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Chromosome Variation in Cell Populations Derived from Pig Kidney

A stable line of pig cells (PK) which has been in cultivation for 5 years has been used to study chromosomal variation. This cell line, together with its variously clonally derived sublines, has continued to possess a diploid component. Tetraploid and heteroploid components were also present. X-ray treatment of the P K cells produced a number of reciprocal translocations, resulting in chromosomes with unique morphology. Such chromosomes were extremely stable and conferred marker properties on populations which contained them. In the study of in vitro clones over a period of a year, it was found that while such populations are initially quite uniform, variation tends to increase with respect to distribution of chromosome number and different ploidy groups. In some instances, population heterogeneity could be attributed to the cloning procedure itself.