| First Author | Belver L | Year | 2019 |
| Journal | Cancer Discov | Volume | 9 |
| Issue | 12 | Pages | 1774-1791 |
| PubMed ID | 31519704 | Mgi Jnum | J:281712 |
| Mgi Id | MGI:6379335 | Doi | 10.1158/2159-8290.CD-19-0471 |
| Citation | Belver L, et al. (2019) GATA3-Controlled Nucleosome Eviction Drives MYC Enhancer Activity in T-cell Development and Leukemia. Cancer Discov 9(12):1774-1791 |
| abstractText | Long-range enhancers govern the temporal and spatial control of gene expression; however, the mechanisms that regulate enhancer activity during normal and malignant development remain poorly understood. Here, we demonstrate a role for aberrant chromatin accessibility in the regulation of MYC expression in T-cell lymphoblastic leukemia (T-ALL). Central to this process, the NOTCH1-MYC enhancer (N-Me), a long-range T cell-specific MYC enhancer, shows dynamic changes in chromatin accessibility during T-cell specification and maturation and an aberrant high degree of chromatin accessibility in mouse and human T-ALL cells. Mechanistically, we demonstrate that GATA3-driven nucleosome eviction dynamically modulates N-Me enhancer activity and is strictly required for NOTCH1-induced T-ALL initiation and maintenance. These results directly implicate aberrant regulation of chromatin accessibility at oncogenic enhancers as a mechanism of leukemic transformation. SIGNIFICANCE: MYC is a major effector of NOTCH1 oncogenic programs in T-ALL. Here, we show a major role for GATA3-mediated enhancer nucleosome eviction as a driver of MYC expression and leukemic transformation. These results support the role of aberrant chromatin accessibility and consequent oncogenic MYC enhancer activation in NOTCH1-induced T-ALL.This article is highlighted in the In This Issue feature, p. 1631. |
