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MBE Advance Access originally published online on November 7, 2008
Molecular Biology and Evolution 2009 26(2):375-383; doi:10.1093/molbev/msn260
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© The Author 2008. 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@oxfordjournals.org

Research Articles

Degenerate Tetraploidy Was Established Before Bdelloid Rotifer Families Diverged

Jae H. Hur*, Karine Van Doninck*,{dagger}, Morgan L. Mandigo*,{ddagger} and Matthew Meselson*

* Department of Molecular and Cellular Biology, Harvard University
{dagger} Department of Biology, University of Namur (FUNDP), URBO, Namur, Belgium
{ddagger} Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD

E-mail: msm{at}wjh.harvard.edu.

Accepted for publication November 3, 2008.

Rotifers of Class Bdelloidea are abundant freshwater invertebrates known for their remarkable ability to survive desiccation and their lack of males and meiosis. Sequencing and annotation of approximately 50-kb regions containing the four hsp82 heat shock genes of the bdelloid Philodina roseola, each located on a separate chromosome, have suggested that its genome is that of a degenerate tetraploid. In order to determine whether a similar structure exists in a bdelloid distantly related to P. roseola and if degenerate tetraploidy was established before the two species separated, we sequenced regions containing the hsp82 genes of a bdelloid belonging to a different family, Adineta vaga, and the histone gene clusters of P. roseola and A. vaga. Our findings are entirely consistent with degenerate tetraploidy and show that it was established before the two bdelloid families diverged and therefore probably before the bdelloid radiation.

Key Words: hsp82 • histone gene cluster • Adineta vaga • Philodina roseola

Martin Embley, Associate Editor


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