Epigenetics

Definition

Epigenetics refers to heritable changes in gene expression and chromatin structure that occur without changes to the underlying DNA nucleotide sequence. The primary epigenetic mechanisms include DNA methylation (addition of methyl groups to cytosine residues, typically at CpG dinucleotides), histone modification (acetylation, methylation, phosphorylation, and ubiquitination of histone tails that alter chromatin accessibility), and non-coding RNA regulation (including miRNAs and lncRNAs that modulate gene expression post-transcriptionally). Epigenetic marks are dynamically regulated by environmental signals, cellular metabolic state, and aging processes.

Research Context

Epigenetic regulation is increasingly studied as a mechanism through which research peptides produce durable changes in gene expression patterns. Pinealon is studied for its capacity to directly interact with chromatin in neuronal models and modulate gene expression at the epigenetic level. Sirtuins, activated by NAD+ research compounds, are histone deacylases that regulate chromatin structure and gene expression genome-wide. The field of epigenetic aging research uses DNA methylation clocks to quantify biological age, providing a functional readout for longevity compound research at the epigenetic level.