rs117788141

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2BP4_ModerateBS1_Supporting

The NM_024537.4(CARS2):c.244G>A(p.Val82Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000879 in 1,613,236 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00092 ( 0 hom. )

Consequence

CARS2
NM_024537.4 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 4.95

Variant links:

Genes affected

CARS2 (HGNC:25695): (cysteinyl-tRNA synthetase 2, mitochondrial) This gene encodes a putative member of the class I family of aminoacyl-tRNA synthetases. These enzymes play a critical role in protein biosynthesis by charging tRNAs with their cognate amino acids. This protein is encoded by the nuclear genome but is likely to be imported to the mitochondrion where it is thought to catalyze the ligation of cysteine to tRNA molecules. A splice-site mutation in this gene has been associated with a novel progressive myoclonic epilepsy disease with similar symptoms to MERRF syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2017]

CARS2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.18579406).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000532 (81/152342) while in subpopulation NFE AF= 0.000867 (59/68032). AF 95% confidence interval is 0.00069. There are 0 homozygotes in gnomad4. There are 38 alleles in male gnomad4 subpopulation. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CARS2	NM_024537.4 linkuse as main transcript	c.244G>A	p.Val82Ile	missense_variant	2/15	ENST00000257347.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CARS2	ENST00000257347.9 linkuse as main transcript	c.244G>A	p.Val82Ile	missense_variant	2/15	1	NM_024537.4	P1

Frequencies

GnomAD3 genomes

AF:

0.000532

AC:

AN:

152224

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000434

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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:

0.000867

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000474

AC:

119

AN:

250858

Hom.:

AF XY:

0.000457

AC XY:

AN XY:

135636

show subpopulations

Gnomad AFR exome

AF:

0.000246

Gnomad AMR exome

AF:

0.000262

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:

0.000933

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000915

AC:

1337

AN:

1460894

Hom.:

Cov.:

AF XY:

0.000848

AC XY:

616

AN XY:

726798

show subpopulations

Gnomad4 AFR exome

AF:

0.000329

Gnomad4 AMR exome

AF:

0.000269

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.00115

Gnomad4 OTH exome

AF:

0.000530

GnomAD4 genome

AF:

0.000532

AC:

AN:

152342

Hom.:

Cov.:

AF XY:

0.000510

AC XY:

AN XY:

74498

show subpopulations

Gnomad4 AFR

AF:

0.000433

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000867

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000768

Hom.:

Bravo

AF:

0.000552

TwinsUK

AF:

0.00135

AC:

ALSPAC

AF:

0.00234

AC:

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.00151

AC:

ExAC

AF:

0.000469

AC:

EpiCase

AF:

0.000764

EpiControl

AF:

0.000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Combined oxidative phosphorylation defect type 27

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Apr 02, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Nov 01, 2022	This sequence change replaces valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 82 of the CARS2 protein (p.Val82Ile). This variant is present in population databases (rs117788141, gnomAD 0.09%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with CARS2-related conditions. ClinVar contains an entry for this variant (Variation ID: 542307). 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 not expected to disrupt CARS2 protein function. 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. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Feb 19, 2024

Variant summary: CARS2 c.244G>A (p.Val82Ile) results in a conservative amino acid change located in the catalytic domain (IPR032678) of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00088 (i.e. in 1418 heterozygotes) in 1606264 control chromosomes (gnomAD v4.0). To our knowledge, no occurrence of c.244G>A in individuals affected with Combined Oxidative Phosphorylation Defect Type 27 and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 542307). Based on the evidence outlined above, the variant was classified as uncertain significance. -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Aug 13, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.29

BayesDel_addAF

Benign

-0.32

BayesDel_noAF

Benign

-0.24

Cadd

Pathogenic

Dann

Uncertain

1.0

DEOGEN2

Benign

0.36

T;.

Eigen

Pathogenic

0.79

Eigen_PC

Pathogenic

0.67

FATHMM_MKL

Benign

0.72

LIST_S2

Pathogenic

1.0

D;D

M_CAP

Benign

0.050

MetaRNN

Benign

0.19

T;T

MetaSVM

Uncertain

-0.049

MutationAssessor

Pathogenic

3.0

M;.

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.75

PROVEAN

Benign

-0.93

N;N

REVEL

Uncertain

0.38

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.48

MVP

0.57

MPC

0.63

ClinPred

0.16

GERP RS

4.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.80

gMVP

0.73

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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