Epigenetic Marks

Definition

Epigenetic marks are chemical modifications to DNA that can turn genes on or off. They play a key role in development and heredity.

Analogy

Think of epigenetic marks like light switches in your house. Just as you can turn lights on or off without changing the wiring, epigenetic marks can activate or deactivate genes without altering the DNA sequence.

Related terms

DNA Methylation: A process by which methyl groups are added to the DNA molecule, often leading to a change in gene function.

Histone Modification: Changes to proteins called histones that help organize DNA within the cell nucleus; these changes can influence gene activity.

Genomic Imprinting: An epigenetic phenomenon where certain genes are expressed in a parent-of-origin-specific manner.