Programmable morphogenesis: integrating biophysical and genetic engineering tools to direct tissue formation.

Abstract

Engineering approaches, including microfluidics, bioprinting, and genetic engineering, have transformed the capacity to model tissue morphogenesis<i>in vitro</i>. These platforms enable precise programming of biophysical and chemical cues that influence collective cell behaviors, creating experimental systems for studying how cells integrate microenvironmental signals to drive developmental processes. This review examines engineered approaches for creating morphogenetic models and evaluates their complementary capabilities, constraints, and potential for integration. Microfluidic devices are discussed for generating stable biochemical gradients and controlling fluid dynamics in two-dimensional and three-dimensional (3D) configurations. Extrusion and digital light-processing bioprinting enable the construction of spatially organized 3D cellular assemblies with platform-specific trade-offs between resolution, viability, and scalability. Optogenetic systems provide spatiotemporal control over gene expression for patterning morphogenic events. The review systematically addresses technical and biological constraints, including gradient instability, resolution-viability trade-offs, phototoxicity, and the persistent gap between morphological patterning and functional maturation. We conclude with guidance for platform selection and a discussion of how integrating these complementary technologies may accelerate mechanistic understanding of morphogenesis.