1-11796313-T-G

Position:

• chr1-11796313-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP5

The NM_005957.5(MTHFR):​c.673A>C​(p.Ile225Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I225V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MTHFR NM_005957.5 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 1.30

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-11796313-T-G is Pathogenic according to our data. Variant chr1-11796313-T-G is described in ClinVar as [Pathogenic]. Clinvar id is 187879.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MTHFR	NM_005957.5	c.673A>C	p.Ile225Leu	missense_variant	5/12	ENST00000376590.9	NP_005948.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MTHFR	ENST00000376590.9	c.673A>C	p.Ile225Leu	missense_variant	5/12	1	NM_005957.5	ENSP00000365775.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Homocystinuria due to methylene tetrahydrofolate reductase deficiency Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

University Children's Hospital, University of Zurich

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.30
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.83	D;.;.;D;.;.;.
Eigen	Benign	-0.11
Eigen_PC	Benign	-0.17
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.84	.;T;.;T;T;D;D
M_CAP	Uncertain	0.12	D
MetaRNN	Uncertain	0.55	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.29	D
MutationAssessor	Benign	1.8	L;.;.;L;.;.;.
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-2.0	N;N;N;N;.;.;.
REVEL	Uncertain	0.63
Sift	Uncertain	0.0050	D;D;D;D;.;.;.
Sift4G	Uncertain	0.014	D;D;D;D;.;.;.
Polyphen		0.93	P;.;.;P;.;.;.
Vest4		0.49
MutPred		0.66		Loss of sheet (P = 0.0817);.;.;Loss of sheet (P = 0.0817);.;Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);
MVP		0.85
MPC		0.64
ClinPred		0.83	D
GERP RS		1.5
Varity_R		0.82
gMVP		0.85

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

Publications

LitVar

Other links and lift over

dbSNP: rs200100285; hg19: chr1-11856370;