Abstract
Burkitt’s lymphomas (BLs) acquire consistent point mutations in a conserved domain of Myc, Myc Box I. We report that the enhanced transforming activity of BL-associated Myc mutants can be uncoupled from loss of phosphorylation and increased protein stability. Furthermore, two different BL-associated Myc mutations induced similar gene expression profiles independently of T58 phosphorylation, and these profiles are dramatically different from MycWT. Nol5a/Nop56, which is required for ribosomal RNA methylation, was identified as a gene hyperactivated by the BL-associated Myc mutants. We show that Nol5a is necessary for Myc-induced cell transformation, enhances MycWT-induced cell transformation and increases the size of MycWT-induced tumors. Thus, Nol5a expands the link between Myc-induced regulation of nucleolar target genes, which are rate limiting for cell transformation and tumor growth.
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Acknowledgements
We thank Steve Hann and Chi Dang for providing cell lines. This project was supported by a grant from the National Cancer Institute (CA055248; MDC) and by Award Number T32GM008704 from the National Institute of General Medical Sciences (SAT). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of General Medical Sciences or the National Institutes of Health.
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Cowling, V., Turner, S. & Cole, M. Burkitt’s lymphoma-associated c-Myc mutations converge on a dramatically altered target gene response and implicate Nol5a/Nop56 in oncogenesis. Oncogene 33, 3519–3527 (2014). https://doi.org/10.1038/onc.2013.338
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DOI: https://doi.org/10.1038/onc.2013.338
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