What Is Epigenetics and Can You Change Your Genes?

You cannot change the DNA sequence you inherited from your parents. But you can change whether — and how much — specific genes are expressed. This is the domain of epigenetics: the study of heritable changes in gene expression that do not involve changes to the underlying DNA sequence. Epigenetics has revolutionized our understanding of how environment, lifestyle, and experience interact with genetics to shape health, disease, and even which traits are passed to future generations.

The Basics: Dna Is Not Destiny

The human genome contains approximately 20,000–25,000 protein-coding genes. Every cell in your body (with some exceptions like immune cells and red blood cells) contains the same DNA. Yet a liver cell looks and functions completely differently from a neuron, a muscle cell, or a skin cell — despite sharing identical genetic instructions.

How? Through differential gene expression — different genes are turned on or off in different cell types. A liver cell expresses liver-specific genes while silencing muscle-specific ones; a neuron expresses neural genes while silencing everything else. The master regulatory system that controls this gene expression landscape — which genes are active and to what degree — is the epigenome.