Creating a Transformable Strain of E. coli for Genetic Studies
Author Information
Author(s): Hobson Neil, Price Nancy L, Ward Jordan D, Raivio Tracy L
Primary Institution: University of Alberta
Hypothesis
We sought to identify and inactivate the responsible gene(s) of the restriction-modification system in E. coli strain E2348/69 to create a strain that could be easily transformed.
Conclusion
The EPEC strain E2348/69 utilizes a type I restriction-modification system to limit entry of new DNA, but the hsdR mutant strain can be transformed more efficiently without affecting its virulence.
Supporting Evidence
- The hsdR mutant strain showed transformation efficiency up to four orders of magnitude higher than the parent strain.
- NH4 was indistinguishable from E2348/69 in tissue culture infection model assays.
- The modification capacity of NH4 remained intact, allowing transformation of normally recalcitrant plasmids.
Takeaway
Scientists made a special version of a bacteria that can take in new DNA much easier, which helps them study how the bacteria cause sickness without changing how sick it can make you.
Methodology
The study involved bioinformatics to identify genes, construction of a mutant strain, and transformation efficiency tests with various plasmids.
Limitations
The study does not address the in vivo fitness of the mutant strain compared to the wild type.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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