It always amuses me whenever I see something about "finding the gene(s) responsible for balding". What does it even MEAN, "responsible for balding"? There are several specific genes that could be altered to stop balding. For example, you could knock-out the gene that encodes the 5a-reductase type 2 enzyme, which would definitely stop balding! But would you say that THAT particular gene is "responsible for balding"?
You could also alter or knock-out the gene that encodes the androgen receptor, which would also stop balding (and cause many other VERY bad side effects); would you say that THAT particular gene is "responsible for balding"?
You could also alter or knock-out any number of important genes having to do with the synthesis of testosterone, which would also certainly stop balding; would you say that THOSE particular genes are "responsible for balding"?
As for me, I tend to feel that whatever gene (or set of genes) causes scalp hair follicles to be suppressed by androgens in the first place could probably or possibly be called "responsible for balding", but I'm not even entirely sure about THAT! :$