CFH-CFHR1 hybrid genes in two cases of atypical hemolytic uremic syndrome

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<jats:title>Abstract</jats:title><jats:p>Atypical hemolytic uremic syndrome (aHUS) is a rare complement-mediated disease that manifests as the triad of thrombotic microangiopathy. We identified two aHUS patients with neither anti-complement factor H (CFH) antibodies nor causative variants of seven aHUS-related genes (<jats:italic>CFH</jats:italic>, <jats:italic>CFI</jats:italic>, <jats:italic>CFB</jats:italic>, <jats:italic>C3</jats:italic>, <jats:italic>MCP</jats:italic>, <jats:italic>THBD</jats:italic>, and <jats:italic>DGKE</jats:italic>); however, their plasma showed increased levels of hemolysis by hemolytic assay, which strongly suggests CFH-related abnormalities. Using a copy number variation (CNV) analysis of the <jats:italic>CFH/CFHR</jats:italic> gene cluster, we identified <jats:italic>CFH-CFHR1</jats:italic> hybrid genes in these patients. We verified the absence of aHUS-related abnormal CNVs of the <jats:italic>CFH</jats:italic> gene in control genomes of 2036 individuals in the general population, which suggests that pathogenicity is related to these hybrid genes. Our study emphasizes that, for patients suspected of having aHUS, it is important to perform an integrated analysis based on a clinical examination, functional analysis, and detailed genetic investigation.</jats:p>

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