|ZFIN ID: ZDB-PUB-101222-36|
Brachyury establishes the embryonic mesodermal progenitor niche
Martin, B.L., and Kimelman, D.
|Source:||Genes & Development 24(24): 2778-2783 (Journal)|
|Registered Authors:||Kimelman, David, Martin, Benjamin|
|Keywords:||Brachyury, no tail, Wnt, retinoic acid, mesoderm, niche|
|PubMed:||21159819 Full text @ Genes & Dev.|
Martin, B.L., and Kimelman, D. (2010) Brachyury establishes the embryonic mesodermal progenitor niche. Genes & Development. 24(24):2778-2783.
ABSTRACTFormation of the early vertebrate embryo depends on a Brachyury/Wnt autoregulatory loop within the posterior mesodermal progenitors. We show that exogenous retinoic acid (RA), which dramatically truncates the embryo, represses expression of the zebrafish brachyury ortholog no tail (ntl), causing a failure to sustain the loop. We found that Ntl functions normally to protect the autoregulatory loop from endogenous RA by directly activating cyp26a1 expression. Thus, the embryonic mesodermal progenitors uniquely establish their own niche-with Brachyury being essential for creating a domain of high Wnt and low RA signaling-rather than having a niche created by separate support cells.