Super cool research! However, it says that the genetic marker is only in 3.5% of patients, so it may be better to say that they found "a" cause rather than "the" cause. But that's still ok because that could eventually translate to cures or at least enhanced treatment for many thousands of people!

Donation link for anyone interested. This organization was a huge help for a family member some years ago - https://giving.crohnscolitisfoundation.org/page/AD-SEM-MATCH