Yes, I think it is quite possible. Genetic Engineering are becoming more advance nowadays, and inplanting strange genes or modified genes will be easy in a few years later. But I am not quite familiar with this X-men movie, and I have only saw X-men II, and I just felt it boring and did not wanted to see anymore,so I just "put it" aside. But I still know the setting of the movie.Example for the character Wolferine, we can change the gene of a human, causing the bones of the human to be sharp, and able to be used as a weapon in times of need.