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Published online before print August 16, 2001, 10.1101/gr.164201
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Vol. 11, Issue 9, 1527-1540, September 2001

LETTER
Drosophila Euchromatic LTR Retrotransposons are Much Younger Than the Host Species in Which They Reside

Nathan J. Bowen,1 and John F. McDonald2

Department of Genetics, University of Georgia, Athens, Georgia 30602, USA

The recent release of the complete euchromatic genome sequence of Drosophila melanogaster offers a unique opportunity to explore the evolutionary history of transposable elements (TEs) within the genome of a higher eukaryote. In this report, we describe the annotation and phylogenetic comparison of 178 full-length long terminal repeat (LTR) retrotransposons from the sequenced component of the D. melanogaster genome. We report the characterization of 17 LTR retrotransposon families described previously and five newly discovered element families. Phylogenetically, these families can be divided into three distinct lineages that consist of members from the canonical Copia and Gypsy groups as well as a newly discovered third group containing BEL, mazi, and roo elements. Each family consists of members with average pairwise identities >= 99% at the nucleotide level, indicating they may be the products of recent transposition events. Consistent with the recent transposition hypothesis, we found that 70% (125/178) of the elements (across all families) have identical intra-element LTRs. Using the synonymous substitution rate that has been calculated previously for Drosophila (.016 substitutions per site per million years) and the intra-element LTR divergence calculated here, the average age of the remaining 30% (53/178) of the elements was found to be 137,000 ±89,000 yr. Collectively, these results indicate that many full-length LTR retrotransposons present in the D. melanogaster genome have transposed well after this species diverged from its closest relative Drosophila simulans, 2.3 ± .3 million years ago.


1 Present Address: Section on Eukaryotic Transposable Elements, Laboratory of Gene Regulation and Development, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.

2 Corresponding author.


11:1527-1540 ©2001 by Cold Spring Harbor Laboratory Press  ISSN 1088-9051/01 $5.00

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