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The Cajal body: a meeting place for spliceosomal snRNPs in the nuclear maze

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Abstract

Spliceosomal small nuclear ribonucleoprotein particles (snRNPs) are essential pre-mRNA splicing factors that consist of small nuclear RNAs (snRNAs) complexed with specific sets of proteins. A considerable body of evidence has established that snRNP assembly is accomplished after snRNA synthesis in the nucleus through a series of steps involving cytoplasmic and nuclear phases. Recent work indicates that snRNPs transiently localize to the Cajal body (CB), a nonmembrane-bound inclusion present in the nuclei of most cells, for the final steps in snRNP maturation, including snRNA base modification, U4/U6 snRNA annealing, and snRNA-protein assembly. Here, we review these findings that suggest a crucial role for CBs in the spliceosome cycle in which production of new snRNPs—and perhaps regenerated snRNPs after splicing—is promoted by the concentration of substrates in this previously mysterious subnuclear organelle. These insights allow us to speculate on the role of nuclear bodies in regulating the dynamics of RNP assembly to maintain a functional pool of factors available for key steps in gene expression.

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Acknowledgements

Work in our laboratories is supported by the Max Planck Society, a grant (to KMN) from the Deutsche Forschung Gemeinschaft (NE909/1-1), and grants (to DS) from Granting Agency of the Czech Republic (301/05/0601) and the Czech Ministry of Education (1K05009, MSM0021620806, AV0Z50110509 and LC535). We thank Christine Panagiotidis for help with graphics and Mirko Klingauf, Magda Strzelecka, and Arnold Kiss for helpful discussions and comments on the manuscript.

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  1. Department of Cellular Biology and Pathology, First Medical Faculty, Institute of Physiology, Charles University, Academy of Sciences of the Czech Republic, Albertov 4, Prague 2, 128 00, Czech Republic

    David Staněk

  2. Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, Dresden, 01307, Germany

    Karla M. Neugebauer

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  1. David Staněk
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  2. Karla M. Neugebauer
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Correspondence to David Staněk.

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Communicated by G. Matera

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Staněk, D., Neugebauer, K.M. The Cajal body: a meeting place for spliceosomal snRNPs in the nuclear maze. Chromosoma 115, 343–354 (2006). https://doi.org/10.1007/s00412-006-0056-6

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  • DOI: https://doi.org/10.1007/s00412-006-0056-6

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