Aberrant activation of the GIMAP enhancer by oncogenic transcription factors in T-cell acute lymphoblastic leukemia.

Aberrant activation of the GIMAP enhancer by oncogenic transcription factors in T-cell acute lymphoblastic leukemia.
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DOI:
10.1038/leu.2016.392
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发表时间:
2017-08
期刊:
影响因子:
11.4
通讯作者:
Sanda T
Sanda T
中科院分区:
医学1区
文献类型:
--
作者:
Liau WS;Tan SH;Ngoc PCT;Wang CQ;Tergaonkar V;Feng H;Gong Z;Osato M;Look AT;Sanda T

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转录因子TAL 1/SCL是T细胞急性淋巴细胞白血病(T-ALL)中最常见的癌基因之一,T-ALL是由胸腺T细胞前体的白血病转化引起的恶性疾病。TAL 1通常在造血干细胞(HSC)中表达,但在未成熟的胸腺细胞中沉默。我们假设TAL 1通过激活在未成熟胸腺细胞中通常被抑制的基因而促进白血病发生。在此,我们鉴定了一种新的TAL 1调节的超级增强子,其控制GIMAP基因座,该基因座位于T-ALL细胞中的绝缘染色体基因座内。GIMAP基因在HSC和成熟T细胞中表达,但在胸腺细胞分化的未成熟阶段下调。在人T-ALL细胞中,GIMAP增强子被TAL 1、RUNX 1和GATA 3激活,但被E蛋白抑制。人GIMAP基因单独在未成熟胸腺细胞中过表达不会诱导肿瘤发生,但会加速斑马鱼白血病的发展。我们的研究结果表明,异常激活的GIMAP增强子有助于T细胞白血病。
The transcription factor TAL1/SCL is one of the most prevalent oncogenes in T-cell acute lymphoblastic leukemia (T-ALL), a malignant disorder resulting from leukemic transformation of thymus T-cell precursors. TAL1 is normally expressed in hematopoietic stem cells (HSCs) but is silenced in immature thymocytes. We hypothesize that TAL1 contributes to leukemogenesis by activating genes that are normally repressed in immature thymocytes. Herein, we identified a novel TAL1-regulated super-enhancer controlling the GIMAP locus, which resides within an insulated chromosomal locus in T-ALL cells. The GIMAP genes are expressed in HSCs and mature T-cells but are downregulated during the immature stage of thymocyte differentiation. The GIMAP enhancer is activated by TAL1, RUNX1 and GATA3 in human T-ALL cells but is repressed by E-proteins. Overexpression of human GIMAP genes in immature thymocytes alone does not induce tumorigenesis but accelerates leukemia development in zebrafish. Our results demonstrate that aberrant activation of the GIMAP enhancer contributes to T-cell leukemogenesis.
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