时钟在鸟类中进化为同步内部节奏与日常环境线索
Raphael Aguillon1,2, Mieka Rinsky1, Noa Simon-Blecher1
1Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat Gan, Israel.
eLife
|May 14, 2024
概括
这项研究揭示了时钟基因对于鱼Nematostella vectensis的昼夜行为至关重要. 当时钟基因发生突变时,依赖光线的通路可以部分恢复节奏,突出显示了其进化作用.
科学领域:
- * 进化生物学 进化生物学
- * * 时间生物学
- * 分子遗传学 分子遗传学
背景情况:
- *对于预测每日周期至关重要的循环节律在动物中保持不变.
- *涉及CLOCK的转录-翻译反循环 (TTFL) 是一个关键的起器机制.
- * 基底动物中的时钟的进化起源和功能仍然不清楚.
研究的目的:
- * 为了研究Cnidarian中的CLOCK基因的进化起源和功能,Nematostella vectensis*.
- * 了解NvClk在产生昼夜节律中的作用及其与光线线索的相互作用.
主要方法:
- *使用CRISPR/Cas9基因编辑生成NvClk*突变体.
- *在恒定的黑暗 (DD),恒定的光 (LL) 和明暗 (LD) 条件下进行行为分析.
- *转录组分析以评估节奏性基因表达模式.
主要成果:
- * *NvClk* 突变的息肉在DD和LL中失去了昼夜行为,但在LD中保持了24小时的节律.
- * 转录组分析显示突变物体的节律基因表达发生改变,特别是在DD下.
- * 一个对光敏感的途径部分补偿了突变者对昼夜节律的损失.
结论:
- * * 钟*基因在类动物中进化,使生理和行为节奏与迪尔周期同步.
- *依赖光线的路径可以部分挽救昼夜时钟的干扰,表明功能冗余.
- 尼马托斯泰拉 (Nematostella vectensis) 为研究早期动物血统中昼夜钟的演化提供了一个模型.
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