chr2-219425962-CC-AG

Variant names:

• chr2-219425962-CC-AG
• rs1060503170
• NM_001927.4:c.1385_1386delCCinsAG

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_001927.4(DES):​c.1385_1386delCCinsAG​(p.Ala462Glu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.42

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]

ENSG00000234638 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a region_of_interest Tail (size 57) in uniprot entity DESM_HUMAN there are 27 pathogenic changes around while only 2 benign (93%) in NM_001927.4
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DES	NM_001927.4	c.1385_1386delCCinsAG	p.Ala462Glu	missense_variant		ENST00000373960.4	NP_001918.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DES	ENST00000373960.4	c.1385_1386delCCinsAG	p.Ala462Glu	missense_variant		1	NM_001927.4	ENSP00000363071.3

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Desmin-related myofibrillar myopathy Uncertain:1

Nov 02, 2016

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, this variant is a novel missense change with uncertain impact on protein function. 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 do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class 0"). This variant is present in population databases (rs1135931, ExAC <0.01%) but has not been reported in the literature in individuals with a DES-related disease. This sequence change replaces alanine with glutamine at codon 462 of the DES protein (p.Ala462Glu). The alanine residue is highly conserved and there is a moderate physicochemical difference between alanine and glutamine. -

not provided Uncertain:1

Jun 11, 2019

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Has not been previously published as pathogenic or benign to our knowledge; Not observed at a significant frequency in large population cohorts (Lek et al., 2016); Reported as a variant of uncertain significance in ClinVar but additional evidence is not available (ClinVar Variant ID#411144; Landrum et al., 2016); Deletion of two nucleotides and insertion of two nucleotides that results in the in frame substitution of one amino acid residue; in silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function -

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: rs1060503170; hg19: chr2-220290684;