Genetic Variant MTHFR:c.1753-26G>A (chr1-11790924-C-T) – ACMG Classification: Benign (-14 pts)

Variant summary

Our verdict is Benign. The variant received -14 ACMG points: 0P and 14B. BP4_StrongBP6_ModerateBS1BS2

The NM_005957.5(MTHFR):c.1753-26G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00409 in 1,600,722 control chromosomes in the GnomAD database, including 24 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.0036 ( 2 hom., cov: 33)

Exomes 𝑓: 0.0041 ( 22 hom. )

Consequence

MTHFR
NM_005957.5 intron

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 0.237

Publications

3 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

homocystinuria due to methylene tetrahydrofolate reductase deficiency
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, ClinGen, Orphanet

MTHFR links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -14 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.97).

BP6

Variant 1-11790924-C-T is Benign according to our data. Variant chr1-11790924-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 1879073.Status of the report is criteria_provided_single_submitter, 1 stars.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.00356 (542/152306) while in subpopulation AMR AF = 0.00784 (120/15302). AF 95% confidence interval is 0.0067. There are 2 homozygotes in GnomAd4. There are 248 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 2 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005957.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
MTHFR	NM_005957.5	MANE Select	c.1753-26G>A	intron	N/A	NP_005948.3
MTHFR	NM_001330358.2		c.1876-26G>A	intron	N/A	NP_001317287.1
MTHFR	NM_001410750.1		c.1873-26G>A	intron	N/A	NP_001397679.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
MTHFR	ENST00000376590.9	TSL:1 MANE Select	c.1753-26G>A	intron	N/A	ENSP00000365775.3
MTHFR	ENST00000423400.7	TSL:1	c.1873-26G>A	intron	N/A	ENSP00000398908.3
MTHFR	ENST00000376592.6	TSL:1	c.1753-26G>A	intron	N/A	ENSP00000365777.1

Frequencies

GnomAD3 genomes

AF:

0.00356

AC:

542

AN:

152188

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00123

Gnomad AMI

AF:

0.00877

Gnomad AMR

AF:

0.00785

Gnomad ASJ

AF:

0.00374

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00166

Gnomad FIN

AF:

0.000376

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.00478

Gnomad OTH

AF:

0.00525

GnomAD2 exomes

AF:

0.00327

AC:

817

AN:

249930

AF XY:

0.00323

show subpopulations

Gnomad AFR exome

AF:

0.000496

Gnomad AMR exome

AF:

0.00440

Gnomad ASJ exome

AF:

0.00569

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000370

Gnomad NFE exome

AF:

0.00478

Gnomad OTH exome

AF:

0.00458

GnomAD4 exome

AF:

0.00414

AC:

5999

AN:

1448416

Hom.:

Cov.:

AF XY:

0.00412

AC XY:

2971

AN XY:

721272

show subpopulations

African (AFR)

AF:

0.000663

AC:

AN:

33164

American (AMR)

AF:

0.00474

AC:

212

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00621

AC:

162

AN:

26072

East Asian (EAS)

AF:

0.00

AC:

AN:

39624

South Asian (SAS)

AF:

0.00106

AC:

AN:

85936

European-Finnish (FIN)

AF:

0.000544

AC:

AN:

53318

Middle Eastern (MID)

AF:

0.00334

AC:

AN:

5696

European-Non Finnish (NFE)

AF:

0.00475

AC:

5223

AN:

1100036

Other (OTH)

AF:

0.00403

AC:

241

AN:

59854

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.499

Heterozygous variant carriers

308

615

923

1230

1538

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

202

404

606

808

1010

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00356

AC:

542

AN:

152306

Hom.:

Cov.:

AF XY:

0.00333

AC XY:

248

AN XY:

74476

show subpopulations

African (AFR)

AF:

0.00123

AC:

AN:

41558

American (AMR)

AF:

0.00784

AC:

120

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00374

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5174

South Asian (SAS)

AF:

0.00166

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.000376

AC:

AN:

10628

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00478

AC:

325

AN:

68024

Other (OTH)

AF:

0.00520

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

114

143

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00369

Hom.:

Bravo

AF:

0.00403

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Benign:1

Feb 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

MTHFR: BS2

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.97

CADD

Benign

1.8

(source)

DANN

Benign

0.75

PhyloP100

0.24

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Mutation Taster

=100/0

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over