TY - JOUR
T1 - Aberrant TAL1 activation is mediated by an interchromosomal interaction in human T-cell acute lymphoblastic leukemia
AU - Patel, B.
AU - Kang, Y.
AU - Cui, K.
AU - Litt, M.
AU - Riberio, M. S.J.
AU - Deng, C.
AU - Salz, T.
AU - Casada, S.
AU - Fu, X.
AU - Qiu, Y.
AU - Zhao, K.
AU - Huang, S.
N1 - Funding Information:
We are grateful to members of the Huang laboratory for their suggestions and comments. We thank Drs Christopher Cogle and Zhixiong Xu for generously providing T-ALL samples and for their advice on the 4C assay. This work was supported by grants from the National Institute of Health (SH, R01HL090589, R01HL091929 and R01HL091929-01A1S1-the ARRA Administrative supplement; YQ, R01HL095674; BP, 5T32CA009126-35). KZ is supported by the Intramural Research programs, the National Heart Lung Blood Institute, and the National Institute of Health.
PY - 2014/2
Y1 - 2014/2
N2 - Long-range chromatin interactions control metazoan gene transcription. However, the involvement of intra-and interchromosomal interactions in development and oncogenesis remains unclear. TAL1/SCL is a critical transcription factor required for the development of all hematopoietic lineages; yet, aberrant TAL1 transcription often occurs in T-cell acute lymphoblastic leukemia (T-ALL). Here, we report that oncogenic TAL1 expression is regulated by different intra-and interchromosomal loops in normal hematopoietic and leukemic cells, respectively. These intra-and interchromosomal loops alter the cell-type-specific enhancers that interact with the TAL1 promoter. We show that human SET1 (hSET1)-mediated H3K4 methylations promote a long-range chromatin loop, which brings the +51 enhancer in close proximity to TAL1 promoter 1 in erythroid cells. The CCCTC-binding factor (CTCF) facilitates this long-range enhancer/promoter interaction of the TAL1 locus in erythroid cells while blocking the same enhancer/promoter interaction of the TAL1 locus in human T-cell leukemia. In human T-ALL, a T-cell-specific transcription factor c-Maf-mediated interchromosomal interaction brings the TAL1 promoter into close proximity with a T-cell-specific regulatory element located on chromosome 16, activating aberrant TAL1 oncogene expression. Thus, our study reveals a novel molecular mechanism involving changes in three-dimensional chromatin interactions that activate the TAL1 oncogene in human T-cell leukemia.
AB - Long-range chromatin interactions control metazoan gene transcription. However, the involvement of intra-and interchromosomal interactions in development and oncogenesis remains unclear. TAL1/SCL is a critical transcription factor required for the development of all hematopoietic lineages; yet, aberrant TAL1 transcription often occurs in T-cell acute lymphoblastic leukemia (T-ALL). Here, we report that oncogenic TAL1 expression is regulated by different intra-and interchromosomal loops in normal hematopoietic and leukemic cells, respectively. These intra-and interchromosomal loops alter the cell-type-specific enhancers that interact with the TAL1 promoter. We show that human SET1 (hSET1)-mediated H3K4 methylations promote a long-range chromatin loop, which brings the +51 enhancer in close proximity to TAL1 promoter 1 in erythroid cells. The CCCTC-binding factor (CTCF) facilitates this long-range enhancer/promoter interaction of the TAL1 locus in erythroid cells while blocking the same enhancer/promoter interaction of the TAL1 locus in human T-cell leukemia. In human T-ALL, a T-cell-specific transcription factor c-Maf-mediated interchromosomal interaction brings the TAL1 promoter into close proximity with a T-cell-specific regulatory element located on chromosome 16, activating aberrant TAL1 oncogene expression. Thus, our study reveals a novel molecular mechanism involving changes in three-dimensional chromatin interactions that activate the TAL1 oncogene in human T-cell leukemia.
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U2 - 10.1038/leu.2013.158
DO - 10.1038/leu.2013.158
M3 - Article
C2 - 23698277
AN - SCOPUS:84893788391
SN - 0887-6924
VL - 28
SP - 349
EP - 361
JO - Leukemia
JF - Leukemia
IS - 2
ER -