chr10-80283967-G-A

Variant names:

Variant summary

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

The NM_000429.3(MAT1A):c.241C>T(p.Arg81Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000242 in 1,614,182 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000022 ( 0 hom. )

Consequence

MAT1A
NM_000429.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 2.16

Variant links:

Genes affected

MAT1A (HGNC:6903): (methionine adenosyltransferase 1A) This gene catalyzes a two-step reaction that involves the transfer of the adenosyl moiety of ATP to methionine to form S-adenosylmethionine and tripolyphosphate, which is subsequently cleaved to PPi and Pi. S-adenosylmethionine is the source of methyl groups for most biological methylations. The encoded protein is found as a homotetramer (MAT I) or a homodimer (MAT III) whereas a third form, MAT II (gamma), is encoded by the MAT2A gene. Mutations in this gene are associated with methionine adenosyltransferase deficiency. [provided by RefSeq, Jul 2008]

MAT1A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MAT1A	NM_000429.3 link	c.241C>T	p.Arg81Trp	missense_variant	Exon 3 of 9	ENST00000372213.8	NP_000420.1	Q00266

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MAT1A	ENST00000372213.8 link	c.241C>T	p.Arg81Trp	missense_variant	Exon 3 of 9	1	NM_000429.3	ENSP00000361287.3		Q00266
MAT1A	ENST00000455001.1 link	c.103+1545C>T		intron_variant	Intron 2 of 4	5		ENSP00000414961.1		B1ANE6

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000517

AC:

AN:

251366

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135856

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000260

Gnomad ASJ exome

AF:

0.000298

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000219

AC:

AN:

1461872

Hom.:

Cov.:

AF XY:

0.0000179

AC XY:

AN XY:

727238

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000313

Gnomad4 ASJ exome

AF:

0.000306

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000719

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152310

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000676

Hom.:

Bravo

AF:

0.0000604

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Apr 12, 2021	Missense variants in this gene are often considered pathogenic (Stenson et al., 2014); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -
Uncertain significance, no assertion criteria provided	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	-	The MAT1A p.Arg81Trp variant was not identified in the literature nor was it identified in Cosmic or LOVD 3.0. The variant was identified in dbSNP (ID: rs750570720) and Clinvar (classified as a variant of uncertain significance by Illumina, Invitae and ARUP Laboratories for hepatic methionine adenosyltransferase deficiency). The variant was identified in control databases in 14 of 282762 chromosomes at a frequency of 0.00005 (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: Ashkenazi Jewish in 3 of 10366 chromosomes (freq: 0.000289), Latino in 9 of 35426 chromosomes (freq: 0.000254) and European (non-Finnish) in 2 of 129098 chromosomes (freq: 0.000015); it was not observed in the African, East Asian, European (Finnish), Other and South Asian populations. The variant occurs outside of the splicing consensus sequence and 3 of 4 in silico or computational prediction software programs (SpliceSiteFinder, NNSPLICE, GeneSplicer) do not predict a change in splicing. The p.Arg81 residue is conserved in mammals but not in more distantly related organisms, and four out of five computational analyses (PolyPhen-2, SIFT, BLOSUM, MutationTaster) suggest that the variant may impact the protein; however, this information is not predictive enough to assume pathogenicity. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Jun 16, 2017	The p.Arg81Trp variant (rs750570720) has not been reported in the medical literature or gene specific variation databases but has been reported to ClinVar (Variation ID: 301190). This variant is listed in the Exome Aggregation Consortium Browser with an overall population frequency of 0.002 percent (identified on 2 out of 121,086 chromosomes). The arginine at position 81 is moderately conserved (considering 15 species) and computational analyses of the effects of the p.Arg81Trp variant on protein structure and function predict a deleterious effect (SIFT: damaging, MutationTaster: disease causing, PolyPhen-2: possibly damaging). Altogether, there is not enough evidence to classify the p.Arg81Trp variant with certainty. -

Hepatic methionine adenosyltransferase deficiency

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 30, 2025	This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 81 of the MAT1A protein (p.Arg81Trp). This variant is present in population databases (rs750570720, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with MAT1A-related conditions. ClinVar contains an entry for this variant (Variation ID: 301190). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt MAT1A protein function with a negative predictive value of 80%. 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 16, 2024

The c.241C>T (p.R81W) alteration is located in exon 3 (coding exon 3) of the MAT1A gene. This alteration results from a C to T substitution at nucleotide position 241, causing the arginine (R) at amino acid position 81 to be replaced by a tryptophan (W). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.050

BayesDel_noAF

Uncertain

-0.020

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.89

Eigen

Uncertain

0.61

Eigen_PC

Uncertain

0.63

FATHMM_MKL

Uncertain

0.92

LIST_S2

Pathogenic

0.98

M_CAP

Uncertain

0.15

MetaRNN

Uncertain

0.60

MetaSVM

Uncertain

0.57

MutationAssessor

Uncertain

2.3

PrimateAI

Uncertain

0.50

PROVEAN

Uncertain

-4.3

REVEL

Uncertain

0.62

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.60

MutPred

0.50

Gain of catalytic residue at Q80 (P = 0.0797);

MVP

0.58

MPC

1.0

ClinPred

0.72

GERP RS

5.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.77

gMVP

0.69

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

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