Department of Genetics, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78712, USA.
Cell Rep. 2023 Jun 27;42(6):112544. doi: 10.1016/j.celrep.2023.112544. Epub 2023 May 24.
Maternal RNAs are stored from minutes to decades in oocytes throughout meiosis I arrest in a transcriptionally quiescent state. Recent reports, however, propose a role for nascent transcription in arrested oocytes. Whether arrested oocytes launch nascent transcription in response to environmental or hormonal signals while maintaining the meiosis I arrest remains undetermined. We test this by integrating single-cell RNA sequencing, RNA velocity, and RNA fluorescence in situ hybridization on C. elegans meiosis I arrested oocytes. We identify transcripts that increase as the arrested meiosis I oocyte ages, but rule out extracellular signaling through ERK MAPK and nascent transcription as a mechanism for this increase. We report transcript acquisition from neighboring somatic cells as a mechanism of transcript increase during meiosis I arrest. These analyses provide a deeper view at single-cell resolution of the RNA landscape of a meiosis I arrested oocyte and as it prepares for oocyte maturation and fertilization.
母体 RNA 在减数分裂 I 阻滞的卵母细胞中被储存数分钟至数十年,处于转录静止状态。然而,最近的报告提出了新生转录在阻滞卵母细胞中的作用。阻滞卵母细胞是否在维持减数分裂 I 阻滞的同时,对环境或激素信号作出反应,启动新生转录,仍未确定。我们通过整合线虫减数分裂 I 阻滞卵母细胞的单细胞 RNA 测序、RNA 速度和 RNA 荧光原位杂交来测试这一点。我们鉴定出随着阻滞的减数分裂 I 卵母细胞衰老而增加的转录本,但排除了 ERK MAPK 通过细胞外信号和新生转录作为这种增加的机制。我们报告了从邻近的体细胞中获取转录本作为减数分裂 I 阻滞期间转录本增加的一种机制。这些分析为减数分裂 I 阻滞卵母细胞的 RNA 景观及其为卵母细胞成熟和受精做准备提供了单细胞分辨率的更深入视图。