Amino acid-dependent signaling via S6K1 and MYC is essential for regulation of rDNA transcription
AuthorKang, J; Kusnadi, EP; Ogden, AJ; Hicks, RJ; Bammert, L; Kutay, U; Hung, S; Sanij, E; Hannan, RD; Hannan, KM; ...
PublisherIMPACT JOURNALS LLC
University of Melbourne Author/sSanij, Elaine; Hannan, Ross; Pearson, Richard; Hannan, Katherine; Hicks, Rodney; Kusnadi, Eric; Hung, Sandy; Kusnadi, Eric
AffiliationSir Peter MacCallum Department of Oncology
Medicine and Radiology
Biochemistry and Molecular Biology
Ophthalmology (Eye & Ear Hospital)
Document TypeJournal Article
CitationsKang, J., Kusnadi, E. P., Ogden, A. J., Hicks, R. J., Bammert, L., Kutay, U., Hung, S., Sanij, E., Hannan, R. D., Hannan, K. M. & Pearson, R. B. (2016). Amino acid-dependent signaling via S6K1 and MYC is essential for regulation of rDNA transcription. ONCOTARGET, 7 (31), pp.48887-48904. https://doi.org/10.18632/oncotarget.10346.
Access StatusOpen Access
Dysregulation of RNA polymerase I (Pol I)-dependent ribosomal DNA (rDNA) transcription is a consistent feature of malignant transformation that can be targeted to treat cancer. Understanding how rDNA transcription is coupled to the availability of growth factors and nutrients will provide insight into how ribosome biogenesis is maintained in a tumour environment characterised by limiting nutrients. We demonstrate that modulation of rDNA transcription initiation, elongation and rRNA processing is an immediate, co-regulated response to altered amino acid abundance, dependent on both mTORC1 activation of S6K1 and MYC activity. Growth factors regulate rDNA transcription initiation while amino acids modulate growth factor-dependent rDNA transcription by primarily regulating S6K1-dependent rDNA transcription elongation and processing. Thus, we show for the first time amino acids regulate rRNA synthesis by a distinct, post-initiation mechanism, providing a novel model for integrated control of ribosome biogenesis that has implications for understanding how this process is dysregulated in cancer.
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