Originally Posted by newB

It's mRNA - it uses the protein building mechanism of translation to build fragments of the proteins in the spike. As foreign proteins, these are what the vaccine is priming the recipients immune system to recognize.

In no way does it alter your DNA or genes.

But you know what can? Viruses. When they inject their DNA into the host cell, they can change the sequence upstream of an oncogene, turning it into a start codon.

FYI, I have multiple degrees in the life sciences, including a minor in Genetics and a lot of post-grad Genetics courses.