Analysis of the MTHFD1 promoter and risk of neural tube defects.

Abstract:

:Genetic variants in MTHFD1 (5,10-methylenetetrahydrofolate dehydrogenase/5,10-methenyltetrahydrofolate cyclohydrolase/ 10-formyltetrahydrofolate synthetase), an important folate metabolic enzyme, are associated with a number of common diseases, including neural tube defects (NTDs). This study investigates the promoter of the human MTHFD1 gene in a bid to understand how this gene is controlled and regulated. Following a combination of in silico and molecular approaches, we report that MTHFD1 expression is controlled by a TATA-less, Initiator-less promoter and transcription is initiated at multiple start sites over a 126 bp region. We confirmed the presence of three database polymorphisms (dbSNP) by direct sequencing of the upstream region (rs1076991 C > T, rs8010584 G > A, rs4243628 G > T), with a fourth (dbSNP rs746488 A > T) not found to be polymorphic in our population and no novel polymorphisms identified. We demonstrate that a common SNP rs1076991 C > T within the window of transcriptional initiation exerts a significant effect on promoter activity in vitro. We investigated this SNP as a potential risk factor for NTDs in a large homogenous Irish population and determined that it is not an independent risk factor, but, it does increase both case (chi (2) = 11.06, P = 0.001) and maternal (chi (2) = 6.68, P = 0.01) risk when allele frequencies were analysed in combination with the previously identified disease-associated p.R653Q (c.1958 G > A; dbSNP rs2236225) polymorphism. These results provide the first insight into how MTHFD1 is regulated and further emphasise its importance during embryonic development.

journal_name

Hum Genet

journal_title

Human genetics

authors

Carroll N,Pangilinan F,Molloy AM,Troendle J,Mills JL,Kirke PN,Brody LC,Scott JM,Parle-McDermott A

doi

10.1007/s00439-008-0616-3

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

247-56

issue

3

eissn

0340-6717

issn

1432-1203

journal_volume

125

pub_type

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