Gene Variants, Sleep Habits Linked to Alzheimer's Risk

A new study published in Alzheimer's & Dementia by Edith Cowan University (ECU) in Western Australia has identified a link between variants of the aquaporin-4 (AQP4) gene and sleep habits, influencing brain structure and cognitive performance in relation to Alzheimer's disease risk. The research indicates that the effectiveness of the brain's waste-clearance system, which is most active during sleep and helps flush out Alzheimer's-associated proteins, is dependent on both an individual's genetic makeup and their sleep patterns.

Specifically, the study found that individuals carrying certain AQP4 variants experienced faster grey matter loss when they reported shorter sleep durations. Ayeisha Milligan Armstrong, a postdoctoral research fellow at ECU's Centre for Precision Health, stated that the interaction between genes and environmental factors like sleep is crucial, suggesting that the same genetic variant can have protective or detrimental effects depending on sleep quality. This highlights that genetic predisposition alone may not determine Alzheimer's risk.

The study analyzed data from 351 older adults participating in the Australian Imaging, Biomarkers, and Lifestyle (AIBL) study. The AIBL study, initiated in 2006, collects data on Alzheimer's biomarkers and lifestyle factors from its participants every 18 months, with a total of 3,045 participants to date. The participants in the ECU study were in their mid-70s and did not have diagnosed cognitive impairments, but they exhibited early signs of amyloid buildup, a protein accumulation linked to Alzheimer's disease that disrupts brain cell communication.