Link Between Aging and Alzheimer’s Disease through Epigenetics
Introduction to Epigenetics and Alzheimer’s Disease
Recent research has explored the connection between aging and gene expression in Alzheimer’s disease through the lens of epigenetics. Aging is the primary risk factor for the development of Alzheimer’s disease, which is the leading cause of dementia among older adults. Certain genetic changes may heighten the risk of Alzheimer’s, yet the molecular processes linking aging to Alzheimer’s remain poorly understood.
Research Overview from the University of Pennsylvania
Researchers at the University of Pennsylvania investigated the role of epigenetic changes in aging and Alzheimer’s disease. Epigenetics refers to the biological mechanisms that regulate gene activity, including modifications to histones—proteins that interact with DNA to influence gene expression.
In a study published in *Nature Neuroscience*, the focus was on a specific histone modification known as H4K16ac. Prior research indicated that this modification might play a role in brain aging.
Study Methodology
The study utilized postmortem brain tissue samples from the Center for Neurodegenerative Disease Research. The samples were categorized into three groups: “old” cognitively normal subjects with an average age of 68 years, “young” cognitively normal subjects averaging 52 years, and subjects diagnosed with Alzheimer’s disease, also around 68 years old.
Findings on H4K16ac Modification
The findings revealed that both aging and Alzheimer’s disease were linked to alterations in H4K16ac. Interestingly, while normal aging was associated with an increase in H4K16ac, subjects with Alzheimer’s disease exhibited a decrease in this modification. Moreover, some changes in H4K16ac among Alzheimer’s patients were contrary to those observed in normal aging. This challenges the common assumption that cognitive decline arises from an amplification of the natural aging process, indicating instead a dysregulation of gene expression relevant to Alzheimer’s.
Implications for Alzheimer’s Treatment and Prevention
These results highlight the potential of epigenetics in influencing the changes associated with normal aging, which may offer a protective effect against Alzheimer’s disease. Researchers are optimistic that this protective aspect can be enhanced, providing a novel avenue for treatment and prevention strategies.
References
Nativio R, Donahue G, Berson A, et al. Dysregulation of the epigenetic landscape of normal aging in Alzheimer’s disease. Nat Neurosci. 2018. doi:10.1038/s41593-018-0101-9
Fyfe I. Epigenetics links ageing with Alzheimer disease. Nat Rev Neurol. 2018. doi:10.1038/nrneurol.2018.36