时钟基因Per1可能会对海马内存巩固进行白天控制
Lauren Bellfy1,2, Chad W Smies1, Alicia R Bernhardt1
1Department of Biology, Pennsylvania State University, University Park, PA, 16802, USA.
概括
小鼠在白天表现出更好的长期记忆,这与海马中的昼夜钟基因Period1 (Per1) 有关. 背部海马中的局部Per1调节了独立于中央昼夜系统的记忆巩固.
科学领域:
- 时间生物学 时间生物学
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- 昼夜系统由上神核 (SCN) 调节,影响包括记忆在内的各种生物功能.
- 像背部海马体 (DH) 这样的大脑区域的局部"卫星钟"也可能影响日间时间依赖的功能.
- 了解日间记忆变化的分子机制对于认知健康至关重要.
研究的目的:
- 为了研究小鼠在白天/夜间周期中如何调节记忆性能.
- 为了识别由昼夜节律调节的特定记忆阶段.
- 阐明昼夜钟基因Period1 (Per1) 在记忆巩固的DH中的作用.
主要方法:
- 依赖海马的物体位置记忆任务在小鼠24小时周期.
- 用RNA测序来识别海马体中昼夜钟基因表达.
- 在背部海马体 (DH) 中对Per1进行局部淘汰,以评估其功能作用.
主要成果:
- 与夜晚相比,小鼠在白天表现出优越的长期记忆性能.
- 这种日间记忆效应与记忆巩固有关,而不是获取或检索.
- 在海马体中学习诱导的Per1表达与记忆表现发生振荡,确定Per1是关键因素.
- 在DH中,Per1的局部淘汰会影响空间记忆,但不会影响整体的昼夜节律或睡眠.
结论:
- 记忆巩固表现出白天的变化,在白天提高了表现.
- 昼夜钟基因Period1 (Per1) 在背部海马体内调解白天记忆巩固方面发挥着关键作用.
- 佩尔1在DH内部局部运作,调节记忆,独立于其在中央SCN心脏起器中的作用,并且不影响睡眠或一般的昼夜行为.
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