A new study from the University of California, Irvine reveals that women with Down syndrome display more advanced Alzheimer’s disease pathology than men at the time of diagnosis, despite both sexes receiving diagnosis at similar ages.
Published in Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association, the research offers critical insights that could reshape treatment strategies for Alzheimer’s in this vulnerable population and potentially beyond. The study was funded by the National Institutes of Health.
Alzheimer’s disease is the leading cause of death among individuals with Down syndrome, who are genetically predisposed to develop the disease earlier in life compared to the general population.
While prior research has indicated that women with Down syndrome may live longer with dementia than their male counterparts, few studies have investigated sex-based differences in the underlying brain pathology.
Researchers analyzed postmortem brain tissue from the UC Irvine Alzheimer’s Disease Research Center Brain Tissue Repository and the NIH NeuroBioBank, focusing on levels of two key Alzheimer’s-related proteins: beta-amyloid and phosphorylated tau.
The findings suggest that women with Down syndrome carry a significantly higher burden of these proteins, particularly in the occipital lobe—a brain region typically affected later in the disease progression in both Down syndrome and sporadic Alzheimer’s disease (the common late-onset form without clear genetic causes).
This discovery underscores the importance of adopting sex-specific approaches in Alzheimer’s research and treatment development, especially in clinical trial design.
“Understanding the selective vulnerabilities within the brain that differ between women and men is essential for improving treatment outcomes,” said Elizabeth Andrews, Ph.D. candidate and lead author of the study. “Recognizing sex-specific risk factors, many of which are modifiable, will be a critical step forward.”
The research team plans to further explore whether these sex differences extend to other dementia-related pathologies, such as blood vessel integrity and white matter connectivity, and how these correlate with biomarker data collected during patients’ lives. These investigations aim to advance precision medicine, ultimately enabling more personalized prevention and care strategies for Alzheimer’s disease.
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