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Título: | Gain-of-function mutations in complement factor B are associated with atypical hemolytic uremic syndrome |
Autor: | Goicoechea de Jorge, Elena CSIC ORCID; Harris, Claire L.; Esparza-Gordillo, Jorge CSIC; Carreras, Luis; Aller Arranz, Elena CSIC; Abarrategui-Garrido, Cynthia; López-Trascasa, Margarita; Sánchez-Corral, Pilar CSIC ORCID; Morgan, B. Paul; Rodríguez de Córdoba, Santiago | Palabras clave: | Haemolytic uremic syndrome Complement Renal disease |
Fecha de publicación: | 2-ene-2007 | Editor: | National Academy of Sciences (U.S.) | Citación: | Proceedings of the National Academy of Sciences, 104 (1) : 240-245 (2007) | Resumen: | Hemolytic uremic syndrome (HUS) is an important cause of acute renal failure in children. Mutations in one or more genes encoding complement-regulatory proteins have been reported in approximately one-third of nondiarrheal, atypical HUS (aHUS) patients, suggesting a defect in the protection of cell surfaces against complement activation in susceptible individuals. Here, we identified a subgroup of aHUS patients showing persistent activation of the complement alternative pathway and found within this subgroup two families with mutations in the gene encoding factor B (BF), a zymogen that carries the catalytic site of the complement alternative pathway convertase (C3bBb). Functional analyses demonstrated that F286L and K323E aHUS-associated BF mutations are gain-of-function mutations that result in enhanced formation of the C3bBb convertase or increased resistance to inactivation by complement regulators. These data expand our understanding of the genetic factors conferring predisposition to aHUS, demonstrate the critical role of the alternative complement pathway in the pathogenesis of aHUS, and provide support for the use of complement-inhibition therapies to prevent or reduce tissue damage caused by dysregulated complement activation | Descripción: | 31 p.-5 fig.-2 tab. | Versión del editor: | http://dx.doi.org/10.1073/pnas.0603420103 | URI: | http://hdl.handle.net/10261/67584 | DOI: | 10.1073/pnas.0603420103 | E-ISSN: | 1091-6490 |
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