A novel regulatory circuit in base excision repair involving AP endonuclease 1, Creb1 and DNA polymerase beta.

A novel regulatory circuit in base excision repair involving AP endonuclease 1, Creb1 and DNA polymerase beta.
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DOI:
10.1093/nar/gkq1142
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发表时间:
2011-04
影响因子:
14.9
通讯作者:
Strauss PR
Strauss PR
中科院分区:
生物学2区
文献类型:
--
作者:
Pei DS;Yang XJ;Liu W;Guikema JE;Schrader CE;Strauss PR

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DNA修复是维持干细胞和早期胚胎基因组稳定性所必需的。在关键时刻,DNA的氧化损伤需要碱基切除修复(BER)途径。由于早期的斑马鱼胚胎缺乏BER中的主要聚合酶,DNA聚合酶β,修复通过复制聚合酶进行,即使有足够的polb mRNA。在这里,我们报告说,Polb蛋白未能出现在适当的时间在发展时,AP核酸内切酶1(Apex),在BER的上游蛋白质,被击倒。由于polb含有Creb 1结合位点,我们研究了敲低Apex是否会影响Creb 1。Apex敲低导致Creb 1和Creb复合体成员的丢失,但不导致Creb 1磷酸化。这种作用与p53无关。虽然apex和creb 1 mRNA在Apex敲低后拯救了Creb 1和Polb,但Apex不是creb 1转录的共激活因子。这一观察结果具有广泛的意义,因为当在apex+/-小鼠的B细胞中抑制Apex时,也会出现类似的结果。这些结果描述了一种新的调节电路,涉及Apex,Creb 1和Polb,并提供了一种机制,在高等真核生物中的Apex损失的致命性。
DNA repair is required to maintain genome stability in stem cells and early embryos. At critical junctures, oxidative damage to DNA requires the base excision repair (BER) pathway. Since early zebrafish embryos lack the major polymerase in BER, DNA polymerase ß, repair proceeds via replicative polymerases, even though there is ample polb mRNA. Here, we report that Polb protein fails to appear at the appropriate time in development when AP endonuclease 1 (Apex), the upstream protein in BER, is knocked down. Because polb contains a Creb1 binding site, we examined whether knockdown of Apex affects creb1. Apex knockdown results in loss of Creb1 and Creb complex members but not Creb1 phosphorylation. This effect is independent of p53. Although both apex and creb1 mRNA rescue Creb1 and Polb after Apex knockdown, Apex is not a co-activator of creb1 transcription. This observation has broad significance, as similar results occur when Apex is inhibited in B cells from apex+/− mice. These results describe a novel regulatory circuit involving Apex, Creb1 and Polb and provide a mechanism for lethality of Apex loss in higher eukaryotes.
使用Halochip-Chip和高吞吐量报告基因测定法对CREB信号通路进行功能分析。
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