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Chromosomal aberrations in three successive cell cycles of Wallabia bicolor leukocytes after tritiated thymidine incorporation.

An analysis of the chromosomes of Wallabia bicolor over three successive cell cycles after incorporation of tritiated thymidine, has shown a substantial level of tritium-induced chromosomal aberrations in each cycle. Aberration levels are higher in second- than in first-division postlabel cells, and are still considerable in third-division cells. In chromosomes labeled along their entire length aberration frequency is correlated with metaphase length; in partly labeled chromosomes at the third cell cycle, aberrations are concentrated in labeled regions. These two findings indicate an intranuclear effect of tritium. Some cells with aberrant chromosomes survive into later divisions. There is little tendency for nonrandom association between chromosomes when aberrations are formed.