Re: VRD can you change a person's dna?

It is possible to change human DNA in human cells growing in tissue 
culture using a retrovirus. These can be engineered to carry a new 
segment of DNA and insert it into the host DNA. This is now a 
standard technique for making transgenic animals - animals 
containing extra or manipulated DNA. It is also the basis for most 
thinking about gene therapy but at the moment such experiments 
have not been allowed in human beings because of  fear that 
inserting new DNA might lead to cancer.

DNA in our bodies gets changed in all sorts of ways just because we 
are alive. It gets damaged by radiation, by viruses and chemicals; 
things go wrong in cell division. The body has a very sophisticated 
system that checks for such damage and repairs it, if it can. If it can't, 
the cells with damaged DNA are killed or go onto to become 
cancerous.