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Clin Exp Nephrol. 2009 Oct;13(5):526-30. doi: 10.1007/s10157-009-0205-3. Epub 2009 Jul 1.

Hemolytic uremic syndrome due to homozygous factor H deficiency.

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  • 1Division of Pediatric Nephrology, Department of Pediatrics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India.


The majority of complement factor H mutations associated with atypical hemolytic uremic syndrome (HUS) are heterozygous. Homozygous mutations causing atypical hemolytic uremic syndrome are rare. We report a 7-month-old boy with HUS, severe hypocomplementemia (low C3 and normal C4 levels), and extremely low circulating levels of factor H. Genetic analysis showed homozygous 4 bp deletion in the gene encoding factor H in the patient, with his parents being carriers. The patient showed progression to end-stage renal disease and is presently on chronic ambulatory peritoneal dialysis.

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