title: Genetic polymorphism of manganese superoxide dismutase (MnSOD) and breast cancer susceptibility.
abstract: Within mitochondria, manganese superoxide dismutase (MnSOD) provides a major defence against oxidative damage by reactive oxygen species (ROS). An alanine-9valine (Ala-9Val) polymorphism in the mitochondrial targeting sequence of MnSOD has been described and has recently been associated with risk of human breast cancer. Our present case-control study was performed to explore the association between MnSOD genetic polymorphism and individual susceptibility to breast cancer. Ala-9Val polymorphism in the signal sequence of the protein for MnSOD was determined using the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay in a study population. There was no significant difference in risk for breast cancer development between patients positive and negative for the MnSOD Ala allele with adjusted odds ratio (OR): 0.86 (95% confidence interval (CI(0.43 to 1.72). When MnSOD Ala was combined with either cytochrome P450 1B1 CYP1B1*1 and catechol O-methyltransferase COMT-L (V158M) genotypes, the risk for developing breast cancer was significantly increased in patients with a body mass index (BMI) greater than 24 kg m(-2) (OR: 1.42 (95%CI=1.04-1.93)).
authors.affiliation: Department of Toxicology, University of Gazi, Pharmacy Faculty, Ankara, Turkey. neslihan@gazi.edu.tr
authors.forename: Neslihan Aygün
authors.initials: NA
authors.lastname: Kocabaş
authors.forename: Semra
authors.initials: S
authors.lastname: Sardaş
authors.forename: Suzanne
authors.initials: S
authors.lastname: Cholerton
authors.forename: Ann K
authors.initials: AK
authors.lastname: Daly
authors.forename: Atilla H
authors.initials: AH
authors.lastname: Elhan
authors.forename: Ali Esat
authors.initials: AE
authors.lastname: Karakaya
mesh_terms: D000483:Alleles; D001943:Breast Neoplasms / Q000201:enzymology* / Q000453:epidemiology / Q000235:genetics*; D016022:Case-Control Studies; D004247:DNA / Q000235:genetics; D005260:Female; D005787:Gene Frequency / Q000235:genetics; D020022:Genetic Predisposition to Disease; D014644:Genetic Variation; D005838:Genotype; D006801:Humans; D016017:Odds Ratio; D011110:Polymorphism, Genetic; D013482:Superoxide Dismutase / Q000235:genetics*; D014421:Turkey / Q000453:epidemiology
chemical_list: D004247:DNA; D013482:Superoxide Dismutase