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Choosing Metaphases for Biological Dosimetry by Fluorescence In Situ Hybridization (FISH)

Abstract Edwards, A., Maznik, N., Moquet, J., Hone, P., Vinnikov, V., Lloyd, D. and Cox, R. Choosing Metaphases for Biological Dosimetry by Fluorescence In Situ Hybridization (FISH). Radiat. Res. 157, 469–471 (2002). Data are presented for a subset of lymphocytes characterized by FISH as missing painted chromosomal material. These lymphocytes occur in both control and irradiated subjects. These cells have a much greater frequency of one-way translocations than cells in which all of the painted chromosomal material is present. Their presence contributes to interindividual variability in control translocation yields. These cells do not appear to be more prevalent in persons exposed to high radiation doses. It is suggested that their exclusion when selecting cells for analysis may improve the sensitivity of FISH as a biological dosimeter at low doses. Mechanisms for the production of these one-way translocations in vivo are also discussed, with a proposal that their variable frequency in individuals may be consistent with exposure to chemical clastogens.