Disrupted RNA methylation pathway accelerates Alzheimer’s and Parkinson’s risks

A growing understanding of RNA biology is reshaping how scientists view the relationship between environmental toxicants, brain development, and neurodegenerative disease. A new review highlights the emerging importance of N6-methyladenosine (m6A), the most common RNA modification in cells, as a key regulator of nervous system development and a potential contributor to neurological damage caused by toxic environmental exposures.

Unlike changes to DNA itself, m6A modification influences how genetic information is processed after it is transcribed into RNA. By controlling the stability, translation and lifespan of messenger RNA, this reversible process helps regulate the formation and function of neurons, neural stem cells, and supporting glial cells, making it essential for normal brain development and maintenance.

The review describes how disruption of m6A regulation can interfere with the growth and specialization of neural stem cells, impair the formation of neuronal connections, alter myelin production, and influence immune activity within the brain. These widespread effects suggest that disturbances in RNA modification may have consequences across multiple stages of nervous system development and function.

The article also examines how abnormal m6A activity is associated with neurological conditions including Alzheimer's disease, Parkinson's disease, and epilepsy. Changes in RNA methylation appear to influence processes linked to memory, learning, neuronal survival, inflammation, oxidative stress and protein accumulation, providing a broader framework for understanding mechanisms involved in neurodegeneration.