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Genetics, Vol 141, 1407-1424, Copyright © 1995
INVESTIGATIONS |
Prevalence of Localized Rearrangements vs. Transpositions Among Events Induced by Drosophila P Element Transposase on a P Transgene
M. Delattre, D. Anxolabehere and D. Coen
Department Dynamique du Genome et Evolution, Institut Jacques Monod, F-75251 Paris Cedex 05, France and Universite Pierre et Marie Curie (Paris 6), F-75252 Paris Cedex 05, France
We have studied P transposase-induced events on a P[w] transgene, P[w(d1)], harboring the whole white gene with a 3.44-kb direct duplication of its 5' regulatory sequences (containing the ZESTE-binding region, ZBR). We have recovered mutations leading to an increase or a decrease of zeste(1) repression, generally as the consequence of modifications of the number of ZBR in close physical proximity and/or jumps to other sites. We describe mutants displaying deletions of the original duplicated sequence or increases in the number of repeats from two to three or four. Internal deletions are more frequent than amplifications. Both require the integrity of P-element ends. We have also observed a high frequency of double P elements localized at the original P[w(d1)] insertion site. These double P elements are arranged in nonrandom configurations. We discuss the frequencies and the possible mechanisms leading to the various types of derivatives, in light of the current models for P excision and transposition. We propose that the P transposase induces mainly localized events. Some of these could result from frequent changes of template during gap-repair DNA synthesis, and/or from abortive transposition.
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