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First published online 6 July 2005
doi: 10.1242/dev.01919
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1 Department of Molecular Genetics, University of Texas, M. D. Anderson Cancer
Center, Houston TX 77030, USA
2 Institute of Zoology, Jagiellonian University, ul. Ingardena 6, 30-060 Krakow,
Poland
3 Public Health Research Institute, Department of Molecular Genetics, 225 Warren
Street, Newark, NJ 07103, USA
* Author for correspondence (e-mail: lde{at}mdanderson.org)
Accepted 25 May 2005
The localization of RNA within a cell or embryo is crucial for proper cellular function or development. There is evidence that the cytoskeleton and RNA may function in the anchoring of localized RNAs at the vegetal cortex of Xenopus laevis oocytes. We found that the organization of the cytokeratin filaments but not the actin cytoskeleton depends on the presence of intact VegT mRNA and a noncoding RNA, Xlsirts. Destruction of either of these transcripts results in disruption of the cytokeratin cytoskeleton in a transcript-specific manner and interferes with proper formation of the germinal granules and subsequent development of the germline. Analysis of the distribution of endogenous VegT and Xlsirts in live oocytes using molecular beacons showed that these RNAs are integrated into the cytokeratin cytoskeleton. These results demonstrate a novel structural role of coding and noncoding RNAs in the organization of the vegetal cortex of Xenopus oocytes.
Key words: Localized RNA, Structural role of RNA, Cytokeratin, Germ plasm, Xenopus
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