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Circadian Rhythms and Gene Regulation02:19

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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
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A relaxation oscillator is one of the applications of RC circuits. A neon lamp relaxation oscillator comprises a capacitor, a resistor, a voltage source, and a lamp. The lamp acts like an open circuit, with infinite resistance until the potential difference across the lamp reaches a specific voltage. At that voltage, the lamp acts like a short circuit with zero resistance, and the capacitor discharges through the lamp, thus producing light. Once the capacitor is fully discharged through the...
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Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
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相关实验视频

Updated: Jan 10, 2026

In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells
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一个基于内部的定时器用于昼夜节律.

Ye Yuan1, Amanda Linskens1, Rafael De Gouvea2

  • 1Cellular and Molecular Biology Program, University of Michigan, Ann Arbor, MI, 48109, USA.

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概括
此摘要是机器生成的。

在Drosophila无时代 (tim) 基因中的一种新型RNA定时器,内P,通过调节mRNA核保留来控制昼夜节律. 这个内部子.

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Rapid Analysis of Circadian Phenotypes in Arabidopsis Protoplasts Transfected with a Luminescent Clock Reporter
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科学领域:

  • 时间生物学 时间生物学
  • 分子生物学分子生物学
  • 在RNA生物学,RNA生物学.

背景情况:

  • 循环时钟通过转录-翻译反循环控制了真核生物中的24小时节奏.
  • 确切的分子机制设置昼夜周期仍然不完全理解.

研究的目的:

  • 为了确定调节昼夜周期长度的新型分子计时器.
  • 研究RNA处理在昼夜基因表达中的作用.

主要方法:

  • 单个分子成像成像技术
  • 新生RNA测序新生RNA测序
  • 在CRISPR中介的基因编辑中.
  • 异质的记者测定在Drosophila和人类细胞中进行.

主要成果:

  • 在Drosophila无时代 (tim) 基因中的单个内子 (intron P) 作为基于RNA的分子定时器.
  • 由于效率低下的拼接,Intron P会导致tim mRNAs的50%的核保留,控制周期长度.
  • 移除P 内子将昼夜周期缩短至22小时;将其插入其他基因将核保留.
  • RNA结合蛋白 (Hrb27C,鱼,Qkr58E-2) 调节了内子P拼接动力学.

结论:

  • 时间内钟P是第一个在昼夜时钟中发现的基于内钟的分子计时器.
  • 剪接动力学代表了时间基因表达中的关键调节层.
  • 这种机制对发育和免疫有潜在的影响.