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J Neuroimmunol. 2011 Jul;236(1-2):93-8. doi: 10.1016/j.jneuroim.2011.05.001. Epub 2011 May 31.

Orthogonal array formation by human aquaporin-4: examination of neuromyelitis optica-associated aquaporin-4 polymorphisms.

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  • 1Department of Medicine, University of California, San Francisco, CA 94143, USA.

Abstract

Pathogenic autoantibodies target aquaporin-4 (AQP4) water channels in individuals with neuromyelitis optica (NMO). Recently, allelic mutations were reported at residue 19 of AQP4 in three cases of NMO, and it was suggested that polymorphisms may influence disease by altering AQP4 supramolecular assembly into orthogonal arrays of particles (OAPs). We analyzed the determinants of OAP formation by human AQP4 to investigate the possible role of polymorphisms in NMO pathogenesis. NMO-associated mutations R19I and R19T in AQP4 did not affect OAP assembly, palmitoylation-dependent regulation of assembly, or NMO autoantibody binding. Residue-19 polymorphisms in AQP4 are thus unlikely to be disease relevant.

Copyright © 2011 Elsevier B.V. All rights reserved.

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