"
Team:EPF-Lausanne/Our Project/T7 promoter variants/selection
From 2011.igem.org
Lysis Selection System
Lysis selection system Main | Lysis Characterization | DNA Recovery | DNA Selection | T7 Promoter VariantsContents |
DNA Selection
Introduction
To round out the experiments for DNA recovery, it is essential that we show that the recovered DNA is in fact plasmid DNA from the relevant lysed cells. This is important because in our selection scheme we are only interested in the plasmids from cells expressing the lysis cassettes, and not the DNA from their neighbors (probably the majority of cells in a real selection).
Experimental Setup
To that end, we again set up an experiment involving two flasks but this time each flask contains two types of cells. For one flask, one culture is a co-transformation of a lysis plasmid and a RFP-containing plasmid and the other is a co-transformation of a negative control plasmid with a GFP-containing plasmid. In the other flask, the reverse is true: lysis is with GFP and negative control is with RFP. This co-culture experiment was prepared by mixing equal amounts of cells from an overnight culture in one big flask. After a 1h culture, we induced lysis with 500 µM IPTG.
Results
