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2015 ; 6
(ä): 7476
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Zic1 controls placode progenitor formation non-cell autonomously by regulating
retinoic acid production and transport
#MMPMID26101153
Jaurena MB
; Juraver-Geslin H
; Devotta A
; Saint-Jeannet JP
Nat Commun
2015[Jun]; 6
(ä): 7476
PMID26101153
show ga
All cranial placode progenitors arise from a common precursor field anterior to
the neural plate, the pre-placodal region (PPR). We showed that transcription
factor Zic1, expressed at the anterior neural plate, is necessary and sufficient
to promote placode fate. Here we reveal the non-cell autonomous activity of Zic1
and implicate retinoic acid (RA) signalling as a key player in cranial placode
progenitor specification. In a screen for genes activated by Zic1, we identify
several factors involved in RA metabolism and function. Among them we show that
retinaldehyde dehydrogenase 2 (RALDH2) and lipocalin-type prostaglandin D2
synthase (LPGDS), which, respectively, regulate the synthesis and transport of
RA, directly participate in the establishment of the PPR. We propose that RALDH2
and LPGDS induction by Zic1 at the anterior neural plate allows for the localized
production and transport of RA, which in turn activates a cranial placode
developmental programme in neighbouring cells.