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Extracellular matrix deposition controls early differentiation patterns in human cardiac gastruloids

Marchand, M. F.; Sahni, G.; Arora, A.; Sehrouchni, S.; Dilasser, F.; Monet, A.; Luciani, F.; Rajendiran, H.; Chabot, L.; Mohamad Raffi, S. B.; Grenci, G.; Sibarita, J.-B.; Galland, R.; Zhu, J.; Viasnoff, V.

2025-03-19 cell biology
10.1101/2025.03.18.643854 bioRxiv
Show abstract

Amongst the various factors that affect differentiation and tissue organization, the autonomous deposition of extracellular matrix (ECM) has hardly been considered in the context of gastruloids. Using biofunctionalized colloidal particles as artificial organizing centers (aOCs), we patterned differentiation loci within 3D embryonic bodies. Our findings reveal that the spatial distribution of the aOCs induces various pattern organizations, mediated by endogenous deposition of ECM. We investigated how the interplay between meso-endoderm cell epithelial-to-mesenchymal transition, migration into germ layers, and the prolonged maintenance of local stem-cell niches orchestrates gastruloid structure and composition. These factors collectively regulate the complexity of emergent cardiac structures observed at later time points. This work uncovers a critical feedback loop between cell differentiation rates and endogenous ECM deposition patterns, which governs the differentiation paths in scaffolded cardiac gastruloids.

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