期刊
ENVIRONMENTAL AND MOLECULAR MUTAGENESIS
卷 56, 期 4, 页码 366-377出版社
WILEY
DOI: 10.1002/em.21924
关键词
PIG-A gene; mutation; flow cytometry; peripheral blood; CD59; CD55
资金
- National Institute of Health/National Institute of Environmental Health Sciences (NIEHS) [R44ES018017]
This laboratory has previously described a method for scoring the incidence of rodent blood Pig-a mutant phenotype erythrocytes using immunomagnetic separation in conjunction with flow cytometric analysis (In Vivo MutaFlow (R)). The current work extends this approach to human blood. The frequencies of CD59- and CD55-negative reticulocytes (RETCD59-/CD55-) and erythrocytes (RBCCD59-/CD55-) serve as phenotypic reporters of PIG-A gene mutation. Immunomagnetic separation was found to provide an effective means of increasing the number of reticulocytes and erythrocytes evaluated. Technical replicates were utilized to provide a sufficient number of cells for precise scoring while at the same time controlling for procedural accuracy by allowing comparison of replicate values. Cold whole blood samples could be held for at least one week without affecting reticulocyte, RETCD59-/CD55- or RBCCD59-/CD55- frequencies. Specimens from a total of 52 nonsmoking, self-reported healthy adult subjects were evaluated. The mean frequency of RETCD59-/CD55- and RBCCD59-/CD55- were 6.0 x 10(-6) and 2.9 x 10(-6), respectively. The difference is consistent with a modest selective pressure against mutant phenotype erythrocytes in the circulation, and suggests advantages of studying both populations of erythrocytes. Whereas intra-subject variability was low, inter-subject variability was relatively high, with RETCD59-/CD55- frequencies differing by more than 30-fold. There was an apparent correlation between age and mutant cell frequencies. Taken together, the results indicate that the frequency of human PIG-A mutant phenotype cells can be efficiently and reliably estimated using a labeling and analysis protocol that is well established for rodent-based studies. The applicability of the assay across species, its simplicity and statistical power, and the relatively non-invasive nature of the assay should benefit myriad research areas involving DNA damage, including studies of environmental factors that modify spontaneous mutation frequencies. Environ. Mol. Mutagen. 56:366-377, 2015. (c) 2014 Wiley Periodicals, Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据