6-56631385-A-G

Position:

• chr6-56631385-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The ENST00000370765.11(DST):​c.2357T>C​(p.Leu786Pro) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,338 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. L786I) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: DST ENST00000370765.11 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 6.67

Genes affected

DST (HGNC:1090): (dystonin) This gene encodes a member of the plakin protein family of adhesion junction plaque proteins. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene, but the full-length nature of some variants has not been defined. It has been reported that some isoforms are expressed in neural and muscle tissue, anchoring neural intermediate filaments to the actin cytoskeleton, and some isoforms are expressed in epithelial tissue, anchoring keratin-containing intermediate filaments to hemidesmosomes. Consistent with the expression, mice defective for this gene show skin blistering and neurodegeneration. [provided by RefSeq, Mar 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DST	NM_001374736.1	c.3968T>C	p.Leu1323Pro	missense_variant	30/104	ENST00000680361.1	NP_001361665.1
DST	NM_001723.7	c.2357T>C	p.Leu786Pro	missense_variant	16/24	ENST00000370765.11	NP_001714.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DST	ENST00000680361.1	c.3968T>C	p.Leu1323Pro	missense_variant	30/104		NM_001374736.1	ENSP00000505098
DST	ENST00000370765.11	c.2357T>C	p.Leu786Pro	missense_variant	16/24	1	NM_001723.7	ENSP00000359801

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000399 AC: 1 AN: 250756 Hom.: 0 AF XY: 0.00000738 AC XY: 1 AN XY: 135574

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000882

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461338 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 726976

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000312 Hom.: 0

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary sensory and autonomic neuropathy type 6;C3809470:Epidermolysis bullosa simplex 3, localized or generalized intermediate, with BP230 deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 17, 2018

In summary, this variant is a rare missense change with uncertain impact on protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. 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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies. This variant is present in population databases (rs763647005, ExAC 0.002%) but has not been reported in the literature in individuals with a DST-related disease. This sequence change replaces leucine with proline at codon 786 of the DST protein (p.Leu786Pro). The leucine residue is highly conserved and there is a moderate physicochemical difference between leucine and proline. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Mayo Clinic Laboratories, Mayo Clinic

Nov 03, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.21
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.20	.;.;.;.;T;.;T;.;T
Eigen	Uncertain	0.62
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.93	D;D;D;D;D;D;D;D;D
M_CAP	Benign	0.028	D
MetaRNN	Uncertain	0.70	D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.40	T
MutationAssessor	Uncertain	2.2	.;.;.;M;.;.;.;.;.
PrimateAI	Uncertain	0.73	T
PROVEAN	Uncertain	-4.2	D;D;.;D;D;D;D;D;D
REVEL	Uncertain	0.32
Sift	Benign	0.031	D;D;.;D;D;D;D;D;D
Sift4G	Uncertain	0.0060	.;.;.;.;.;D;D;D;D
Polyphen		0.93	P;.;.;.;.;D;.;D;D
Vest4		0.69
MVP		0.78
MPC		0.69
ClinPred		0.97	D
GERP RS		5.6
gMVP		0.63

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: rs763647005; hg19: chr6-56496183;