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Related Concept Videos

Transducer Mechanism: Nuclear Receptors01:31

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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PPARγ phase separates with RXRα at PPREs to regulate target gene expression.

Zhean Li1,2, Lingling Luo3, Wenxia Yu1

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|April 27, 2022
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Peroxisome proliferator-activated receptor gamma (PPARγ) forms nuclear condensates to activate gene expression. This phase separation mechanism enhances the specific targeting of PPARγ and its partner RXRα to DNA, boosting target gene activity.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Peroxisome proliferator-activated receptor gamma (PPARγ) is crucial for adipogenesis and lipid metabolism.
  • PPARγ functions as a heterodimer with retinoid X receptor (RXR) α, binding to PPAR response elements (PPREs).
  • The precise mechanism by which PPARγ regulates transcriptional responses remains unclear.

Purpose of the Study:

  • To investigate the role of phase separation in PPARγ-mediated transcriptional activation.
  • To elucidate how PPARγ forms nuclear structures and interacts with RXRα at target gene loci.
  • To determine if enforced condensate formation enhances PPARγ target gene expression.

Main Methods:

  • In vitro phase separation assays.
  • Cellular imaging to observe nuclear condensate formation.
  • Optogenetic approaches to control condensate formation.
  • Gene expression analysis of PPARγ target genes.

Main Results:

  • PPARγ forms phase-separated droplets in vitro and solid-like nuclear condensates in cells.
  • Condensate formation is mediated by the DNA-binding domain of PPARγ, specifically its zinc finger motif.
  • PPARγ forms nuclear condensates at PPREs, recruiting and compartmentalizing RXRα.
  • Enforced PPARγ/RXRα condensate formation at PPREs significantly enhances target gene expression.

Conclusions:

  • PPARγ utilizes phase separation to form nuclear condensates at target gene sites.
  • This mechanism facilitates the specific recruitment of RXRα and enhances transcriptional activation.
  • Phase separation represents a novel regulatory mechanism for PPARγ-driven gene expression.