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Scalable and automated CRISPR-based strain engineering using droplet microfluidics.

Kosuke Iwai1,2, Maren Wehrs3,4, Megan Garber3,4

  • 1Technology Division, DOE Joint BioEnergy Institute, Emeryville, CA 94608 USA.

Microsystems & Nanoengineering
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This study introduces a microfluidic system for CRISPR gene editing and screening. The chip performs 100 parallel genetic modifications, enabling efficient bioengineering and strain optimization.

Keywords:
EngineeringMicrofluidics

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Synthetic Biology

Background:

  • CRISPR-based gene editing is crucial for biological research and bioengineering.
  • High-throughput screening methods are needed to optimize genetic pathways and engineer strains.
  • Existing methods can be limited in scalability and efficiency for complex genetic modifications.

Purpose of the Study:

  • To develop a droplet-based microfluidic system for parallel CRISPR-based gene editing and high-throughput screening.
  • To create a scalable platform for generating engineered strains for combinatorial optimization.
  • To demonstrate the system's utility in practical gene editing applications.

Main Methods:

  • A microfluidic device with a 10x10 element array was designed.
  • Each element utilizes electrowetting for reagent mixing and electroporation for genetic transformation.
  • The system enables up to 100 parallel genetic modification reactions.

Main Results:

  • The system successfully performed CRISPR-based gene editing in E. coli.
  • Demonstrated disruption of the galactokinase (galK) gene.
  • Showcased targeted engineering of glutamine synthetase (glnA) and blue-pigment synthetase (bpsA) genes to enhance indigoidine production.

Conclusions:

  • The droplet-based microfluidic system offers a scalable platform for high-throughput CRISPR gene editing.
  • This technology facilitates the generation of engineered strains for pathway optimization and bioengineering.
  • The demonstrated applications highlight the system's potential for advancing synthetic biology research.