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. 1987 Jul;84(14):4979–4983. doi: 10.1073/pnas.84.14.4979

Analysis of anticentromere autoantibodies using cloned autoantigen CENP-B.

W C Earnshaw, P S Machlin, B J Bordwell, N F Rothfield, D W Cleveland
PMCID: PMC305230  PMID: 2440036

Abstract

A cDNA clone encoding CENP-B, the 80-kDa human centromere autoantigen, was used to construct a panel of hybrid proteins containing four different regions of CENP-B. These have allowed us to identify three independent epitopes on CENP-B that are targets of autoantibodies. Two of these are recognized concurrently in greater than or equal to 90% of patient sera containing anticentromere autoantibodies (ACA), conclusively demonstrating that this autoimmune response is polyclonal. When present and previous data are combined, ACA are shown to recognize at least five independent epitopes on CENP-B. A radioimmunoassay based on cloned CENP-B has demonstrated that sera from greater than or equal to 96% of patients with ACA recognize the cloned antigen, thus defining a region of the protein that is recognized by virtually all patients with ACA. These findings have significant implications for models that seek to explain the origin of ACA and for the future detection of this group of autoantibodies in the clinical setting.

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