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Transcriptional interference by antisense RNA is required for circadian clock function.

Zhihong Xue1, Qiaohong Ye1, Simon R Anson2

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Natural antisense RNAs, like qrf, are crucial for robust circadian rhythms in eukaryotes. This study reveals a double negative feedback loop involving frq and qrf, essential for sustained clock function and regulation.

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Area of Science:

  • Molecular Biology
  • Chronobiology
  • Genetics

Background:

  • Eukaryotic circadian clocks rely on negative feedback loops for rhythm generation.
  • Natural antisense RNAs are prevalent but their functions remain largely unclear.
  • The frequency (frq) gene is a core component of the Neurospora circadian clock.

Purpose of the Study:

  • To elucidate the role and mechanism of the long non-coding antisense RNA (qrf) in the Neurospora circadian clock.
  • To investigate the regulatory relationship between frq and qrf.
  • To understand how antisense transcription contributes to circadian rhythmicity.

Main Methods:

  • Genetic analysis in Neurospora crassa.
  • Mathematical modeling of gene regulatory networks.
  • Analysis of qrf and frq transcript levels under different light conditions.
  • Investigation of chromatin modifications and transcription termination.

Main Results:

  • qrf transcription is regulated by both light-dependent and light-independent pathways.
  • Light-dependent qrf represses frq expression and influences clock resetting.
  • Light-independent qrf is essential for sustained circadian rhythmicity.
  • A double negative feedback loop between frq and qrf ensures robust clock function.
  • Antisense transcription inhibits sense expression via chromatin modification and premature termination.

Conclusions:

  • Antisense transcription is an essential component of the eukaryotic circadian system.
  • The interplay between frq and qrf forms a critical regulatory mechanism for circadian robustness.
  • This study clarifies the importance and mechanism of antisense RNA action in biological rhythms.