Volume 20, Issue 26 2306974
Research Article

Adaptive Laboratory Evolution of Probiotics toward Oxidative Stress Using a Microfluidic-Based Platform

Ann V. Nguyen

Ann V. Nguyen

Department of Food Science, College of Agricultural and Life Sciences, Cornell University, Stocking Hall, Ithaca, NY, 14853 USA

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Mohammad Yaghoobi

Mohammad Yaghoobi

Department of Food Science, College of Agricultural and Life Sciences, Cornell University, Stocking Hall, Ithaca, NY, 14853 USA

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Shiying Zhang

Shiying Zhang

Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, 602 Tower Rd., Ithaca, NY, 14853 USA

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Peilong Li

Peilong Li

Department of Food Science, College of Agricultural and Life Sciences, Cornell University, Stocking Hall, Ithaca, NY, 14853 USA

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Qike Li

Qike Li

Department of Food Science, College of Agricultural and Life Sciences, Cornell University, Stocking Hall, Ithaca, NY, 14853 USA

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Belgin Dogan

Belgin Dogan

Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, 602 Tower Rd., Ithaca, NY, 14853 USA

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Gianna P. Ahnrud

Gianna P. Ahnrud

DEVCOM Soldier Center, Soldier Sustainment Directorate, Combat Feeding Division, Food Protection & Innovative Packaging Team, Natick, MA, 01760 USA

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Genevieve Flock

Genevieve Flock

DEVCOM Soldier Center, Soldier Sustainment Directorate, Combat Feeding Division, Food Protection & Innovative Packaging Team, Natick, MA, 01760 USA

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Patrick Marek

Patrick Marek

DEVCOM Soldier Center, Soldier Sustainment Directorate, Combat Feeding Division, Food Protection & Innovative Packaging Team, Natick, MA, 01760 USA

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Kenneth W. Simpson

Kenneth W. Simpson

Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, 602 Tower Rd., Ithaca, NY, 14853 USA

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Alireza Abbaspourrad

Corresponding Author

Alireza Abbaspourrad

Department of Food Science, College of Agricultural and Life Sciences, Cornell University, Stocking Hall, Ithaca, NY, 14853 USA

E-mail: [email protected]

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First published: 21 January 2024
Citations: 12

Abstract

Adaptive laboratory evolution (ALE) can be used to make bacteria less susceptible to oxidative stress. An alternative to large batch scale ALE cultures is to use microfluidic platforms, which are often more economical and more efficient. Microfluidic ALE platforms have shown promise, but many have suffered from subpar cell passaging mechanisms and poor spatial definition. A new approach is presented using a microfluidic Evolution on a Chip (EVoc) design which progressively drives microbial cells from areas of lower H2O2 concentration to areas of higher concentration. Prolonged exposure, up to 72 h, revealed the survival of adaptive strains of Lacticaseibacillus rhamnosus GG, a beneficial probiotic often included in food products. After performing ALE on this microfluidic platform, the bacteria persisted under high H2O2 concentrations in repeated trials. After two progressive exposures, the ability of L. rhamnosus to grow in the presence of H2O2 increased from 1 mm H2O2 after a lag time of 31 h to 1 mm after 21 h, 2 mm after 28 h, and 3 mm after 42 h. The adaptive strains have different morphology, and gene expression compared to wild type, and genome sequencing revealed a potentially meaningful single nucleotide mutation in the protein omega-amidase.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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