Diagenode

A NOTCH1-driven MYC enhancer promotes T cell development, transformation and acute lymphoblastic leukemia.


Herranz D, Ambesi-Impiombato A, Palomero T, Schnell SA, Belver L, Wendorff AA, Xu L, Castillo-Martin M, Llobet-Navás D, Cordon-Cardo C, Clappier E, Soulier J, Ferrando AA

Efforts to identify and annotate cancer driver genetic lesions have been focused primarily on the analysis of protein-coding genes; however, most genetic abnormalities found in human cancer are located in intergenic regions. Here we identify a new long range-acting MYC enhancer controlled by NOTCH1 that is targeted by recurrent chromosomal duplications in human T cell acute lymphoblastic leukemia (T-ALL). This highly conserved regulatory element, hereby named N-Me for NOTCH MYC enhancer, is located within a broad super-enhancer region +1.47 Mb from the MYC transcription initiating site, interacts with the MYC proximal promoter and induces orientation-independent MYC expression in reporter assays. Moreover, analysis of N-Me knockout mice demonstrates a selective and essential role of this regulatory element during thymocyte development and in NOTCH1-induced T-ALL. Together these results identify N-Me as a long-range oncogenic enhancer implicated directly in the pathogenesis of human leukemia and highlight the importance of the NOTCH1-MYC regulatory axis in T cell transformation and as a therapeutic target in T-ALL.

Tags
Bioruptor
Chromatin Shearing
ChIP-qPCR

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Published
October, 2014

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