2-219418870-C-T

Position:

• chr2-219418870-C-T

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 0P and 19B. BP4_Moderate BP6_Very_Strong BP7 BS1 BS2

The NM_001927.4(DES):​c.408C>T​(p.Leu136=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0314 in 1,573,926 control chromosomes in the GnomAD database, including 938 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. L136L) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.026 (76 hom., cov: 33)
  • Exomes 𝑓: 0.032 (862 hom.)
• Consequence: DES NM_001927.4 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:18
• Conservation: PhyloP100: 0.728

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 Benign. Variant got -19 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.34).
• BP6: Variant 2-219418870-C-T is Benign according to our data. Variant chr2-219418870-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 44262.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-219418870-C-T is described in Lovd as [Benign]. Variant chr2-219418870-C-T is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=0.728 with no splicing effect.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.026 (3956/152292) while in subpopulation NFE AF= 0.0389 (2642/67998). AF 95% confidence interval is 0.0376. There are 76 homozygotes in gnomad4. There are 1911 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 76 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DES	NM_001927.4	c.408C>T	p.Leu136=	synonymous_variant	1/9	ENST00000373960.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DES	ENST00000373960.4	c.408C>T	p.Leu136=	synonymous_variant	1/9	1	NM_001927.4	P1

Frequencies

GnomAD3 genomes AF: 0.0260 AC: 3958 AN: 152176 Hom.: 76 Cov.: 33

Gnomad AFR AF: 0.00615

Gnomad AMI AF: 0.0220

Gnomad AMR AF: 0.0232

Gnomad ASJ AF: 0.0374

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00290

Gnomad FIN AF: 0.0449

Gnomad MID AF: 0.0190

Gnomad NFE AF: 0.0388

Gnomad OTH AF: 0.0282

GnomAD3 exomes AF: 0.0266 AC: 4829 AN: 181540 Hom.: 92 AF XY: 0.0262 AC XY: 2558 AN XY: 97508

Gnomad AFR exome AF: 0.00558

Gnomad AMR exome AF: 0.0197

Gnomad ASJ exome AF: 0.0327

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00499

Gnomad FIN exome AF: 0.0445

Gnomad NFE exome AF: 0.0387

Gnomad OTH exome AF: 0.0323

GnomAD4 exome AF: 0.0320 AC: 45538 AN: 1421634 Hom.: 862 Cov.: 92 AF XY: 0.0314 AC XY: 22113 AN XY: 703480

Gnomad4 AFR exome AF: 0.00511

Gnomad4 AMR exome AF: 0.0207

Gnomad4 ASJ exome AF: 0.0347

Gnomad4 EAS exome AF: 0.0000266

Gnomad4 SAS exome AF: 0.00483

Gnomad4 FIN exome AF: 0.0452

Gnomad4 NFE exome AF: 0.0359

Gnomad4 OTH exome AF: 0.0283

GnomAD4 genome AF: 0.0260 AC: 3956 AN: 152292 Hom.: 76 Cov.: 33 AF XY: 0.0257 AC XY: 1911 AN XY: 74456

Gnomad4 AFR AF: 0.00611

Gnomad4 AMR AF: 0.0231

Gnomad4 ASJ AF: 0.0374

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00290

Gnomad4 FIN AF: 0.0449

Gnomad4 NFE AF: 0.0389

Gnomad4 OTH AF: 0.0279

Alfa AF: 0.0337 Hom.: 45

Bravo AF: 0.0239

Asia WGS AF: 0.00173 AC: 6 AN: 3476

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:18

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:10

Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Likely benign, no assertion criteria provided	clinical testing	Genetic Services Laboratory, University of Chicago	-	Likely benign based on allele frequency in 1000 Genomes Project or ESP global frequency and its presence in a patient with a rare or unrelated disease phenotype. NOT Sanger confirmed. -
Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jan 30, 2014	- -
Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jun 05, 2009	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Aug 02, 2017	- -

Desmin-related myofibrillar myopathy Benign:2

Benign, criteria provided, single submitter	clinical testing	Invitae	Feb 01, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2015	- -
Likely benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -

Myofibrillar Myopathy, Dominant Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Dilated cardiomyopathy 1I Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Neurogenic scapuloperoneal syndrome, Kaeser type Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Cardiovascular phenotype Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 29, 2015

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.34
CADD	Benign	12
DANN	Benign	0.97

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs111828114; hg19: chr2-220283592; COSMIC: COSV64660176; COSMIC: COSV64660176;