期刊
ALZHEIMERS & DEMENTIA
卷 13, 期 6, 页码 689-700出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jalz.2016.10.003
关键词
DNA methylation; Circadian rhythms; Methylation cycles; Alzheimer's disease; BMAL1; Neurodegeneration; Epigenetics; Fibroblasts; Circadian clock; Brain
资金
- University of California Academic Senate grant [RN127H]
- UCSD Shiley-Marcos ADRC NIA [P50 AG05131]
- Alzheimer's Association [NIRGD-13-284795]
- VA Career development award [1IK2BX001275]
- National Institutes of Health [P30AG10161, RF1AG15819, R01AG17917, R01AG36042, R01AG36836]
- Canadian Institutes of Health Research [MSH136642]
Introduction: Circadian alterations are prevalent in Alzheimer's disease (AD) and may contribute to cognitive impairment, behavioral symptoms, and neurodegeneration. Epigenetic mechanisms regulate the circadian clock, and changes in DNA methylation have been reported in AD brains, but the pathways that mediate circadian deregulation in AD are incompletely understood. We hypothesized that aberrant DNA methylation may affect circadian rhythms in AD. Methods: We investigated DNA methylation, transcription, and expression of BMAL1, a positive regulator of the circadian clock, in cultured fibroblasts and brain samples from two independent cohorts of aging and AD. Results: DNA methylation modulated rhythmic expression of clock genes in cultured fibroblasts. Moreover, rhythmic methylation of BMAL1 was altered in AD brains and fibroblasts and correlated with transcription cycles. Discussion: Our results indicate that cycles of DNA methylation contribute to the regulation of BMAL1 rhythms in the brain. Hence, aberrant epigenetic patterns may be linked to circadian alterations in AD. (C) 2016 the Alzheimer's Association. Published by Elsevier Inc. All rights reserved.
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