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MBE Advance Access originally published online on May 18, 2005
Molecular Biology and Evolution 2005 22(9):1751-1763; doi:10.1093/molbev/msi169
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© The Author 2005. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org

Research Article

Unexpected Diversity and Differential Success of DNA Transposons in Four Species of Entamoeba Protozoans

Ellen J. Pritham1, Cédric Feschotte1 and Susan R. Wessler

Department of Plant Biology, The University of Georgia

E-mail: pritham{at}uta.edu.

We report the first comprehensive analysis of transposable element content in the compact genomes (~20 Mb) of four species of Entamoeba unicellular protozoans for which draft sequences are now available. Entamoeba histolytica and Entamoeba dispar, two human parasites, have many retrotransposons, but few DNA transposons. In contrast, the reptile parasite Entamoeba invadens and the free-living Entamoeba moshkovskii contain few long interspersed elements but harbor diverse and recently amplified populations of DNA transposons. Representatives of three DNA transposase superfamilies (hobo/Activator/Tam3, Mutator, and piggyBac) were identified for the first time in a protozoan species in addition to a variety of members of a fourth superfamily (Tc1/mariner), previously reported only from ciliates and Trichomonas vaginalis among protozoans. The diversity of DNA transposons and their differential amplification among closely related species with similar compact genomes are discussed in the context of the biology of Entamoeba protozoans.

Key Words: single-celled eukaryote • transposable element • asexual • Entamoeba • reverse transcriptase


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