14-64415662-A-T

Variant names:

• chr14-64415662-A-T
• rs1950902
• NM_005956.4:c.401A>T

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_005956.4(MTHFD1):​c.401A>T​(p.Lys134Ile) 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K134R) has been classified as Benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MTHFD1 NM_005956.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 8.82
• Publications: 127 publications found

Genes affected

MTHFD1 (HGNC:7432): (methylenetetrahydrofolate dehydrogenase, cyclohydrolase and formyltetrahydrofolate synthetase 1) This gene encodes a protein that possesses three distinct enzymatic activities, 5,10-methylenetetrahydrofolate dehydrogenase, 5,10-methenyltetrahydrofolate cyclohydrolase and 10-formyltetrahydrofolate synthetase. Each of these activities catalyzes one of three sequential reactions in the interconversion of 1-carbon derivatives of tetrahydrofolate, which are substrates for methionine, thymidylate, and de novo purine syntheses. The trifunctional enzymatic activities are conferred by two major domains, an aminoterminal portion containing the dehydrogenase and cyclohydrolase activities and a larger synthetase domain. [provided by RefSeq, Jul 2008]

MTHFD1 Gene-Disease associations (from GenCC):

• combined immunodeficiency and megaloblastic anemia with or without hyperhomocysteinemia

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.788

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005956.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MTHFD1	NM_005956.4	MANE Select	c.401A>T	p.Lys134Ile	missense	Exon 6 of 28	NP_005947.3
	MTHFD1	NM_001364837.1		c.401A>T	p.Lys134Ile	missense	Exon 6 of 27	NP_001351766.1	F5H2F4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MTHFD1	ENST00000652337.1	MANE Select	c.401A>T	p.Lys134Ile	missense	Exon 6 of 28	ENSP00000498336.1	P11586
	MTHFD1	ENST00000555252.5	TSL:1	n.458A>T		non_coding_transcript_exon	Exon 5 of 17
	MTHFD1	ENST00000545908.6	TSL:2	c.401A>T	p.Lys134Ile	missense	Exon 6 of 27	ENSP00000438588.2	F5H2F4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 39

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.58
BayesDel_addAF	Uncertain	0.078	D
BayesDel_noAF	Benign	-0.13
CADD	Pathogenic	27
DANN	Uncertain	0.99
Eigen	Pathogenic	0.71
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.79	D
MetaSVM	Uncertain	0.063	D
PhyloP100		8.8
PrimateAI	Uncertain	0.57	T
PROVEAN	Pathogenic	-4.7	D
REVEL	Uncertain	0.41
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.0080	D
Polyphen		0.92	P
Vest4		0.78
MutPred		0.64		Loss of ubiquitination at K190 (P = 0.0255)
MVP		0.51
MPC		1.6
ClinPred		0.99	D
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Mutation Taster		=12/88	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: rs1950902; hg19: chr14-64882380;