Abstract
The translocation t(12;22)(p13;q11) creates an MN1-TEL fusion gene leading to acute myeloid leukemia. MN1 is a transcription coactivator of the retinoic acid and vitamin D receptors, and TEL (ETV6) is a member of the E26-transformation-specific family of transcription factors. In MN1-TEL, the transactivating domains of MN1 are combined with the DNA-binding domain of TEL. We show that MN1-TEL inhibits retinoic acid receptor (RAR)-mediated transcription, counteracts coactivators such as p160 and p300, and acts as a dominant-negative mutant of MN1. Compared to MN1, the same transactivation domains in MN1-TEL are poorly stimulated by p160, p300 or histone deacetylase inhibitors, indicating that the block of RAR-mediated transcription by MN1-TEL is caused by dysfunctional transactivation domains rather than by recruitment of corepressors. The mechanism leading to myeloid leukemia in t(12;22) thus differs from the translocations that involve RAR itself.
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Acknowledgements
We thank Drs D Chen and R Eckner for permission to use RAC3 and p300 expression constructs, and E Korpershoek for providing POLR2A primers. This work was supported by Dutch Cancer Society Grants EUR 94-653 and 98-1778 and NCI Grant CA72999. KvW is supported by grant RyC-2004-1886 from the Spanish Ministry of Education and Science.
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van Wely, K., Meester-Smoor, M., Janssen, M. et al. The MN1-TEL myeloid leukemia-associated fusion protein has a dominant-negative effect on RAR-RXR-mediated transcription. Oncogene 26, 5733–5740 (2007). https://doi.org/10.1038/sj.onc.1210382
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DOI: https://doi.org/10.1038/sj.onc.1210382