SuperAgers' Exceptional Memory Cannot Be Explained by Low Alzheimer's Genetic Risk, Study Finds
核心洞察
A new study published in Alzheimer's Research & Therapy demonstrates that SuperAgers cannot be distinguished from cognitively average peers based on APOE or Alzheimer's polygenic risk scores.
Researchers analyzed 142 SuperAgers and 89 cognitively average older adults across five U.S. and Canadian sites, finding no increased prevalence of rare protective genetic variants among SuperAgers.
The findings reinforce that preserving cognitive health involves more than reducing Alzheimer's disease (搜索) risk alone, pointing toward protective biological, behavioral, and social pathways.
A select group of older adults known as SuperAgers—individuals who reach their 80s and 90s while retaining memory performance as good as or better than people in their 50s and 60s—have long fascinated researchers. Now, a new study published in Alzheimer's Research & Therapy provides a definitive answer to a lingering question: their exceptional cognitive aging cannot be explained simply by having inherited very little genetic risk for Alzheimer's disease (搜索).
"If that were true, identifying SuperAgers might be as simple as performing genetic testing rather than the comprehensive cognitive evaluations we currently use," said Emily Rogalski, PhD, director of the Healthy Aging & Alzheimer's Research Care (HAARC) Center at the University of Chicago, who established the definition of SuperAging in 2008.
The study, led by researchers at the HAARC Center and the Translational Genomics Research Institute (TGen), part of City of Hope (搜索), examined a diverse cohort from five regional sites across the U.S. and Canada, comprising 142 SuperAgers and 89 cognitively average peers.
Genetic Risk Profiles Prove Indistinguishable
Using DNA extracted from blood samples, the research team examined the APOE gene—the strongest genetic risk factor for Alzheimer's disease (搜索)—and calculated three polygenic risk scores, which aggregate thousands of genetic variants associated with inherited Alzheimer's disease risk. The results were unambiguous: SuperAgers could not be distinguished from cognitively average older adults based on either APOE or Alzheimer's polygenic risk scores.
Even when the researchers examined rare genetic protective variants previously associated with resilience against Alzheimer's disease (搜索), they found no increased prevalence among SuperAgers.
"This study establishes an important boundary for Alzheimer's disease (搜索) genetics," said Matt Huentelman, PhD, professor and director in TGen's Early Detection and Prevention Division and co-senior author with Rogalski. "Common genetic risk factors captured by APOE and current polygenic risk scores do not explain the SuperAging phenotype. Future work should move beyond disease-risk models and investigate the broader biological, environmental, and experiential pathways that contribute to exceptional cognitive aging."
Beyond Disease Risk: The Search for Protective Factors
The findings carry significant implications for how researchers approach cognitive aging. "For many years, aging research has focused on identifying factors that increase the risk of disease," said co-first author Ignazio S. Piras, PhD, associate professor in TGen's Early Detection and Prevention Division. "Those studies are critically important, but the absence of risk factors does not necessarily mean someone possesses the protective factors that support exceptional brain health. This study helps demonstrate that distinction."
Co-first author Ana Capuano, PhD, director of the biostatistics core at the HAARC Center, emphasized the broader clinical implications: "The findings reinforce that preserving cognitive health involves more than reducing Alzheimer's disease (搜索) risk alone. Understanding the biological, behavioral, and social factors that promote exceptional cognitive aging may ultimately complement traditional disease-focused approaches and help inform more personalized strategies for supporting brain health across the lifespan."
A Multidisciplinary Path Forward
The research team outlined that future investigations will require a multidisciplinary approach combining detailed cognitive assessments with brain imaging, blood biomarkers, genetics, neuropathology, immune profiling, sleep and activity monitoring, social and environmental measures, and other indicators of whole-person health.
The study reinforces a hopeful message: memory decline is not inevitable, and some people can—and do—maintain remarkably youthful memory well into their 80s and beyond. The ongoing search for how and why continues with the help of SuperAger research participants, whom the researchers describe as extraordinary partners in discovery who have generously contributed their time over many years.
This work was supported by the National Institute on Aging (U19AG073153), the McKnight Brain Research Foundation through the SuperAging Research Initiative, and the Simons Foundation, along with participants, families, and collaborating investigators across five research sites.