Pumilio 1 suppresses multiple activators of p53 to safeguard spermatogenesis.

Pumilio 1 suppresses multiple activators of p53 to safeguard spermatogenesis.
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DOI:
10.1016/j.cub.2012.01.039
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发表时间:
2012-03-06
期刊:
影响因子:
9.2
通讯作者:
Lin, Haifan
Lin, Haifan
中科院分区:
生物学1区
文献类型:
--
作者:
Chen, Dong;Zheng, Wei;Lin, Aiping;Uyhazi, Katherine;Zhao, Hongyu;Lin, Haifan

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在精子发生过程中,生殖细胞最初通过有丝分裂呈指数增长。这些细胞中的大多数通过p53介导的凋亡被清除,以维持种系的稳态。然而,p53的活性必须被精确调节,特别是在有丝分裂后的生精细胞中被抑制,以保证精子发生的稳健性。目前,这种抑制是如何实现的还不清楚。在这里,我们发现Pumilio 1,一种转录后调节剂,与代表1527个基因的mrna结合,与p53、细胞周期和MAPK信号通路相关的mrna显著富集。特别是,8个编码p53激活因子的mrna被Pumilio 1抑制。删除Pumilio 1会导致p53的强烈激活和凋亡,主要发生在精细胞中,从而破坏精子的产生和生育能力。在Pumilio 1缺失小鼠中,去除p53可减少细胞凋亡并挽救睾丸萎缩。这些结果表明p53通路的关键组分在转录后水平上由Pumilio 1协调调节,这可能是RNA操纵子的一个例子。
During spermatogenesis, germ cells initially expand exponentially through mitoses. A majority of these cells are then eliminated through p53-mediated apoptosis to maintain germline homeostasis. However, the activity of p53 must be precisely modulated, especially suppressed in postmitotic spermatogenic cells, to guarantee robustness of spermatogenesis. Currently, how the suppression is achieved is not understood. Here, we show that Pumilio 1, a posttranscriptional regulator, binds to mRNAs representing 1527 genes, with significant enrichment for mRNAs involved in pathways regulating p53, cell cycle, and MAPK signaling. Particularly, eight mRNAs encoding activators of p53 are repressed by Pumilio 1. Deleting Pumilio 1 results in strong activation of p53 and apoptosis mostly in spermatocytes, which disrupts sperm production and fertility. Removing p53 reduces apoptosis and rescues testicular hypotrophy in Pumilio 1-null mice. These results indicate that key components of the p53 pathway are coordinately regulated by Pumilio 1 at the posttranscriptional level, which may exemplify an RNA operon.
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