Microscreening toxicity system based on living magnetic yeast and gradient chips.

Area of Science:

• Biotechnology
• Environmental Science
• Toxicology

Background:

• Increasing industrial chemical production necessitates efficient toxicological screening methods.
• Existing methods can be costly and time-consuming for evaluating complex chemical mixtures.
• Genetically modified reporter organisms offer potential for sensitive toxicity detection.

Purpose of the Study:

• To develop an easy and cost-effective method for screening the toxicological impact of chemical mixtures.
• To utilize genetically modified green fluorescent protein (GFP) reporter yeast within a microfluidic device for toxicity assessment.
• To demonstrate the efficacy of magnetic functionalization for enhanced yeast cell retention and manipulation in bioassays.

Main Methods:

• Genetically modified GFP reporter yeast were magnetically functionalized using PAH-stabilized magnetic nanoparticles.
• The functionalized yeast were housed within a microfluidic device.
• Gradient mixing was employed to expose yeast to a range of methyl methane sulfonate (MMS) concentrations.
• GFP fluorescence, indicative of genotoxicity, was measured.

Main Results:

• The magnetic yeast system successfully detected genotoxicity induced by methyl methane sulfonate (MMS).
• The microfluidic device facilitated simultaneous exposure to various toxin concentrations.
• Magnetically retained yeast cells allowed for convenient and rapid screening.
• The system demonstrated potential for automation and reuse.

Conclusions:

• Magnetically functionalized GFP reporter yeast in microfluidic devices provide a simple, rapid, and cost-effective bioassay for toxicity screening.
• This approach is adaptable for other fluorescent reporter yeast and has potential applications in toxicological and biomedical research.
• The developed microfluidic chip offers a low-cost, automatable platform for evaluating a wide range of chemicals and concentrations.