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The accumulation of P-elements on the tip of the X chromosome in populations of Drosophila melanogaster

Published online by Cambridge University Press:  14 April 2009

James W. Ajioka  and
Walter F. Eanes
James W. Ajioka
Affiliation:
Department of Ecology and Evolution, State University of New York, Stony Brook, N.Y. 11794, USA
Walter F. Eanes*
Affiliation:
Department of Ecology and Evolution, State University of New York, Stony Brook, N.Y. 11794, USA
*
† Corresponding author.
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Little information exists about the mechanisms that determine the fate of mobile elements in natural populations. In this study we catalogue the distribution of 638 P-elements across 114 X chromosomes in samples drawn from three natural populations of Drosophila melanogaster. There is an extremely high occurrence of elements at the tip relative to the rest of the euchromatic chromosome. We demonstrate that the distribution of de novo insertions of the P-element on a specific laboratory chromosome is markedly different; no P-elements were recovered at the tip in the 243 insertion events recorded. In contrast, insertion data for the π2 chromosome suggests an elevated rate associated with the tip site although it does not appear sufficient to explain the large differential accumulation on wild chromosomes. This raises the issue of inter chromosome (or tip) variation in relative rates, as well as the possibility that rates of elimination are lower at the tip.

Information

Type
Research Article
Information
Genetics Research , Volume 53 , Issue 1 , February 1989 , pp. 1 - 6
Copyright
Copyright © Cambridge University Press 1989

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