Neuroepigenetics of the Environmental Exposome

Background: Neuroepigenetics studies the molecular mechanisms that regulate gene expression in the nervous system without altering the DNA sequence. The environmental exposome has emerged as a key factor influencing neuronal plasticity and brain homeostasis, contributing to vulnerability to neurodegeneration. Review Summary: This narrative review analyzes the role of neuroepigenetic reprogramming as a central mechanism linking chronic environmental exposures with neurodegenerative diseases. Evidence indicates that alterations in DNA methylation, histone remodeling, and microRNA regulation contribute to mitochondrial dysfunction, oxidative stress, and chronic neuroinflammation. These mechanisms are critically involved in the pathogenesis of Alzheimer disease, Parkinson disease, and amyotrophic lateral sclerosis. Conclusions: Neuroepigenetics represents a central mechanistic axis in neurodegeneration by integrating environmental exposures with intrinsic biological processes. This framework offers new opportunities for the development of early biomarkers and targeted preventive and therapeutic strategies.