P-element-induced recombination in Drosophila melanogaster: hybrid element insertion.
It has previously been shown that the combination of two deleted P elements in trans, one containing the left functional end and the second element the right functional end, can lead to high levels of male recombination. This finding strongly suggests that P-element ends from different chromosomes can become associated, followed by "pseudo-excision". We show that two different processes are involved in resolving the pseudo-excision event: (1) the excised P-element ends continue to function as a single unit (Hybrid Element) and insert at a nearby site in the chromosome or into the element itself [Hybrid Element Insertion (HEI)] and (2) free ends that do not contain P elements repair and rejoin [(Hybrid Excision and Repair (HER)]. Both types of resolution can lead to recombination, and this paper concentrates on the HEI class. One type of HEI event predicts the exact reverse complementary duplication of an 8-bp target site, and we have confirmed the existence of such a structure in six independently derived recombinant chromosomes. There is also a high tendency for insertion events to occur within a few bases of the original 8-bp target site, including six apparent cases of insertion into the exact site.
Gray
Y H
YH
School of Biological Sciences, University of Sydney, New South Wales, Australia.
Tanaka
M M
MM
Sved
J A
JA
D000818:Animals; D004251:DNA Transposable Elements / Q000235:genetics*; D004331:Drosophila melanogaster / Q000235:genetics*; D005260:Female; D005786:Gene Expression Regulation; D008297:Male; D011995:Recombination, Genetic
D004251:DNA Transposable Elements