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Interlaboratory Reproducibility in Growth and Reporter Expression in the Cyanobacterium Synechocystis sp. PCC 6803
Maurice Mager1, Hugo Pineda Hernandez2, Fabian Brandenburg3
1Institute for Synthetic Microbiology, Heinrich Heine University Duesseldorf, Universitaetsstrasse 1, 40225 Duesseldorf, Germany.
ACS Synthetic Biology
|May 29, 2023
Summary
Reproducibility of synthetic biology tools in cyanobacteria is limited. An interlaboratory study found significant variations in promoter activity measurements, highlighting issues with standard protocols and reporting practices.
Area of Science:
- Synthetic Biology
- Microbiology
- Cyanobacteria Research
Background:
- Numerous synthetic biology tools for cyanobacteria lack reproducible characterization.
- This limits comparability and application of new genetic tools.
Purpose of the Study:
- Assess the reproducibility of a standard microbiological experiment in *Synechocystis* sp. PCC 6803.
- Identify issues in current state-of-the-art procedures and their impact on data comparability.
Main Methods:
- An interlaboratory study involving eight labs.
- Quantification of mVENUS fluorescence to measure promoter activity (P, P, P).
- Measurement of growth rates and standardization of protocols.
Main Results:
- Significant differences in spectrophotometer readings for optical density across labs.
- Varied growth rates observed despite standardized light and CO2.
- ~32% variation in promoter activity measurements between laboratories.
Conclusions:
- Standard reporting of optical density needs supplementation with cell counts or biomass.
- Growth condition reporting for phototrophs requires more detail than just light and CO2.
- Current synthetic biology protocols in cyanobacteria may yield unreproducible results.
