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Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
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Molecular components of the circadian clock regulate HIV-1 replication.

Helene Borrmann1, Görkem Ulkar1, Anna E Kliszczak1

  • 1Nuffield Department of Clinical Medicine, University of Oxford, Oxford, UK.

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The study reveals that the body's internal clock, or circadian rhythm, influences human immunodeficiency virus 1 (HIV-1) replication. This discovery may lead to new time-based therapies for HIV-1 infection.

Keywords:
BioinformaticsBiological sciencesMolecular biologyVirology

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Area of Science:

  • Virology
  • Chronobiology
  • Molecular Biology

Background:

  • Human immunodeficiency virus 1 (HIV-1) presents a significant global health challenge with no current cure or vaccine.
  • Circadian rhythms, the body's internal daily cycles, are crucial for coordinating responses to environmental changes and pathogens.
  • Diurnal variations in peripheral HIV-1 viral loads are observed, but the mechanisms driving this rhythmicity are not understood.

Purpose of the Study:

  • To investigate the role of the cell-intrinsic circadian clock in regulating HIV-1 replication.
  • To elucidate the molecular mechanisms underlying the time-of-day variations in HIV-1 viral loads.

Main Methods:

  • Utilized circadian-synchronized systems to study HIV-1 replication.
  • Employed gene silencing techniques to investigate the role of the circadian activator Bmal1.
  • Performed chromatin immunoprecipitation assays to detect BMAL1 binding to the HIV-1 promoter.
  • Analyzed the binding of nuclear receptors REV-ERB and ROR to the HIV-long terminal repeat.
  • Conducted bioinformatic analyses to identify circadian-regulated host factors.

Main Results:

  • Demonstrated that the cell-intrinsic clock regulates rhythmic HIV-1 replication.
  • Showed that silencing Bmal1 abolished the rhythmic replication of HIV-1.
  • Confirmed BMAL1 binding to the HIV-1 promoter.
  • Revealed differential binding of REV-ERB and ROR to the HIV-long terminal repeat at various circadian times.
  • Identified circadian regulation of host factors involved in HIV-1 replication.

Conclusions:

  • The circadian clock plays a significant role in regulating HIV-1 replication.
  • BMAL1 and its associated nuclear receptors (REV-ERB, ROR) are key components in the time-of-day regulation of HIV-1 transcription.
  • Circadian regulation of host factors provides an additional layer of control over rhythmic viral replication.
  • Understanding these circadian mechanisms can pave the way for novel, time-based therapeutic strategies against HIV-1.