ABSTRACT
PWP1 is a chromatin binding protein with an important role in animal growth control downstream of mTOR-mediated nutrient sensing. PWP1 has been shown to control tissue growth by promoting the transcription of 5.8S, 18S and 28S ribosomal RNAs (rRNAs) by RNA polymerase I (Pol I). Concomitantly with Pol I, RNA Polymerase III (Pol III) contributes to ribosome biogenesis by transcribing 5S rRNA in the nucleoplasm. Pol III activity is also closely controlled by nutrient-dependent signaling, however, how the activities of Pol I and Pol III are coordinated in response to nutrient-derived signals remains insufficiently understood. Experiments in Drosophila larvae and human cells reported here show that PWP1 associates with the chromatin at the 5S rDNA loci and is needed for nutrient-induced expression of 5S rRNA. Similar to the Pol I target rDNAs, PWP1 epigenetically maintains 5S rDNA in a transcription competent state. Thus, as a common regulator of Pol I and Pol III, PWP1 might contribute to coordinated control of ribosomal gene expression in response to nutrition.
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Footnotes
Competing interests
The authors declare no competing or financial interests.
Author contributions
Conceptualization: Y.L., V.H.; Methodology: Y.L., R.C.M., T.I.H.; Validation: Y.L., R.C.M.; Formal analysis: Y.L., R.C.M.; Investigation: Y.L., R.C.M.; Writing - original draft: Y.L., R.C.M., V.H.; Writing - review & editing: T.I.H.; Visualization: R.C.M.; Supervision: T.I.H., V.H.; Project administration: V.H.; Funding acquisition: V.H.
Funding
This study was supported by the Academy of Finland [286767], Sigrid Juselius Foundation and Novo Nordisk Foundation [NNF16OC0021460].
Supplementary information
Supplementary information available online at http://bio.biologists.org/lookup/doi/10.1242/bio.037911.supplemental
- Received August 20, 2018.
- Accepted October 3, 2018.
- © 2018. Published by The Company of Biologists Ltd
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.
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