6-7571910-AACAGAGAAAATG-A

Position:

• chr6-7571910-AACAGAGAAAATG-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM4

The NM_004415.4(DSP):​c.1976_1987del​(p.Arg659_Asp662del) variant causes a inframe deletion change. The variant allele was found at a frequency of 0.000000684 in 1,461,866 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: 6.8e-7 (0 hom.)
• Consequence: DSP NM_004415.4 inframe_deletion
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 6.08

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 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_004415.4.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DSP	NM_004415.4	c.1976_1987del	p.Arg659_Asp662del	inframe_deletion	15/24	ENST00000379802.8	NP_004406.2
DSP	NM_001008844.3	c.1976_1987del	p.Arg659_Asp662del	inframe_deletion	15/24		NP_001008844.1
DSP	NM_001319034.2	c.1976_1987del	p.Arg659_Asp662del	inframe_deletion	15/24		NP_001305963.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DSP	ENST00000379802.8	c.1976_1987del	p.Arg659_Asp662del	inframe_deletion	15/24	1	NM_004415.4	ENSP00000369129	P2
DSP	ENST00000418664.2	c.1976_1987del	p.Arg659_Asp662del	inframe_deletion	15/24	1		ENSP00000396591	A2
DSP	ENST00000710359.1	c.1976_1987del	p.Arg659_Asp662del	inframe_deletion	15/24			ENSP00000518230	A2
DSP	ENST00000684395.1	n.617_628del		non_coding_transcript_exon_variant	2/5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461866 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 727238

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

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

Feb 14, 2019

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. Experimental studies and prediction algorithms are not available for this variant, and the functional significance of the deleted amino acids is currently unknown. This variant has not been reported in the literature in individuals with DSP-related disease. This variant is not present in population databases (ExAC no frequency). This variant, c.1976_1987delGAGAAAATGACA, results in the deletion of 4 amino acid(s) of the DSP protein (p.Arg659_Asp662del), but otherwise preserves the integrity of the reading frame. -

Cardiomyopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Jul 11, 2019

This variant causes an in-frame deletion of four amino acids of the DSP protein. To our knowledge, functional assays have not been performed for this variant. Computational splicing tools suggest that this variant may not impact RNA splicing. This variant has not been reported in individuals affected with cardiovascular disorders in the literature. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). 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

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Mar 17, 2023

Not observed at significant frequency in large population cohorts (gnomAD); In-frame deletion of 4 amino acids in a non-repeat region; In silico analysis supports a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1554107128; hg19: chr6-7572143;