重叠的中央时钟网络回路调控果蝇的昼夜进食和活动节律

IF 2.9 3区 生物学 Q2 BIOLOGY
Journal of Biological Rhythms Pub Date : 2024-10-01 Epub Date: 2024-07-26 DOI:10.1177/07487304241263734
Sumit Saurabh, Ruth J Meier, Liliya M Pireva, Rabab A Mirza, Daniel J Cavanaugh
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引用次数: 0

摘要

昼夜节律系统协调多种行为输出,以确保适当的时间组织。昼夜节律调节行为的时间信息依赖于在大脑时钟神经元内运行的分子昼夜节律钟。在果蝇和其他生物体内,时钟神经元可分为几个在分子和功能上离散的亚群,这些亚群形成了一个相互连接的中央时钟网络。昼夜节律信号如何由时钟网络连贯地产生,并通过连接时钟细胞和下游神经元的输出回路传输,从而调节行为,目前尚不清楚。在这里,我们详尽地研究了时钟神经元亚群对果蝇两种主要行为输出控制的贡献:运动活动和摄食。我们利用细胞特异性操作来消除分子时钟功能或诱导整个时钟网络或特定亚群的电沉默。我们发现,操纵时钟细胞会产生类似的运动活动和摄食变化,这表明重叠的中央时钟电路调控着这些不同的行为输出。有趣的是,影响的程度和性质取决于所针对的时钟亚群。操纵侧时钟神经元会严重降低摄食和活动的节律性。与此相反,对背侧时钟神经元的操作只会对节律性产生微妙的影响,但会对全天的活动和摄食分布产生明显的变化。这些实验拓展了我们对时钟调节活动节律的认识,并首次广泛描述了中枢时钟对摄食节律的控制。尽管破坏中枢时钟细胞对活动和摄食的影响相似,但我们发现,阻止已识别输出回路中功能信号的操作会优先降低运动活动节律,而摄食节律则相对完好。这表明活动和摄食确实是可分离的行为,并进一步表明这些行为的不同昼夜节律控制在时钟网络下游的输出回路中发生了分化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Overlapping Central Clock Network Circuitry Regulates Circadian Feeding and Activity Rhythms in Drosophila.

The circadian system coordinates multiple behavioral outputs to ensure proper temporal organization. Timing information underlying circadian regulation of behavior depends on a molecular circadian clock that operates within clock neurons in the brain. In Drosophila and other organisms, clock neurons can be divided into several molecularly and functionally discrete subpopulations that form an interconnected central clock network. It is unknown how circadian signals are coherently generated by the clock network and transmitted across output circuits that connect clock cells to downstream neurons that regulate behavior. Here, we have exhaustively investigated the contribution of clock neuron subsets to the control of two prominent behavioral outputs in Drosophila: locomotor activity and feeding. We have used cell-specific manipulations to eliminate molecular clock function or induce electrical silencing either broadly throughout the clock network or in specific subpopulations. We find that clock cell manipulations produce similar changes in locomotor activity and feeding, suggesting that overlapping central clock circuitry regulates these distinct behavioral outputs. Interestingly, the magnitude and nature of the effects depend on the clock subset targeted. Lateral clock neuron manipulations profoundly degrade the rhythmicity of feeding and activity. In contrast, dorsal clock neuron manipulations only subtly affect rhythmicity but produce pronounced changes in the distribution of activity and feeding across the day. These experiments expand our knowledge of clock regulation of activity rhythms and offer the first extensive characterization of central clock control of feeding rhythms. Despite similar effects of central clock cell disruptions on activity and feeding, we find that manipulations that prevent functional signaling in an identified output circuit preferentially degrade locomotor activity rhythms, leaving feeding rhythms relatively intact. This demonstrates that activity and feeding are indeed dissociable behaviors, and furthermore suggests that differential circadian control of these behaviors diverges in output circuits downstream of the clock network.

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来源期刊
CiteScore
6.10
自引率
8.60%
发文量
48
审稿时长
>12 weeks
期刊介绍: Journal of Biological Rhythms is the official journal of the Society for Research on Biological Rhythms and offers peer-reviewed original research in all aspects of biological rhythms, using genetic, biochemical, physiological, behavioral, epidemiological & modeling approaches, as well as clinical trials. Emphasis is on circadian and seasonal rhythms, but timely reviews and research on other periodicities are also considered. The journal is a member of the Committee on Publication Ethics (COPE).
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