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Light microscope observations on actin distribution during morphogenetic movements in the chick embryo
Abstract:
The cellular distribution of actin during two morphogenetic processes in the chick embryo has been observed, using a high-resolution fluorescent technique, with heavy meromyosin as a probe. These cytoskeletal elements have been implicated in all cell and tissue movements in the embryo. It is now commonly accepted that microfilaments are necessary to provide the motive force for morphogenesis. Two morphogenetic movements in the early embryo have been studied at the light microscope level. During somitogenesis, the mesenchymal segmental plate becomes transformed into a meristic series of transient epithelial vesicles. Again, actin distribution is diffuse and random before the morphogenetic event. During epithelialization, actin becomes prominent in the apical regions of the epithelial cells. Cells in the somitic epithelial vesicles, the core cells, appear to be passive participants in this process, and consequently show no distinct cellular localization of actin.
Insights
Actin
Area of Science:
- Developmental Biology
- Cell Biology
Background:
- Actin microfilaments are crucial for cell and tissue movements during embryonic development.
- Their role in providing motive force for morphogenesis is widely accepted.
Purpose of the Study:
- To investigate the cellular distribution of actin during two key morphogenetic processes in the chick embryo.
- To understand the role of actin in somitogenesis and epithelialization.
Main Methods:
- Utilized high-resolution fluorescent microscopy.
- Employed heavy meromyosin as a probe to visualize actin distribution.
- Observed cellular actin patterns during somitogenesis and epithelialization.
Main Results:
- Actin distribution was diffuse and random before somitogenesis.
- During epithelialization, actin became prominent in the apical regions of epithelial cells.
- Core cells within somitic epithelial vesicles showed no distinct actin localization.
Conclusions:
- Actin localization changes dynamically during embryonic morphogenesis.
- Apical actin accumulation is associated with epithelialization.
- Passive cells in developmental processes may not exhibit significant actin redistribution.