Epiboly
Epiboly - Related Videos
08:07
Zebrafish Reproduction and Development
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2023
The zebrafish (Danio rerio) has become a popular model for studying genetics and developmental biology. The transparency of these animals at early developmental stages permits the direct visualization of tissue morphogenesis at the cellular level. Furthermore, zebrafish are amenable to genetic manipulation, allowing researchers to determine the effect of gene expression on the development of a vertebrate with a high degree of genetic similarity to humans. This video provides a brief overview of...
09:47
AFM and Microrheology in the Zebrafish Embryo Yolk Cell
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Cited by 3 •
2017
The lack of tools to measure material properties and tensional parameters in vivo prevents validating their roles during development. We employed atomic force microscopy (AFM) and nanoparticle-tracking to quantify mechanical features on the intact zebrafish embryo yolk cell during epiboly. These methods are reliable and widely applicable avoiding intrusive interventions.
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Actomyosin-generated forces help drive tissue movement across the yolk cell surface during epiboly. Actomyosin refers to the interaction of actin and myosin within the cytoskeleton, a cellular framework that can generate mechanical force. Examining this activity allows researchers to connect cytoskeletal mechanics with large-scale tissue spreading and determine how force production contributes to embryo shaping.
The enveloping layer contributes by extending over the yolk cell surface while embryonic tissues undergo coordinated rearrangements. Its behavior illustrates that epiboly depends on several tissues acting together rather than on passive spreading by a single cell sheet. Tracking this layer alongside deeper tissues helps reveal how tissue interactions organize movement during early embryonic development.
Coordinated cell rearrangements allow embryonic tissues to change position and organization as epiboly proceeds. These rearrangements are important because the movement must integrate thinning, spreading, and enclosure of deeper layers or yolk. In developmental biology, analyzing their timing and coordination provides a way to study how local cellular behaviors produce an organized body plan.
Live imaging follows epiboly as it unfolds in the embryo, rather than capturing only a fixed developmental endpoint. Researchers can observe the enveloping layer, tissue rearrangements, and movement across the yolk cell surface in real time. This approach links visible changes in tissue shape and position to the underlying cellular and cytoskeletal processes.
Genetic manipulation tests how particular developmental components affect epiboly and tissue coordination. By altering gene activity and examining resulting movement or organization, researchers can investigate connections between cellular mechanisms, tissue interactions, and developmental abnormalities. Used with live imaging, this strategy helps relate a molecular change to its effects on morphogenetic behavior.
Epiboly provides a developmental biology model for studying how embryos establish tissue organization and shape the body plan. Its analysis brings together cell movement, cytoskeletal mechanics, and interactions among embryonic tissues. Findings from this process can also inform investigations of developmental abnormalities by showing how disrupted coordination may affect large-scale embryonic organization.