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Meiotic chromosomal translocations in male induced by X-irradiation.

The dose-response curve for reciprocal translocations induced by acute exposure of spermatogonial stem cells to X-rays in treated mice and their F-1 sons was examined. Male mice were totally irradiated with doses of 1 Gy; 5 X 1 Gy and 5 Gy. The obtained results show that frequency of the chromosomal translocations in directly treated animals is dose dependent. The percentage of animals irradiated with 1 Gy which had the chromosomal translocations was 60, while this percentage in animals irradiated with single and fractionated dose of 5 Gy was 100. The frequency of chromosomal translocations varies from 1.5% to 8.0%. Multivalent configurations in F-1 males were observed after exposure to 5 Gy only. The incidence of F-1 translocated males was 17.5%.