TET enzymes, which demethylate DNA, are 2-oxoglutarate dependent enzymes. 2-oxoglutarate is synthesized by the citric acid cycle. Mutation of genes for enzymes in the citric acid cycle can inhibit TET enzymes, thereby dysregulating epigenetic mechanisms.
Iron regulates enzymes is the TCA cycle. Dysregulation of iron metabolism could dysregulate the TCA cycle resulting in epigenetic dysregulations.