Abstract
It is now clear from in vitro studies that mutagens induce recombination in the cell, both homologous and nonhomologous exchanges. The recombination events induced are extrachromosomal events, exchanges between extrachromosomal DNA and chromosomes, and inter- as well as intrachromosomal exchanges. However, not all types of DNA damage can induce recombination. The mechanisms involved in the induction process are not known but may involve activation of DNA repair systems. In addition, stimulation of mRNA transcription by mutagens, different recombination pathways and how the assay system is constructed may affect the frequency and characteristics of the observed recombination events.
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