Increased neuronal activity restores circadian function in Drosophila models of C9orf72-ALS/FTD

Feb 20, 2026iScience

Boosting nerve cell activity improves daily rhythm function in fruit fly models of C9orf72-linked ALS and FTD

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Abstract

Circadian rhythmicity and period length were altered in a repeat number-, dosage-, expression pattern-, and age-dependent manner.

  • Circadian rhythm disruptions are observed in models of C9orf72-ALS/FTD.
  • Lower levels of the neuropeptide PDF, which regulates circadian rhythms, were found.
  • Decreased projection complexity and reduced neuronal activity were noted in PDF-expressing neurons.
  • Increased neuronal activity could significantly rescue mild circadian dysfunction across different models and ages.
  • These findings suggest a link between reduced neuronal activity and circadian deficits in C9orf72-ALS/FTD.

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