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Localization of pre-mRNA splicing in mammalian nuclei

Nature volume 372, pages 809–812 (1994)Cite this article

Abstract

IN mammalian nuclei, precursor messenger RNA splicing factors are distributed non-uniformly. Antibodies directed against struc-tural polypeptides of small nuclear ribonucleoprotein particles (snRNPs)1 and some non-snRNP splicing factors2 have shown that these components are concentrated in about 20-50 nuclear 'speckles'. These and other non-homogeneous distributions have been proposed to indicate nuclear 'compartments' that are distinct from the sites of transcription and in which RNA processing occurs3–9. We have tested this idea using a new approach. Previous structural10–13 and biochemical14–16 data have shown that splicing can occur in association with transcription. Nascent RNA of specific genes can be detected by in situ hybridization as intense spots of nuclear stain which map to the sites of transcription17–19. Here we identify active pre-mRNA splicing sites by localizing the nascent spliced mRNA of specific genes. We find that splicing occurs at the sites of transcription, which are not coincident with intranuclear speckles. We conclude that the nucleus is not compart-mentalized with respect to transcription and pre-mRNA splicing.

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Authors and Affiliations

  1. Howard Hughes Medical Institute, Program in Molecular Medicine, University of Massachusetts Medical Center, 373 Plantation Street, Worcester, Massachusetts, 01605, USA

    Guohong Zhang & Michael R. Green

  2. Department of Cell Biology, University of Massachusetts Medical Center, 373 Plantation Street, Worcester, Massachusetts, 01605, USA

    Krishan L. Taneja & Robert H. Singer

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  1. Guohong Zhang
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  3. Robert H. Singer
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  4. Michael R. Green
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Zhang, G., Taneja, K., Singer, R. et al. Localization of pre-mRNA splicing in mammalian nuclei. Nature 372, 809–812 (1994). https://doi.org/10.1038/372809a0

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