The role of epigenetics in Alzheimer's disease

Neurodegenerative diseases are debilitating and incurable condition resulting in the progressive degeneration of nerve cells which causes problems with movement or mental functioning. Alzheimer's disease is the most common form of dementia and an irreversible neurodegenerative disorder. The mechanism of Alzheimer's disease is still unknown. The changes in the primary DNA sequence due to heritable alterations in the gene are known as epigenetics. The most studied epigenetic mechanisms are DNA methylation, histone modifications, and noncoding RNAs. Therefore, this change triggers the alterations in the transcriptional level of genes which are involved in the pathogenesis of Alzheimer's disease. Over the past decade, it is progressively clear that the epigenetic mechanisms play an important role in the pathogenesis of Alzheimer's disease. The literature search was performed on reviews addressing the topics in the databases PubMed and Google Scholar. This review focuses on the three major epigenetic mechanisms and their role in the pathogenesis of Alzheimer's disease.