JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Human leukocyte antigen A29 subtypes associated with birdshot retinochoroidopathy.

PURPOSE: To determine whether birdshot retinochoroidopathy is associated with subtypes of the human leukocyte antigen (HLA)-A29 other than HLA-A*2902.

DESIGN: Experimental study.

METHODS: High-resolution DNA typing of HLA-A29 subtypes was performed on blood from 20 subjects with birdshot retinochoroidopathy using polymerase chain reaction-based typing methods. Results were compared with published controls.

RESULTS: Four of 20 subjects (20%) had the HLA-A*2901 allele; two were homozygous for HLA-A*29, and both had the HLA-A*2901 and HLA-A*2902 alleles. Among 18 subjects with only one HLA-A*29 allele, the HLA-A*2902 allele was found in 16 (89%) and the HLA-A*2901 allele was found in two (11%). No subject was found to have HLA-A*2903, HLA-A*2904, HLA-A*2905, or HLA-A*2906.

CONCLUSIONS: Both HLA-A*2901 and HLA-A*2902 are associated with birdshot retinochoroidopathy. Our data do not support the previous suggestion that the HLA-A29.1 serotype may be protective against development of birdshot retinochoroidopathy. Additional studies will be required to determine whether the other, less common subtypes are associated with the disease. HLA-A29 subtype testing is not required for the clinical evaluation of HLA-A29-positive patients with birdshot retinochoroidopathy.

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