Distinct genetic profile with recurrent population-specific missense variants in Korean adult atypical hemolytic uremic syndrome.

Abstract:

INTRODUCTION:Atypical hemolytic uremic syndrome (aHUS) is a rare thrombotic microangiopathy (TMA), characterized by micro-angiopathic hemolytic anemia, thrombocytopenia, and renal failure. In more than half of cases, genetic defects leading to overactivation of the alternative complement system have been identified. In this study, we investigated genetic defects in Korean adult patients with aHUS. MATERIALS AND METHODS:Sixty-six Korean adult patients with aHUS were ascertained from the Korean TMA Registry. Genetic variants of 15 aHUS-related genes (eight core genes [CFH, CFB, CFI, CD46, C3, THBD, PLG, and DGKE] and seven candidate genes [CFP, C4BPA, and CHFR1-5]) were analyzed from exome sequencing data. Multiplex ligation-dependent probe amplification of CFH and related genes was performed to detect hybrid genes or large deletions. RESULTS:Thirty patients (45%) had at least one aHUS-related variant (s) in eight core genes (total 40 variant alleles). The most frequently affected gene was CFH (13/40, 32%), followed by THBD (8/40, 20%) and CD46 (7/40, 18%). The two most common variants were Asp486Tyr of THBD (N = 7) and Tyr1058His-Val1060Leu of CFH (N = 5, linked on the same allele), accounting for 30% (12/40). In seven candidate genes, 19 variants were detected. When combined, 40 patients (61%) had at least one variant in 15 core or candidate genes. No patients had anti-CFH Ab or hybrid gene/CFHR1 homozygous deletions. CONCLUSIONS:The genetic profile of Korean adult aHUS was unique with recurrent missense variants, demonstrating ethnicity- and age-dependent differences in the genetic background of aHUS.

journal_name

Thromb Res

journal_title

Thrombosis research

authors

Yun JW,Oh J,Lee KO,Lee SJ,Kim JO,Kim NK,Kim JS,Koh Y,Yoon SS,Yhim HY,Jo SK,Park Y,Lee JE,Park J,Lee JW,Kim SH,Kim HJ,Oh D,Korean TTP Registry investigators.,aHUS working group.

doi

10.1016/j.thromres.2020.06.016

subject

Has Abstract

pub_date

2020-10-01 00:00:00

pages

45-53

eissn

0049-3848

issn

1879-2472

pii

S0049-3848(20)30258-9

journal_volume

194

pub_type

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