PUBLICATION
Restraint of Fgf8 signaling by retinoic acid signaling is required for proper heart and forelimb formation
- Authors
- Sorrell, M.R., and Waxman, J.S.
- ID
- ZDB-PUB-110803-40
- Date
- 2011
- Source
- Developmental Biology 358(1): 44-55 (Journal)
- Registered Authors
- Waxman, Joshua
- Keywords
- zebrafish, fgf signalling, retinoic acid, heart, forelimb
- MeSH Terms
-
- Animals
- Animals, Genetically Modified
- Fibroblast Growth Factors/metabolism*
- Forelimb/embryology*
- Gastrulation/physiology
- Genotype
- Heart/embryology*
- In Situ Hybridization
- Signal Transduction/physiology*
- Tretinoin/metabolism*
- Zebrafish/embryology*
- Zebrafish Proteins/metabolism*
- p-Aminoazobenzene/analogs & derivatives
- PubMed
- 21803036 Full text @ Dev. Biol.
Citation
Sorrell, M.R., and Waxman, J.S. (2011) Restraint of Fgf8 signaling by retinoic acid signaling is required for proper heart and forelimb formation. Developmental Biology. 358(1):44-55.
Abstract
Cardiomelic or heart-hand syndromes include congenital defects affecting both the forelimb and heart, suggesting a hypothesis where similar signals may coordinate their development. In support of this hypothesis, we have recently defined a mechanism by which retinoic acid (RA) signaling acts on the forelimb progenitors to indirectly restrict cardiac cell number. However, we still do not have a complete understanding of the mechanisms downstream of RA signaling that allow for the coordinated development of these structures. Here, we test the hypothesis that appropriate Fgf signaling in the cardiac progenitor field downstream of RA signaling is required for the coordinated development of the heart and forelimb. Consistent with this hypothesis, we find that increasing Fgf signaling can autonomously increase cardiac cell number and non-autonomously inhibit forelimb formation over the same time period that embryos are sensitive to loss of RA signaling. Furthermore, we find that Fgf8a, which is expressed in the cardiac progenitors, is expanded into the posterior in RA signaling-deficient zebrafish embryos. Reducing Fgf8a function in RA signaling-deficient embryos is able to rescue both heart and forelimb development. Together, these results are the first to directly support the hypothesis that RA signaling is required shortly after gastrulation in the forelimb field to temper Fgf8a signaling in the cardiac field, thus coordinating the development of the heart and forelimb.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping