rs587777227

Positions:

• chr12-57488103-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_004990.4(MARS1):​c.13G>A​(p.Val5Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000041 in 1,461,818 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: MARS1 NM_004990.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 1.94

Genes affected

MARS1 (HGNC:6898): (methionyl-tRNA synthetase 1) This gene encodes a 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. The encoded protein is a component of the multi-tRNA synthetase complex and catalyzes the ligation of methionine to tRNA molecules. [provided by RefSeq, Jan 2011]

ARHGAP9 (HGNC:14130): (Rho GTPase activating protein 9) This gene encodes a member of the Rho-GAP family of GTPase activating proteins. The protein has substantial GAP activity towards several Rho-family GTPases in vitro, converting them to an inactive GDP-bound state. It is implicated in regulating adhesion of hematopoietic cells to the extracellular matrix. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

MARS1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MARS1	NM_004990.4	c.13G>A	p.Val5Met	missense_variant	1/21	ENST00000262027.10	NP_004981.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MARS1	ENST00000262027.10	c.13G>A	p.Val5Met	missense_variant	1/21	1	NM_004990.4	ENSP00000262027.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251154 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135758

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.00000881

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461818 Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3 AN XY: 727208

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000270

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Spastic paraplegia 70, autosomal recessive Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jan 31, 2014

- -

Charcot-Marie-Tooth disease axonal type 2U;C4225400:Severe early-onset pulmonary alveolar proteinosis due to MARS deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 22, 2023

This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 5 of the MARS protein (p.Val5Met). This variant is present in population databases (rs587777227, gnomAD 0.0009%). This missense change has been observed in individual(s) with clinical features of Charcot-Marie-Tooth disease and autosomal recessive hereditary spastic paraplegia (PMID: 24482476; Invitae). ClinVar contains an entry for this variant (Variation ID: 120186). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. 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	Uncertain	0.52
BayesDel_addAF	Uncertain	0.037	T
BayesDel_noAF	Benign	-0.19
CADD	Uncertain	24
DANN	Benign	0.96
DEOGEN2	Benign	0.27	T;.;.;T
Eigen	Benign	0.051
Eigen_PC	Benign	0.012
FATHMM_MKL	Benign	0.73	D
LIST_S2	Uncertain	0.93	D;D;D;D
M_CAP	Pathogenic	0.42	D
MetaRNN	Uncertain	0.65	D;D;D;D
MetaSVM	Benign	-0.29	T
MutationAssessor	Benign	1.8	L;.;.;.
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-0.73	N;.;.;.
REVEL	Pathogenic	0.76
Sift	Uncertain	0.016	D;.;.;.
Sift4G	Uncertain	0.037	D;D;D;D
Polyphen		0.99	D;.;.;.
Vest4		0.58
MutPred		0.27		Gain of catalytic residue at V9 (P = 0);Gain of catalytic residue at V9 (P = 0);Gain of catalytic residue at V9 (P = 0);Gain of catalytic residue at V9 (P = 0);
MVP		0.78
MPC		0.38
ClinPred		0.61	D
GERP RS		3.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.21
gMVP		0.56

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

Publications

LitVar

Other links and lift over

dbSNP: rs587777227; hg19: chr12-57881886;