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Circadian clock regulator Bmal1 gates axon regeneration via Tet3 epigenetics in mouse sensory neurons

Author

Listed:
  • Dalia Halawani

    (Icahn School of Medicine at Mount Sinai)

  • Yiqun Wang

    (Icahn School of Medicine at Mount Sinai
    Second Affiliated Hospital of Xi’an Jiaotong University)

  • Aarthi Ramakrishnan

    (Icahn School of Medicine at Mount Sinai)

  • Molly Estill

    (Icahn School of Medicine at Mount Sinai)

  • Xijing He

    (Second Affiliated Hospital of Xi’an Jiaotong University
    Xi’an International Medical Center Hospital)

  • Li Shen

    (Icahn School of Medicine at Mount Sinai)

  • Roland H. Friedel

    (Icahn School of Medicine at Mount Sinai
    Icahn School of Medicine at Mount Sinai)

  • Hongyan Zou

    (Icahn School of Medicine at Mount Sinai
    Icahn School of Medicine at Mount Sinai)

Abstract

Axon regeneration of dorsal root ganglia (DRG) neurons after peripheral axotomy involves reconfiguration of gene regulatory circuits to establish regenerative gene programs. However, the underlying mechanisms remain unclear. Here, through an unbiased survey, we show that the binding motif of Bmal1, a central transcription factor of the circadian clock, is enriched in differentially hydroxymethylated regions (DhMRs) of mouse DRG after peripheral lesion. By applying conditional deletion of Bmal1 in neurons, in vitro and in vivo neurite outgrowth assays, as well as transcriptomic profiling, we demonstrate that Bmal1 inhibits axon regeneration, in part through a functional link with the epigenetic factor Tet3. Mechanistically, we reveal that Bmal1 acts as a gatekeeper of neuroepigenetic responses to axonal injury by limiting Tet3 expression and restricting 5hmC modifications. Bmal1-regulated genes not only concern axon growth, but also stress responses and energy homeostasis. Furthermore, we uncover an epigenetic rhythm of diurnal oscillation of Tet3 and 5hmC levels in DRG neurons, corresponding to time-of-day effect on axon growth potential. Collectively, our studies demonstrate that targeting Bmal1 enhances axon regeneration.

Suggested Citation

  • Dalia Halawani & Yiqun Wang & Aarthi Ramakrishnan & Molly Estill & Xijing He & Li Shen & Roland H. Friedel & Hongyan Zou, 2023. "Circadian clock regulator Bmal1 gates axon regeneration via Tet3 epigenetics in mouse sensory neurons," Nature Communications, Nature, vol. 14(1), pages 1-22, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40816-7
    DOI: 10.1038/s41467-023-40816-7
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    References listed on IDEAS

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