The histone demethylase PHF8 is essential for cytoskeleton dynamics.

The histone demethylase PHF8 is essential for cytoskeleton dynamics.
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DOI:
10.1093/nar/gks716
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发表时间:
2012-10
影响因子:
14.9
通讯作者:
Martínez-Balbás MA
Martínez-Balbás MA
中科院分区:
生物学2区
文献类型:
--
作者:
Asensio-Juan E;Gallego C;Martínez-Balbás MA

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PHF 8是一种与X连锁精神发育迟滞相关的组蛋白去甲基化酶。它被描述为参与细胞周期进程的转录辅激活因子,但其生理作用仍然知之甚少。在这里,我们表明PHF 8控制参与细胞粘附和细胞骨架组织的基因的表达,如RhoA,Rac 1和GSK 3 β。PHF 8的缺乏不仅导致细胞周期延迟,而且导致肌动蛋白细胞骨架紊乱和细胞粘附受损。我们的数据表明,PHF 8直接调节这些基因的表达,通过去甲基化H4 K20 me 1在启动子。此外,c-Myc转录因子与PHF 8合作调节所分析的启动子。神经元中的进一步分析表明,PHF 8的耗尽导致细胞骨架基因的下调,并导致神经突生长不足。总体而言,我们的研究结果表明,与PHF 8功能丧失相关的精神发育迟滞表型可能是由于细胞骨架功能改变导致的异常神经元连接。
PHF8 is a histone demethylase associated with X-linked mental retardation. It has been described as a transcriptional co-activator involved in cell cycle progression, but its physiological role is still poorly understood. Here we show that PHF8 controls the expression of genes involved in cell adhesion and cytoskeleton organization such as RhoA, Rac1 and GSK3β. A lack of PHF8 not only results in a cell cycle delay but also in a disorganized actin cytoskeleton and impaired cell adhesion. Our data demonstrate that PHF8 directly regulates the expression of these genes by demethylating H4K20me1 at promoters. Moreover, c-Myc transcription factor cooperates with PHF8 to regulate the analysed promoters. Further analysis in neurons shows that depletion of PHF8 results in down-regulation of cytoskeleton genes and leads to a deficient neurite outgrowth. Overall, our results suggest that the mental retardation phenotype associated with loss of function of PHF8 could be due to abnormal neuronal connections as a result of alterations in cytoskeleton function.
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