AQP4 gene, sleep affect Alzheimer's risk
Certain AQP4 gene variants and poor sleep habits are linked to faster Alzheimer's-related brain changes, pointing to personalized prevention approaches.
New research from Edith Cowan University shows that specific genetic variants and sleep habits interact to influence early brain changes associated with Alzheimer's disease. The study, published in Alzheimer's & Dementia, focused on the aquaporin-4 (AQP4) gene, which regulates brain fluid movement and overnight waste removal.
Researchers examined 13 common variants of the AQP4 gene alongside self-reported sleep patterns, brain scans, and cognitive performance. "Our study shows that individuals carrying certain AQP4 variants showed faster grey matter loss when they reported shorter sleep," says researcher Ayeisha Milligan Armstrong, PhD.
The Gene-Sleep Interaction
The AQP4 gene helps regulate the movement of fluid through the brain, supporting its built-in waste removal system. This system is most active overnight and is thought to help clear proteins linked to Alzheimer's disease.
"It's not just which genes you carry, it's how those genes interact with the world around you," Armstrong explains. "The same variant can look protective or detrimental depending on how someone is sleeping."
For some participants, taking longer to fall asleep was linked to changes in brain structure associated with reduced brain volume. The study also found that patterns of cognitive performance over time differed in people experiencing sleep disturbances.
Toward Personalized Prevention
Researcher Tenielle Porter, PhD, notes that while poor sleep and Alzheimer's risk have been linked, this study suggests a more targeted approach is needed. "Rather than assuming everyone at risk follows the same pathway, a more targeted and personalised approach to Alzheimer's prevention may be needed," Porter says.
However, Porter cautions that the field is not yet at the point of recommending genetic testing based on these findings. "Our findings need replication in larger and more diverse cohorts," she states.
The study recommends genetics-informed clinical trials to determine whether changing sleep patterns can offset genetic risk and alter long-term brain outcomes related to Alzheimer's disease. This research direction aims to identify who is most vulnerable and who might benefit most from specific lifestyle interventions.
Simon Laws, PhD, director and professor at the Centre for Precision Health, says the findings move science closer to understanding why some people decline faster than others, even with similar risk profiles. "Identifying who is most vulnerable, and who is most likely to benefit from a particular lifestyle intervention, is where precision health needs to go rather than treating everyone at risk of Alzheimer's the same way," Laws concludes.
