Abstract
DDX3X is a ubiquitously expressed RNA helicase involved in multiple stages of RNA biogenesis. DDX3X is frequently mutated in Burkitt lymphoma, but the functional basis for this is unknown. Here, we show that loss-of-function DDX3X mutations are also enriched in MYC-translocated diffuse large B cell lymphoma and reveal functional cooperation between mutant DDX3X and MYC. DDX3X promotes the translation of mRNA encoding components of the core translational machinery, thereby driving global protein synthesis. Loss-of-function DDX3X mutations moderate MYC-driven global protein synthesis, thereby buffering MYC-induced proteotoxic stress during early lymphomagenesis. Established lymphoma cells restore full protein synthetic capacity by aberrant expression of DDX3Y, a Y chromosome homolog, the expression of which is normally restricted to the testis. These findings show that DDX3X loss of function can buffer MYC-driven proteotoxic stress and highlight the capacity of male B cell lymphomas to then compensate for this loss by ectopic DDX3Y expression.
Original language | English |
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Pages (from-to) | 4059-4075.e11 |
Number of pages | 28 |
Journal | Molecular Cell |
Volume | 81 |
Issue number | 19 |
Early online date | 25 Aug 2021 |
DOIs | |
Publication status | Published - 7 Oct 2021 |
Bibliographical note
Funding Information:D.J.H. was supported by fellowships from the MRC (MR/M008584/1) and Cancer Research UK (CRUK) (RCCFEL∖100072). C.G. was supported by a fellowship from the Kay Kendall Leukaemia Fund (KKLF1398). J.A.K. was supported by a CRUK studentship (C9685/A25163). The Hodson laboratory is supported by Blood Cancer UK (grant ID 15022), the Kay Kendall Leukaemia Fund (KKL1144), the Evelyn Trust (ET19/27), and the Addenbrooke's Charitable Trust (900186). Research in the Hodson and Huntly laboratories was funded in part by the Wellcome Trust, which supported the Wellcome – MRC Cambridge Stem Cell Institute (203151/Z/16/Z) (for the purpose of Open Access, the author has applied a CC BY public copyright license to any author-accepted manuscript version arising from this submission), the CRUK Cambridge Major Centre (C49940/A25117), and the NIHR Cambridge Biomedical Research Centre (BRC-1215-20014) (the views expressed here are those of the authors and not necessarily those of the NIHR or the Department of Health and Social Care). B.J.H. was supported by CRUK (C18680/A25508) and the European Research Council (647685). Targeted lymphoma sequencing was funded by a grant from Blood Cancer UK to E.R. N.F.G. was funded by the Singapore National Medical Research Council (NMRC/TA/0051/2016). S.F. J.M. and S.D.T. were supported by the Alex Hume Foundation. J.U. was supported by the European Research Council under the European Union's Seventh Framework Programme (617837-Translate). The Francis Crick Institute receives its core funding from CRUK (FC001110), the UK Medical Research Council (FC001110), and the Wellcome Trust (FC001110). V.R. was supported by a Blood Cancer UK Senior Bennett Fellowship (12005) and the North East Promenaders Against Cancer (NEPAC), the JGW Patterson Foundation, and the Little Princess Trust. The Turner lab is supported by the BBSRC (BBS/E/B/000C0428) and a Wellcome Investigator award (200823/Z/16/Z). S.S. received core funding from the MRC (MC_UU_12022/10). We thank the patients, clinicians, and staff who participated in the collection of material and clinical data at the Children's Cancer and Leukaemia Group (CCLG) Tissue Bank. We are grateful to Joanna Baxter and Kay Elston from the Cambridge Blood and Stem Cell Bank and Alice Mitchell and Jessica Bewick from the ENT Department, Cambridge University Hospitals, for the supply of tonsil tissue. We thank Claudia Ribeiro de Almeida, George Vassiliou, and Graham Packham for critical reading of the manuscript. Graphical abstract was generated with BioRender.com.
Publisher Copyright:
© 2021 The Author(s)
Keywords
- Burkitt lymphoma
- DDX3X
- germinal center
- MYC
- proteotoxic stress
- RNA helicase
- translation
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology