Volume 57, Issue 3 pp. 431-438
Original Article

Atypical hemolytic uremic syndrome: Korean pediatric series

Jiwon M. Lee

Jiwon M. Lee

Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Korea

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Young Seo Park

Young Seo Park

Department of Pediatrics, Asan Medical Center, University of Ulsan, Seoul, Korea

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Joo Hoon Lee

Joo Hoon Lee

Department of Pediatrics, Asan Medical Center, University of Ulsan, Seoul, Korea

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Se Jin Park

Se Jin Park

Department of Pediatrics, Ajou University School of Medicine, Suwon, Korea

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Jae Il Shin

Jae Il Shin

Department of Pediatrics, Severance Children's Hospital, Yonsei University, Seoul, Korea

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Yong-Hoon Park

Yong-Hoon Park

Department of Pediatrics, Yeungnam University College of Medicine, Daegu, Korea

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Kee Hwan Yoo

Kee Hwan Yoo

Department of Pediatrics, Korea University Guro Hospital, Seoul, Korea

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Min Hyun Cho

Min Hyun Cho

Department of Pediatrics, Kyungpook National University Hospital, Daegu, Korea

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Su-Young Kim

Su-Young Kim

Department of Pediatrics, Pusan National University Children's Hospital, Yangsan, Korea

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Seong Heon Kim

Seong Heon Kim

Department of Pediatrics, Pusan National University Children's Hospital, Yangsan, Korea

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Mee Kyung Namgoong

Mee Kyung Namgoong

Department of Pediatrics, Wonju College of Medicine, Yonsei University, Wonju, Korea

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Seung Joo Lee

Seung Joo Lee

Department of Pediatrics, Ehwa University Mokdong Hospital, Seoul, Korea

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Jun Ho Lee

Jun Ho Lee

Department of Pediatrics, Bundang CHA Hospital, Seongnam, Korea

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Hee Yeon Cho

Hee Yeon Cho

Department of Pediatrics, Samsung Medical Center, Seoul, Korea

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Kyoung Hee Han

Kyoung Hee Han

Department of Pediatrics, Jeju University Hospital, Jeju, Korea

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Hee Gyung Kang

Hee Gyung Kang

Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Korea

Research Coordination Center for Rare Diseases, Seoul National University Hospital, Seoul, Korea

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Il Soo Ha

Il Soo Ha

Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Korea

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Jun-Seok Bae

Jun-Seok Bae

Samsung Genome Institute, Samsung Medical Center, Seoul, Korea

Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea

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Nayoung K. D. Kim

Nayoung K. D. Kim

Samsung Genome Institute, Samsung Medical Center, Seoul, Korea

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Woong-Yang Park

Woong-Yang Park

Samsung Genome Institute, Samsung Medical Center, Seoul, Korea

Sungkyunkwan University School of Medicine, Seoul, Korea

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Hae Il Cheong

Corresponding Author

Hae Il Cheong

Department of Pediatrics, Seoul National University Children's Hospital, Seoul, Korea

Research Coordination Center for Rare Diseases, Seoul National University Hospital, Seoul, Korea

Kidney Research Institute, Medical Research Center, Seoul National University College of Medicine, Seoul, Korea

Correspondence: Hae Il Cheong, MD PhD, Department of Pediatrics, Seoul National University Children's Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 110-744, Korea. Email [email protected]Search for more papers by this author
First published: 02 December 2014
Citations: 45

Abstract

Background

Atypical hemolytic uremic syndrome (aHUS) is a rare disease with a genetic predisposition. Few studies have evaluated the disease in the Asian population. We studied a Korean pediatric cohort to delineate the clinical characteristics and genotypes.

Methods

A multicenter cohort of 51 Korean children with aHUS was screened for mutations using targeted exome sequencing covering 46 complement related genes. Anti-complement-factor-H autoantibody (anti-CFH) titers were measured. Multiplex ligation-dependent probe amplification assay was performed to detect deletions in the complement factor-H related protein genes (CFHR) in the patients as well as in 100 healthy Korean controls. We grouped the patients according to etiology and compared the clinical features using Mann–Whitney U-test and chi-squared test.

Results

Fifteen patients (group A, 29.7%) had anti-CFH, and mutations were detected in 11 (group B, 21.6%), including one with combined mutations. The remaining 25 (group C, 49.0%) were negative for both. The prevalence of anti-CFH was higher than the worldwide level. Group A had a higher onset age than group B, although the difference was not significant. Group B had the worst renal outcome. Gene frequencies of homozygous CFHR1 deletion were 73.3%, 2.7% and 1% in group A, group B + C and the control, respectively.

Conclusions

The incidence of anti-CFH in the present Korean aHUS cohort was high. Clinical outcomes largely conformed to the previous reports. Although the sample size was limited, this cohort provides a reassessment of clinicogenetic features of aHUS in Korean children.

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