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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Am+Soc+Nephrol
2014 ; 25
(11
): 2584-95
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Sall1 maintains nephron progenitors and nascent nephrons by acting as both an
activator and a repressor
#MMPMID24744442
Kanda S
; Tanigawa S
; Ohmori T
; Taguchi A
; Kudo K
; Suzuki Y
; Sato Y
; Hino S
; Sander M
; Perantoni AO
; Sugano S
; Nakao M
; Nishinakamura R
J Am Soc Nephrol
2014[Nov]; 25
(11
): 2584-95
PMID24744442
show ga
The balanced self-renewal and differentiation of nephron progenitors are critical
for kidney development and controlled, in part, by the transcription factor Six2,
which antagonizes canonical Wnt signaling-mediated differentiation. A nuclear
factor, Sall1, is expressed in Six2-positive progenitors as well as
differentiating nascent nephrons, and it is essential for kidney formation.
However, the molecular functions and targets of Sall1, especially the functions
and targets in the nephron progenitors, remain unknown. Here, we report that
Sall1 deletion in Six2-positive nephron progenitors results in severe progenitor
depletion and apoptosis of the differentiating nephrons in mice. Analysis of mice
with an inducible Sall1 deletion revealed that Sall1 activates genes expressed in
progenitors while repressing genes expressed in differentiating nephrons. Sall1
and Six2 co-occupied many progenitor-related gene loci, and Sall1 bound to Six2
biochemically. In contrast, Sall1 did not bind to the Wnt4 locus suppressed by
Six2. Sall1-mediated repression was also independent of its binding to DNA. Thus,
Sall1 maintains nephron progenitors and their derivatives by a unique mechanism,
which partly overlaps but is distinct from that of Six2: Sall1 activates
progenitor-related genes in Six2-positive nephron progenitors and represses gene
expression in Six2-negative differentiating nascent nephrons.