chr15-79889227-C-T

Position:

chr15-79889227-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_006441.4(MTHFS):c.245G>A(p.Arg82Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000105 in 1,613,992 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R82W) has been classified as Uncertain significance.

Frequency

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

Exomes 𝑓: 0.000010 ( 1 hom. )

Consequence

MTHFS
NM_006441.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.559

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.16296566).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
MTHFS	NM_006441.4 linkuse as main transcript	c.245G>A	p.Arg82Gln	missense_variant	2/3	ENST00000258874.4
ST20-MTHFS	NM_001199760.2 linkuse as main transcript	c.173G>A	p.Arg58Gln	missense_variant	3/4
MTHFS	NM_001199758.1 linkuse as main transcript	c.74G>A	p.Arg25Gln	missense_variant	2/3
MTHFS	NR_037654.2 linkuse as main transcript	n.352G>A		non_coding_transcript_exon_variant	2/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MTHFS	ENST00000258874.4 linkuse as main transcript	c.245G>A	p.Arg82Gln	missense_variant	2/3	1	NM_006441.4	P1	P49914-1
MTHFS	ENST00000559722.2 linkuse as main transcript	c.332G>A	p.Arg111Gln	missense_variant	2/3	2
MTHFS	ENST00000560919.5 linkuse as main transcript	c.*191G>A		3_prime_UTR_variant, NMD_transcript_variant	2/2	2

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152102

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251490

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135922

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000163

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.0000103

AC:

AN:

1461890

Hom.:

Cov.:

AF XY:

0.00000963

AC XY:

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000101

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.000166

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152102

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74310

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000866

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 28, 2023

The c.173G>A (p.R58Q) alteration is located in exon 3 (coding exon 2) of the ST20-MTHFS gene. This alteration results from a G to A substitution at nucleotide position 173, causing the arginine (R) at amino acid position 58 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.33

BayesDel_noAF

Benign

-0.45

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.38

T;.;.;.;.

Eigen

Benign

-0.42

Eigen_PC

Benign

-0.45

FATHMM_MKL

Benign

0.37

LIST_S2

Uncertain

0.90

D;D;.;D;D

M_CAP

Benign

0.010

MetaRNN

Benign

0.16

T;T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Uncertain

2.3

M;.;.;.;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Benign

0.26

PROVEAN

Benign

-2.3

N;.;.;N;.

REVEL

Benign

0.11

Sift

Benign

0.11

T;.;.;T;.

Sift4G

Benign

0.32

T;T;T;T;.

Polyphen

0.85

P;.;.;.;.

Vest4

0.25

MutPred

0.59

Loss of MoRF binding (P = 0.033);.;.;.;.;

MVP

0.42

MPC

0.35

ClinPred

0.19

GERP RS

3.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.33

gMVP

0.72

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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