2-197705421-G-T

Variant names:

• chr2-197705421-G-T
• rs368756037
• NM_138395.4:c.16G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_138395.4(MARS2):​c.16G>T​(p.Val6Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V6I) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MARS2 NM_138395.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.719
• Publications: 1 publications found

Genes affected

MARS2 (HGNC:25133): (methionyl-tRNA synthetase 2, mitochondrial) This gene produces a mitochondrial methionyl-tRNA synthetase protein that is encoded by the nuclear genome and imported to the mitochondrion. This protein likely functions as a monomer and is predicted to localize to the mitochondrial matrix. Mutations in this gene are associated with the autosomal recessive neurodegenerative disease spastic ataxia-3 (SPAX3). [provided by RefSeq, Apr 2014]

MARS2 Gene-Disease associations (from GenCC):

• mitochondrial disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• spastic ataxia 3

  Inheritance: AR Classification: MODERATE, SUPPORTIVE, LIMITED Submitted by: Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• combined oxidative phosphorylation defect type 25

  Inheritance: Unknown, AR Classification: SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet

ENSG00000222017 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12147081).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MARS2	NM_138395.4	c.16G>T	p.Val6Phe	missense_variant	Exon 1 of 1	ENST00000282276.8	NP_612404.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MARS2	ENST00000282276.8	c.16G>T	p.Val6Phe	missense_variant	Exon 1 of 1	6	NM_138395.4	ENSP00000282276.6
ENSG00000222017	ENST00000409845.1	n.166+6557G>T		intron_variant	Intron 2 of 3	1
ENSG00000222017	ENST00000721462.1	n.213+64920G>T		intron_variant	Intron 1 of 2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.59
CADD	Benign	4.3
DANN	Benign	0.94
DEOGEN2	Benign	0.096	T
Eigen	Benign	-0.84
Eigen_PC	Benign	-0.84
FATHMM_MKL	Benign	0.39	N
LIST_S2	Benign	0.50	T
M_CAP	Benign	0.037	D
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N
PhyloP100		0.72
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-0.27	N
REVEL	Benign	0.079
Sift	Benign	0.10	T
Sift4G	Benign	0.061	T
Polyphen		0.50	P
Vest4		0.15
MutPred		0.26		Gain of sheet (P = 0.0344);
MVP		0.50
MPC		0.63
ClinPred		0.17	T
GERP RS		3.6
PromoterAI		0.022	Neutral
Varity_R		0.070
gMVP		0.62
Mutation Taster		=99/1	polymorphism

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

Other links and lift over

dbSNP: rs368756037; hg19: chr2-198570145;