SPIDR is required for homologous recombination during mammalian meiosis

SPIDR 是哺乳动物减数分裂过程中同源重组所必需的

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作者:Tao Huang, Xinyue Wu, Shiyu Wang, Ziyou Bao, Yanling Wan, Ziqi Wang, Mengjing Li, Xiaochen Yu, Yue Lv, Zhaojian Liu, Xiangfeng Chen, Wai-Yee Chan, Fei Gao, Gang Lu, Zi-Jiang Chen, Hongbin Liu

Abstract

Meiotic recombinases RAD51 and DMC1 mediate strand exchange in the repair of DNA double-strand breaks (DSBs) by homologous recombination. This is a landmark event of meiosis that ensures genetic diversity in sexually reproducing organisms. However, the regulatory mechanism of DMC1/RAD51-ssDNA nucleoprotein filaments during homologous recombination in mammals has remained largely elusive. Here, we show that SPIDR (scaffold protein involved in DNA repair) regulates the assembly or stability of RAD51/DMC1 on ssDNA. Knockout of Spidr in male mice causes complete meiotic arrest, accompanied by defects in synapsis and crossover formation, which leads to male infertility. In females, loss of Spidr leads to subfertility; some Spidr-/- oocytes are able to complete meiosis. Notably, fertility is rescued partially by ablation of the DNA damage checkpoint kinase CHK2 in Spidr-/- females but not in males. Thus, our study identifies SPIDR as an essential meiotic recombination factor in homologous recombination in mammals.

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