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Schlosser, I. ; Hölzel, M. ; Mürnseer, M. ; Burtscher, H.* ; Weidle, U.H.* ; Eick, D.

A role for c-Myc in the regulation of ribosomal RNA processing.

Nucleic Acids Res. 31, 6148-6156 (2003)
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The proto-oncogene c-myc encodes a basic helix-loop-helix leucine zipper transcription factor (c-Myc) that has a profound role in growth control and cell cycle progression. Previous microarray studies identified various classes of c-Myc target genes, including genes involved in ribosome biogenesis. By screening the human B-cell line P493-6 and rat fibroblasts conditionally expressing c-Myc, we could substantially extend the list of c-Myc target genes, particularly those required for ribosome biogenesis. The identification of 38 new c-Myc target genes with nucleolar function, prompted us to investigate processing of ribosomal RNA (rRNA). Using pulse-chase labelling experiments we show that c-Myc regulates the efficiency of rRNA maturation. In serum-stimulated P493-6 cells, only the processing of the 47S rRNA precursor to mature 18S and 28S rRNA, but not the synthesis of the 47S transcript, was dependent on the presence of c-Myc. As processing of rRNA is sensitive to inhibition of cyclin-dependent kinase (cdk) activity by roscovitine, we conclude that c-Myc regulates cell growth and proliferation by the coordinated induction of cdk activity and rRNA processing.
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Publication type Article: Journal article
Document type Scientific Article
ISSN (print) / ISBN 0305-1048
e-ISSN 1362-4962
Quellenangaben Volume: 31, Issue: 21, Pages: 6148-6156 Article Number: , Supplement: ,
Publisher Oxford University Press
Reviewing status Peer reviewed