Stage-specific control of early B cell development by the transcription factor Ikaros.

Stage-specific control of early B cell development by the transcription factor Ikaros.
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DOI:
10.1038/ni.2828
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发表时间:
2014-03
期刊:
影响因子:
30.5
通讯作者:
Busslinger M
Busslinger M
中科院分区:
医学1区
文献类型:
--
作者:
Schwickert TA;Tagoh H;Gültekin S;Dakic A;Axelsson E;Minnich M;Ebert A;Werner B;Roth M;Cimmino L;Dickins RA;Zuber J;Jaritz M;Busslinger M

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伊卡洛斯是淋巴生成的重要调节因子。在这里,我们通过在原B细胞中条件性灭活IKZF1来研究Ikaros的B细胞特异性功能。B细胞的发育受阻于异常的“前B”细胞阶段,其特征是细胞黏附增加和前B细胞受体信号的丢失。研究发现,Ikaros可以激活BCR前信号转导的编码基因,并抑制参与下调Pre-BCR信号和上调整合素信号通路的基因。出乎意料的是,Aiolos表达的去抑制并不能弥补Pro-B细胞中Ikaros的丢失。Ikaros在被激活或被抑制的靶基因的调控元件上诱导或抑制活性染色质。值得注意的是,Ikaros结合和靶基因表达在早期B淋巴细胞生成的不同阶段受到动态调节。
Ikaros is an essential regulator of lymphopoiesis. Here, we studied the B-cell-specific function of Ikaros by conditional Ikzf1 inactivation in pro-B cells. B-cell development was arrested at an aberrant ‘pro-B’ cell stage characterized by increased cell adhesion and loss of pre-B cell receptor signaling. Ikaros was found to activate genes coding for pre-BCR signal transducers and to repress genes involved in the downregulation of pre-BCR signaling and upregulation of the integrin signaling pathway. Unexpectedly, derepression of Aiolos expression could not compensate for the loss of Ikaros in pro-B cells. Ikaros induced or suppressed active chromatin at regulatory elements of activated or repressed target genes. Notably, Ikaros binding and target gene expression was dynamically regulated at distinct stages of early B-lymphopoiesis.
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