一个没有功能性的Hypocretin/Orexin激发系统的脊椎动物家族
Vassilis Bitsikas1, Fabien Cubizolles2, Alexander F Schier1
1Department of Molecular and Cellular Biology, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA; Biozentrum, University of Basel, Spitalstrasse 41, 4056 Basel, Switzerland.
Current biology : CB
|March 15, 2024
概括
在大多数动物中,对清醒至关重要的Hypocretin/Orexin系统在Botiidae鱼类家族中是非功能性的. 这些鱼表现出类似于睡眠的状态,没有麻醉症或触觉障碍,挑战了睡眠调节的既定模型.
科学领域:
- 神经科学是一个神经科学.
- 比较生物学的比较生物学
- 进化生物学 进化生物学
背景情况:
- 海波克里/奥雷辛系统对于保持清醒和抑制睡眠至关重要.
- 失去了海波克莱/奥雷克辛的功能导致了哺乳动物的麻醉症和触角症.
- 这种系统在非哺乳动物脊椎动物中的作用不太清楚.
研究的目的:
- 为了研究南亚鱼类Chromobotia macracanthus中的Hypocretin/Orexin系统.
- 为了确定这个系统的缺失是否会影响睡眠和唤醒行为.
- 为了探索Hypocretin/Orexin信号传递的进化保护.
主要方法:
- 在睡眠状态期间观察Chromobotia macracanthus的行为.
- 基因分析,以评估C. macracanthus.中的Hypocretin/Orexin系统的完整性.
- 在其他科动物物种和斑马鱼中对Hypocretin/Orexin系统进行比较分析.
主要成果:
- 克罗莫博提亚麦克拉坎图斯 (Chromobotia macracanthus) 呈现出一种明显的睡眠状态,其特点是侧卧.
- 在C. macracanthus.中,海波克莱/奥雷辛系统是伪造的 (非功能性的).
- 与哺乳动物不同的是,C. macracanthus不会表现出触发症或突然的行为停止.
- 其他四种科动物也缺乏功能性的烯/素系统.
- 斑马鱼具有克列/素突变,没有出现类似触感的发作.
结论:
- 博提科家族是第一个不需要功能性克莱/素系统来调节睡眠和清醒的已知脊椎动物群.
- 这挑战了Hypocretin/Orexin在预防麻醉症和触发症方面的普遍必要性.
- 建议在脊椎动物中控制睡眠和兴奋的其他进化途径.
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