The mRNA vaccines don't affect the DNA: the mRNA never enters the nucleus of the cell where the DNA resides. To enter the nucleus, you'll need some enzymes, and then some other enzymes to manipulate the DNA. The mRNA vaccines don't contain any enzymes or sequences to create them. There are viruses that can do this, and there are vaccines that use these viruses to inject DNA into the nucleus so the DNA can produce RNA there. This still doesn't manipulates the cell DNA, but the direction is dangerous.  We have seen documents that show that the NIAID pays Chinese labs to do the last step, to develop viruses that manipulate the cell DNA. They say that they do it to cure hereditary diseases, but we know that they will not stop there.