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Basic Science and Pathogenesis.

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  • 1NIH, Bethesda, MD, USA.

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Dipeptidyl Peptidase-Like 6 (DPP6) knockout mice exhibit sleep disturbances and seizures, linked to Alzheimer's disease pathology. These findings highlight DPP6's crucial role in neurological function and dementia.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Dipeptidyl Peptidase-Like 6 (DPP6) is a voltage-gated potassium channel auxiliary subunit with known roles in neuronal development, learning, memory, and Alzheimer's disease (AD).
  • Novel amyloid-β (Aβ) structures were observed in the hippocampus of aging DPP6 knockout (DPP6-KO) mice, originating from degenerating presynaptic terminals.
  • DPP6-KO mice display increased Aβ and tau pathologies, neuroinflammation, and sleep disturbances compared to wild-type (WT) controls.

Purpose of the Study:

  • To investigate the neurological consequences of DPP6 deficiency in aging mice.
  • To characterize sleep patterns and seizure activity in DPP6-KO mice.
  • To explore the link between DPP6, Aβ pathology, and potential Alzheimer's disease/dementia phenotypes.

Main Methods:

  • In vivo surgical implantation of the HD-X02 telemetry system (DSI) for monitoring physiological parameters.
  • Behavioral and electrophysiological assessments in 12-month-old DPP6-KO and WT mice.
  • Administration of anti-seizure medication levetiracetam (LEV) to evaluate its effect on epileptiform events.

Main Results:

  • DPP6-KO mice exhibited sleep disorders, including increased wake and REM sleep and decreased NREM sleep during the light-on phase.
  • Aging DPP6-KO mice showed significantly increased prevalence and duration of spike train activity, spike wave discharges, and nonconvulsive seizures.
  • A notable increase in epileptiform spike events was observed in DPP6-KO mice, which were subsequently suppressed by levetiracetam.

Conclusions:

  • DPP6-KO mice present with significant sleep disorders and seizure activity, characterized by epileptiform events.
  • These findings reinforce the critical role of DPP6 in maintaining normal sleep-wake cycles and preventing seizure susceptibility.
  • The study provides further evidence supporting a role for DPP6 in the pathophysiology of Alzheimer's disease and dementia.