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Transposon mutagenesis of Mycoplasma gallisepticum
Patricia L Whetzel1, Linda L Hnatow, Calvin L Keeler
1Department of Animal and Food Sciences, College of Agriculture and Natural Resources, University of Delaware, Newark, DE 19717-1303, USA.
Abstract:
There are few systems available for studying the genetics of the important avian respiratory pathogen, Mycoplasma gallisepticum. These techniques are needed to develop a mechanism to study the molecular pathogenesis of M. gallisepticum. Tn916 has the ability to transpose into the M. gallisepticum genome by both transformation and conjugation. In this study, PEG-mediated transformation was employed for the transfer of Tn916 into M. gallisepticum and create a transposon mutant library. Transformants were obtained at a frequency of approximately 5 x 10(-8) per recipient CFU. A total of 424 MG/Tn916 mutants were constructed and sequence data from the transposon junctions of 71 mutants was obtained and used to identify transposon insertion sites. Insertions were found throughout the genome in nearly all of the major gene categories, making this the first extensive characterization of a transposon mutant library of M. gallisepticum. Transposon stability was also examined, and it was determined that for two mutants the element was stably maintained in vivo in the absence of selective pressure.
Insights
Researchers developed a new genetic system for Mycoplasma gallisepticum, an avian pathogen. This system uses Tn916 transposon mutagenesis to create a library for studying the pathogen
Area of Science:
- Microbiology
- Genetics
- Avian Pathogens
Background:
- Limited genetic tools exist for Mycoplasma gallisepticum, a significant avian respiratory pathogen.
- Understanding the molecular pathogenesis of Mycoplasma gallisepticum requires robust genetic manipulation systems.
Purpose of the Study:
- To establish a method for creating a transposon mutant library of Mycoplasma gallisepticum.
- To characterize the insertion sites and stability of transposons within the Mycoplasma gallisepticum genome.
Main Methods:
- Utilized PEG-mediated transformation for the transfer of the Tn916 transposon into Mycoplasma gallisepticum.
- Constructed a library of 424 Mycoplasma gallisepticum/Tn916 mutants.
- Sequenced transposon junctions from 71 mutants to identify insertion sites.
Main Results:
- Achieved transformation frequencies of approximately 5 x 10(-8) per recipient CFU.
- Identified transposon insertions distributed throughout the Mycoplasma gallisepticum genome across major gene categories.
- Demonstrated stable maintenance of the Tn916 element in vivo for two mutants without selective pressure.
Conclusions:
- This study presents the first extensive characterization of a transposon mutant library for Mycoplasma gallisepticum.
- The developed system provides a valuable tool for genetic studies and understanding the molecular pathogenesis of this avian pathogen.
- The stability of the transposon in vivo suggests its utility for future genetic analyses.