Microbial sensor for preliminary screening of mutagens utilizing a phage induction test.

Area of Science:

• Microbiology
• Biotechnology
• Environmental Science

Background:

• Mutagen screening is crucial for public health and environmental safety.
• Existing methods for mutagen detection can be complex and time-consuming.
• There is a need for rapid and reliable screening systems for mutagens.

Purpose of the Study:

• To develop a novel microbial sensor system for the preliminary screening of mutagens.
• To utilize a phage induction test with Escherichia coli for mutagen detection.
• To establish a method for estimating a substrate's mutagenicity based on cellular respiration.

Main Methods:

• Developed a microbial sensor system using Escherichia coli lysogenic (GY5027) and nonlysogenic (GY5026) strains.
• Quantified living cells by measuring respiration of immobilized cells on an oxygen electrode.
• Administered known mutagens (AF-2, MNNG) and observed effects on phage induction and respiration.

Main Results:

• Mutagenic substances induced phage production in the lysogenic strain, decreasing its respiration.
• The nonlysogenic strain's respiration remained unaffected by mutagens.
• The rate of respiration change correlated with mutagen concentration, differentiating mutagens from antibiotics/bactericides.

Conclusions:

• The developed microbial sensor system effectively detects mutagens via phage induction.
• This system provides a reliable method for estimating mutagenicity.
• The sensor's distinct responses differentiate mutagens from other chemical agents.