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2015 ; 96
(1
): 153-61
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Defects of CRB2 cause steroid-resistant nephrotic syndrome
#MMPMID25557779
Ebarasi L
; Ashraf S
; Bierzynska A
; Gee HY
; McCarthy HJ
; Lovric S
; Sadowski CE
; Pabst W
; Vega-Warner V
; Fang H
; Koziell A
; Simpson MA
; Dursun I
; Serdaroglu E
; Levy S
; Saleem MA
; Hildebrandt F
; Majumdar A
Am J Hum Genet
2015[Jan]; 96
(1
): 153-61
PMID25557779
show ga
Nephrotic syndrome (NS), the association of gross proteinuria, hypoalbuminaemia,
edema, and hyperlipidemia, can be clinically divided into steroid-sensitive
(SSNS) and steroid-resistant (SRNS) forms. SRNS regularly progresses to end-stage
renal failure. By homozygosity mapping and whole exome sequencing, we here
identify recessive mutations in Crumbs homolog 2 (CRB2) in four different
families affected by SRNS. Previously, we established a requirement for zebrafish
crb2b, a conserved regulator of epithelial polarity, in podocyte morphogenesis.
By characterization of a loss-of-function mutation in zebrafish crb2b, we now
show that zebrafish crb2b is required for podocyte foot process arborization,
slit diaphragm formation, and proper nephrin trafficking. Furthermore, by
complementation experiments in zebrafish, we demonstrate that CRB2 mutations
result in loss of function and therefore constitute causative mutations leading
to NS in humans. These results implicate defects in podocyte apico-basal polarity
in the pathogenesis of NS.