Coordinated spatiotemporal reorganization of interstitial fluid is required for axial mesendoderm migration in zebrafish gastrulation

Huljev K. Coordinated spatiotemporal reorganization of interstitial fluid is required for axial mesendoderm migration in zebrafish gastrulation. IST Austria.

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Thesis | Unpublished | English
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Series Title
IST Austria Thesis
Abstract
Accumulation of interstitial fluid (IF) between embryonic cells is a common phenomenon in vertebrate embryogenesis. Unlike other model systems, where these accumulations coalesce into a large central cavity – the blastocoel, in zebrafish, IF is more uniformly distributed between the deep cells (DC) before the onset of gastrulation. This is likely due to the presence of a large extraembryonic structure – the yolk cell (YC) at the position where the blastocoel typically forms in other model organisms. IF has long been speculated to play a role in tissue morphogenesis during embryogenesis, but direct evidence supporting such function is still sparse. Here we show that the relocalization of IF to the interface between the YC and DC/epiblast is critical for axial mesendoderm (ME) cell protrusion formation and migration along this interface, a key process in embryonic axis formation. We further demonstrate that axial ME cell migration and IF relocalization engage in a positive feedback loop, where axial ME migration triggers IF accumulation ahead of the advancing axial ME tissue by mechanically compressing the overlying epiblast cell layer. Upon compression, locally induced flow relocalizes the IF through the porous epiblast tissue resulting in an IF accumulation ahead of the leading axial ME. This IF accumulation, in turn, promotes cell protrusion formation and migration of the leading axial ME cells, thereby facilitating axial ME extension. Our findings reveal a central role of dynamic IF relocalization in orchestrating germ layer morphogenesis during gastrulation.
Publishing Year
Date Published
2020-05-18
Page
101
IST-REx-ID

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Huljev K. Coordinated spatiotemporal reorganization of interstitial fluid is required for axial mesendoderm migration in zebrafish gastrulation. doi:10.15479/at:ista:9397
Huljev, K. (n.d.). Coordinated spatiotemporal reorganization of interstitial fluid is required for axial mesendoderm migration in zebrafish gastrulation. IST Austria. https://doi.org/10.15479/at:ista:9397
Huljev, Karla. “Coordinated Spatiotemporal Reorganization of Interstitial Fluid Is Required for Axial Mesendoderm Migration in Zebrafish Gastrulation.” IST Austria, n.d. https://doi.org/10.15479/at:ista:9397.
K. Huljev, “Coordinated spatiotemporal reorganization of interstitial fluid is required for axial mesendoderm migration in zebrafish gastrulation,” IST Austria.
Huljev K. Coordinated spatiotemporal reorganization of interstitial fluid is required for axial mesendoderm migration in zebrafish gastrulation. IST Austria.
Huljev, Karla. Coordinated Spatiotemporal Reorganization of Interstitial Fluid Is Required for Axial Mesendoderm Migration in Zebrafish Gastrulation. IST Austria, doi:10.15479/at:ista:9397.
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2021-05-18
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2022-05-20
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