RUNX transcription factor-mediated association of Cd4 and Cd8 enables coordinate gene regulation.

RUNX transcription factor-mediated association of Cd4 and Cd8 enables coordinate gene regulation.
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DOI:
10.1016/j.immuni.2011.03.004
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发表时间:
2011-03-25
期刊:
影响因子:
32.4
通讯作者:
Skok JA
Skok JA
中科院分区:
医学1区
文献类型:
--
作者:
Collins A;Hewitt SL;Chaumeil J;Sellars M;Micsinai M;Allinne J;Parisi F;Nora EP;Bolland DJ;Corcoran AE;Kluger Y;Bosselut R;Ellmeier W;Chong MM;Littman DR;Skok JA

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T细胞命运分别与辅助T细胞和细胞毒性T细胞中的CD4或CD8的互斥表达相关。一个基因座的表达如何与另一个基因座的抑制在时间上协调一直是一个长期存在的谜,尽管我们知道RUNX转录因子激活Cd8基因座,沉默Cd4基因座,并抑制Zbtb7b基因座(编码转录因子ThPOK),这是CD4表达所必需的。在这里,我们发现,核组织被改变的成员之间的相互作用,这种转录因子电路:RUNX结合介导的协会的镉4和镉8,而ThPOK结合保持的位点分开。此外,Cd4内的靶向缺失调节了CD8的表达和Cd8的着丝粒周围重新定位。因此,Cd4和Cd8之间的通信似乎能够实现远程表观遗传调节,以确保在成熟的CD4或CD8单阳性(SP)细胞中一个的表达排除另一个。Cd4和Cd8基因的关联使得能够协调基因调控Cd4和Cd8在表达CD8的细胞中彼此关联RUNX转录因子介导Cd4和Cd8基因的关联Cd4内的靶向缺失调节Cd8的表达和核定位
T cell fate is associated with mutually exclusive expression of CD4 or CD8 in helper and cytotoxic T cells, respectively. How expression of one locus is temporally coordinated with repression of the other has been a long-standing enigma, though we know RUNX transcription factors activate the Cd8 locus, silence the Cd4 locus, and repress the Zbtb7b locus (encoding the transcription factor ThPOK), which is required for CD4 expression. Here we found that nuclear organization was altered by interplay among members of this transcription factor circuitry: RUNX binding mediated association of Cd4 and Cd8 whereas ThPOK binding kept the loci apart. Moreover, targeted deletions within Cd4 modulated CD8 expression and pericentromeric repositioning of Cd8. Communication between Cd4 and Cd8 thus appears to enable long-range epigenetic regulation to ensure that expression of one excludes the other in mature CD4 or CD8 single-positive (SP) cells. ► Association of Cd4 and Cd8 genes enables coordinate gene regulation ► Cd4 and Cd8 associate with one another in CD8-expressing cells ► RUNX transcription factor mediates association of Cd4 and Cd8 genes ► Targeted deletions within Cd4 modulate expression and nuclear location of Cd8
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