Abstract
The congenital form of thrombotic thrombocytopenic purpura (TTP) is caused by genetic mutations in ADAMTS13. Some, but not all, congenital TTP patients manifest renal insufficiency in addition to microangiopathic hemolysis and thrombocytopenia. We included 32 congenital TTP patients in the present study, which was designed to assess whether congenital TTP patients with renal insufficiency have predisposing mutations in complement regulatory genes, as found in many patients with atypical hemolytic uremic syndrome (aHUS). In 13 patients with severe renal insufficiency, six candidate complement or complement regulatory genes were sequenced and 11 missense mutations were identified. One of these missense mutations, C3:p.K155Q mutation, is a rare mutation located in the macroglobulin-like 2 domain of C3, where other mutations predisposing for aHUS cluster. Several of the common missense mutations identified in our study have been reported to increase disease-risk for aHUS, but were not more common in patients with as compared to those without renal insufficiency. Taken together, our results show that the majority of the congenital TTP patients with renal insufficiency studied do not carry rare genetic mutations in complement or complement regulatory genes.
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Acknowledgments
This work was supported in part by grants-in-aid from the Ministry of Health, Labor, and Welfare of Japan, the Japan Society for the Promotion of Science, the Takeda Science Foundation and the Swiss National Science Foundation (Grant Nr 32003B-124892 and 310030-160269). The hereditary TTP registry (www.ttpregistry.net, ClinicalTrials.gov identifier NCT01257269) is supported by an investigator initiated research grant from Baxter Bioscience. The research activity of Dr. Fan was supported by a Scholarship from the Takeda Science Foundation. Dr. Eura was a recipient of a scholarship from the Association for Preventive Medicine of Japan.
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Dr. Lämmle is a member of the Data Safety Monitoring committee of the BAX 930 Study testing rADAMTS13 in congenital TTP patients. Dr. Fujimura is a recipient of the research fund from Alexion Pharmaceuticals. Other authors have no conflict of interests.
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Fan, X., Kremer Hovinga, J.A., Shirotani-Ikejima, H. et al. Genetic variations in complement factors in patients with congenital thrombotic thrombocytopenic purpura with renal insufficiency. Int J Hematol 103, 283–291 (2016). https://doi.org/10.1007/s12185-015-1933-7
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DOI: https://doi.org/10.1007/s12185-015-1933-7