The sleep disorder canine narcolepsy is caused by a mutation in the hypocretin (orexin) receptor 2 gene.
Level 5 - mechanism / opinion, no new human data
Animal genetic study (preclinical bench/animal research)
PubMed 10458611 · doi:10.1016/s0092-8674(00)81965-0
What was done
Positional cloning was used to identify the autosomal recessive gene mutation responsible for narcolepsy in a canine model characterized by daytime sleepiness, cataplexy, and rapid eye movement (REM) sleep transitions.
What was found
The abstract reports no numerical data. It established that canine narcolepsy is caused by disruption of the hypocretin (orexin) receptor 2 gene (*Hcrtr2*).
Why it matters
This study identified hypocretin neuropeptides as essential regulators of sleep architecture, uncovering a major pathway underlying narcolepsy and opening new therapeutic targets.
Limits
The investigation was conducted exclusively in a canine model, and the abstract provides no sample size or specific genetic sequence metrics. Findings in genetic canine narcolepsy do not fully capture human narcolepsy, which is typically sporadic and involves autoimmune loss of hypocretin-producing neurons rather than receptor mutations.
Cited by
- supports Seiji Nishino and Emmanuel Mignot discovered the genetic basis of narcolepsy in the orexin/hypocretin system.
- supports Emmanuel Mignot and Seiji Nishino discovered the genes underlying narcolepsy.