NM_000429.3:c.1131C>T

Variant names:

• chr10-80273838-G-A
• rs2993763
• NM_000429.3:c.1131C>T

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BA1

The NM_000429.3(MAT1A):​c.1131C>T​(p.Tyr377Tyr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.475 in 1,610,836 control chromosomes in the GnomAD database, including 187,594 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.54 (23794 hom., cov: 32)
  • Exomes 𝑓: 0.47 (163800 hom.)
• Consequence: MAT1A NM_000429.3 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -0.471

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]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.73).
• BP6: Variant 10-80273838-G-A is Benign according to our data. Variant chr10-80273838-G-A is described in ClinVar as [Benign]. Clinvar id is 256104.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr10-80273838-G-A is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=-0.471 with no splicing effect.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.74 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MAT1A	NM_000429.3	c.1131C>T	p.Tyr377Tyr	synonymous_variant	Exon 9 of 9	ENST00000372213.8	NP_000420.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MAT1A	ENST00000372213.8	c.1131C>T	p.Tyr377Tyr	synonymous_variant	Exon 9 of 9	1	NM_000429.3	ENSP00000361287.3
MAT1A	ENST00000480845.1	n.363C>T		non_coding_transcript_exon_variant	Exon 3 of 5	3
MAT1A	ENST00000485270.5	n.643C>T		non_coding_transcript_exon_variant	Exon 3 of 3	2

Frequencies

GnomAD3 genomes AF: 0.543 AC: 82513 AN: 151940 Hom.: 23755 Cov.: 32

Gnomad AFR AF: 0.747

Gnomad AMI AF: 0.347

Gnomad AMR AF: 0.543

Gnomad ASJ AF: 0.470

Gnomad EAS AF: 0.453

Gnomad SAS AF: 0.645

Gnomad FIN AF: 0.424

Gnomad MID AF: 0.481

Gnomad NFE AF: 0.444

Gnomad OTH AF: 0.517

GnomAD3 exomes AF: 0.506 AC: 126549 AN: 250074 Hom.: 33145 AF XY: 0.505 AC XY: 68313 AN XY: 135308

Gnomad AFR exome AF: 0.752

Gnomad AMR exome AF: 0.544

Gnomad ASJ exome AF: 0.479

Gnomad EAS exome AF: 0.455

Gnomad SAS exome AF: 0.624

Gnomad FIN exome AF: 0.429

Gnomad NFE exome AF: 0.453

Gnomad OTH exome AF: 0.496

GnomAD4 exome AF: 0.468 AC: 682324 AN: 1458778 Hom.: 163800 Cov.: 38 AF XY: 0.471 AC XY: 341894 AN XY: 725856

Gnomad4 AFR exome AF: 0.759

Gnomad4 AMR exome AF: 0.548

Gnomad4 ASJ exome AF: 0.476

Gnomad4 EAS exome AF: 0.408

Gnomad4 SAS exome AF: 0.626

Gnomad4 FIN exome AF: 0.429

Gnomad4 NFE exome AF: 0.446

Gnomad4 OTH exome AF: 0.489

GnomAD4 genome AF: 0.543 AC: 82615 AN: 152058 Hom.: 23794 Cov.: 32 AF XY: 0.545 AC XY: 40539 AN XY: 74332

Gnomad4 AFR AF: 0.747

Gnomad4 AMR AF: 0.543

Gnomad4 ASJ AF: 0.470

Gnomad4 EAS AF: 0.454

Gnomad4 SAS AF: 0.646

Gnomad4 FIN AF: 0.424

Gnomad4 NFE AF: 0.444

Gnomad4 OTH AF: 0.519

Alfa AF: 0.465 Hom.: 39397

Bravo AF: 0.556

Asia WGS AF: 0.573 AC: 1995 AN: 3478

EpiCase AF: 0.455

EpiControl AF: 0.447

ClinVar

Significance: Benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Mar 03, 2015

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Hepatic methionine adenosyltransferase deficiency Benign:2

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified Benign:1

-

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.73
CADD	Benign	0.26
DANN	Benign	0.33
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs2993763; hg19: chr10-82033594; COSMIC: COSV64745496; COSMIC: COSV64745496;