The current treatment is strict dietary exclusion of all protein from wheat, barley, rye and other related grains. It’s conceivable that wheat could be modified to produce proteins that are not immunogenic to celiac sufferers.
I'm not sure genetic mapping is really the core of the issue anyway. What we need is the equivalent of a reverse vaccination, since celiac is essentially an immunity to wheat. Such a concept might do for chronic disease what vaccination did for acute.
As far as future treatments, this clinical review https://www.gponline.com/coeliac-disease-clinical-review/gi-... concludes that
“Future potential treatments for patients with RCD include the development of genetically detoxified grains, oral and intranasal 'coeliac vaccines' to induce tolerance, inhibitors of TTG, and detoxification of immunogenic gliadin peptides via oral peptidase supplement therapy.”