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Nucleic Acids Research 2006 34(9):2676-2685; doi:10.1093/nar/gkl359
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Published online 19 May 2006

© The Author 2006. Published by Oxford University Press. All rights reserved
The online version of this article has been published under an open access model. Users are entitled to use, reproduce, disseminate, or display the open access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and Oxford University Press are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact journals.permissions@oxfordjournals.org

Article

Evolution of small nucleolar RNAs in nematodes

Anja Zemann, Anja op de Bekke, Martin Kiefmann, Jürgen Brosius and Jürgen Schmitz

Institute of Experimental Pathology (ZMBE), University of Münster D-48149 Münster, Germany

*To whom correspondence should be addressed. Tel: +49 251 8352133; Fax: +49 251 8352134; Email: jueschm{at}uni-muenster.de

Received March 24, 2006. Revised April 11, 2006. Accepted April 24, 2006.

In contrast to mRNAs, which are templates for translating proteins, non-protein coding (npc) RNAs (also known as ‘non-coding’ RNA, ncRNA), exhibit various functions in different compartments and developmental stages of the cell. Small nucleolar RNAs (snoRNAs), one of the largest classes of npcRNAs, guide post-transcriptional modifications of other RNAs that are crucial for appropriate RNA folding as well as for RNA–RNA and RNA–protein interactions. Although snoRNA genes comprise a significant fraction of the eutherian genome, identifying and characterizing large numbers of them is not sufficiently accessible by classical computer searches alone. Furthermore, most previous investigations of snoRNAs yielded only limited indications of their evolution. Using data obtained by a combination of high-throughput cDNA library screening and computational search strategies based on a modified DNAMAN program, we characterized 151 npcRNAs, and in particular 121 snoRNAs, from Caenorhabditis elegans and extensively compared them with those in the related, Caenorhabditis briggsae. Detailed comparisons of paralog snoRNAs in the two nematodes revealed, in addition to trans-duplication, a novel, cis-duplication distribution strategy with insertions near to the original loci. Some snoRNAs coevolved with their modification target sites, demonstrating the close interaction of complementary regions. Some target sites modified by snoRNAs were changed, added or lost, documenting a high degree of evolutionary plasticity of npcRNAs.


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