chr15-79845257-C-T

Position:

chr15-79845257-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1PM2PP3_Strong

The NM_006441.4(MTHFS):c.565G>A(p.Asp189Asn) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. 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)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

MTHFS
NM_006441.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.19

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 Likely_pathogenic. Variant got 8 ACMG points.

PM1

In a binding_site (size 0) in uniprot entity MTHFS_HUMAN

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.989

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
MTHFS	NM_006441.4 linkuse as main transcript	c.565G>A	p.Asp189Asn	missense_variant	3/3	ENST00000258874.4	NP_006432.1
ST20-MTHFS	NM_001199760.2 linkuse as main transcript	c.493G>A	p.Asp165Asn	missense_variant	4/4		NP_001186689.1
MTHFS	NM_001199758.1 linkuse as main transcript	c.394G>A	p.Asp132Asn	missense_variant	3/3		NP_001186687.1
MTHFS	NR_037654.2 linkuse as main transcript	n.672G>A		non_coding_transcript_exon_variant	3/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MTHFS	ENST00000258874.4 linkuse as main transcript	c.565G>A	p.Asp189Asn	missense_variant	3/3	1	NM_006441.4	ENSP00000258874	P1	P49914-1
MTHFS	ENST00000559722.2 linkuse as main transcript	c.652G>A	p.Asp218Asn	missense_variant	3/3	2		ENSP00000489076
MTHFS	ENST00000560261.1 linkuse as main transcript	c.73G>A	p.Asp25Asn	missense_variant, NMD_transcript_variant	1/4	3		ENSP00000454318

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251418

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135874

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1461888

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000151

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

Aug 24, 2023

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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 1974883). This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 189 of the MTHFS protein (p.Asp189Asn). This variant is present in population databases (no rsID available, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with MTHFS-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.94

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Uncertain

0.12

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.66

D;.;.;.

Eigen

Pathogenic

0.89

Eigen_PC

Pathogenic

0.81

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.94

D;D;.;D

M_CAP

Pathogenic

0.31

MetaRNN

Pathogenic

0.99

D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

4.0

H;.;.;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.54

PROVEAN

Pathogenic

-4.4

D;.;.;D

REVEL

Pathogenic

0.72

Sift

Pathogenic

0.0

D;.;.;D

Sift4G

Uncertain

0.047

D;D;D;D

Polyphen

0.99

D;.;.;.

Vest4

0.98

MutPred

0.93

Gain of methylation at K191 (P = 0.1018);.;.;.;

MVP

0.98

MPC

0.87

ClinPred

1.0

GERP RS

6.0

Varity_R

0.93

gMVP

0.86

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

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