Abstract
Apolipoprotein H (APOH), also known as beta2-glycoprotein I, is a major autoantigen for the production of antiphospholipid antibodies (APA) in autoimmune diseases. APA is also recognized by a cryptic epitope generated following the interaction of APOH with anionic phospholipids (PL). The prevalence of APA in the general U.S. white population is about 10%, but it ranges from 30-70% in patients with lupus and antiphospholipid syndrome. Since the structural characterization of APOH from different mammalian species is important to identify the evolutionary conserved regions that may be critical for its function, we have previously determined the chimpanzee APOH gene structure and the prevalence of APA. There are only two amino acid differences between the chimpanzee and human wild type APOH proteins. Chimpanzees have an unusually high prevalence (64%) of APA. There is a common protein polymorphism in the human APOH gene, with the occurrence of four alleles APOH*1, APOH*2, APOH*3 and APOH*4, the latter being present only in blacks. Based on its differential reactivity with an APOH monoclonal antibody, the APOH*3 allele is further divided into APOH*3(W) (present only in whites) and APOH*3(B) (present only in blacks). In this study we...Continue Reading
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