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Cell-intrinsic compliance mechanism enables release of tensile stress to prevent tissue rupture

Chun Wai Kwan, Shunta Sakaguchi, Michiko Takeda, Takefumi Kondo, Yu-Chiun Wang

Posted on: 4 March 2026

Preprint posted on 2 February 2026

The soft and flowing will prevail: fly extraembryonic tissue actively soften to keep the embryo from tearing itself apart.

Selected by Ruoheng Li

Categories: cell biology, developmental biology

Introduction

Most of the time, we think of morphogenesis part by part: the neural plate folds, the heart loops, the appendages bud and elongate. However, the growing embryo is a whole, so if one tissue undergoes a drastic deformation, tissues next to it will potentially feel the push or pull coming across the boundary. In such cases, the force needs to be managed so that it does not cause unwanted deformation—kinks, bends, ruptures, etc.

This preprint explored the topic of inter-tissue mechanical interplay in the Drosophila extraembryonic tissue, the amnioserosa (AS). In gastrulation‑stage fly embryos, two large‑scale morphogenetic processes are taking place: mesoderm internalization (via the ventral furrow) and germband extension. Both processes generate pulling forces in the dorsal‑ventral direction and put the AS under tensile stress. Here, the authors shed light on cellular mechanisms that allow the AS to dissipate tension and prevent rupture.

 

Key Findings

  1. Characterization of AS morphogenesis

Using time‑lapse imaging, the authors showed that AS cells are initially columnar with isotropic, hexagonal apices; soon after the onset of ventral furrow formation, the cells begin to elongate; eventually they become highly elongated and aligned along the embryo circumference on the apical side, and they flatten in the apical‑basal direction (i.e., becoming squamous).

Fig. 1 AS squamous morphogenesis during gastrulation. Figure adapted from the preprint where it is available under a CC-BY-NC 4.0 International license.

 

  1. AS morphogenesis requires both intrinsic processes and external tensile stresses

Authors perturbed AS fate specification by abolishing the AS master regulator zerknüllt (via zen RNAi/zen mutant, collectively as zen–), or interfering with its upstream signals, Dorsal (via cactus RNAi) or Dpp (via dpp RNAi). Loss of any one reduced AS cell elongation at a similar extent. However, cell alignment remained.

Authors also perturbed tissue dynamics outside the AS by disrupting ventral furrow formation (snail RNAi) or germband extension (bcd nos tsl triple mutant, abbreviated as bnt). These manipulations also reduced AS elongation. Moreover, when germband extension was fully abolished, AS cell alignment was lost.

Fig. 2 Perturbing germband extension reduced AS cell elongation and abolished cell alignment along embryo circumference. Figure adapted from the preprint where it is available under a CC-BY-NC 4.0 International license.

  1. AS releases tensile stresses to prevent tissue rupture

When AS elongation was intrinsically blocked (zen−/cactus RNAi/dpp RNAi, as above), the tissue formed tears at the dorsal midline, sometimes eventually resulting in large ruptures. Importantly, further blocking either ventral furrow formation or germband extension in zen− embryos suppressed the ruptures. This suggests that the AS normally dissipates tension generated during gastrulation movements.

Fig. 3 Perturbing AS fate specification resulted in tissue rupture. Figure adapted from the preprint where it is available under a CC-BY-NC 4.0 International license.

  1. Mechanical compliance of the AS cells is linked to lowered junctional myosin as Shroom is downregulated

zen− embryos showed lower E-Cadherin and higher junctional myosin intensities.

In embryos defective in germ band extension (bnt mutant), increasing myosin contractility with the drug calyculin A completely abolished AS cell elongation, resembling the effect of zen RNAi. This suggests that Zen may act by lowering myosin activity.

The AS tissue shows downregulated expression of shroom (shrm), encoding the scaffolding protein Shrm that recruits Rho kinase to activate myosin. The authors therefore explored the role of Shrm in the AS:

  • Knocking down shrm in zen− embryos lowered junctional myosin and partially rescued tissue ruptures.
  • Conversely, ectopically expressing shrm in the AS using a new optogenetic construct was sufficient to produce tissue ruptures.

Thus, the authors concluded that in AS cells, Zen represses shrm expression, causing the cells to have lower junctional myosin activity and allowing them to elongate under tensile stress, which releases tension and ensures tissue integrity.

Fig. 4 Ectopically expressing shrm in AS is sufficient to cause ruptures, but not when germband extension is abolished. Figure adapted from the preprint where it is available under a CC-BY-NC 4.0 International license.

 

What I like about this preprint

I’ve always been interested in the topic of inter-tissue mechanical interactions during development—thinking from an evolutionary perspective, morphologies of body parts are selected for their own sake, but how do embryos make sure everything fits together? The mechanism described in this preprint suggests that not actively contributing to a morphogenetic process does not mean a tissue is doing nothing; rather, it might still need to regulate its mechanical properties to accommodate changes happening nearby. It would be exciting to see whether similar mechanisms also apply to other processes that involve drastic tissue deformation, as well as their implications in evolutionary history—if setting up a morphogenesis event requires such systemic regulation, how did it arise through evolution?

 

Questions for authors

  1. Can the tensile stress from gastrulation fully account for AS deformation, or could it be a mechanical signal that triggers intrinsic reorganization within AS?
  2. As mentioned in the preprint, epithelial tissues may have multiple ways to accommodate tensile stress. In the case of the AS, does the squamous morphogenesis and the highly elongated spindle shape have other biological roles, other than efficiently dissipating stress?

 

 

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Author's response

Yu-Chiun Wang shared

1. Can the tensile stress from gastrulation fully account for AS deformation, or could it be a mechanical signal that triggers intrinsic reorganization within AS?
The answer to these questions is we don’t really know. In fact how the AS cells undergo such extreme deformation on such a short timescale remains poorly understood. With the single cell RNA-seq dataset from our collaborator Takefumi Kondo, we are now better positioned to sieve through candidate downstream targets of Zen to ask whether there might be other cell-intrinsic mechanisms that are involved in AS deformation. We do have tentative hints that there likely are other cell-intrinsic mechanisms. Could any of these intrinsic mechanisms be mechanical-sensitive and responsive to external tensile stress? That is entirely possible and will be truly exciting if that turns out to be the case.
2. As mentioned in the preprint, epithelial tissues may have multiple ways to accommodate tensile stress. In the case of the AS, does the squamous morphogenesis and the highly elongated spindle shape have other biological roles, other than efficiently dissipating stress?
This is such an excellent question, one that we have been asking ourselves constantly, as we wrapped up work for the current preprint. In some ways, this question is directly linked to the previous one, where we believe the additional intrinsic mechanisms, or more precisely, mechanical properties, involved in AS squamous morphogenesis will likely tell us about the roles of these cells beyond dissipating stresses. One thing that are looking at — and will be thrilled if anyone reading this is interested in joining force with us to crack the code — is the propensity to increase cell-cell contact surface. By being highly elongated with very high contact surface area, it is already suggestive for what the roles of this morphogenetic process might be when in fact the tissue is not destined to contribute to the end product of embryonic development.

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