The epigenome is the totality of epigenetic mechanisms that decide which genes are active in a cell and which are not. Changes in internal or environmental conditions, such as nutrition, stress, or drugs, can leave behind epigenetic patterns. …
Epigenetic modifications are heritable and potentially reversible changes in gene expression that do not require changes to the actual DNA sequence. By taking advantage of these modifications, researchers believe it is possible to mediate environmental signals and provide a link between susceptibility genes and environmental factors in the cause of cancer. However, it should be noted that any protective effect is unlikely due to a single dietary component and thus, the identification of specific relevant compounds and metabolites is necessary. Metabolism can also play a large role in affecting the potential to induce epigenetic changes. …
In human spermatozoa, these tiny RNAs are epigenetically regulated (by changes in the genome that do not alter the DNA sequence, such as DNA methylation) and play a critical role in male germline development. Importantly, these RNAs have also been detected in human cancer cells. In a work published in the January 2014 issue of Epigenetics, which is entirely devoted to "Non-coding RNAs in Epigenetic Regulation," the researchers asked if in their natural functional context (the normal human testis) these small RNAs undergo aberrant epigenetic regulation, compromising their function and contributing to the transformation of cells into testicular tumor cells. …
Scientists call this Jekyll-and-Hyde molecule NF-kappa B. In healthy cells, it is a powerful "first responder," a vital part of the body’s immune and inflammatory responses. It spends most of its life in the cell’s cytoplasm, quietly awaiting orders. …