NDLI: In vivo detection of snRNP-rich organelles in the nuclei of mammalian cells.

Content Provider	PubMed Central
Author	Carmo-fonseca, M. Pepperkok, R. Sproat, B. S. Ansorge, W. Swanson, M. S. Lamond, A. I.
Abstract	The in vivo distribution of snRNPs has been analysed by microinjecting fluorochrome-labelled antisense probes into the nuclei of live HeLa and 3T3 cells. Probes for U2 and U5 snRNAs specifically label the same discrete nuclear foci while a probe for U1 snRNA shows widespread nucleoplasmic labelling, excluding nucleoli, in addition to labelling foci. A probe for U3 snRNA specifically labels nucleoli. These in vivo data confirm that mammalian cells have nuclear foci which contain spliceosomal snRNPs. Co-localization studies, both in vivo and in situ, demonstrate that the spliceosomal snRNAs are present in the same nuclear foci. These foci are also stained by antibodies which recognize snRNP proteins, m3G-cap structures and the splicing factor U2AF but are not stained by anti-SC-35 or anti-La antibodies. U1 snRNP and the splicing factor U2AF closely co-localize in the nucleus, both before and after actinomycin D treatment, suggesting that they may both be part of the same complex in vivo.
Starting Page	1863
File Format	PDF
ISSN	14602075
e-ISSN	14602075
Journal	The EMBO Journal
Issue Number	7
Volume Number	10
Language	English
Publisher Date	1991-07-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience Immunology and Microbiology Medicine Molecular Biology

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In vivo detection of snRNP-rich organelles in the nuclei of mammalian cells.