Is APOA2 useful for allergy?

The provided context does not contain any information linking APOA2 to allergy. APOA2 encodes apolipoprotein A-II, involved in HDL metabolism. Variants have been studied in relation to lipid disorders and obesity, but not directly with allergic conditions. A potential indirect role via inflammatory pathways is hypothetical but unsupported by the given sources. Thus, the evidence for APOA2's usefulness in allergy is unclear. For allergy genetics, established markers include HLA, IL-13, and FLG. Testing APOA2 alone would not be clinically informative for allergy.