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Team:XMU-China/Project
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Project Name
A bacterial ‘population-control’ device
Project Abstract
We have developed a series of devices which program a bacteria population to maintain at different cell densities. We have designed and characterized the genetic circuit to establish a bacterial ‘population-control’ device in E. coli based on the well-known quorum-sensing system from Vibrio fischeri, which autonomously regulates the density of an E. coli population. The cell density however is influenced by the expression levels of a killer gene (ccdB) in our device. As such, we have regulated the expression levels of the killer gene (ccdB) by site-directed mutagenesis of a luxR promoter (PluxR) and error-prone PCR of gene luxR, and finally we have built a database for a series of mutation sites corresponding to different cell densities. An artificial neural network has then been built to model and predict the cell density of an E. coli population. This work can serve as a foundation for future advances involving fermentation industry and food industry.
