"I" have questioned if my father's genes were damaged because of WWII and the fact that my father was one of the first to enter one of those atom bomb sites. (He's now deceased and died of lung cancer -- with asbestos -- lots of it found in the lungs. Smoking was the determining cause listed on the death certificate.)
There was someone who won a Nobel Prize somewhere around 1954 (for their proving that a "fruit fly's" genes carried over a nuclear mutation)?
Personally, I think that they can't determine the cause of M.S. because there are probably many causes (with stress bringing on the immune's system erroneaus attack in the brain).
Hind-sight has small hints of the disease in the body from age 4. I was diagnosed at age 52. My opinion is that menogapause and stress played a large part in the severe attacks.
I do have two brothers. The older does one not have any symptoms, but the younger one has symptoms only noticable by me (because I've been there.)
We had "clonus" (an involuntary shaking of the leg) when we were babies. Furthermore, my son had this. It was supposively an "immature" nervous system at birth. (However, I now question the "immaturity".)