生物
护士室
卵母细胞
细胞生物学
中心体
细胞质
微管
生殖系
基因
遗传学
卵子发生
细胞周期
胚胎
作者
Wanbao Niu,Allan C. Spradling
出处
期刊:Cell
[Elsevier]
日期:2022-05-26
卷期号:185 (14): 2576-2590.e12
被引量:56
标识
DOI:10.1016/j.cell.2022.05.001
摘要
Mouse germline cysts, on average, develop into six oocytes supported by 24 nurse cells that transfer cytoplasm and organelles to generate a Balbiani body. We showed that between E14.5 and P5, cysts periodically activate some nurse cells to begin cytoplasmic transfer, which causes them to shrink and turnover within 2 days. Nurse cells die by a programmed cell death (PCD) pathway involving acidification, similar to Drosophila nurse cells, and only infrequently by apoptosis. Prior to initiating transfer, nurse cells co-cluster by scRNA-seq with their pro-oocyte sisters, but during their final 2 days, they cluster separately. The genes promoting oocyte development and nurse cell PCD are upregulated, whereas the genes that repress transfer, such as Tex14, and oocyte factors, such as Nobox and Lhx8, are under-expressed. The transferred nurse cell centrosomes build a cytocentrum that establishes a large microtubule aster in the primordial oocyte that organizes the Balbiani body, defining the earliest oocyte polarity.
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