The ATM kinase induces microRNA biogenesis in the DNA damage response.

The ATM kinase induces microRNA biogenesis in the DNA damage response.
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DOI:
10.1016/j.molcel.2011.01.020
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发表时间:
2011-02-18
期刊:
影响因子:
16
通讯作者:
Lu X
Lu X
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang X;Wan G;Berger FG;He X;Lu X

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DNA损伤反应涉及检测和修复DNA损伤的复杂过程网络。在这里,我们表明,miRNA的生物合成是全球诱导后,DNA损伤在ATM依赖性的方式。大约四分之一的miRNAs在DNA损伤后显著上调,而ATM的缺失则取消了它们的诱导。KSRP(KH型剪接调节蛋白)是将DNA损伤信号转化为miRNA生物合成的关键参与者。ATM激酶直接结合并磷酸化KSRP,导致KSRP和pri-miRNA之间的相互作用增强,并增加KSRP在miRNA加工中的活性。KSRP的ATM磷酸化位点的突变损害了其调节miRNA的活性。这些发现揭示了DNA损伤信号与miRNA生物合成相关的机制。
The DNA damage response involves a complex network of processes that detect and repair DNA damage. Here we show that miRNA biogenesis is globally induced upon DNA damage in an ATM-dependent manner. About one fourth of miRNAs are significantly up-regulated after DNA damage, while loss of ATM abolishes their induction. KSRP (KH-type splicing regulatory protein) is a key player that translates DNA damage signaling to miRNA biogenesis. The ATM kinase directly binds to and phosphorylates KSRP, leading to enhanced interaction between KSRP and pri-miRNAs and increased KSRP activity in miRNA processing. Mutations of the ATM phosphorylation sites of KSRP impaired its activity in regulating miRNAs. These findings reveal a mechanism by which DNA damage signaling is linked to miRNA biogenesis.
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