1-173825320-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_018122.5(DARS2):c.91A>G(p.Arg31Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000224 in 1,613,796 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000099 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00024 ( 0 hom. )

Consequence

DARS2
NM_018122.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 0.196

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 Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.16013935).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
DARS2	NM_018122.5 linkuse as main transcript	c.91A>G	p.Arg31Gly	missense_variant	1/17	ENST00000649689.2
DARS2	NM_001365212.1 linkuse as main transcript	c.91A>G	p.Arg31Gly	missense_variant	1/16
DARS2	NM_001365213.2 linkuse as main transcript	c.91A>G	p.Arg31Gly	missense_variant	1/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DARS2	ENST00000649689.2 linkuse as main transcript	c.91A>G	p.Arg31Gly	missense_variant	1/17		NM_018122.5	P1

Frequencies

GnomAD3 genomes

AF:

0.0000986

AC:

AN:

152168

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

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:

0.0000943

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000162

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000437

AC:

AN:

251472

Hom.:

AF XY:

0.0000589

AC XY:

AN XY:

135918

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000967

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000237

AC:

347

AN:

1461628

Hom.:

Cov.:

AF XY:

0.000228

AC XY:

166

AN XY:

727130

show subpopulations

Gnomad4 AFR exome

AF:

0.0000598

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:

0.0000937

Gnomad4 NFE exome

AF:

0.000300

Gnomad4 OTH exome

AF:

0.0000994

GnomAD4 genome

AF:

0.0000986

AC:

AN:

152168

Hom.:

Cov.:

AF XY:

0.0000942

AC XY:

AN XY:

74342

show subpopulations

Gnomad4 AFR

AF:

0.0000724

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000943

Gnomad4 NFE

AF:

0.000162

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000161

Hom.:

Bravo

AF:

0.0000831

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Apr 14, 2022	Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Aug 03, 2022	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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 1397631). This variant has not been reported in the literature in individuals affected with DARS2-related conditions. This variant is present in population databases (rs140881109, gnomAD 0.009%). This sequence change replaces arginine, which is basic and polar, with glycine, which is neutral and non-polar, at codon 31 of the DARS2 protein (p.Arg31Gly). -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 17, 2021

The c.91A>G (p.R31G) alteration is located in exon 1 (coding exon 1) of the DARS2 gene. This alteration results from a A to G substitution at nucleotide position 91, causing the arginine (R) at amino acid position 31 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Apr 11, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.082

BayesDel_addAF

Benign

-0.090

BayesDel_noAF

Benign

-0.17

Cadd

Benign

Dann

Uncertain

1.0

DEOGEN2

Benign

0.060

T;.;.;.;T;.;.

Eigen

Benign

-0.31

Eigen_PC

Benign

-0.40

FATHMM_MKL

Benign

0.15

M_CAP

Benign

0.083

MetaRNN

Benign

0.16

T;T;T;T;T;T;T

MetaSVM

Benign

-0.66

MutationAssessor

Uncertain

2.2

M;.;.;.;M;.;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.35

PROVEAN

Benign

-1.2

N;.;.;.;.;.;.

REVEL

Uncertain

0.49

Sift

Uncertain

0.024

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

Sift4G

Uncertain

0.029

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

Polyphen

0.73

P;.;.;.;P;.;.

Vest4

0.51

MVP

0.88

MPC

0.30

ClinPred

0.11

GERP RS

1.9

Varity_R

0.11

gMVP

0.70

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