What role does TCF7L2 play in Allergie?

TCF7L2 is a transcription factor in the Wnt pathway, strongly linked to type 2 diabetes risk. Its role in allergies is not established. Some research suggests possible involvement in immune regulation, such as T-cell differentiation or inflammatory signaling, but the evidence is weak and inconsistent. Most associations come from candidate gene studies with small samples or GWAS that do not reach significance for allergy phenotypes. In DTC tests, TCF7L2 is typically reported only for diabetes. Any claim about allergies would be speculative. The evidence grade is 'unclear' or 'mechanistic'. Consumers should not rely on this gene for allergy predictions.