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You’ve probably heard someone talk about “turning genes on and off,” as if your DNA works like a set of light switches you can flip whenever you want. It’s a common way to describe epigenetics, but it’s not quite accurate, and the real story is more interesting.
Your Genes Are the Blueprint. Epigenetics Decides What Gets Built.
Your genes are a set of instructions stored in nearly every cell of your body, and they don’t change over the course of your life. What can change is whether, and how strongly, those instructions actually get used. Scientists call this epigenetics, literally “on top of” genetics.
Much of this happens through DNA methylation, where small chemical tags attach to specific spots on your DNA and quiet a gene down, almost like a dimmer switch instead of an on/off toggle. Another layer comes from the proteins your DNA is wound around. When these proteins loosen their grip, a gene becomes easier for your cellular machinery to reach and use, and when they tighten, that gene becomes harder to access. Research shows that DNA methylation and this protein packaging system work together and often take cues from each other.
This is why your heart cells and your liver cells can carry the exact same genetic code and still do completely different jobs. It’s not the code that’s different. It’s which parts of that code are actively being read.
Can Experiences Really Be Passed Down?
One of the more surprising findings in this field involves a study on mice. Researchers trained male mice to associate a specific scent with a mild, unpleasant stimulus. Later, they looked at the mice’s offspring, and even their grandoffspring, who had never encountered that scent themselves.
Both generations showed a heightened sensitivity to it, and when researchers examined the sperm DNA of the trained mice, they found a specific epigenetic signature tied to the gene responsible for detecting that scent.
It’s early science, and mouse findings don’t automatically translate to people. But it raises a compelling question. Some of what feels hardwired in us, certain sensitivities or stress responses, may have roots that reach back further than our own lived experience.
Why Your Mitochondria Deserve More Attention
Mitochondria are the small structures inside your cells responsible for producing energy, and they have an unusual origin story. Evolutionary evidence suggests they started out as free-living bacteria that were absorbed into our cells millions of years ago, and that ancestry is still visible today: mitochondria carry their own DNA and use protein-building machinery that closely resembles a bacterium’s.
That similarity comes with a tradeoff. Many antibiotics work by disrupting how bacteria build proteins, and because mitochondria share that same machinery, they can get caught in the crossfire. This is one reason people sometimes notice their energy doesn’t fully bounce back after a course of antibiotics. It’s not in your head. Your mitochondria may genuinely need extra support to recover.
Small Inputs, Real Signals
Epigenetics also depends on a steady supply of methyl groups, the same small chemical units used in DNA methylation. Your body draws on this same pool for other jobs too. Making creatine, for example, is one of the single largest consumers of methyl groups in the body. When that demand runs high, whether from diet, stress, or your unique biochemistry, it can shift how many methyl groups are left over for the processes that regulate gene expression.
This is exactly why MyHappyGenes® doesn’t stop at telling you which genetic variants you carry. We look at your biochemistry as an interconnected system, because your genes, your methylation capacity, and your mitochondrial health are all talking to each other.
The Hopeful Part
Here’s what all of this means in practice: you can’t change your genes, and you don’t need to. What you have far more influence over is how those genes are expressed, day to day, based on the cofactors your body has available. That’s not a metaphor. It’s biochemistry.
Understanding your own genetic variants through MyHappyGenes® testing gives you a starting point for figuring out which cofactors your particular biochemistry needs, rather than guessing your way through generic advice that may or may not apply to your unique genetic blueprint. And your genetic data stays private throughout the process. It’s yours, and we treat it that way.
Ready to understand what your genes are telling you? Explore our tests and reports here.
Are you a practitioner looking to go deeper into the biochemistry? Companion practitioner post to come.
