2-219420145-C-T

Position:

• chr2-219420145-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001927.4(DES):​c.629C>T​(p.Ala210Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: DES NM_001927.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.25

Genes affected

DES (HGNC:2770): (desmin) This gene encodes a muscle-specific class III intermediate filament. Homopolymers of this protein form a stable intracytoplasmic filamentous network connecting myofibrils to each other and to the plasma membrane. Mutations in this gene are associated with desmin-related myopathy, a familial cardiac and skeletal myopathy (CSM), and with distal myopathies. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.34886444).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DES	NM_001927.4	c.629C>T	p.Ala210Val	missense_variant	2/9	ENST00000373960.4	NP_001918.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DES	ENST00000373960.4	c.629C>T	p.Ala210Val	missense_variant	2/9	1	NM_001927.4	ENSP00000363071	P1
DES	ENST00000477226.6	n.103C>T		non_coding_transcript_exon_variant	1/8	4
DES	ENST00000492726.1	n.24C>T		non_coding_transcript_exon_variant	1/6	4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Desmin-related myofibrillar myopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 30, 2016

This sequence change replaces alanine with valine at codon 210 of the DES protein (p.Ala210Val). The alanine residue is highly conserved and there is a small physicochemical difference between alanine and valine. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a DES-related disease. 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 tolerated, but these predictions have not been confirmed by published functional studies. In summary, this variant is a novel missense change that is not predicted to affect 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
CardioboostCm	Benign	0.0075
BayesDel_addAF	Uncertain	0.042	T
BayesDel_noAF	Benign	-0.18
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.53	D
Eigen	Benign	-0.092
Eigen_PC	Benign	0.038
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.91	D
M_CAP	Benign	0.027	D
MetaRNN	Benign	0.35	T
MetaSVM	Benign	-0.41	T
MutationAssessor	Benign	0.53	N
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	-2.1	N
REVEL	Uncertain	0.36
Sift	Benign	0.056	T
Sift4G	Benign	0.081	T
Polyphen		0.12	B
Vest4		0.39
MutPred		0.56		Loss of disorder (P = 0.0517);
MVP		0.89
MPC		0.0087
ClinPred		0.65	D
GERP RS		3.7
Varity_R		0.26
gMVP		0.64

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: rs1060503169; hg19: chr2-220284867; COSMIC: COSV64659761; COSMIC: COSV64659761;