rs121918207

Positions:

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2PP3_StrongPP5

The NM_018122.5(DARS2):c.788G>A(p.Arg263Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000223 in 1,613,262 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000023 ( 0 hom. )

Consequence

DARS2
NM_018122.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3U:1O:1

Conservation

PhyloP100: 7.77

Variant links:

Genes affected

DARS2 (HGNC:25538): (aspartyl-tRNA synthetase 2, mitochondrial) The protein encoded by this gene belongs to the class-II aminoacyl-tRNA synthetase family. It is a mitochondrial enzyme that specifically aminoacylates aspartyl-tRNA. Mutations in this gene are associated with leukoencephalopathy with brainstem and spinal cord involvement and lactate elevation (LBSL). [provided by RefSeq, Nov 2009]

DARS2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.977

PP5

Variant 1-173838207-G-A is Pathogenic according to our data. Variant chr1-173838207-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 1060.We mark this variant Likely_pathogenic, oryginal submissions are: {not_provided=1, Pathogenic=1, Likely_pathogenic=1, Uncertain_significance=1}. Variant chr1-173838207-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
DARS2	NM_018122.5 linkuse as main transcript	c.788G>A	p.Arg263Gln	missense_variant	9/17	ENST00000649689.2
DARS2	NM_001365212.1 linkuse as main transcript	c.788G>A	p.Arg263Gln	missense_variant	9/16
DARS2	NM_001365213.2 linkuse as main transcript	c.788G>A	p.Arg263Gln	missense_variant	9/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DARS2	ENST00000649689.2 linkuse as main transcript	c.788G>A	p.Arg263Gln	missense_variant	9/17		NM_018122.5	P1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152138

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000278

AC:

AN:

251390

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135876

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000352

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000226

AC:

AN:

1461124

Hom.:

Cov.:

AF XY:

0.0000275

AC XY:

AN XY:

726904

show subpopulations

Gnomad4 AFR exome

AF:

0.0000598

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000696

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000189

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152138

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74306

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000322

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3Uncertain:1Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Leukoencephalopathy with brain stem and spinal cord involvement-high lactate syndrome

Pathogenic:2Other:1

Pathogenic, no assertion criteria provided	literature only	OMIM	Apr 01, 2007	- -
Pathogenic, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Feb 17, 2016	- -
not provided, no classification provided	phenotyping only	GenomeConnect, ClinGen	-	GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

not provided

Pathogenic:1Uncertain:1

Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 18, 2022	Identified in the published literature in an individual with LBSL, however a second variant was not identified (Scheper et al., 2007); Functional analysis of recombinant mutant protein showed significantly impaired enzymatic activity compared to wildtype protein (Scheper et al., 2007); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25476837, 33574740, 23216004, 26620921, 30006346, 34503567, 29305884, 17384640, Rathore2017[Abstract], 34631948) -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jun 25, 2022	This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 263 of the DARS2 protein (p.Arg263Gln). This variant is present in population databases (rs121918207, gnomAD 0.005%). This missense change has been observed in individual(s) with Leukoencephalopathy (PMID: 17384640). ClinVar contains an entry for this variant (Variation ID: 1060). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt DARS2 protein function. Experimental studies have shown that this missense change affects DARS2 function (PMID: 17384640, 23216004). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.34

BayesDel_addAF

Pathogenic

0.33

BayesDel_noAF

Pathogenic

0.40

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.79

D;.;.;.;D;.;.

Eigen

Pathogenic

0.87

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.99

.;D;D;D;D;D;D

M_CAP

Pathogenic

0.33

MetaRNN

Pathogenic

0.98

D;D;D;D;D;D;D

MetaSVM

Uncertain

0.76

MutationAssessor

Pathogenic

3.6

H;.;.;.;H;.;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.57

PROVEAN

Uncertain

-3.5

D;.;.;.;.;.;.

REVEL

Pathogenic

0.91

Sift

Benign

0.036

D;.;.;.;.;.;.

Sift4G

Uncertain

0.041

D;.;.;.;.;.;.

Polyphen

1.0

D;.;.;.;D;.;.

Vest4

0.95

MutPred

0.91

Loss of MoRF binding (P = 0.07);Loss of MoRF binding (P = 0.07);Loss of MoRF binding (P = 0.07);Loss of MoRF binding (P = 0.07);Loss of MoRF binding (P = 0.07);Loss of MoRF binding (P = 0.07);Loss of MoRF binding (P = 0.07);

MVP

0.97

MPC

0.92

ClinPred

0.99

GERP RS

3.8

Varity_R

0.66

gMVP

0.81

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over