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Chapter 4 : The Genomics of and Beyond

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The Genomics of and Beyond, Page 1 of 2

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Abstract:

The primary motivation for the switch from generating sequence data to analyzing sequence data was the pace at which genomic information became available, and this chapter focuses on a few of the findings that emerged from the comparative genomics of . Based on disease potential in humans, strains can be broadly classified as (i) harmless commensals, (ii) intestinal pathogens, and (iii) those capable of infecting extraintestinal sites. An active region of genome evolution is the mutS-rpoS intergenic region. Both the mutS and rpoS genes are highly conserved among strains, but the intergenic region between them can vary from 9.8 kb in some enteropathogenic (EPEC) strains to 6.9 kb in K-12 and some extraintestinal pathogenic (ExPEC) strains to 3.7 kb in O157:H7 strains. The polymorphism in this genomic segment is likely related to the high frequency of mutations observed in both mutS and rpoS. In addition to the substantial role that gene acquisition has played in the evolution and formation of pathogenic lineages, mutations that alter or abolish protein functions have also been implicated in the accelerated adaptation of to diverse environments. The most extensive study of comparative genomics to date includes 20 / strains and one strain. In summary, the genomes of and other bacteria have been influenced by numerous factors, but in the case of their overall size and complexity, nonadaptive processes, such as mutation and genetic drift, appear to be more important.

Citation: Kuo C, Ochman H, Raghavan R. 2011. The Genomics of and Beyond, p 31-42. In Walk S, Feng P (ed), Population Genetics of Bacteria. ASM Press, Washington, DC. doi: 10.1128/9781555817114.ch4

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Mobile Genetic Elements
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Type III Secretion System
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Figure 1.

Association between genome size and gene number in sequenced strains of and .

Citation: Kuo C, Ochman H, Raghavan R. 2011. The Genomics of and Beyond, p 31-42. In Walk S, Feng P (ed), Population Genetics of Bacteria. ASM Press, Washington, DC. doi: 10.1128/9781555817114.ch4
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