Disrupted Body Clocks May Play Key role in Alzheimer’s Advancement, New Research Reveals
Alzheimer’s disease is a complex condition, and recent research from Washington University School of Medicine is shedding light on a surprising new piece of the puzzle: the brain’s internal clock, or circadian rhythm. A groundbreaking study reveals how disruptions to this daily cycle can significantly impact brain health, particularly in relation to amyloid plaque buildup – a hallmark of Alzheimer’s.
For years, scientists have understood that sleep disturbances are common in Alzheimer’s patients. This study, published in Nature Neuroscience, goes further, demonstrating that circadian disruption doesn’t just correlate with the disease, it actively reprograms gene activity in key brain cells.
Specifically, the research team focused on microglia and astrocytes – the brain’s resident immune cells and support cells, respectively.they found that disrupted circadian rhythms caused changes in these cells that differed from those seen with normal aging. These changes impacted the cells’ ability to function optimally, including clearing away toxic waste like amyloid.
The study pinpointed that circadian disruption throws a wrench into the orderly processes within these cells. Instead of a coordinated effort to clear debris, the process becomes scattered and inefficient. This is particularly concerning as microglia are crucial for breaking down amyloid,the protein that forms the plaques associated with Alzheimer’s.
Interestingly, the presence of amyloid itself appears to create new, abnormal rhythms in hundreds of genes not normally governed by the circadian clock. Many of these genes are involved in the brain’s inflammatory response, suggesting a vicious cycle were amyloid triggers inflammation, which further disrupts the circadian rhythm, and so on.
These findings open exciting new avenues for therapeutic intervention. Researchers are now exploring ways to manipulate the circadian clock within microglia and astrocytes – strengthening, weakening, or even temporarily switching it off in specific cell types. The ultimate goal is to optimize the brain’s internal timing to prevent amyloid accumulation and mitigate the progression of Alzheimer’s disease.
“We have a lot to learn,but the potential to target circadian cycles represents a promising new strategy for supporting healthy brain function and preventing this devastating disease,” says Dr.Erik Musiek,lead author of the study.
Study Details:
* Title: A glial circadian gene expression atlas reveals cell type and disease-specific reprogramming in response to amyloid pathology or aging.
* Journal: Nature Neuroscience
* Published: October 23,2025
* DOI: 10.1038/s41593-025-02067-1
* Funding: National Institute on Aging (R01AG054517, T32AG058518), National Institute of Neurological Disorders and Stroke (R01NS102272), and National Institutes of Health (R00AG061231).
About WashU Medicine:
Washington university School of Medicine in St. Louis is a leading academic medical center dedicated to biomedical research, patient care, and education. With a robust NIH research funding portfolio – the second largest among U.S. medical schools – WashU Medicine consistently invests over $1 billion annually in innovation and training. Its faculty practice staffs Barnes-Jewish and St. Louis Children’s Hospitals, alongside Siteman Cancer Center, providing exceptional care to patients throughout the region.