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Molecular pathogenesis of mycoplasma animal respiratory pathogens
1Dept. Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, IA 50011, USA. fcminion@iastate.edu
Abstract:
Mycoplasmas contain the smallest genomes and are the smallest known free-living organisms, yet little is known about the molecular details of their pathogenic mechanisms. This review focuses on pathogens of production animals, but related species colonize and cause disease in humans, fish and other animals, plants and insects. The general lack of genetic tools and the inability to apply the few that are available to some mycoplasma-host systems has hindered studies of this nature. During the last decade, which was characterized by unparalleled advances in the understanding of bacterial virulence, studies of mycoplasma pathogenesis has languished behind other experimental systems. The one exception has been studies on mycoplasma antigenic variation. The explosion of studies in this area has been due primarily to the fact that they can be performed in vitro without genetic tools and with simple well developed biochemical approaches. Not withstanding that antigenic variation may play an important role in disease, there have been few studies establishing the importance of this phenomenon in vivo for a variety of reasons. The same is true for cell invasion as it has been defined in cell culture systems, which if it occurs in vivo may change the way we think about mycoplasma disease. These advances give insight to an extraordinary group of organisms that interact with their hosts in unique and intriguing ways.
Insights
Mycoplasma pathogens, the smallest free-living organisms, have poorly understood disease mechanisms. Research lags due to limited genetic tools, except for studies on antigenic variation.
Area of Science:
- Microbiology
- Pathogenesis
- Animal Health
Background:
- Mycoplasmas are the smallest known free-living organisms with the smallest genomes.
- Despite their small size, mycoplasmas are significant pathogens across various hosts, including production animals, humans, and plants.
- Understanding their pathogenic mechanisms is crucial but hindered by a lack of genetic tools.
Purpose of the Study:
- To review the current understanding of mycoplasma pathogenic mechanisms, focusing on production animal pathogens.
- To highlight the challenges in studying mycoplasma pathogenesis, particularly the limitations of genetic tools.
- To discuss specific aspects like antigenic variation and cell invasion in the context of disease.
Main Methods:
- Literature review focusing on recent advances in bacterial virulence and mycoplasma pathogenesis.
- Analysis of studies on mycoplasma antigenic variation and cell invasion.
- Discussion of the impact of limited genetic tools on research progress.
Main Results:
- Mycoplasma pathogenesis research has lagged behind other bacterial systems due to limited genetic tools.
- Antigenic variation is a well-studied area due to the availability of in vitro and biochemical approaches.
- The in vivo relevance of antigenic variation and cell invasion requires further investigation.
Conclusions:
- Mycoplasma pathogenesis remains an understudied area, necessitating the development of new research tools.
- Antigenic variation and cell invasion are potential key factors in disease but require more in vivo validation.
- Further research is essential to unravel the unique host-interaction strategies of these extraordinary organisms.