title: Haplotypic association of DDAH1 with susceptibility to pre-eclampsia.
abstract: Association between pre-eclampsia (PEE1) and the dimethylarginine dimethylaminohydrolase (DDAH) 1 and 2 genes, which play a role in the regulation of nitric oxide synthesis and release, was studied. In a case-control study design single nucleotide polymorphisms (SNPs) were determined at eight sites in the DDAH1 gene and at one site (Pro231Pro) in the DDAH2 gene from 132 women with pre-eclampsia and 112 healthy controls. Three SNPs in the DDAH1 gene were associated with pre-eclampsia, showing complete linkage disequilibrium with each other, but none of the associations in the allele or genotype data reached statistical significance in either of the genes after the correction for multiple testing. Haplotype frequencies were estimated using a population based on a maximum likelihood method (EM algorithm). Four common DDAH1 haplotypes were present and a significant association of haplotypes H2 and H3 with pre-eclampsia (P=0.03) was found. The risk of pre-eclampsia was greatest in individuals (odds ratio: 3.93; 95% confidence interval: 1.54-9.99) who had two copies of the high-risk haplotypes (H2 or H3). The observed haplotypic association provides the first evidence of the importance of DDAH1 polymorphisms in pre-eclampsia susceptibility.
authors.affiliation: Department of Obstetrics and Gynaecology, Kuopio University Hospital, University of Kuopio, Kuopio, Finland.
authors.forename: Fareeza
authors.initials: F
authors.lastname: Akbar
authors.forename: Seppo
authors.initials: S
authors.lastname: Heinonen
authors.forename: Mia
authors.initials: M
authors.lastname: Pirskanen
authors.forename: Pekka
authors.initials: P
authors.lastname: Uimari
authors.forename: Tomi-Pekka
authors.initials: TP
authors.lastname: Tuomainen
authors.forename: Jukka T
authors.initials: JT
authors.lastname: Salonen
mesh_terms: D000328:Adult; D000581:Amidohydrolases / Q000235:genetics*; D016022:Case-Control Studies; D005260:Female; D005387:Finland; D020022:Genetic Predisposition to Disease; D006239:Haplotypes; D006801:Humans; D016013:Likelihood Functions; D015810:Linkage Disequilibrium; D020641:Polymorphism, Single Nucleotide; D011225:Pre-Eclampsia / Q000175:diagnosis / Q000235:genetics*; D011247:Pregnancy
chemical_list: D000581:Amidohydrolases; C059999:dimethylargininase