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Chapter 33 : Ecology of Antibiotic Resistance Genes

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Abstract:

This chapter starts with a brief history of the growing public interest in the ecology of resistance genes and then moves on to a survey of some of the conceptual problems that have emerged. It focuses on a few groups of bacteria that are major players in the oral and intestinal ecosystems of humans and animals, the obligate anaerobes. Perhaps the first modern example of the sudden importance of understanding the ecology of antibiotic resistance genes arose in connection with the debate over the safety of GM plants. Studies have shown that many soil bacteria are naturally transformable, although it is still unclear what significance this fact has in the overall ecology of antibiotic resistance genes. Bacteria in and on the human body have participated in the distribution of resistance genes. An interesting case in point is the population of bacteria that makes its home in the periodontal pocket, the region between the gums and the roots of the teeth. Prominent among these are the and species. These bacteria have been of particular interest in dentistry because they are thought to be instrumental in the development of periodontal disease, the main cause of tooth loss in adults. Currently, the treatment for periodontal disease is surgery that cuts into the gums, exposing the buried surface of the teeth to allow scraping of the plaque that has accumulated there and is causing inflammation.

Citation: Salyers A, Vlamakis H, Shoemaker N. 2005. Ecology of Antibiotic Resistance Genes, p 436-445. In White D, Alekshun M, McDermott P (ed), Frontiers in Antimicrobial Resistance. ASM Press, Washington, DC. doi: 10.1128/9781555817572.ch33
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Figure 1

The intestinal bacteria as a resistance gene reservoir and the possible cycle of the bacteria and genes in the environment. Bacteria that normally reside in the human colon (on the left) are normally benign and can transfer resistance genes among themselves. Bacteria that pass through the colon will be in transit long enough to transfer or acquire genes by conjugation and/or transformation or even transduction (shown by solid arrows). The cycle on the right, indicated by dashed lines, follows bacteria that are excreted from the colon in high numbers. Once excreted the bacteria can enter the environment and/or can return to or contaminate other human sites such as skin or the mouth and interact with the microbial communities in these niches before they once again pass through the intestinal tract.

Citation: Salyers A, Vlamakis H, Shoemaker N. 2005. Ecology of Antibiotic Resistance Genes, p 436-445. In White D, Alekshun M, McDermott P (ed), Frontiers in Antimicrobial Resistance. ASM Press, Washington, DC. doi: 10.1128/9781555817572.ch33
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References

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Tables

Generic image for table
Table 1

Percentage of strains that contained antibiotic resistance genes based on a survey by Shoemaker et al. ( )

Citation: Salyers A, Vlamakis H, Shoemaker N. 2005. Ecology of Antibiotic Resistance Genes, p 436-445. In White D, Alekshun M, McDermott P (ed), Frontiers in Antimicrobial Resistance. ASM Press, Washington, DC. doi: 10.1128/9781555817572.ch33
Generic image for table
Table 2

Examples of genes that have been found in both gram-positive and gram-negative commensal bacteria

Citation: Salyers A, Vlamakis H, Shoemaker N. 2005. Ecology of Antibiotic Resistance Genes, p 436-445. In White D, Alekshun M, McDermott P (ed), Frontiers in Antimicrobial Resistance. ASM Press, Washington, DC. doi: 10.1128/9781555817572.ch33

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