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The origin of P elements in Drosophila melanogaster

โœ Scribed by William R. Engels

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
764 KB
Volume
14
Category
Article
ISSN
0265-9247

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โœฆ Synopsis

The P family of transposable genetic elements is thought to be a recent addition to the Drosophila melanogaster genome. New evidence suggests that the elements came from another Drosophila species, possibly carried by parasitic mites. The transposition mechanism of P elements involves DNA gap repair which may have facilitated their rapid spread through D. melanogaster worldwide. These results provide new insight into the process of a transposon's invasion into a new species and the potential risk of extinction such an invasion might entail.

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## Abstract Ecdysteroid titers measured in the haemolymph of third instar larvae of __Drosophila__ revealed the existence of a small peak (40 ng/ml) preceding the major peak at pupariation. Under experimental conditions of delayed pupariation, the release of both ecdysteroid peaks is retarded. The