title: Maternal genetic polymorphisms in CYP1A1, GSTM1 and GSTT1 and the risk of hypospadias.
abstract: Hypospadias is one of the most common congenital anomalies. Increased exposure to environmental factors (endocrine-disrupting chemicals and smoking) or maternal endogenous estrogen may cause hypospadias because male sexual differentiation is dependent on normal androgen homeostasis. Moreover, interactions between genetic factors and cigarette smoking and other chemicals have been suggested. It has been demonstrated that the CYP1A1 metabolizes not only environmental chemicals but also estrogens, and glutathione-S-transferases (GSTs) are detoxification enzymes that protect cells from toxicants by conjugation with glutathione. In this study, to investigate the association of CYP1A1 (MspI), GSTM1 and GSTT1 polymorphisms with hypospadias, a case-control study of 31 case mothers who had boys with hypospadias and 64 control mothers was performed in Japan. These polymorphisms were investigated by PCR-based methods using DNA from peripheral lymphocytes. We found that the heterozygous CYP1A1 and heterozygous and homozygous CYP1A1 were less frequent in the case mothers than in the control mothers [adjusted odds ratio (OR)=0.17, 95% confidence interval (CI)=0.04-0.74, OR = 0.28, 95% CI = 0.08-0.97, respectively]. We found no effect of maternal smoking on the hypospadias risks among the gene polymorphisms. The results suggest that mothers with the CYP1A1 MspI variant allele may have a decreased risk for hypospadias.
authors.affiliation: Department of Public Health, Hokkaido University Graduate School of Medicine, Kita 15, Nishi 7, Kita-ku, Sapporo 060-8638, Japan. noriek@med.hokudai.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Kurahashi
authors.forename: F
authors.initials: F
authors.lastname: Sata
authors.forename: S
authors.initials: S
authors.lastname: Kasai
authors.forename: T
authors.initials: T
authors.lastname: Shibata
authors.forename: K
authors.initials: K
authors.lastname: Moriya
authors.forename: H
authors.initials: H
authors.lastname: Yamada
authors.forename: H
authors.initials: H
authors.lastname: Kakizaki
authors.forename: H
authors.initials: H
authors.lastname: Minakami
authors.forename: K
authors.initials: K
authors.lastname: Nonomura
authors.forename: R
authors.initials: R
authors.lastname: Kishi
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D002648:Child; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005982:Glutathione Transferase / Q000235:genetics; D006801:Humans; D007021:Hypospadias / Q000235:genetics*; D007564:Japan; D008297:Male; D012150:Polymorphism, Restriction Fragment Length; D012307:Risk Factors; D012907:Smoking; D011795:Surveys and Questionnaires
chemical_list: D019363:Cytochrome P-450 CYP1A1; D005982:Glutathione Transferase; C413545:glutathione S-transferase T1