Genetic disorders in complement (regulating) genes in patients with atypical haemolytic uraemic syndrome (aHUS)

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
Dineke WestraLambert van den Heuvel

Abstract

Atypical HUS (aHUS) is thought to be caused by predisposing mutations in genes encoding complement (regulating) proteins, such as Factor H (CFH), Factor I (IF), membrane co-factor protein (MCP) and Factor B (FB), or by auto-antibodies against CFH (alphaFH) in combination with a homozygous polymorphic deletion of the genes encoding Complement Factor H-related 1 and 3 (DeltaCFHR1/3). The clinical impact of this knowledge is high, as it might be a prognostic factor for the outcome of renal transplantations and kidney donations. Mutational screening, by means of PCR and DNA sequencing, is performed in the above-mentioned genes in a group of 72 aHUS patients. Also, the presence of alphaFH and DeltaCFHR1/3 was tested in patients and controls. In 23 patients, a genetic aberration in at least one gene or the presence of alphaFH was found. A heterozygous mutation was observed in CFH in nine patients, in IF in seven patients and in MCP in three patients. No mutations were observed in FB. Seven patients presented alphaFH, of whom five also carried DeltaCFHR1/3. Three patients carried a combined mutation (two patients: IF and MCP; one patient: IF, alphaFH and DeltaCFHR1/3). A significant difference between patients and controls was detecte...Continue Reading

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