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Regulation of circadian behavioural output via clock-responsive miR-276b

R Zhang1, J Du1, X Zhao1

  • 1Department of Entomology and MOA Key Lab of Pest Monitoring and Green Management, College of Plant Protection, China Agricultural University, Beijing, China.

Insect Molecular Biology
|November 1, 2020
PubMed

Insights

MicroRNAs regulate sleep and circadian rhythms. This study reveals miR-276b is crucial for maintaining these processes in fruit flies by targeting key genes and interacting with the CLOCK pathway.

Area of Science:

  • Molecular Biology
  • Neuroscience
  • Chronobiology

Background:

  • MicroRNAs (miRNAs) are small non-coding RNAs with diverse regulatory functions.
  • The precise roles of specific miRNAs in governing circadian rhythm and sleep remain incompletely understood.
  • Understanding these mechanisms is vital for addressing sleep disorders and circadian rhythm disruptions.

Purpose of the Study:

  • To elucidate the function of miR-276b in the regulation of circadian rhythm and sleep.
  • To identify the target genes and molecular pathways influenced by miR-276b.
  • To investigate the expression patterns and regulatory interactions of miR-276b within the Drosophila brain.

Main Methods:

  • Utilized Drosophila melanogaster as a model organism.
  • Generated miR-276b deletion mutant and overexpressing fly lines.
  • Performed gene expression analysis, promoter analysis, and in situ hybridization.
  • Investigated the effects of miR-276b manipulation on sleep behavior and circadian rhythms.

Main Results:

  • miR-276b is essential for maintaining normal sleep duration and circadian rhythm.
  • miR-276b directly targets tim, npfr1, and DopR1 genes.
  • miR-276b expression is regulated by CLOCK and participates in a negative feedback loop involving CLK/CYC-TIM/PER.
  • miR-276b is broadly expressed in Drosophila clock neurons and central complex regions, influencing sleep when dysregulated in specific tissues.

Conclusions:

  • miR-276b plays a critical role in the intricate regulation of circadian rhythm and sleep.
  • This miRNA acts as a key molecular link between clock genes and sleep-wake cycles.
  • The findings highlight miR-276b as a potential therapeutic target for sleep and circadian rhythm disorders.
Keywords:
Drosophilacircadian rhythmclockmiR-276bsleep

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