Joint Study of the Associations of HLA-B and the Transmembrane Short Tandem Repeat Polymorphism of MICA Protein with Alopecia Areata Shows Independent Associations of Both with the Disease

The study investigated the associations of short tandem repeats (STRs) of the MICA protein and the HLA-B locus with alopecia areata (AA), a condition characterized by patchy hair loss due to immune system attacks on hair follicles. Previous research linked MICA polymorphisms to AA, but did not consider STRs. This study found associations between AA and both MICA*009 and HLA-B14, as well as between HLA-B and MICA alleles, which had been individually connected to AA but not studied together. The findings suggested that examining HLA-B and MICA together is crucial to avoid confounding results when they are studied separately.