LionsMane

I have been fascinated by a theory of mine. Is there a way to split the human genetic structure, then split and fuse another genetic strand to it in order to create an entirely new genetic sequence? I have been theorizing that if it can be done with, say, animal D.N.A, then one could in theory create a mutant genetic structure for the purpose of solving genetic defects without a human donor.This way there would be a virtually unlimited supply that could help thousand, if not more, who suffer from such defects.