Differential involvement of E2A-corepressor interactions in distinct leukemogenic pathways.
Differential involvement of E2A-corepressor interactions in distinct leukemogenic pathways.
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DOI:
10.1093/nar/gkt855
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发表时间:
2014-01
影响因子:
14.9
通讯作者:
Zhang J
中科院分区:
文献类型:
--
作者:
Gow CH;Guo C;Wang D;Hu Q;Zhang J
E2A is a member of the E-protein family of transcription factors. Previous studies have reported context-dependent regulation of E2A-dependent transcription. For example, whereas the E2A portion of the E2A-Pbx1 leukemia fusion protein mediates robust transcriptional activation in t(1;19) acute lymphoblastic leukemia, the transcriptional activity of wild-type E2A is silenced by high levels of corepressors, such as the AML1-ETO fusion protein in t(8;21) acute myeloid leukemia and ETO-2 in hematopoietic cells. Here, we show that, unlike the HEB E-protein, the activation domain 1 (AD1) of E2A has specifically reduced corepressor interaction due to E2A-specific amino acid changes in the p300/CBP and ETO target motif. Replacing E2A-AD1 with HEB-AD1 abolished the ability of E2A-Pbx1 to activate target genes and to induce cell transformation. On the other hand, the weak E2A-AD1-corepressor interaction imposes a critical importance on another ETO-interacting domain, downstream ETO-interacting sequence (DES), for corepressor-mediated repression. Deletion of DES abrogates silencing of E2A activity by AML1-ETO in t(8;21) leukemia cells or by ETO-2 in normal hematopoietic cells. Our results reveal an E2A-specific mechanism important for its context-dependent activation and repression function, and provide the first evidence for the differential involvement of E2A-corepressor interactions in distinct leukemogenic pathways.
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DOI:
10.1016/j.bbrc.2009.09.111
发表时间:
2009-12-11
影响因子:
3.1
作者:
Cai Y;Xu Z;Xie J;Ham AJ;Koury MJ;Hiebert SW;Brandt SJ
通讯作者:
Brandt SJ
影响因子:
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通讯作者:
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影响因子:
4.8
作者:
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通讯作者:
LeBrun, DP
影响因子:
20.3
作者:
Denis, Christopher M.;Chitayat, Seth;Smith, Steven P.
通讯作者:
Smith, Steven P.
影响因子:
16
作者:
Heinz S;Benner C;Spann N;Bertolino E;Lin YC;Laslo P;Cheng JX;Murre C;Singh H;Glass CK
通讯作者:
Glass CK