Cul4A is essential for spermatogenesis and male fertility.

Cul4A is essential for spermatogenesis and male fertility.
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DOI:
10.1016/j.ydbio.2011.01.028
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发表时间:
2011-04-15
影响因子:
2.7
通讯作者:
Raychaudhuri P
Raychaudhuri P
中科院分区:
生物学3区
文献类型:
--
作者:
Kopanja D;Roy N;Stoyanova T;Hess RA;Bagchi S;Raychaudhuri P

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哺乳动物Cul 4基因Cul 4A和Cul 4 B编码基于cullin的E3泛素连接酶的支架组分。两个Cul 4基因在功能上是冗余的。最近的研究表明,表达截短的CUL 4A的小鼠不能与其功能伴侣ROC 1相互作用,不表现出发育表型。我们产生了缺乏外显子4-8的Cul 4A-/-菌株,其不表达任何可检测的截短蛋白。在该品系中,雄性小鼠是不育的,并且表现出精子发生的严重缺陷。初级精母细胞缺乏通过后期前期I的进展,该时间点X连锁Cul 4 B基因的表达由于减数分裂性染色体失活而沉默。Cul 4A-/-小鼠的睾丸表现出广泛的细胞凋亡。有趣的是,粗线期精母细胞表现出持续的双链断裂,表明同源重组的缺陷。此外,我们发现CUL 4A定位于粗线期前精母细胞中产生的双链断裂。这些观察结果确定了CUL 4A在减数分裂重组中的新功能,并证明了CUL 4A在精子发生中的重要作用。
The mammalian Cul4 genes, Cul4A and Cul4B, encode the scaffold components of the cullin-based E3 ubiquitin ligases. The two Cul4 genes are functionally redundant. Recent study indicated that mice expressing a truncated CUL4A that fails to interact with its functional partner ROC1 exhibit no developmental phenotype. We generated a Cul4A-/- strain lacking exons 4-8 that does not express any detectable truncated protein. In this strain, the male mice are infertile and exhibit severe deficiencies in spermatogenesis. The primary spermatocytes are deficient in progression through late prophase I, a time point when expression of the X-linked Cul4B gene is silenced due to meiotic sex chromosome inactivation. Testes of the Cul4A-/- mice exhibit extensive apoptosis. Interestingly, the pachytene spermatocytes exhibit persistent double stranded breaks, suggesting a deficiency in homologous recombination. Also, we find that CUL4A localizes to the double stranded breaks generated in pre-pachytene spermatocytes. The observations identify a novel function of CUL4A in meiotic recombination and demonstrate an essential role of CUL4A in spermatogenesis.
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