chr11-78436797-C-T

Position:

chr11-78436797-C-T

Variant summary

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

The NM_024678.6(NARS2):c.1307G>A(p.Arg436Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000415 in 1,613,910 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R436G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00015 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000030 ( 0 hom. )

Consequence

NARS2
NM_024678.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.892

Variant links:

Genes affected

NARS2 (HGNC:26274): (asparaginyl-tRNA synthetase 2, mitochondrial) This gene encodes a putative member of the class II 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 asparagine to tRNA molecules. Mutations in this gene have been associated with combined oxidative phosphorylation deficiency 24 (COXPD24). [provided by RefSeq, Mar 2015]

NARS2 links:

(HGNC:):

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=0.20298448).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
NARS2	NM_024678.6 linkuse as main transcript	c.1307G>A	p.Arg436Gln	missense_variant	14/14	ENST00000281038.10
NARS2	NM_001243251.2 linkuse as main transcript	c.626G>A	p.Arg209Gln	missense_variant	14/14
NARS2	XM_011545253.3 linkuse as main transcript	c.1280G>A	p.Arg427Gln	missense_variant	13/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NARS2	ENST00000281038.10 linkuse as main transcript	c.1307G>A	p.Arg436Gln	missense_variant	14/14	1	NM_024678.6	P1	Q96I59-1
	ENST00000534168.1 linkuse as main transcript	n.36-6851C>T		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes

AF:

0.000151

AC:

AN:

152198

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000982

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:

0.0000441

Gnomad OTH

AF:

0.000955

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

250994

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135734

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000869

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:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000301

AC:

AN:

1461712

Hom.:

Cov.:

AF XY:

0.0000261

AC XY:

AN XY:

727160

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000291

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:

0.0000216

Gnomad4 OTH exome

AF:

0.000116

GnomAD4 genome

AF:

0.000151

AC:

AN:

152198

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74342

show subpopulations

Gnomad4 AFR

AF:

0.0000724

Gnomad4 AMR

AF:

0.000982

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.000955

Alfa

AF:

0.0000564

Hom.:

Bravo

AF:

0.000382

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 27, 2022

The c.1307G>A (p.R436Q) alteration is located in exon 14 (coding exon 14) of the NARS2 gene. This alteration results from a G to A substitution at nucleotide position 1307, causing the arginine (R) at amino acid position 436 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 07, 2022

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 436 of the NARS2 protein (p.Arg436Gln). This variant is present in population databases (rs146549914, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with NARS2-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The glutamine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.098

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.30

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.49

T;.

Eigen

Benign

-0.37

Eigen_PC

Benign

-0.32

FATHMM_MKL

Benign

0.17

LIST_S2

Uncertain

0.95

D;D

M_CAP

Benign

0.011

MetaRNN

Benign

0.20

T;T

MetaSVM

Benign

-0.48

MutationAssessor

Uncertain

2.3

M;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.22

PROVEAN

Benign

-1.6

N;N

REVEL

Benign

0.25

Sift

Benign

0.065

T;T

Sift4G

Benign

0.068

T;T

Polyphen

0.10

B;.

Vest4

0.097

MVP

0.80

MPC

0.055

ClinPred

0.33

GERP RS

0.15

Varity_R

0.083

gMVP

0.59

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