Hi Morriss,
I lurk on these forums on occasion, but I created an account just so I can respond to your post and reassure you.
My 36 year old husband has CF with those same mutations, which are considered atypical CF. He was just diagnosed in 2007 after we were trying (and failing) to get pregnant. He had no other symptoms besides the infertility (which is common in almost all men with CF). After seeing a couple specialists, one suggested doing a sweat test (which was positive) and then a genetic test (which finalized the diagnosis). His lungs are perfect, he's very athletic, and he's had absolutely no symptoms CF other than the infertility. At this point, we do annual check ups with his doctor, but no treatment or meds.
Obviously, CF can really vary from individual to individual, but I wanted to let you know what his experience has been with this particular mutation. We live a very happy and fulfilled life. Personally, we have elected to not pursue fertility treatments (IVF with ICSI) because we don't want to risk having me pass on a rare mutation and having a child with a potentially more serious type of CF. I have a child from a previous relationship, and my husband has adopted him. As a mom myself, I know how much I'd worry about my son's health if he had CF. But I wanted to post and reassure you that the 5T mutation has resulted in my husband's life having been minimally impacted so far from CF. We don't know what the future holds, but we're optimistic.
Keelan