Not going to get into who should get the vaccine, pros/cons, etc but an mRNA vaccine does not alter your DNA or RNA in any way shape or form. Is it new technology? - Yes and No. Has it ever been successfully used in humans? No. An mRNA vaccine is a piece of synthetic virus RNA that communicates a message to your cells to produce neutralizing antibodies. It is simply a set of instructions that can be read and understood by your cells. Think of it like the print button on a computer except in this case antibodies are printed. When you print something on a computer there are no physical or material changes happening to the computer it is just using the CPU momentarily to execute pre-coded instructions. The only way there there could be DNA changes to humans is if you believe they (who ever they are) have somehow incorporated CRISPR tech into the vaccine.