Environmental factors such as stress and diet can impact our epigenome, which in turn affects the aging process.
Epigenetic changes play a significant role in the aging process affecting various aspects of our genome. These changes alter the accessibility of genetic material, leading to disease and decreasing longevity. Lifespan is largely influenced by epigenetic factors rather than being solely determined by genetics. Environmental factors, including diet and stress, can impact lifespan through changes in our epigenetic information. Overall, understanding aging mechanisms and the reversible nature of epigenetic changes offers promising possibilities for developing therapies to target aging and related diseases.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4966880/
Epigenetics Basics
Epigenetics is the way in which your environment affects how your genes are expressed. Epigenetics do not change your genome/DNA sequence; they just decide which genes speak louder and which ones are just a whisper. The Greek root “epi” means above, so it explains what happens “above” or around your genome—not the genome itself. In other words, what you consume and your lifestyle affect what parts of your genome are expressed.
To understand which parts of your genome are expressed, we must explain what DNA methylation is and how it plays a part in protein synthesis. Protein synthesis has two steps: one is transcription, and the other is translation. For now, the only part we need to worry about is transcription, which is when DNA is transcribed into mRNA. RNA polymerase runs along the DNA strand and makes a copy or transcribes a corresponding RNA transcript, which is called mRNA. DNA methylation can inhibit transcription (especially when it occurs in gene promoter regions) by adding a methyl group to parts of the genome. Think of a methylated group as a little bump in the road on the DNA, and that bump affects what genes are expressed.
Demethylation is when the methylated genes are no longer methylated and therefore can be properly transcribed. In other words, the bumps are smoothed out on the DNA road, so to speak.
Histones are proteins that are rolled up and wound around the DNA strand. Imagine a histone as a spool for the DNA string to wrap around. Histones can either inhibit or activate transcription depending on where the methylation occurs.
Acetyl groups are attached to certain parts of the histones and loosen up the DNA so the transcription flow is smoother. It changes how tightly the histones grab the DNA. Deacetylation is the opposite of acetylation because the acetyl groups leave, and the DNA becomes more tightly wound, which makes it more difficult for transcription and protein synthesis to occur. Again, imagine a road, but it is full of traffic, so it is more difficult for cars to get through the congestion.
Chromatin is DNA that is packed inside human cells. Chromatin remodeling is when chromatin is moved from a condensed state to an accessible state in which transcription can take place. Chromatin remodeling is integral to helping transcription happen. These processes help regulate gene expression and maintain normal cellular function.
DNA methylation, histones, and chromatin are all ways in which the body starts to age because transcription can not properly take place. DNA methylation, histones, and chromatin are normal and essential for gene regulation, but changes or dysregulation in these systems over time can contribute to age-associated shifts in gene expression. Aging plays a part in this because the body may become less precise in maintaining and regulating these epigenetic marks over time.
Redox Influence
Our cells are constantly responding to their environment. One way they do this is through redox processes, which are part of how cells sense change and adapt at a molecular level.
Redox balance plays a role in how DNA is accessed and used by the cell. Rather than changing DNA itself, redox conditions can influence the cell environment around DNA, including proteins that help regulate when certain genes are more or less active. This regulation is part of what scientists refer to as epigenetic processes: natural mechanisms that help cells respond to activity, stress, and normal aging without altering genetic code.
Every day experiences, such as physical activity, create short-term oxidative signals. These signals are a normal part of how cells adapt and build resilience over time. Through redox-related signaling, cells can adjust how they respond to future challenges, supporting balance and flexibility at the cellular level.
Redox signaling does not eliminate all stress, nor does it control genes directly. Instead, it is part of the body’s natural communication system that helps interpret their environment and adjust their behavior as part of healthy function over time.
