NDLI: Evolution of P Elements in Natural Populations of Drosophila willistoni and D. sturtevanti

Content Provider	PubMed Central
Author	Silva, Joana C. Kidwell, Margaret G.
Copyright Year	2004
Abstract	To determine how population structure of the host species affects the spread of transposable elements and to assess the strength of selection acting on different structural regions, we sequenced P elements from strains of Drosophila willistoni and Drosophila sturtevanti sampled from across the distributions of these species. Elements from D. sturtevanti exhibited considerable sequence variation, and similarity among them was correlated to geographic distance between collection sites. By contrast, all D. willistoni elements sampled were essentially identical (π < 0.2%) and exhibited patterns typical of a recent population expansion. While the canonical P elements sampled from D. sturtevanti appear to be long-time residents in that species, a rapid expansion of a very young canonical P-element lineage is suggested in D. willistoni, overcoming barriers such as large geographical distances and moderate levels of population subdivision. Between-species comparisons reveal selective constraints on P-element evolution, as indicated by significantly different substitution rates in noncoding, silent, and replacement sites. Most remarkably, in addition to replacement sites, selection pressure appears to be strong in the first and third introns and in the 3′ and 5′ flanking regions.
Related Links	http://dx.doi.org/10.1534/genetics.103.025775
Ending Page	1335
Page Count	13
Starting Page	1323
File Format	PDF
ISSN	00166731
Journal	Genetics
Issue Number	3
Volume Number	168
Language	English
Publisher	Genetics Society of America
Publisher Date	2004-11-01
Access Restriction	Open
Rights Holder	Genetics Society of America
Subject Keyword	Genetics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics

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