What role does VKORC1 play in allergy?

The provided context does not contain any information about VKORC1 and allergy. VKORC1 is primarily known for its role in vitamin K metabolism and warfarin sensitivity. A potential indirect link to allergy could exist via vitamin K's influence on immune regulation, but this is speculative and not supported by robust human studies. Based on the general principles seen in the context (e.g., FTO, TAS2R38, VDR), single gene variants typically have small effects and are not diagnostic. For VKORC1 and allergy, there is no strong, replicated evidence. A blood test for vitamin K status would be more informative than a DNA test alone. Without direct evidence, any claimed role remains hypothetical. Evidence: mechanistic/unclear.