DPL-1 (DP) acts in the germ line to coordinate ovulation and fertilization in C. elegans.

DPL-1 (DP) acts in the germ line to coordinate ovulation and fertilization in C. elegans.
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DPL-1(DP)在种植线上起作用,以协调秀丽隐杆线虫的排卵和施肥。

DOI:
10.1016/j.mod.2009.01.008
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发表时间:
2009-05
影响因子:
2.6
通讯作者:
Reinke, Valerie
Reinke, Valerie
中科院分区:
生物学4区
文献类型:
--
作者:
Chi, Woo;Reinke, Valerie

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卵子发生、排卵和受精的适当协调对于成功繁殖至关重要。在秀丽隐杆线虫中,编码 E2F 异二聚体转录因子 EFL-1/DPL-1 亚基的 dpl-1 中的强烈功能丧失突变会导致排卵和受精过程中的严重缺陷。在这里,我们证明,在 dpl-1 突变体中,体细胞性腺结构和鞘细胞收缩率显得正常,但受精囊瓣膜的扩张没有正常发生,导致卵母细胞被困在近端性腺臂中并进入有丝分裂。这种排卵缺陷可以通过增加 ITR-1 的活性来部分抑制,ITR-1 是受精囊中的一种肌醇三磷酸受体,可响应 IP3 信号而促进扩张。组织特异性拯救实验表明,DPL-1 在生殖细胞而非受精囊中的表达可以恢复 dpl-1 突变体的排卵和受精,这表明 DPL-1 的缺失可能会破坏源自卵母细胞的促排卵信号,从而刺激受精囊。此外,我们发现单个 EFL-1/DPL-1 响应基因 rme-2 在 dpl-1 突变体种系中的表达可显着挽救排卵,但不能挽救受精。相反,其他 EFL-1/DPL-1 反应基因的作用是促进成功受精。我们提出,DPL-1 与 EFL-1 在卵母细胞发育过程中共同作用,直接调节耦合排卵和受精关键事件的转录程序。
Proper coordination of oogenesis, ovulation, and fertilization is essential for successful reproduction. In C. elegans, a strong loss-of-function mutation in dpl-1, which encodes a subunit of the E2F heterodimeric transcription factor EFL-1/DPL-1, causes severe defects during ovulation and fertilization. Here we demonstrate that the somatic gonad structure and sheath cell contraction rate appear normal in dpl-1 mutants, but that dilation of the spermatheca valve does not occur properly, causing oocytes to become trapped in the proximal gonad arm and enter endomitosis. This ovulation defect can be partially suppressed by increasing the activity of ITR-1, an inositol triphosphate receptor in the spermatheca that promotes dilation in response to IP3 signaling. Tissue-specific rescue experiments demonstrate that expression of DPL-1 in germ cells but not the spermatheca can restore both ovulation and fertilization in dpl-1 mutants, indicating that the absence of DPL-1 likely disrupts a pro-ovulation signal originating in the oocyte that in turn stimulates the spermatheca. Moreover, we found that expression of a single EFL-1/DPL-1-responsive gene, rme-2, in the germ line of dpl-1 mutants significantly rescues ovulation, but not fertilization. Instead, other EFL-1/DPL-1-responsive genes function to promote successful fertilization. We propose that DPL-1 acts with EFL-1 in developing oocytes to directly regulate a transcriptional program that couples the critical events of ovulation and fertilization.
DOI: 10.1016/j.cub.2007.08.011
发表时间: 2007-09-18
期刊: CURRENT BIOLOGY
影响因子: 9.2
作者:
Maruyama, Rika;Velarde, Nathalie V.;Singson, Andrew
通讯作者: Singson, Andrew
DOI: 10.1242/dev.02490
发表时间: 2006-08-01
期刊: Development (Cambridge, England)
影响因子: --
作者:
Chi, Woo;Reinke, Valerie
通讯作者: Reinke, Valerie
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发表时间: 2006-10-01
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期刊: MOLECULAR CELL
影响因子: 16
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DOI: 10.1126/science.1057586
发表时间: 2001-03-16
期刊: SCIENCE
影响因子: 56.9
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