A person’s risk of multiple sclerosis seems to come from their mother, new data shows. Multiple sclerosis is 20 to 50 times more common in people whose parents have the complex and poorly understood disease. But it’s not a simple matter of a single gene being passed on from generation to generation. Researchers don’t know whether multiple sclerosis comes from a person’s genes, from a person’s early environment, or from a complex interplay between the two.
