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Cytokinesis Block Micronucleus Cytome (CBMN Cyt) Assay Biomarkers and Their Association With Radiation Sensitivity Phenotype in Prostate Cancer Cases and DNA Repair Gene hOGG1 (C1245G) Polymorphism
Author(s) -
Dhillon Varinderpal S.,
Yeoh Eric,
Salisbury Carolyn,
Butters Julie,
Di Matteo Addolorata,
Olver Ian,
Fenech Michael
Publication year - 2018
Publication title -
environmental and molecular mutagenesis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1
H-Index - 87
eISSN - 1098-2280
pISSN - 0893-6692
DOI - 10.1002/em.22240
Subject(s) - micronucleus , micronucleus test , prostate cancer , genome instability , biology , chromosome instability , microbiology and biotechnology , cancer , genetics , dna damage , medicine , cancer research , dna , gene , toxicity , chromosome
Prostate cancer (PC) is commonly diagnosed cancer in men but only a few risk factors, such as family history, ethnicity, and age have been established. Chromosomal instability is another possible risk factor but this has not been adequately explained previously. In this study, we tested the hypotheses that peripheral blood lymphocytes (PBL) of PC patients have (1) an abnormally high level of chromosomal instability; (2) that they are hypersensitive to ionizing radiation‐induced DNA damage; and (3) that these phenotypes are affected by hOGG1 (C1245G) polymorphism. These experiments were performed using the cytokinesis‐block micronucleus Cytome (CBMN cyt) assay in PC cases and controls. We found that spontaneous or radiation‐induced (3G) micronucleus (MN) frequency is not significantly different between both groups. However, spontaneous frequency of nucleoplasmic bridges (NPBs) and radiation‐induced nuclear buds (NBuds) were significantly higher in patients vs. controls ( P < 0.0001; P = 0.0005, respectively). In addition, apoptosis and nuclear division index (NDI) was significantly higher in patients compared to controls after radiation treatment ( P = 0.006; P = 0.0002, respectively). Furthermore carriage of at least one G allele of hOGG1 (C1245G) polymorphism was associated with a significantly increased odds ratio (OR) to have a base‐line MN, NPB, or NBud frequency greater than medium level compared to homozygotes for C allele (OR:1.94, 1.77, 2.36, respectively, P = 0.02; 0.04, and 0.004, respectively). Our results support the hypotheses that those who develop PC have significantly higher level of genomic instability which is further increased in those who carry G allele of the hOGG1 (C1245G) polymorphism. Environ. Mol. Mutagen. 59:813–821, 2018. © 2018 Wiley Periodicals, Inc.