Bioengineers Program Living Tissue to Self Assemble Into Predetermined Three Dimensional Shapes Using Chemical Micropatterns

IBEC researchers demonstrate how to program living tissues into 3D shapes by controlling cell orientation and forces via chemical micropatterns.

By: AXL Media

Published: Apr 17, 2026, 7:40 AM EDT

Source: Information for this report was sourced from EurekAlert!

Harnessing Natural Forces for Synthetic Design

A research collaboration led by the Institute for Bioengineering of Catalonia (IBEC) has achieved a breakthrough in synthetic biology by programming living tissues to adopt specific three dimensional geometries. While biological tissues naturally possess the ability to organize and change shape, precisely controlling these internal forces has historically remained a significant bioengineering challenge. The team’s new strategy involves directing how cells orient themselves within a tissue, allowing for the creation of synthetic materials that move and deform independently. This development positions living tissue as a programmable material, offering a new frontier for designing structures that can respond intelligently to their environment.

The Role of Nematic Order and Topological Defects

The core of the study, published in the journal Science, relies on a phenomenon known as nematic order, where elongated cells align in the same direction like textile fibers. Within these aligned domains, researchers look for "topological defects," which are specific points of local disorder where the alignment breaks down. In nature, these defects occur spontaneously and act as convergence points for mechanical forces. According to first author Pau Guillamat, the orientation of these cells controls the forces that ultimately determine the final three dimensional shape of the tissue. By mapping these orientations, the researchers can effectively decide where mechanical stress will accumulate.

Programming Orientation via Chemical Micropatterning

To achieve precise control over cell alignment, the scientists utilized chemical micropatterns to "draw" specific maps on flat surfaces. They used a protein that encourages cell adhesion to create thin lines, surrounding them with a polymer that cells avoid. This technique forced the cells to align strictly along the designated paths, imposing topological defects in exact, pre-planned locations. This level of precision is a major departure from natural tissue growth, as it allows engineers to dictate the mechanical "map" of the tissue before growth even begins. By controlling the layout, the team can pre-determine how the tissue will behave once it is released from its substrate.