Microfluidic Evolution-On-A-Chip Reveals New Mutations that Cause Antibiotic Resistance

Area of Science:

• Microbiology
• Evolutionary Biology
• Biotechnology

Background:

• Microfluidic devices can replicate natural microenvironments, inducing microbial heterogeneity.
• Spatially organized stress gradients in microfluidic systems promote complex phenotypic adaptations.
• Conventional methods struggle to achieve the controlled conditions necessary for studying microbial evolution.

Purpose of the Study:

• To develop and utilize a microfluidic chip for microbial adaptive laboratory evolution (ALE).
• To investigate the impact of precisely controlled chemical stress gradients on microbial adaptation.
• To discover novel mutations conferring antibiotic resistance in microbial populations.

Main Methods:

• Development of a microfluidic chip with consecutive microcompartments for precise chemical gradients.
• Application of microbial adaptive laboratory evolution (ALE) under defined stress profiles.
• Exposure of microbial cells, specifically Escherichia coli, to stressors like antibiotics.

Main Results:

• The microfluidic chip successfully induced microbial adaptation and phenotypic complexity.
• Chip-based ALE identified previously unknown mutations in Escherichia coli conferring nalidixic acid resistance.
• The device demonstrated control over stress adaptation, including resistance and persistence.

Conclusions:

• Microfluidic ALE is a powerful tool for studying microbial evolution and adaptation.
• This technology enables the discovery of novel resistance mechanisms.
• The device provides insights into parameters influencing antibiotic resistance development.