Large studies link body-clock disruption to a depression subtype

· Science · Australia

Researchers at the University of Sydney have identified a new subtype of depression called 'circadian depression,' using clinical and genetic data from more than 10,000 Australians. The subtype accounted for nearly a quarter of diagnoses in their study of people with severe, recurrent depression. A separate large study reported in Nature News concludes that body-clock disruptions contribute to about one in four cases of depression. Both findings support the idea that disturbed sleep-wake rhythms are not merely a symptom but a driver in a substantial share of cases, which could point toward treatments aimed at restoring circadian timing rather than mood chemistry alone.

Why it matters：If circadian disruption underlies a quarter of depression cases, drug developers and clinicians have a biologically defined target beyond conventional mood treatments.

Key points

  • The Sydney study used data from more than 10,000 Australians.
  • The subtype made up nearly a quarter of diagnoses in that severe, recurrent group.

Sources (original reporting)

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