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Genetics, Vol 141, 571-578, Copyright © 1995
INVESTIGATIONS |
Evidence for an Inducible Repair-Recombination System in the Female Germ Line of Drosophila melanogaster. I. Induction by Inhibitors of Nucleotide Synthesis and by Gamma Rays
J. C. Bregliano, A. Laurencon and F. Degroote
Laboratoire de Genetique et Physiologie du Developpement, Marseille-Luminy, 13288 Marseille cedex 9, France
In the I-R system of hybrid dysgenesis in Drosophila melanogaster, the transposition frequency of I factor, a LINE element-like retrotransposon, is regulated by the reactivity level of the R mother. This reactivity is a cellular state maternally inherited but chromosomally determined, which has been shown to undergo heritable, cumulative and reversible changes with aging and some environmental conditions. We propose the hypothesis that this reactivity level is one manifestation of an inducible repair-recombination system whose biological role might be analogous to the SOS response in bacteria. In this paper, we show that inhibitors of DNA synthesis and gamma rays enhance the reactivity level in a very similar way. This enhancement is heritable, cumulative and reversible.
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