Digital microfluidic processing of mammalian embryos for vitrification

Area of Science:

• Reproductive biology
• Biotechnology
• Microfluidics

Background:

• Cryopreservation is vital for biological and clinical applications, requiring precise sample handling.
• Current methods for mammalian embryo vitrification can be labor-intensive and prone to error.
• Microfluidic devices offer potential for miniaturized and automated biological sample processing.

Purpose of the Study:

• To develop and validate a digital microfluidic device for automated sample preparation in mammalian embryo vitrification.
• To demonstrate the use of micro-droplets as micro-vessels for single embryo transport during vitrification.
• To compare the advantages of this automated microfluidic approach against manual and channel-based methods.

Main Methods:

• Design and implementation of a digital microfluidic platform for precise liquid handling.
• Utilizing individual micro-droplets to encapsulate and transport single mouse embryos.
• Automated sequential exposure of embryos to cryoprotective agents (CPAs) within micro-droplets.
• Development of protocols for loading and retrieving embryos from the microfluidic device.

Main Results:

• Successful automation of the complete vitrification procedure for individual mouse embryos.
• Demonstration of controlled cryoprotectant concentration gradient generation within micro-droplets.
• Achieved high efficiency in loading and retrieval of embryos from the microfluidic system.
• Showcased advantages over manual methods, including reduced handling and improved consistency.

Conclusions:

• Digital microfluidics provides an effective platform for automated, high-throughput mammalian embryo vitrification.
• The micro-droplet approach offers enhanced control over cryoprotectant exposure and embryo handling.
• This technology holds promise for improving the success rates and accessibility of assisted reproductive technologies.