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Gene transfer in the gastrointestinal tract
T Netherwood1, R Bowden, P Harrison
1Department of Biological and Nutritional Sciences, University of Newcastle-upon-Tyne, Newcastle-upon-Tyne NE1 7RU, Great Britain. trudy.netherwood@newcastle.ac.uk
Applied and Environmental Microbiology
|November 5, 1999
Summary
In vitro gene transfer methods underestimate in vivo rates. Forced filter mating simulated gut plasmid transfer, but liquid mating did not, highlighting limitations in current laboratory techniques for studying bacterial conjugation.
Area of Science:
- Microbiology
- Genetics
- Molecular Biology
Background:
- Bacterial conjugation is a key mechanism for horizontal gene transfer.
- Plasmid transfer rates in the gut are crucial for understanding microbial ecology and evolution.
- In vitro methods are commonly used to study bacterial conjugation but may not accurately reflect in vivo conditions.
Purpose of the Study:
- To compare in vivo and in vitro plasmid transfer rates.
- To evaluate the efficacy of different in vitro methods for simulating gut conjugation.
- To assess the underestimation of gene transfer rates by standard laboratory techniques.
Main Methods:
- Determined the in vivo transfer rate of plasmid pAMbeta1 in the gut.
- Attempted to replicate in vivo transfer rates using in vitro forced filter mating.
- Attempted to replicate in vivo transfer rates using in vitro liquid culture matings.
Main Results:
- The maximum in vivo transfer rate of plasmid pAMbeta1 in the gut was 0.03 transconjugant per recipient cell.
- Forced filter mating in vitro could simulate this transfer rate.
- No plasmid transfer was detected in liquid culture matings in vitro.
Conclusions:
- In vitro methods, specifically liquid mating, significantly underestimate in vivo gene transfer rates.
- Forced filter mating offers a more realistic in vitro model for studying gut plasmid transfer.
- Current laboratory techniques require refinement to accurately predict in vivo gene transfer dynamics.