title: CYP1A1 and GSTP1 gene variations in breast cancer: a systematic review and case-control study.
abstract: In first part of this study, a systematic review was designed to explore the involvement of CYP1A1 and GSTP1 genes in breast cancerogenesis. Based on systematic review, we designed a study to screen CYP1A1 and GSTP1 genes for mutation and their possible association with breast carcinogenesis. A total of 400 individuals were collected and analyzed by PCR-SSCP. After sequence analysis of coding region of CYP1A1 we identified eleven mutations in different exons of respective gene. Among these eleven mutations, ~3 folds increased breast cancer risk was found associated with Asp82Glu mutation (OR 2.99; 95% CI 1.26-7.09), with Ser83Thr mutation (OR 2.99; 95% CI 1.26-7.09) and with Glu86Ala mutation (OR 3.18; 95% CI 1.27-7.93) in cancer patients compared to controls. Furthermore, ~4 folds increase in breast cancer risk was found associated with Asp347Glu, Phe398Tyr and 5178delT mutations (OR 3.92; 95% CI 1.35-11.3) in patients compared to controls. The sequence analysis of GSTP1 resulted in identification of total five mutations. Among these five mutations, ~3 folds increase in breast cancer risk was observed associated with 1860G>A mutation, with 1861-1876delCAGCCCTCTGGAGTGG mutation (OR 2.70; 95% CI 1.10-6.62) and with 1861C>A mutation (OR 2.97; 95% CI 1.01-8.45) in cancer patients compared to controls. Furthermore, ~5 folds increase in breast cancer risk was associated with 1883G>T mutation (OR 4.75; 95% CI 1.46-15.3) and ~6 folds increase in breast cancer risk was found associated with Iso105Val mutation (OR 6.43; 95% CI 1.41-29.3) in cancer patients compared to controls. Our finding, based on systematic review and experimental data suggest that the polymorphic CYP1A1 and GSTP1 genes may contribute to risk of developing breast cancer.
authors.affiliation: Cancer Genetics Lab, Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, 44000, Pakistan.
authors.forename: Sumaira
authors.initials: S
authors.lastname: Akhtar
authors.affiliation: Cancer Genetics Lab, Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, 44000, Pakistan.
authors.forename: Ishrat
authors.initials: I
authors.lastname: Mahjabeen
authors.affiliation: Cancer Genetics Lab, Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, 44000, Pakistan.
authors.forename: Zertashia
authors.initials: Z
authors.lastname: Akram
authors.affiliation: Cancer Genetics Lab, Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, 44000, Pakistan. mkayani@comsats.edu.pk.
authors.forename: Mahmood Akhtar
authors.initials: MA
authors.lastname: Kayani
mesh_terms: D000328:Adult; D001943:Breast Neoplasms / Q000235:genetics*; D016022:Case-Control Studies; D019363:Cytochrome P-450 CYP1A1 / Q000235:genetics*; D005260:Female; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D051549:Glutathione S-Transferase pi / Q000235:genetics*; D006801:Humans; D008875:Middle Aged; D009154:Mutation; D010154:Pakistan; D011110:Polymorphism, Genetic; D018807:Polymorphism, Single-Stranded Conformational
chemical_list: C569463:CYP1A1 protein, human; D019363:Cytochrome P-450 CYP1A1; C496556:GSTP1 protein, human; D051549:Glutathione S-Transferase pi
keywords: Breast cancer; CYP1A1; GSTP1; Mutations; SSCP; Xenobiotic metabolizing pathway