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2017 ; 127
(3
): 912-928
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Mutations in sphingosine-1-phosphate lyase cause nephrosis with ichthyosis and
adrenal insufficiency
#MMPMID28165339
Lovric S
; Goncalves S
; Gee HY
; Oskouian B
; Srinivas H
; Choi WI
; Shril S
; Ashraf S
; Tan W
; Rao J
; Airik M
; Schapiro D
; Braun DA
; Sadowski CE
; Widmeier E
; Jobst-Schwan T
; Schmidt JM
; Girik V
; Capitani G
; Suh JH
; Lachaussée N
; Arrondel C
; Patat J
; Gribouval O
; Furlano M
; Boyer O
; Schmitt A
; Vuiblet V
; Hashmi S
; Wilcken R
; Bernier FP
; Innes AM
; Parboosingh JS
; Lamont RE
; Midgley JP
; Wright N
; Majewski J
; Zenker M
; Schaefer F
; Kuss N
; Greil J
; Giese T
; Schwarz K
; Catheline V
; Schanze D
; Franke I
; Sznajer Y
; Truant AS
; Adams B
; Désir J
; Biemann R
; Pei Y
; Ars E
; Lloberas N
; Madrid A
; Dharnidharka VR
; Connolly AM
; Willing MC
; Cooper MA
; Lifton RP
; Simons M
; Riezman H
; Antignac C
; Saba JD
; Hildebrandt F
J Clin Invest
2017[Mar]; 127
(3
): 912-928
PMID28165339
show ga
Steroid-resistant nephrotic syndrome (SRNS) causes 15% of chronic kidney disease
cases. A mutation in 1 of over 40 monogenic genes can be detected in
approximately 30% of individuals with SRNS whose symptoms manifest before 25
years of age. However, in many patients, the genetic etiology remains unknown.
Here, we have performed whole exome sequencing to identify recessive causes of
SRNS. In 7 families with SRNS and facultative ichthyosis, adrenal insufficiency,
immunodeficiency, and neurological defects, we identified 9 different recessive
mutations in SGPL1, which encodes sphingosine-1-phosphate (S1P) lyase. All
mutations resulted in reduced or absent SGPL1 protein and/or enzyme activity.
Overexpression of cDNA representing SGPL1 mutations resulted in subcellular
mislocalization of SGPL1. Furthermore, expression of WT human SGPL1 rescued
growth of SGPL1-deficient dpl1? yeast strains, whereas expression of
disease-associated variants did not. Immunofluorescence revealed SGPL1 expression
in mouse podocytes and mesangial cells. Knockdown of Sgpl1 in rat mesangial cells
inhibited cell migration, which was partially rescued by VPC23109, an S1P
receptor antagonist. In Drosophila, Sply mutants, which lack SGPL1, displayed a
phenotype reminiscent of nephrotic syndrome in nephrocytes. WT Sply, but not the
disease-associated variants, rescued this phenotype. Together, these results
indicate that SGPL1 mutations cause a syndromic form of SRNS.