Abstract
Overexpression of the BRE (brain and reproductive organ-expressed) gene defines a distinct pediatric and adult acute myeloid leukemia (AML) subgroup. Here we identify a promoter enriched for active chromatin marks in BRE intron 4 causing strong biallelic expression of a previously unknown C-terminal BRE transcript. This transcript starts with BRE intron 4 sequences spliced to exon 5 and downstream sequences, and if translated might code for an N terminally truncated BRE protein. Remarkably, the new BRE transcript was highly expressed in over 50% of 11q23/KMT2A (lysine methyl transferase 2A)-rearranged and t(8;16)/KAT6A-CREBBP cases, while it was virtually absent from other AML subsets and normal tissues. In gene reporter assays, the leukemia-specific fusion protein KMT2A-MLLT3 transactivated the intragenic BRE promoter. Further epigenome analyses revealed 97 additional intragenic promoter marks frequently bound by KMT2A in AML with C-terminal BRE expression. The corresponding genes may be part of a context-dependent KMT2A-MLLT3-driven oncogenic program, because they were higher expressed in this AML subtype compared with other groups. C-terminal BRE might be an important contributor to this program because in a case with relapsed AML, we observed an ins(11;2) fusing CHORDC1 to BRE at the region where intragenic transcription starts in KMT2A-rearranged and KAT6A-CREBBP AML.
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Acknowledgements
We thank Dr Robert Slany for kindly sharing the pGL3-Hoxa7 promoter plasmid. This work was supported by the Radboud University Medical Center for Oncology, the Dutch Cancer Foundation (KUN 2011-4937) and the European Union’s Seventh Framework Programme (FP5/2007-2013, 282510-BLUEPRINT).
Author contributions
AEM, KHMP, BAR and JHAM coordinated research and wrote the manuscript. AEM, KHMP and SMB conducted and analyzed most experiments. KHMP, EMJM, BK, NS, MLY, JK, HGS and JHAM contributed to ChIP-seq and RNA-sequencing of KMT2A-MLLT3 samples (BLUEPRINT consortium). KHMP, NT and MAS did bioinformatic analyses. ASAAH, ECGS, JK, MAS and PJMV detected CHORDC1-BRE fusion. TCJMA-P, CMZ, HGS, MMH-E, TH, MF, JHJ, PJMV, BAR and JHM provided patient samples and funding. All authors critically revised the paper and approved the final version.
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Marneth, A., Prange, K., Al Hinai, A. et al. C-terminal BRE overexpression in 11q23-rearranged and t(8;16) acute myeloid leukemia is caused by intragenic transcription initiation. Leukemia 32, 828–836 (2018). https://doi.org/10.1038/leu.2017.280
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DOI: https://doi.org/10.1038/leu.2017.280
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