Microfluidic system with integrated microinjector for automated Drosophila embryo injection

Area of Science:

• Biotechnology
• Developmental Biology
• Genomics

Background:

• Drosophila melanogaster is a key model organism in biological research.
• Advances in genomics and over a century of research provide a foundation for molecular investigations.
• Automated, high-throughput manipulation of Drosophila embryos is needed for efficient research.

Purpose of the Study:

• To develop a microfluidic system for automated reagent injection into Drosophila embryos.
• To enable high-throughput screening and creation of transgenic Drosophila lines.
• To create a versatile platform for automated manipulation of multicellular organisms.

Main Methods:

• A Pyrex-silicon-Pyrex sandwich structure with an integrated silicon nitride injector was designed.
• The system automates embryo retrieval, separation using sheath flow, alignment via geometric constraints, and injection.
• Flow drag forces position embryos for injection, with automated detection triggering reagent delivery and embryo ejection.

Main Results:

• The developed microfluidic system successfully automates the process of retrieving, aligning, and injecting reagents into Drosophila embryos.
• The system demonstrates efficient embryo handling, including separation of clustered embryos and precise injection.
• The technology supports automated screens and the generation of transgenic Drosophila lines.

Conclusions:

• The microfluidic system provides a technological solution for automated manipulation of Drosophila embryos.
• This platform can significantly advance high-throughput screening and genetic engineering in Drosophila.
• The system's design is adaptable for manipulating other species' oocytes, embryos, larvae, or adults.