Mosaic · Genomics 101
DNA, SNPs, and epigenetics, without the textbook.
A plain-language primer for the curious. What your genome is, what a variant actually means, and why your genes set the range, but never the verdict.
Part 1: DNA
Your DNA is the blueprint.
Every cell in your body carries a copy of your DNA — about six billion letters of it, packed into 23 pairs of chromosomes. The letters spell out the instructions for building every enzyme, hormone receptor, neurotransmitter, immune signal, and structural protein that runs your biology.
Roughly 99.9% of your DNA matches everyone else’s. The 0.1% that doesn’t — three to four million letters — is what makes your biology yours: how fast you metabolize caffeine, how readily you clear histamine, how well you activate vitamin D, and a hundred places like that.
Reading the whole genome means reading all six billion letters. Reading a consumer SNP chip means reading a few hundred thousand of them and inferring the rest. That’s the difference between knowing and guessing.
Part 2: SNPs
SNPs are the variations that matter most.
SNP stands for Single Nucleotide Polymorphism. It’s pronounced “snip.” A SNP is a single position in your DNA where the letter you carry can differ from the letter someone else carries. Most genetic variation in a population shows up as SNPs.
Most SNPs do nothing — they sit in non-coding stretches the body never notices. A smaller fraction (the ones Mosaic focuses on) sit inside genes that code for an enzyme, a receptor, or a transcription factor, where a different letter can change how that enzyme works or how that receptor binds. That’s where your biology and someone else’s start to diverge.
When you read “the C677T variant of MTHFR” on a report, what you’re reading is a specific SNP: position 677 in the MTHFR gene, where some people carry C and some carry T. The T version codes for a less efficient version of the enzyme. That’s the kind of finding the 108 insights in your Mosaic report are built on.
Part 3: Epigenetics
Epigenetics is the volume knobs.
Your DNA sequence is fixed at conception. The letters don’t change. What does change is how loudly each gene gets read — how much of its protein actually gets produced in your cells at any given moment. The system of switches that controls that is called epigenetics, literally “on top of genetics.”
The switches respond to inputs you can control. Sleep changes gene expression. So does diet. So does exercise. So does stress, and the supplements you take, and the toxins you’re exposed to. The same DNA can produce very different biology in two people — or in the same person at two different stages of life — depending on which switches are currently on.
This is why a genetic report doesn’t read as fate. The variants tell you where the wiring is strong and where it’s constrained. The lifestyle modulators — cofactors, dietary triggers, training inputs, sleep timing — are how you decide where on the wiring you actually land. Every Mosaic insight names both.
Part 4: Multiple pathways
Why one variant isn’t the story.
Most biology that matters doesn’t run through a single gene. It runs through a pathway — a chain of enzymes, receptors, and cofactors, each with its own variants, each capable of shifting the outcome.
Vitamin D is a clean example. Getting it from sunlight to a form your cells can use takes three steps, across three genes: GC carries it through the blood, CYP2R1 activates it in the liver, VDR receives it at the cell. A variant in any one of them can slow the whole sequence — and reading only one would miss most of the picture.
The same is true for thyroid conversion (DIO1 and DIO2, plus the selenium cofactor), for estrogen clearance (Phase I and Phase II detox, plus receptor sensitivity), and for most of the findings worth acting on. When a Mosaic insight spans a pathway, it names every gene in it — because the step that actually moves the pathway is often the one you weren’t looking at.
The Mosaic operating principle
Your genes are the instrument. Lifestyle plays the song.
A finding in your report isn’t a prediction. It’s a setting. Your DAO variant doesn’t guarantee you’ll struggle with histamine — it tells you the clearance pathway runs a little slower, which makes some foods, some times of day, and some cofactor levels more important than they’d be for someone with a different variant.
The report is the wiring diagram. Epigenetics — how lifestyle flips the switches — is how you live in the body the wiring describes. The Mosaic Biodata Institute trains practitioners on exactly that translation: read the wiring, then build the practical protocol from it.
Probability. Not destiny. That’s the whole frame.
Now see what your DNA actually says.
108 insights across nine areas of your health. Color-coded, written for daily use, paired with the lifestyle modulators that move each pathway.