Strategy for Generating Giant Unilamellar Vesicles with Tunable Size Using the Modified cDICE Method.

Area of Science:

• Biophysics
• Synthetic Biology
• Materials Science

Background:

• Giant unilamellar vesicles (GUVs) are crucial for constructing artificial cells.
• Current GUV generation methods often yield broad, uncontrolled size distributions.
• This size variability hinders the development of reproducible artificial cell systems.

Purpose of the Study:

• To develop an optimization strategy for controlling GUV size distribution.
• To identify key experimental parameters that influence GUV size.
• To facilitate the creation of cell-sized compartments for synthetic biology.

Main Methods:

• Utilized a modified continuous droplet interface crossing encapsulation method for GUV generation.
• Systematically varied parameters including chamber rotation time, angular frequency, and inner solution density.
• Employed a physical model to explain observed size selection phenomena.

Main Results:

• Demonstrated effective refinement of GUV size distribution by adjusting key experimental parameters.
• Identified specific parameters as practical 'knobs' for precise GUV size control.
• Confirmed high encapsulation efficiency is maintained across a range of inner solution salinities, including physiological concentrations.

Conclusions:

• The study presents a practical method for selecting GUV sizes, addressing a critical limitation in artificial cell construction.
• Optimized GUV production facilitates the creation of cell-sized compartments with desired biological properties.
• This work advances synthetic biology by enabling more controlled and reproducible artificial cell development.