Chromosome aberrations induced by aphidicolin.
The expression of aphidicolin (apc)-produced common fragile sites and chromosome aberrations observed 24 h after apc treatment was studied in a normal individual. The chromosome lesions (gaps and breaks) induced by apc are expressed as full chromosomal aberrations in later cell divisions. We compared chromosome rearrangements or anomalies induced by apc (detected in 45.4% of metaphases analyzed) with those present in human neoplasia or involved in primate evolution. We found that 55.7% of deletions observed in our study coincided with deletions implicated in several types of neoplasia. However, none of 49 translocations observed in our study coincided with those described as recurrently associated with human neoplasia, probably due to their unbalanced nature. When chromosome aberrations detected in our study (only deletions and inversions were taken into account) were compared to those involved in primate evolution, we found a low rate of coincidence. The low coincidence between chromosome alterations in neoplasia and evolution and those observed in our study could be explained because we analyzed chromosome alterations that had not been selected, whereas those present in chromosome evolution and in neoplasia had been subjected to a selection process.