rs761462996

Positions:

• chr10-80280745-A-C
• chr10-80280745-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000429.3(MAT1A):​c.340T>G​(p.Ser114Ala) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MAT1A NM_000429.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.73

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 Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.869

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MAT1A	NM_000429.3	c.340T>G	p.Ser114Ala	missense_variant	4/9	ENST00000372213.8	NP_000420.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MAT1A	ENST00000372213.8	c.340T>G	p.Ser114Ala	missense_variant	4/9	1	NM_000429.3	ENSP00000361287.3
MAT1A	ENST00000455001.1	c.151T>G	p.Ser51Ala	missense_variant	3/5	5		ENSP00000414961.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hepatic methionine adenosyltransferase deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 13, 2017

In summary, this variant has uncertain impact on MAT1A function. The available evidence is currently insufficient to determine its role in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C65"). This variant has not been reported in the literature in individuals with a MAT1A-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with alanine at codon 114 of the MAT1A protein (p.Ser114Ala). The serine residue is highly conserved and there is a moderate physicochemical difference between serine and alanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.84	D;D
Eigen	Benign	0.15
Eigen_PC	Uncertain	0.26
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.91	D;D
M_CAP	Uncertain	0.24	D
MetaRNN	Pathogenic	0.87	D;D
MetaSVM	Uncertain	0.47	D
MutationAssessor	Uncertain	2.6	M;.
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-2.1	N;N
REVEL	Pathogenic	0.72
Sift	Benign	0.047	D;T
Sift4G	Uncertain	0.039	D;D
Polyphen		0.0030	B;.
Vest4		0.77
MutPred		0.74		Loss of helix (P = 0.1299);.;
MVP		0.55
MPC		0.53
ClinPred		0.95	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.64
gMVP		0.93

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

Other links and lift over

dbSNP: rs761462996; hg19: chr10-82040501;