哺乳动物的卵细胞将mRNA储存在与线粒体相关的无膜区
Shiya Cheng1, Gerrit Altmeppen1, Chun So1
1Department of Meiosis, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
概括
哺乳动物卵细胞储存必要的母体信使RNA (mRNA) 在一个新的线粒体关联核蛋白域 (MARDO). 这种由ZAR1调节的结构确保了正确的翻译并保护了mRNA的早期发育.
科学领域:
- 细胞生物学
- 发育生物学
- 分子繁殖
背景情况:
- 成长的卵细胞在转录上是无声的,依赖于存储的母体信使RNAs (mRNAs) 来进行发育.
- 哺乳动物卵细胞中母体mRNA存储的确切位置和机制在很大程度上是未知的.
研究的目的:
- 在哺乳动物卵细胞中识别和描述母体mRNA的存储位置.
- 阐明调节母体mRNA局部化,翻译和稳定的分子机制.
主要方法:
- 免疫光显微镜可视化MARDO形成和ZAR1定位.
- 线粒体膜电位测量
- 随后进行RNA免疫沉测序 (RIP-Seq) 来识别与MARDO相关的mRNA.
- 评估MARDO功能的ZAR1淘汰小鼠模型.
主要成果:
- 哺乳动物卵细胞在线粒体相关的核糖蛋白域 (MARDO) 中积累母亲的mRNA.
- 通过RNA结合蛋白ZAR1促进MARDO的形成,并与线粒体膜潜能的增加有关.
- 作为一种类似水凝的基质,MARDO可以抑制mRNA的翻译和线粒体的聚合.
- 损失ZAR1会破坏MARDO,导致线粒体分散和早产的mRNA损失,影响生育能力.
结论:
- 一个新的线粒体相关的无膜区,MARDO,被确定为哺乳动物卵细胞中母体mRNA存储的主要位置.
- 在调节线粒体分布,母体mRNA储存,转化和衰变方面,MARDO起着至关重要的作用.
- 依赖ZAR1的MARDO对维持卵细胞中性成熟和确保成功的早期胚胎发育和生育至关重要.
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