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Dev Biol. 2018 Feb 1;434(1):121-132. doi: 10.1016/j.ydbio.2017.11.018. Epub 2017 Dec 5.

Timing is everything: Reiterative Wnt, BMP and RA signaling regulate developmental competence during endoderm organogenesis.

Author information

1
Center for Stem Cell&Organoid Medicine (CuSTOM), Perinatal Institute, Divisions of Developmental Biology the Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH 45229, USA.
2
Pulmonary Biology, Cincinnati Children's Hospital, and the Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH 45229, USA. Electronic address: jmshannon8@gmail.com.
3
Center for Stem Cell&Organoid Medicine (CuSTOM), Perinatal Institute, Divisions of Developmental Biology the Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH 45229, USA. Electronic address: Aaron.Zorn@cchmc.org.

Abstract

A small number of signaling pathways are used repeatedly during organogenesis, and they can have drastically different effects on the same population of cells depending on the embryonic stage. How cellular competence changes over developmental time is not well understood. Here we used Xenopus, mouse, and human pluripotent stem cells to investigate how the temporal sequence of Wnt, BMP, and retinoic acid (RA) signals regulates endoderm developmental competence and organ induction, focusing on respiratory fate. While Nkx2-1+ lung fate is not induced until late somitogenesis stages, here we show that lung competence is restricted by the gastrula stage as a result of Wnt and BMP-dependent anterior-posterior (A-P) patterning. These early Wnt and BMP signals make posterior endoderm refractory to subsequent RA/Wnt/BMP-dependent lung induction. We further mapped how RA modulates the response to Wnt and BMP in a temporal specific manner. In the gastrula RA promotes posterior identity, however in early somite stages of development RA regulates respiratory versus pharyngeal potential in anterior endoderm and midgut versus hindgut potential in posterior endoderm. Together our data suggest a dynamic and conserved response of vertebrate endoderm during organogenesis, wherein early Wnt/BMP/RA impacts how cells respond to later Wnt/BMP/RA signals, illustrating how reiterative combinatorial signaling can regulate both developmental competence and subsequent fate specification.

KEYWORDS:

Bmp; Endoderm; Foregut; Hindgut; Intestine; Lung; Midgut; Mouse; Nkx2-1; Patterning; Pharynx; Retinoic Acid; Wnt; Xenopus; hPSC

PMID:
29217200
PMCID:
PMC5785443
[Available on 2019-02-01]
DOI:
10.1016/j.ydbio.2017.11.018
[Indexed for MEDLINE]

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