chr2-197705457-C-G

Variant names:

• chr2-197705457-C-G
• rs1230377660
• NM_138395.4:c.52C>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_138395.4(MARS2):​c.52C>G​(p.Leu18Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,424 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. Synonymous variant affecting the same amino acid position (i.e. L18L) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: MARS2 NM_138395.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.909
• Publications: 0 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: Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp
• 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: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.041384578).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_138395.4. 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
	MARS2	NM_138395.4	MANE Select	c.52C>G	p.Leu18Val	missense	Exon 1 of 1	NP_612404.1	Q96GW9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MARS2	ENST00000282276.8	TSL:6 MANE Select	c.52C>G	p.Leu18Val	missense	Exon 1 of 1	ENSP00000282276.6	Q96GW9
	ENSG00000222017	ENST00000409845.1	TSL:1	n.166+6593C>G		intron	N/A
	ENSG00000222017	ENST00000721462.1		n.213+64956C>G		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460424 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726526

African (AFR) AF: 0.00 AC: 0 AN: 33464

American (AMR) AF: 0.0000224 AC: 1 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26120

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86234

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52384

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5546

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111920

Other (OTH) AF: 0.00 AC: 0 AN: 60348

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.71
CADD	Benign	0.099
DANN	Benign	0.70
DEOGEN2	Benign	0.094	T
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.5
FATHMM_MKL	Benign	0.031	N
LIST_S2	Benign	0.33	T
M_CAP	Benign	0.0050	T
MetaRNN	Benign	0.041	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.0	N
PhyloP100		-0.91
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	-0.66	N
REVEL	Benign	0.010
Sift	Benign	0.87	T
Sift4G	Benign	0.81	T
Polyphen		0.0	B
Vest4		0.079
MutPred		0.27		Loss of helix (P = 0.079)
MVP		0.38
MPC		0.43
ClinPred		0.058	T
GERP RS		-2.5
PromoterAI		0.043	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.039
gMVP		0.26
Mutation Taster		=94/6	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: rs1230377660; hg19: chr2-198570181;