TGM2 and celiac disease: Meanwhile, in Asian countries, it has been reported that celiac disease is extremely uncommon in Asian populations; however, with the aid of serological biomarkers such as tissue transglutaminase IgA, deaminated gliadin IgA, deaminated gliadin IgG, and endomysial IgA Ab, it has been shown that celiac disease is both a common and an often underdiagnosed disorder in Asia.3, 5, 6, 7