Cellular Defects Can Guide Tissue Growth Like Origami

Researchers have discovered that topological defects in cell alignment can act as instructions to shape larger tissue structures ^[1].

This finding suggests a new method for programmable tissue engineering. By leveraging naturally occurring cellular patterns, scientists may be able to direct the formation of complex biological architectures without external intervention.

The study, published in Science Magazine, focuses on cellular sheets characterized by nematic order ^[1]. In these systems, cells align in specific directions, but certain points of misalignment—known as topological defects—emerge naturally ^[1]. The researchers said that these defects are not merely errors in alignment but serve as cues that dictate how the tissue folds and curves ^[1].

This process is analogous to origami, where a flat sheet is folded into a three-dimensional shape based on a set of pre-defined creases ^[1]. In the biological context, the topological defects function as these creases, guiding the cellular sheet to organize into larger, more complex structures ^[1].

The ability to harness these defects allows for the creation of built-in instructions within the tissue itself ^[1]. Rather than relying on external mechanical forces to bend or shape a growth, the internal geometry of the cell alignment drives the process ^[1].

Scientists said they aim to use these programmable cues to direct the formation of specific tissue architectures ^[1]. This approach could potentially lead to more efficient ways of growing synthetic organs, or repairing damaged tissues, by utilizing the inherent physics of cellular organization ^[1].