15-79889095-G-A

Position:

chr15-79889095-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_006441.4(MTHFS):c.377C>T(p.Thr126Ile) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000372 in 1,613,986 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

MTHFS
NM_006441.4 missense, splice_region

Scores

Splicing: ADA: 0.2314

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.03

Variant links:

Genes affected

MTHFS (HGNC:7437): (methenyltetrahydrofolate synthetase) The protein encoded by this gene is an enzyme that catalyzes the conversion of 5-formyltetrahydrofolate to 5,10-methenyltetrahydrofolate, a precursor of reduced folates involved in 1-carbon metabolism. An increased activity of the encoded protein can result in an increased folate turnover rate and folate depletion. Three transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Jun 2011]

MTHFS links:

ST20-MTHFS (HGNC:):

ST20-MTHFS links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.2940244).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
MTHFS	NM_006441.4 linkuse as main transcript	c.377C>T	p.Thr126Ile	missense_variant, splice_region_variant	2/3	ENST00000258874.4	NP_006432.1
ST20-MTHFS	NM_001199760.2 linkuse as main transcript	c.305C>T	p.Thr102Ile	missense_variant, splice_region_variant	3/4		NP_001186689.1
MTHFS	NM_001199758.1 linkuse as main transcript	c.206C>T	p.Thr69Ile	missense_variant, splice_region_variant	2/3		NP_001186687.1
MTHFS	NR_037654.2 linkuse as main transcript	n.484C>T		splice_region_variant, non_coding_transcript_exon_variant	2/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MTHFS	ENST00000258874.4 linkuse as main transcript	c.377C>T	p.Thr126Ile	missense_variant, splice_region_variant	2/3	1	NM_006441.4	ENSP00000258874	P1	P49914-1
MTHFS	ENST00000559722.2 linkuse as main transcript	c.464C>T	p.Thr155Ile	missense_variant, splice_region_variant	2/3	2		ENSP00000489076
MTHFS	ENST00000560919.5 linkuse as main transcript	c.*323C>T		3_prime_UTR_variant, NMD_transcript_variant	2/2	2		ENSP00000454626

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152176

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1461810

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727192

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152176

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74344

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 12, 2022

This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 126 of the MTHFS protein (p.Thr126Ile). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with MTHFS-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.36

BayesDel_addAF

Benign

-0.11

BayesDel_noAF

Benign

-0.39

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.44

T;.;.;.;.

Eigen

Uncertain

0.43

Eigen_PC

Uncertain

0.39

FATHMM_MKL

Uncertain

0.78

LIST_S2

Uncertain

0.90

D;D;.;D;D

M_CAP

Benign

0.0091

MetaRNN

Benign

0.29

T;T;T;T;T

MetaSVM

Benign

-0.92

MutationAssessor

Pathogenic

3.1

M;.;.;.;.

MutationTaster

Benign

1.0

N;N

PrimateAI

Uncertain

0.63

PROVEAN

Pathogenic

-4.6

D;.;.;D;.

REVEL

Benign

0.16

Sift

Uncertain

0.0050

D;.;.;D;.

Sift4G

Benign

0.20

T;T;T;T;.

Polyphen

1.0

D;.;.;.;.

Vest4

0.22

MutPred

0.56

Loss of relative solvent accessibility (P = 0.0404);.;.;.;.;

MVP

0.47

MPC

0.69

ClinPred

0.99

GERP RS

4.2

Varity_R

0.35

gMVP

0.37

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.23

dbscSNV1_RF

Benign

0.37

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over