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Genetics, Vol 141, 579-585, Copyright © 1995
INVESTIGATIONS |
Evidence for an Inducible Repair-Recombination System in the Female Germ Line of Drosophila melanogaster. II. Differential Sensitivity to Gamma Rays
A. Laurencon and J. C. Bregliano
Laboratoire de Genetique et Physiologie du Developpement, Marseille-Luminy, 13288 Marseille cedex 9, France
In a previous paper, we reported that the reactivity level, which regulates the frequency of transposition of I factor, a LINE element-like retrotransposon, is enhanced by the same agents that induce the SOS response in Escherichia coli. In this report, we describe experimental evidence that, for identical genotypes, the reactivity levels correlate with the sensitivity of oogenesis to gamma rays, measured by the number of eggs laid and by frequency of dominant lethals. This strongly supports the hypothesis that the reactivity level is one manifestation of an inducible DNA repair system taking place in the female germ line of Drosophila melanogaster. The implications of this finding for the understanding of the regulation of I factor are discussed and some other possible biological roles of this system are outlined.
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  C. de La Roche Saint Andre and J.-C. Bregliano Evidence for a Multistep Control in Transposition of I Factor in Drosophila melanogaster Genetics, April 1, 1998; 148(4): 1875 - 1884. [Abstract] [Full Text] [PDF]
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