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Precardiac mesoderm is specified during gastrulation in quail
P B Antin1, R G Taylor, T Yatskievych
1Department of Animal Sciences, University of Arizona, Tucson 85721.
Summary
Quail embryo mesoderm can develop into heart muscle cells independently. However, endoderm enhances differentiation rate and heart tube formation, while ectoderm does not support development.
Area of Science:
- Developmental biology
- Cell biology
- Embryology
Background:
- Understanding heart muscle cell development is crucial for developmental biology.
- The roles of surrounding tissues in early heart formation are not fully elucidated.
Purpose of the Study:
- To investigate the role of precardiac mesoderm, endoderm, and ectoderm in quail heart muscle cell development.
- To determine the earliest stage at which mesoderm can differentiate into cardiac myocytes.
Main Methods:
- Explantation of quail embryo mesoderm (stages 4+-6) with or without adjacent endoderm or ectoderm.
- Culture of explants in defined media for 12-72 hours.
- Assay of differentiated cardiac myocytes using morphological and immunocytochemical criteria.
Main Results:
- Quail precardiac mesoderm differentiates into beating cardiac myocytes by stage 4+ in a defined medium.
- Endoderm enhances the rate of myocyte differentiation and shortens the delay to beating.
- Endoderm is essential for heart tube morphogenesis, while ectoderm does not support development.
Conclusions:
- Early heart muscle cell development involves a specification step before or during gastrulation.
- Endoderm plays a critical role in enhancing differentiation and morphogenesis of the heart tube.