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Twin studies in narcolepsy

M Partinen1, C Hublin, J Kaprio

  • 1Department of Neurology, Finnish Twin Cohort, University of Helsinki, Finland.

Sleep
|December 1, 1994
PubMed
Summary
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Narcolepsy is rarely seen in identical twins, even those with genetic markers like human leukocyte antigen DR2. This suggests environmental factors play a significant role in narcolepsy development.

Area of Science:

  • Genetics
  • Neurology
  • Sleep Medicine

Background:

  • Narcolepsy exhibits a strong genetic association with human leukocyte antigen (HLA) DR2 (DQB1-0602) and occasional familial clustering.
  • Previous reports documented 12 monozygotic twin pairs with narcolepsy, with limited concordance data and conflicting HLA-DR2 status.

Purpose of the Study:

  • To investigate the prevalence and concordance of narcolepsy in a large cohort of monozygotic twins.
  • To evaluate the role of genetic and environmental factors in the etiology of narcolepsy.

Main Methods:

  • A questionnaire study utilizing the validated Ullanlinna narcolepsy scale (UNS) was administered to 2,191 monozygotic twin pairs from the Finnish Twin Cohort.
  • Data analysis focused on identifying cases suggestive of narcolepsy among responding twin pairs.

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Main Results:

  • Despite a high response rate, not a single case suggestive of narcolepsy was identified among the studied monozygotic twins.
  • The findings indicate an extremely low occurrence of narcolepsy in monozygotic twins.

Conclusions:

  • Narcolepsy in monozygotic twins is exceptionally rare, challenging simple genetic inheritance models.
  • These results strongly support a multifactorial etiology for narcolepsy, emphasizing the significant influence of non-genetic environmental factors.