rs140573721

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM2BP4_StrongBP6BS1

The NM_004990.4(MARS1):c.2391A>C(p.Thr797=) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000806 in 1,611,908 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00070 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00082 ( 1 hom. )

Consequence

MARS1
NM_004990.4 splice_region, synonymous

Scores

Splicing: ADA: 0.00009324

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:5

Conservation

PhyloP100: -0.561

Variant links:

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]

MARS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.61).

BP6

Variant 12-57515336-A-C is Benign according to our data. Variant chr12-57515336-A-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 389593.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=5, Uncertain_significance=1}.

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000702 (107/152344) while in subpopulation AMR AF= 0.00124 (19/15302). AF 95% confidence interval is 0.000813. There are 0 homozygotes in gnomad4. There are 52 alleles in male gnomad4 subpopulation. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MARS1	NM_004990.4 linkuse as main transcript	c.2391A>C	p.Thr797=	splice_region_variant, synonymous_variant	18/21	ENST00000262027.10
MARS1	XM_047428851.1 linkuse as main transcript	c.1689A>C	p.Thr563=	splice_region_variant, synonymous_variant	14/17

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MARS1	ENST00000262027.10 linkuse as main transcript	c.2391A>C	p.Thr797=	splice_region_variant, synonymous_variant	18/21	1	NM_004990.4	P1	P56192-1

Frequencies

GnomAD3 genomes

AF:

0.000690

AC:

105

AN:

152226

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000265

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00124

Gnomad ASJ

AF:

0.00173

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.000926

Gnomad OTH

AF:

0.00239

GnomAD3 exomes

AF:

0.000776

AC:

193

AN:

248650

Hom.:

AF XY:

0.000810

AC XY:

109

AN XY:

134566

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.000957

Gnomad ASJ exome

AF:

0.00159

Gnomad EAS exome

AF:

0.0000545

Gnomad SAS exome

AF:

0.000360

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00110

Gnomad OTH exome

AF:

0.000820

GnomAD4 exome

AF:

0.000817

AC:

1193

AN:

1459564

Hom.:

Cov.:

AF XY:

0.000870

AC XY:

632

AN XY:

726102

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.000918

Gnomad4 ASJ exome

AF:

0.00214

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.000487

Gnomad4 FIN exome

AF:

0.0000194

Gnomad4 NFE exome

AF:

0.000866

Gnomad4 OTH exome

AF:

0.00106

GnomAD4 genome

AF:

0.000702

AC:

107

AN:

152344

Hom.:

Cov.:

AF XY:

0.000698

AC XY:

AN XY:

74502

show subpopulations

Gnomad4 AFR

AF:

0.000265

Gnomad4 AMR

AF:

0.00124

Gnomad4 ASJ

AF:

0.00173

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000956

Gnomad4 OTH

AF:

0.00237

Alfa

AF:

0.00123

Hom.:

Bravo

AF:

0.00100

Asia WGS

AF:

0.000866

AC:

AN:

3478

EpiCase

AF:

0.00218

EpiControl

AF:

0.00178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Apr 14, 2020	This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Oct 17, 2017	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

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

Invitae

Jan 31, 2024

This sequence change affects codon 797 of the MARS mRNA. It is a 'silent' change, meaning that it does not change the encoded amino acid sequence of the MARS protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs140573721, gnomAD 0.1%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with MARS-related conditions. ClinVar contains an entry for this variant (Variation ID: 389593). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. 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. -

Charcot-Marie-Tooth disease

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Molecular Genetics Laboratory, London Health Sciences Centre

- -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Mar 01, 2021

- -

MARS1-related disorder

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 31, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.61

Cadd

Benign

6.1

Dann

Benign

0.74

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.9

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000093

dbscSNV1_RF

Benign

0.040

SpliceAI score (max)

0.26

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.26

Position offset: 0

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