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2015 ; 34
(10
): 1319-35
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Snai1 regulates cell lineage allocation and stem cell maintenance in the mouse
intestinal epithelium
#MMPMID25759216
Horvay K
; Jardé T
; Casagranda F
; Perreau VM
; Haigh K
; Nefzger CM
; Akhtar R
; Gridley T
; Berx G
; Haigh JJ
; Barker N
; Polo JM
; Hime GR
; Abud HE
EMBO J
2015[May]; 34
(10
): 1319-35
PMID25759216
show ga
Snail family members regulate epithelial-to-mesenchymal transition (EMT) during
invasion of intestinal tumours, but their role in normal intestinal homeostasis
is unknown. Studies in breast and skin epithelia indicate that Snail proteins
promote an undifferentiated state. Here, we demonstrate that conditional knockout
of Snai1 in the intestinal epithelium results in apoptotic loss of crypt base
columnar stem cells and bias towards differentiation of secretory lineages. In
vitro organoid cultures derived from Snai1 conditional knockout mice also undergo
apoptosis when Snai1 is deleted. Conversely, ectopic expression of Snai1 in the
intestinal epithelium in vivo results in the expansion of the crypt base columnar
cell pool and a decrease in secretory enteroendocrine and Paneth cells. Following
conditional deletion of Snai1, the intestinal epithelium fails to produce a
proliferative response following radiation-induced damage indicating a
fundamental requirement for Snai1 in epithelial regeneration. These results
demonstrate that Snai1 is required for regulation of lineage choice, maintenance
of CBC stem cells and regeneration of the intestinal epithelium following damage.