No, mRNA vaccines do not affect your genetic structure. Here’s why:

1. mRNA Stays in the Cytoplasm – The vaccine delivers messenger RNA (mRNA) into your cells, which stays in the cytoplasm and is never integrated into your DNA, which is housed in the nucleus.

2. Temporary Effect – mRNA is naturally short-lived. After your cells use it to make the spike protein (which trains your immune system), enzymes quickly break it down and eliminate it.

3. Doesn’t Enter the Nucleus – Your DNA is inside the nucleus, and mRNA does not enter the nucleus or alter the genetic code.

4. Similar to Natural mRNA – Your body makes and destroys millions of mRNA molecules daily as part of normal cellular function. The vaccine’s mRNA works the same way.

Some confusion comes from DNA-based vaccines (like AstraZeneca or Johnson & Johnson), which use viral vectors that deliver DNA into cells. Even then, they don’t integrate into your genome—they just instruct the cell to make proteins temporarily.

The reputable scientists suggesting otherwise may be discussing hypothetical risks of DNA contamination or long-term unknowns, but there's no evidence of genome alteration in real-world data. If you want deeper technical studies on this, I can find them.