NARS2 p.Gln274His

Variant names:

• chr11-78493063-C-A
• NM_024678.6:c.822G>T
• NARS2 p.Gln274His

Your query was ambiguous. Multiple possible variants found:

• chr11-78493063-C-A
• chr11-78493063-C-G

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_024678.6(NARS2):​c.822G>T​(p.Gln274His) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Pathogenic in ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: NARS2 NM_024678.6 missense, splice_region
• Scores: Splicing: ADA: 0.9999
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.47
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• combined oxidative phosphorylation defect type 24

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet
• mitochondrial disease

  Inheritance: AR Classification: MODERATE Submitted by: Illumina
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• hearing loss, autosomal recessive 94

  Inheritance: AR Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• Leigh syndrome

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen
• nonsyndromic genetic hearing loss

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

LOC105369403 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. Scorers claiming Uncertain: max_spliceai. No scorers claiming Benign.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024678.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NARS2	NM_024678.6	MANE Select	c.822G>T	p.Gln274His	missense splice_region	Exon 7 of 14	NP_078954.4
	NARS2	NM_001425299.1		c.822G>T	p.Gln274His	missense splice_region	Exon 7 of 15	NP_001412228.1
	NARS2	NM_001425300.1		c.822G>T	p.Gln274His	missense splice_region	Exon 7 of 13	NP_001412229.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NARS2	ENST00000281038.10	TSL:1 MANE Select	c.822G>T	p.Gln274His	missense splice_region	Exon 7 of 14	ENSP00000281038.5	Q96I59-1
	NARS2	ENST00000695360.1		c.822G>T	p.Gln274His	missense splice_region	Exon 7 of 14	ENSP00000511835.1	A0A8Q3SHT5
	NARS2	ENST00000695344.1		c.741G>T	p.Gln247His	missense splice_region	Exon 6 of 12	ENSP00000511819.1	A0A8Q3SHL5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Uncertain	0.050	T
BayesDel_noAF	Benign	-0.17
CADD	Pathogenic	32
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.46	T
Eigen	Benign	0.062
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.88	D
M_CAP	Benign	0.081	D
MetaRNN	Benign	0.37	T
MetaSVM	Benign	-0.42	T
MutationAssessor	Benign	1.8	L
PhyloP100		4.5
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-2.0	N
REVEL	Uncertain	0.31
Sift	Benign	0.037	D
Sift4G	Uncertain	0.021	D
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.36
gMVP		0.47
Mutation Taster		=8/92	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.98
SpliceAI score (max)		0.36		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.36		Position offset: -27

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr11-78204109;