Mitochondrial DNA Mutations and Their Impact on Aging

Abstract

Deterioration of mitochondria has long been linked to aging and age-related disorders; they are essential for cellular energy production, metabolism, and apoptosis. Because of its close proximity to reactive oxygen species (ROS), restricted repair mechanisms, and fast replication rate, mitochondrial DNA (mtDNA) is far more prone to mutations than nuclear DNA. Cellular senescence and tissue degeneration are caused by metabolic imbalance, reduced ATP synthesis, increased ROS production, and the disruption of oxidative phosphorylation caused by the accumulation of mtDNA mutations over time. Research in both humans and animals’ points to mtDNA mutations as a key player in the aging process, with the potential to trigger oxidative stress and mitochondrial malfunction. Neurodegenerative illnesses, cardiovascular diseases, sarcopenia, and metabolic syndromes are just some of the age-related conditions that have been linked to these changes. Heteroplasmy, in which wild-type and mutant mitochondrial DNA reside in the same cell, also plays a significant role in how mitochondrial dysfunction develops and how quickly it manifests in aged tissues. Our knowledge of the role of certain point mutations, deletions, and copy number changes in mtDNA in the aging phenotype has been enhanced by developments in mitochondrial biology and next-generation sequencing. New therapeutic techniques, including gene editing, mitochondrial replacement therapy, and antioxidants targeted to mitochondria, show promise in reducing the harmful consequences of mtDNA mutations and postponing the start of age-related deterioration. delves into the molecular pathways that connect mtDNA mutations to aging, investigates their function in age-related illnesses, and addresses possible therapies that aim at mitochondrial health to encourage healthy aging and increase lifespan.