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Minor spliceosome components are predominantly localized in the nucleus

Lookup NU author(s): Dr Claudia SchneiderORCiD, Dr Nick Watkins


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Recently, it has been reported that there is a differential subcellular distribution of components of the minor U12-dependent and major U2-dependent spliceosome, and further that the minor spliceosome functions in the cytoplasm. To study the subcellular localization of the snRNA components of both the major and minor spliceosomes, we performed in situ hybridizations with mouse tissues and human cells. In both cases, all spliceosomal snRNAs were nearly exclusively detected in the nucleus, and the minor U11 and U12 snRNAs were further shown to colocalize with U4 and U2, respectively, in human cells. Additionally, we examined the distribution of several spliceosomal snRNAs and proteins in nuclear and cytoplasmic fractions isolated from human cells. These studies revealed an identical subcellular distribution of components of both the U12- and U2-dependent spliceosomes. Thus, our data, combined with several earlier publications, establish that, like the major spliceosome, components of the U12-dependent spliceosome are localized predominantly in the nucleus. © 2008 by The National Academy of Sciences of the USA.

Publication metadata

Author(s): Pessa HKJ, Will CL, Meng X, Schneider C, Watkins NJ, Perala N, Nymark M, Turunen JJ, Luhrmann R, Frilander MJ

Publication type: Article

Publication status: Published

Journal: Proceedings of the National Academy of Sciences of the United States of America

Year: 2008

Volume: 105

Issue: 25

Pages: 8655-8660

ISSN (print): 0027-8424

ISSN (electronic): 1091-6490

Publisher: National Academy of Sciences


DOI: 10.1073/pnas.0803646105

PubMed id: 18559850


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