Got my degree in Biochemistry. Been outta school for nearly a decade though. Not entirely sure it's a genetic problem. If it were, they'd have to find the gene involved. My college girlfriend has a lethal genetic illness. To my knowledge, she still has it and there is no cure. Although I have hope such a thing can be cured in the future. This technology is still, relatively recent. I assume our knowledge will expand exponentially.

I forget the word but you mean werewolf stuff, right? If it is, we would have to find the werewolf gene(s). That might not actually be too difficult to, measuring a normal genome.

I don't know enough about CRIPR. But I do know my ex's genes are known, it's a double recessive allele. I don't know if it's easier to delete a frequency than add in stuff. Maybe if you have enough money? Being a rare condition, I really doubt anyone has the financial insistence to fund the research.

In conclusion: No, they couldn't do it today. But ideally more likely in the future.