Genetic Variant MTHFR:c.*174delT (chr1-11790505-CA-C) – ACMG Classification: Likely_benign (-5 pts)

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BS1_SupportingBS2

The NM_005957.5(MTHFR):c.*174delT variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00179 in 1,432,314 control chromosomes in the GnomAD database, including 5 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0011 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0019 ( 5 hom. )

Consequence

MTHFR
NM_005957.5 3_prime_UTR

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -2.27

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 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00114 (174/152340) while in subpopulation NFE AF = 0.00228 (155/68026). AF 95% confidence interval is 0.00199. There are 0 homozygotes in GnomAd4. There are 81 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 5 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MTHFR	NM_005957.5 link	c.*174delT		3_prime_UTR_variant	Exon 12 of 12	ENST00000376590.9	NP_005948.3	P42898-1Q8IU67Q59GJ6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MTHFR	ENST00000376590.9 link	c.*174delT		3_prime_UTR_variant	Exon 12 of 12	1	NM_005957.5	ENSP00000365775.3		P42898-1

Frequencies

GnomAD3 genomes

AF:

0.00114

AC:

174

AN:

152222

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000338

Gnomad AMI

AF:

0.00110

Gnomad AMR

AF:

0.000196

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00228

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00186

AC:

2385

AN:

1279974

Hom.:

Cov.:

AF XY:

0.00181

AC XY:

1130

AN XY:

623090

show subpopulations

African (AFR)

AF:

0.000142

AC:

AN:

28154

American (AMR)

AF:

0.000423

AC:

AN:

21266

Ashkenazi Jewish (ASJ)

AF:

0.0000525

AC:

AN:

19048

East Asian (EAS)

AF:

0.00

AC:

AN:

34988

South Asian (SAS)

AF:

0.00

AC:

AN:

63520

European-Finnish (FIN)

AF:

0.000257

AC:

AN:

31112

Middle Eastern (MID)

AF:

0.000277

AC:

AN:

3608

European-Non Finnish (NFE)

AF:

0.00224

AC:

2295

AN:

1024980

Other (OTH)

AF:

0.00126

AC:

AN:

53298

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.505

Heterozygous variant carriers

128

256

384

512

640

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00114

AC:

174

AN:

152340

Hom.:

Cov.:

AF XY:

0.00109

AC XY:

AN XY:

74494

show subpopulations

African (AFR)

AF:

0.000337

AC:

AN:

41586

American (AMR)

AF:

0.000196

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.0000942

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00228

AC:

155

AN:

68026

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00140

Hom.:

Bravo

AF:

0.00114

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Neural tube defects, folate-sensitive

Uncertain:1

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

-2.3

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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1-11790505-CA-C

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over