Abstract:
OBJECTIVE:To explore the causal relationships between sleep, major depressive disorder (MDD), and Alzheimer disease (AD). METHODS:We conducted bidirectional 2-sample Mendelian randomization analyses. Genetic associations were obtained from the largest genome-wide association studies currently available in UK Biobank (n = 446,118), Psychiatric Genomics Consortium (n = 18,759), and International Genomics of Alzheimer's Project (n = 63,926). We used the inverse variance-weighted Mendelian randomization method to estimate causal effects and weighted median and Mendelian randomization-Egger for sensitivity analyses to test for pleiotropic effects. RESULTS:We found that higher risk of AD was significantly associated with being a "morning person" (odds ratio [OR] 1.01, p = 0.001), shorter sleep duration (self-reported: β = -0.006, p = 1.9 × 10-4; accelerometer based: β = -0.015, p = 6.9 × 10-5), less likely to report long sleep (β = -0.003, p = 7.3 × 10-7), earlier timing of the least active 5 hours (β = -0.024, p = 1.7 × 10-13), and a smaller number of sleep episodes (β = -0.025, p = 5.7 × 10-14) after adjustment for multiple comparisons. We also found that higher risk of AD was associated with lower risk of insomnia (OR 0.99, p = 7 × 10-13). However, we did not find evidence that these abnormal sleep patterns were causally related to AD or for a significant causal relationship between MDD and risk of AD. CONCLUSION:We found that AD may causally influence sleep patterns. However, we did not find evidence supporting a causal role of disturbed sleep patterns for AD or evidence for a causal relationship between MDD and AD.
journal_name
Neurologyjournal_title
Neurologyauthors
Huang J,Zuber V,Matthews PM,Elliott P,Tzoulaki J,Dehghan Adoi
10.1212/WNL.0000000000010463subject
Has Abstractpub_date
2020-10-06 00:00:00pages
e1963-e1970issue
14eissn
0028-3878issn
1526-632Xpii
WNL.0000000000010463journal_volume
95pub_type
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