Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000479 in 1,461,838 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: DSP NM_004415.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.00300

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 -4 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.023439616).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DSP	NM_004415.4	c.4649C>G	p.Thr1550Ser	missense_variant	Exon 23 of 24	ENST00000379802.8	NP_004406.2
DSP	NM_001319034.2	c.4050+599C>G		intron_variant	Intron 23 of 23		NP_001305963.1
DSP	NM_001008844.3	c.3582+1067C>G		intron_variant	Intron 23 of 23		NP_001008844.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DSP	ENST00000379802.8	c.4649C>G	p.Thr1550Ser	missense_variant	Exon 23 of 24	1	NM_004415.4	ENSP00000369129.3
DSP	ENST00000418664.2	c.3582+1067C>G		intron_variant	Intron 23 of 23	1		ENSP00000396591.2
DSP	ENST00000710359.1	c.4050+599C>G		intron_variant	Intron 23 of 23			ENSP00000518230.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461838 Hom.: 0 Cov.: 32 AF XY: 0.00000688 AC XY: 5 AN XY: 727212

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: 0.00000629

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Arrhythmogenic right ventricular dysplasia 8;C1854063:Arrhythmogenic cardiomyopathy with wooly hair and keratoderma Uncertain:1

Mar 12, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with serine at codon 1550 of the DSP protein (p.Thr1550Ser). The threonine residue is moderately conserved and there is a small physicochemical difference between threonine and serine. This variant has not been reported in the literature in individuals with DSP-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The serine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.081
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.59
CADD	Benign	2.5
DANN	Benign	0.55
DEOGEN2	Benign	0.12	T
Eigen	Benign	-0.84
Eigen_PC	Benign	-0.71
FATHMM_MKL	Benign	0.26	N
LIST_S2	Benign	0.48	T
M_CAP	Benign	0.0051	T
MetaRNN	Benign	0.023	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.2	L
PrimateAI	Benign	0.31	T
PROVEAN	Benign	0.41	N
REVEL	Benign	0.15
Sift	Benign	0.75	T
Sift4G	Benign	0.84	T
Polyphen		0.0	B
Vest4		0.075
MutPred		0.10		Gain of MoRF binding (P = 0.1298);
MVP		0.20
MPC		0.19
ClinPred		0.033	T
GERP RS		2.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.032
gMVP		0.042

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: rs928167721; hg19: chr6-7581072;