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Brachyury establishes the embryonic mesodermal progenitor niche.

Benjamin L Martin¹, David Kimelman

¹Department of Biochemistry, University of Washington, Seattle, Washington 98195, USA.

Genes & Development

|December 17, 2010

Summary

Early vertebrate embryo development relies on a Brachyury/Wnt loop. This study shows retinoic acid disrupts this loop by repressing no tail (ntl) expression, highlighting how mesodermal progenitors create their own signaling niche.

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Area of Science:

Developmental biology
Molecular signaling in embryogenesis
Vertebrate embryonic development

Background:

Early vertebrate embryonic development is orchestrated by complex signaling pathways.
A key pathway involves a Brachyury/Wnt autoregulatory loop in posterior mesodermal progenitors.
Disruptions to this loop can lead to severe developmental defects.

Purpose of the Study:

To investigate the role of retinoic acid (RA) in disrupting the Brachyury/Wnt autoregulatory loop during early zebrafish embryogenesis.
To elucidate the mechanism by which the no tail (ntl) gene, a zebrafish Brachyury ortholog, interacts with RA signaling.
To understand how mesodermal progenitors establish their own signaling niche.

Main Methods:

Utilized exogenous retinoic acid (RA) administration in zebrafish embryos.
Analyzed the expression patterns of the no tail (ntl) gene and cyp26a1.
Investigated the autoregulatory feedback mechanisms involving Brachyury and Wnt signaling.

Main Results:

Exogenous retinoic acid (RA) dramatically truncated zebrafish embryos.
RA repressed the expression of no tail (ntl), leading to a failure in sustaining the Brachyury/Wnt autoregulatory loop.
Ntl protein was found to directly activate cyp26a1 expression, protecting the autoregulatory loop from endogenous RA.

Conclusions:

Embryonic mesodermal progenitors actively establish their own signaling niche.
Brachyury is essential for creating a localized domain of high Wnt and low RA signaling.
This self-established niche, rather than one provided by support cells, is critical for proper embryonic development.