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[The use of the FISH method for the cytogenetic examination of persons with a history of acute radiation sickness in connection with the accident at the Chernobyl Atomic Electric Power Station].

We have performed conventional cytogenetics with group karyotyping and FISH analysis on metaphase-arrested lymphocyte cultured from 13 adults of 23 to 50 years. Twelve Chernobyl accident liquidators of 1986 year recovered from acute radiation sickness of the first (3 persons), second (7 persons) and third (2 persons) degree of severity; and one unexposed (control) person. A cocktail containing a balanced mix of directly-labeled by Spectrum orange whole-chromosome probes for human chromosomes 1,2 and 4 were used. Under the conventional staining the positive correlation between the frequency of chromosome type aberration (acentrics, dicentrics, centric rings, abnormal monocentrics) and the severity of irradiation was established even 10 years after radiation exposure. Under the FISH analysis the frequency of reciprocal translocation was in the range from 0.061 to 0.729 per cell which corresponded to doses of acute uniform irradiation from 0.8 till 3.48 Gy. The data obtained confirmed the validity of FISH as for quantifying stable chromosome aberrations in peripheral lymphocytes of irradiated persons as the high sensitivity of FISH for the retrospective dose evaluation in delayed terms after radiation exposure.