This is a real tough situation to be in. Revelation of this genetic disorder should have been made before the marriage was entered into. I don't know anything about this disorder, and I would agree with Christina that you should get some additional genetic counseling.

Personally, I would have a hard time conceiving a child with a high chance of inheriting a disorder that could very negatively impact his/her quality of life. My own preference would be to start exploring the option of adopting a child unrelated to either of you. This would put you both on an equal footing in terms of investment in the child. Adoption can be very hard to arrange.

Before doing any planning for a child, you need to find out if this marriage is really healthy enough to be the foundation of a family.

Taking a chance, hoping for the best, is certainly an option, but only if you both are okay with that. I'ld have a problem with it, myself.