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Updated: May 1, 2026

Reverse Yeast Two-hybrid System to Identify Mammalian Nuclear Receptor Residues that Interact with Ligands and/or Antagonists
Published on: November 15, 2013
Nuclear receptors rock around the clock
Xuan Zhao1, Han Cho, Ruth T Yu
1Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA.
Abstract:
Circadian rhythms characterize almost every aspect of human physiology, endocrinology, xenobiotic detoxification, cell growth, and behavior. Modern lifestyles that disrupt our normal circadian rhythms are increasingly thought to contribute to various disease conditions ranging from depression and metabolic disorders to cancer. This self-sustained time-keeping system is generated and maintained by an endogenous molecular machine, the circadian clock, which is a transcriptional mechanism composed of the transcription factors CLOCK and BMAL and their co-repressors, PER and CRY. Nuclear receptors (NRs) represent a large family of hormone-sensitive transcriptional regulators involved in a myriad of biological processes such as development, energy metabolism, reproduction, inflammation, and tissue homeostasis. Recent studies point not only to NR regulation by the clock, but also to NR regulation of the clock itself. Here, we discuss recent studies that functionally and mechanistically implicate NRs as key components of both the universal and adaptive circadian clock mechanisms. As proven pharmacological targets, nuclear receptors are promising targets for therapeutic control of many pathological conditions associated with the disruption of circadian rhythm.
Insights
Circadian rhythms are vital for human health. Nuclear receptors interact with the body's internal clock, offering potential therapeutic targets for diseases linked to disrupted circadian rhythms.
Area of Science:
- Chronobiology
- Molecular Endocrinology
- Genetics
Background:
- Circadian rhythms govern numerous physiological processes, including metabolism and behavior.
- Disruptions to circadian rhythms are linked to diseases like cancer and metabolic disorders.
- The molecular circadian clock involves transcription factors CLOCK, BMAL, PER, and CRY.
Purpose of the Study:
- To review recent findings on the role of nuclear receptors (NRs) in circadian clock mechanisms.
- To explore the bidirectional regulation between NRs and the circadian clock.
- To highlight NRs as potential therapeutic targets for circadian rhythm disruption-related pathologies.
Main Methods:
- Literature review of recent functional and mechanistic studies.
- Analysis of the interplay between nuclear receptors and core clock components.
- Synthesis of evidence implicating NRs in universal and adaptive circadian functions.
Main Results:
- Nuclear receptors are implicated as key components in circadian clock mechanisms.
- Evidence shows reciprocal regulation between the circadian clock and nuclear receptors.
- NRs are involved in both fundamental and adaptable aspects of circadian timing.
Conclusions:
- Nuclear receptors play a crucial role in the mammalian circadian clock.
- The interaction between NRs and the circadian clock offers novel therapeutic strategies.
- Targeting nuclear receptors may provide treatments for diseases associated with circadian disruption.
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