Multiplexing antibiotic screening assay in droplet microfluidics.

Area of Science:

• Microbiology
• Biotechnology
• Natural Products Chemistry

Background:

• Environmental samples harbor diverse microbial communities with potential for novel compound discovery.
• Traditional screening methods face challenges due to inefficient cultivation and lack of suitable platforms.
• Developing advanced screening platforms is crucial for unlocking the potential of microbial natural products.

Purpose of the Study:

• To develop and optimize a droplet-based microfluidic platform for high-throughput antibiotic screening.
• To enable multiplexed screening of complex microbial communities for bioactive compounds.
• To overcome limitations of current cultivation and screening techniques for natural product discovery.

Main Methods:

• A droplet-based microfluidic platform was engineered for cultivating bacteria in picoliter droplets.
• Multiplexed phenotypic screening was performed using a mixture of Gram-positive and Gram-negative whole-cell reporter strains.
• Antibiotic activity was assessed by monitoring the independent survival signals of reporter species within droplets.

Main Results:

• The platform successfully detected, selected, and recovered a model Streptomyces strain from a synthetic mixture.
• Proof-of-concept experiments validated the platform's ability to identify compounds based on specific inhibition profiles.
• The platform was successfully applied to screen environmental microbial communities from soil samples, demonstrating its practical utility.

Conclusions:

• The developed droplet-based platform offers an efficient and multiplexed approach for antibiotic screening from environmental samples.
• This microfluidic strategy enhances the discovery of novel bioactive compounds by enabling simultaneous screening for various inhibition profiles.
• The platform represents a significant advancement in natural product discovery from complex microbial communities.