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Journal of Cell Science, Vol 107, Issue 2 463-475, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
MC Azum-Gelade, J Noaillac-Depeyre, M Caizergues-Ferrer and N Gas
Laboratoire de Biologie Moleculaire des Eucaryotes (UPR 9006-CNRS), Toulouse, France.
The distribution of the U3 small nuclear RNA during the cell cycle of the CHO cell line was studied by in situ hybridization using digoxigenin-labelled oligonucleotide probes. The location of the hybrids by immunofluorescence microscopy and at the ultrastructural level was correlated with the distribution of two nucleolar proteins, nucleolin and fibrillarin. The U3 snRNA molecules persist throughout mitosis in close association with the nucleolar remnant. U3 snRNA is present in the prenucleolar bodies (PNBs) and could participate in nucleologenesis in association with several nucleolar proteins such as nucleolin and fibrillarin. The interaction of U3 snRNP with the 5' external spacer of pre-RNA newly synthesized by active NORs is proposed to be the promoting event of nucleologenesis.
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