Sculpting with stem cells: how models of embryo development take shape

Area of Science:

• Developmental biology
• Stem cell biology
• Biophysics

Background:

• Mammalian embryo development is complex, with geometrical, mechanical, and biochemical constraints influencing shape acquisition.
• Direct in vivo observation and manipulation of mammalian embryos are limited, hindering a comprehensive understanding of morphogenesis.
• Embryo-like structures (stembryos) derived from pluripotent stem cells offer an accessible model for studying early development.

Purpose of the Study:

• To investigate the minimal mechanical and biochemical inputs required for patterning and shaping the mammalian embryo.
• To understand the mechanochemical feedback loops governing embryo morphogenesis.
• To leverage stembryo variability for identifying constraints ensuring reproducible in vivo morphogenesis.

Main Methods:

• Developmental engineering of stembryos from pluripotent stem cells.
• Controlled modulation of the cellular environment to unlock distinct architectural levels.
• Precise measurements and manipulations of tissue biochemistry, mechanics, and geometry.
• Analysis of intrinsic phenotypic variability in stembryos.

Main Results:

• Identification of distinct levels of embryo-like architecture through environmental modulation.
• Determination of minimal mechanical and biochemical inputs essential for mammalian embryo patterning and shaping.
• Insights into mechanochemical feedback loops governing morphogenesis through multi-scale analysis.
• Characterization of stembryo variability for understanding reproducible development.

Conclusions:

• Stembryos provide a powerful platform for dissecting the fundamental principles of mammalian embryo morphogenesis.
• Understanding mechanochemical feedback is crucial for deciphering developmental patterning.
• Stembryo variability offers a unique window into the constraints that ensure developmental robustness.