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High plating density improves Big Blue system efficiency without loss of sensitivity.
P W Heinmöller1, K A Hill, S S Sommer
1Department of Molecular Genetics, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA.
Mutation Research
|September 28, 2000
Summary
Increasing plaque-forming units (pfus) per plate in the Big Blue system, a mouse model for genetic mutation, enhances efficiency. High plating density reduces effort by 50% and cost by 17% without affecting mutation frequency or pattern.
Area of Science:
- Genetics
- Molecular Biology
- Biotechnology
Background:
- The Big Blue system is a widely used in vivo genetic mutation detection system.
- Optimizing the Big Blue system's efficiency is crucial for cost-effective genetic toxicology studies.
- High throughput screening is essential for analyzing large numbers of mutations.
Purpose of the Study:
- To enhance the efficiency and reduce the cost of the Big Blue system.
- To evaluate the impact of increased plating density on mutation detection.
- To assess the effect of plating density on mutant frequency and pattern analysis.
Main Methods:
- The Big Blue system was utilized with increased plating densities (30,000-45,000 plaque-forming units/plate).
- E. coli lawn density was increased and individual plaque size decreased to minimize overlap.
- Liver samples from mice with varying mutation frequencies were analyzed.
Main Results:
- Increased plating density did not affect mutant/mutation frequency or pattern.
- Plaque size and plating density had no impact on mutant plaque color intensity.
- Effort for plating and screening was reduced twofold, and total system cost decreased by 17%.
Conclusions:
- High plating density significantly improves the efficiency and cost-effectiveness of the Big Blue system.
- The optimized system maintains sensitivity for mutation detection.
- The Big Blue system with high plating density is a cost-effective and validated tool for genetic mutation studies.