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Blood, 15 December 2008, Vol. 112, No. 13, pp. 4948-4952. Prepublished online as a Blood First Edition Paper on September 16, 2008; DOI 10.1182/blood-2008-01-133702.
HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY Mutations in complement C3 predispose to development of atypical hemolytic uremic syndrome1 Service d'Immunologie Biologique, Hôpital Européen Georges Pompidou, Paris, and INSERM UMRS 872, Cordeliers Research Center, Paris, France; 2 Division of Rheumatology, Washington University School of Medicine, St Louis, MO; 3 Northern Molecular Genetics Service and Departments of 4 Renal Medicine and 5 Paediatric Nephrology, Newcastle upon Tyne Hospitals National Health Service Foundation Trust, Newcastle upon Tyne, United Kingdom; 6 Division of Nephrology, Children's Hospital of Philadelphia, PA; 7 Paediatric Nephrology, Maria Fareri Children's Hospital at Westchester Medical Center, Valhalla, NY; 8 Division of Clinical Nephrology, Department of Internal Medicine, Innsbruck University Hospital, Innsbruck, Austria; 9 Pediatric Nephrology, Children's Hospital of Michigan, Detroit; 10 Unité de Néphrologie Pédiatrique, Centre Hospitalier de Tours, Tours, France; 11 Starship Children's Hospital, Auckland, New Zealand; 12 Département de Médecine de l'Enfant et de l'Adolescent, Centre Hospitalier Universitaire Rennes, Hôpital Sud, Rennes, France; 13 Service de Néphrologie Transplantation Renale, Hôpital Clemenceau, Caen, France; 14 Service de Pédiatrie, Hôpital de Hautepierre, Strasbourg, France; 15 Service de Medecine Interne, Hôpital Robert Boulin, Libourne, France; 16 Service de Néphrologie Pédiatrique, Hôpital Robert-Debré, Paris, France; 17 Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Faculty of Science, Utrecht University, Utrecht, The Netherlands; and 18 Institute of Human Genetics, Newcastle University, Newcastle upon Tyne, United Kingdom
Atypical hemolytic uremic syndrome (aHUS) is a disease of complement dysregulation. In approximately 50% of patients, mutations have been described in the genes encoding the complement regulators factor H, MCP, and factor I or the activator factor B. We report here mutations in the central component of the complement cascade, C3, in association with aHUS. We describe 9 novel C3 mutations in 14 aHUS patients with a persistently low serum C3 level. We have demonstrated that 5 of these mutations are gain-of-function and 2 are inactivating. This establishes C3 as a susceptibility factor for aHUS.
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