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Synaptic BMAL1 phosphorylation controls circadian hippocampal plasticity.

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The circadian clock protein BMAL1 is repurposed to synapses, regulating memory formation by controlling CaMKIIα activity. This synaptic localization of phosphorylated BMAL1 (pBMAL1(S42)) gates the daily timing of brain plasticity.

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Area of Science:

  • Chronobiology
  • Neuroscience
  • Molecular Biology

Background:

  • Circadian rhythms significantly impact cognitive functions, including long-term memory.
  • The molecular mechanisms linking circadian clocks to synaptic plasticity are not fully understood.
  • The core circadian clock relies on a transcription-translation feedback loop (TTFL) involving the BMAL1 transcription factor.

Purpose of the Study:

  • To investigate the role of the circadian clock protein BMAL1 in synaptic function and memory.
  • To elucidate the molecular mechanisms by which circadian rhythms influence synaptic plasticity.

Main Methods:

  • Investigated the rhythmic localization of BMAL1 to hippocampal synapses.
  • Examined the role of BMAL1 phosphorylation at Ser42 (pBMAL1(S42)) in synaptic processes.
  • Assessed the impact of pBMAL1(S42) on CaMKIIα autophosphorylation and CaMKIIα-dependent molecular interactions and long-term potentiation (LTP).

Main Results:

  • BMAL1 rhythmically localizes to hippocampal synapses, dependent on its phosphorylation at Ser42 (pBMAL1(S42)).
  • pBMAL1(S42) regulates the autophosphorylation of synaptic CaMKIIα.
  • Circadian rhythms of CaMKIIα-dependent molecular interactions and LTP are controlled by pBMAL1(S42), while global rest/activity behavior remains unaffected.

Conclusions:

  • The study proposes a model where BMAL1 is repurposed to synapses to locally regulate the circadian timing of synaptic plasticity.
  • Synaptic BMAL1, specifically its phosphorylated form, plays a critical role in gating memory formation processes according to the time of day.
  • These findings reveal a novel mechanism connecting the central circadian clock to cognitive functions at the synaptic level.