A gene involved in the brain’s overnight cleaning system may change how strongly poor sleep affects Alzheimer’s-related brain changes. The findings point toward more personalized prevention strategies based on both genetics and sleep habits.
Poor sleep may be especially damaging for people carrying certain genes linked to the brain’s nighttime waste-removal system.
New research from Edith Cowan University (ECU) suggests that sleep habits and genetics may interact to influence subtle brain and cognitive changes associated with Alzheimer’s disease years before noticeable symptoms develop.
The study, conducted by ECU’s Centre for Precision Health (CPH), examined the aquaporin-4 (AQP4) gene. This gene helps control the movement of fluid through the brain, a function that supports the organ’s natural waste-clearing system.
The brain’s waste-removal process becomes especially active during sleep. Scientists believe it helps clear potentially harmful proteins, including proteins associated with Alzheimer’s disease.
Researchers found that the effects of sleep appeared to vary depending on which version of the AQP4 gene a person carried.
“Our study shows that individuals carrying certain AQP4 variants showed faster grey matter loss when they reported shorter sleep,” researcher Dr. Ayeisha Milligan Armstrong said.
“It’s not just which genes you carry — it’s how those genes interact with the world around you. The same variant can look protective or detrimental depending on how someone is sleeping. That’s important, because sleep is one of the few modifiable factors people can actually act on.”
Grey matter contains many of the brain cells involved in memory, decision-making, movement, and other essential functions. A decline in grey matter volume can be a sign of structural changes in the brain.
https://www.sciencedaily.com/releases/2026/07/260729051529.htm
