rs2274974

Variant names:

• chr1-11791262-C-T
• rs2274974
• NM_005957.5:c.1697G>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_005957.5(MTHFR):​c.1697G>A​(p.Gly566Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G566G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: MTHFR NM_005957.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.35
• Publications: 7 publications found

Genes affected

MTHFR (HGNC:7436): (methylenetetrahydrofolate reductase) The protein encoded by this gene catalyzes the conversion of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate, a co-substrate for homocysteine remethylation to methionine. Genetic variation in this gene influences susceptibility to occlusive vascular disease, neural tube defects, colon cancer and acute leukemia, and mutations in this gene are associated with methylenetetrahydrofolate reductase deficiency.[provided by RefSeq, Oct 2009]

MTHFR Gene-Disease associations (from GenCC):

• homocystinuria due to methylene tetrahydrofolate reductase deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, ClinGen, Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.857

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MTHFR	NM_005957.5	c.1697G>A	p.Gly566Glu	missense_variant	Exon 11 of 12	ENST00000376590.9	NP_005948.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MTHFR	ENST00000376590.9	c.1697G>A	p.Gly566Glu	missense_variant	Exon 11 of 12	1	NM_005957.5	ENSP00000365775.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

Alfa AF: 0.00000577 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.87
BayesDel_addAF	Pathogenic	0.39	D
BayesDel_noAF	Pathogenic	0.32
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.79	D;.;.;D;.;.;.
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.85
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Pathogenic	0.98	.;D;.;D;D;D;D
M_CAP	Uncertain	0.23	D
MetaRNN	Pathogenic	0.86	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.42	D
MutationAssessor	Pathogenic	3.9	H;.;.;H;.;.;.
PhyloP100		7.3
PrimateAI	Uncertain	0.76	T
PROVEAN	Pathogenic	-6.0	D;D;D;D;.;.;.
REVEL	Pathogenic	0.67
Sift	Uncertain	0.0050	D;D;D;D;.;.;.
Sift4G	Uncertain	0.0060	D;D;D;D;.;.;.
Polyphen		1.0	D;.;.;D;.;.;.
Vest4		0.93
MutPred		0.30		Gain of solvent accessibility (P = 0.0374);.;.;Gain of solvent accessibility (P = 0.0374);.;Gain of solvent accessibility (P = 0.0374);.;
MVP		0.96
MPC		1.1
ClinPred		1.0	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.85
gMVP		0.86
Mutation Taster		=7/93	disease causing

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

Other links and lift over

dbSNP: rs2274974; hg19: chr1-11851319;