What role does HLA-DQ2 play in gut health?

HLA-DQ2 is a gene variant complex strongly associated with celiac disease. Over 90% of celiac patients carry HLA-DQ2, but only about 3% of carriers develop the disease. The variant affects how the immune system presents gluten peptides, potentially triggering an autoimmune reaction. A positive DNA test alone is not diagnostic—it only indicates increased risk. For gut health, carriers with symptoms (bloating, diarrhea, fatigue) should pursue serological and biopsy confirmation. Asymptomatic carriers do not require dietary changes. The evidence for the celiac association is human-strong, but the predictive value of a DTC test is limited. Links to other gut conditions like IBS or non-celiac gluten sensitivity are less clear. Caution: a genetic test alone does not justify a gluten-free diet.