2-219418464-T-C

Variant names:

• chr2-219418464-T-C
• NM_001927.4:c.2T>C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001927.4(DES):​c.2T>C​(p.Met1?) variant causes a start lost change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: DES NM_001927.4 start_lost
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 6.05

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 Pathogenic. Variant got 12 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 43 pathogenic variants. Next in-frame start position is after 786 CDS bases. Genomic position: 219420545. Lost 0.556 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-219418464-T-C is Pathogenic according to our data. Variant chr2-219418464-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1066470.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DES	NM_001927.4	c.2T>C	p.Met1?	start_lost	Exon 1 of 9	ENST00000373960.4	NP_001918.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DES	ENST00000373960.4	c.2T>C	p.Met1?	start_lost	Exon 1 of 9	1	NM_001927.4	ENSP00000363071.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1438084 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 715520

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Desmin-related myofibrillar myopathy Pathogenic:1

Jun 29, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. This variant disrupts the initiator methionine in DES. If translation initiates from the next-in-frame methionine, the DES protein would no longer include the region containing p.Ser12 amino acid residue. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 20696008, Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. This variant has not been reported in the literature in individuals with DES-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change affects the initiator methionine of the DES mRNA. The next in-frame methionine is located at codon 263. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.29
CADD	Uncertain	24
DANN	Uncertain	0.97
DEOGEN2	Benign	0.10	T
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.97	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.51	D
PROVEAN	Benign	-0.49	N
REVEL	Pathogenic	0.72
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.0030	D
Polyphen		0.93	P
Vest4		0.95
MutPred		0.97		Gain of phosphorylation at M1 (P = 0.0471);
MVP		0.96
ClinPred		0.99	D
GERP RS		5.1
Varity_R		0.63
gMVP		0.47

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-220283186;