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Chapter 2 : Genomes: a Tale of Convergent Evolution and Specialization through IS Expansion and Genome Reduction

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Genomes: a Tale of Convergent Evolution and Specialization through IS Expansion and Genome Reduction, Page 1 of 2

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Abstract:

Although all species share similar pathogenic properties, each species exhibits peculiar epidemiological characteristics. , , and are most common in developing countries, whereas is more prevalent in developed countries. A remarkable difference between and genomes is the presence of pseudogenes in the former. The second remarkable feature of the genome is the presence of enormous copies of IS elements, which are likely the cause of genomic rearrangements, including deletions, inversions, and translocations that may effectively disrupt the colinearity among different genomes. After the acquisition of the ancestral forms of the virulence plasmid by /enteroinvasive (EIEC), genome reduction by inactivation of the pathway-specific antivirulence loci (AVL) is vital for adaptation in the cytosolic niche. Similar to obligate pathogens, reduced selection pressure might have played an important role in genome reduction, which may have further accelerated terminal evolution and resulted in the increased host specificity. Numerous genes responsible for cell motility cell envelope, carbohydrate transport, and metabolism that are present in were frequently lost in . A combination of various strategies using the basic information provided by genomic research will be helpful in efficient control and prevention of infections.

Citation: Yang J, Sangal V, Jin Q, Yu J. 2011. Genomes: a Tale of Convergent Evolution and Specialization through IS Expansion and Genome Reduction, p 23-39. In Fratamico P, Liu Y, Kathariou S (ed), Genomes of Foodborne and Waterborne Pathogens. ASM Press, Washington, DC. doi: 10.1128/9781555816902.ch2

Key Concept Ranking

Multilocus Variable-Number Tandem-Repeat Analysis
0.43151376
Type III Secretion System
0.41291988
Type II Secretion System
0.41291988
Type III Secretion System
0.41291988
Type II Secretion System
0.41291988
Type IV Secretion Systems
0.4003875
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Figure 1

Evolutionary path of /EIEC from diverse origins of Acquisition of virulence plasmid and pathway-specific reductions are two decisive events in the pathoadaption path. Diverse genomewide reduction occurs because of reduced effectiveness of purifying selection in the cell cytosol. IS expansion and consequent genome rearrangements played a major role in both pathway-specific and genomewide reduction. Formation of pseudogenes is one other mechanism resulting in genome decay.

Citation: Yang J, Sangal V, Jin Q, Yu J. 2011. Genomes: a Tale of Convergent Evolution and Specialization through IS Expansion and Genome Reduction, p 23-39. In Fratamico P, Liu Y, Kathariou S (ed), Genomes of Foodborne and Waterborne Pathogens. ASM Press, Washington, DC. doi: 10.1128/9781555816902.ch2
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Tables

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Table 1

Summary of ongoing /EIEC genome sequencing projects (as of December 2008)

Citation: Yang J, Sangal V, Jin Q, Yu J. 2011. Genomes: a Tale of Convergent Evolution and Specialization through IS Expansion and Genome Reduction, p 23-39. In Fratamico P, Liu Y, Kathariou S (ed), Genomes of Foodborne and Waterborne Pathogens. ASM Press, Washington, DC. doi: 10.1128/9781555816902.ch2
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Table 2

Characteristics of complete genome sequences

Citation: Yang J, Sangal V, Jin Q, Yu J. 2011. Genomes: a Tale of Convergent Evolution and Specialization through IS Expansion and Genome Reduction, p 23-39. In Fratamico P, Liu Y, Kathariou S (ed), Genomes of Foodborne and Waterborne Pathogens. ASM Press, Washington, DC. doi: 10.1128/9781555816902.ch2
Generic image for table
Table 3

IS elements identified in genomes

Citation: Yang J, Sangal V, Jin Q, Yu J. 2011. Genomes: a Tale of Convergent Evolution and Specialization through IS Expansion and Genome Reduction, p 23-39. In Fratamico P, Liu Y, Kathariou S (ed), Genomes of Foodborne and Waterborne Pathogens. ASM Press, Washington, DC. doi: 10.1128/9781555816902.ch2
Generic image for table
Table 4

Known and putative virulence factors in the

Citation: Yang J, Sangal V, Jin Q, Yu J. 2011. Genomes: a Tale of Convergent Evolution and Specialization through IS Expansion and Genome Reduction, p 23-39. In Fratamico P, Liu Y, Kathariou S (ed), Genomes of Foodborne and Waterborne Pathogens. ASM Press, Washington, DC. doi: 10.1128/9781555816902.ch2
Generic image for table
Table 5

Inactivated genes relevant to biochemical reactions used in identification

Citation: Yang J, Sangal V, Jin Q, Yu J. 2011. Genomes: a Tale of Convergent Evolution and Specialization through IS Expansion and Genome Reduction, p 23-39. In Fratamico P, Liu Y, Kathariou S (ed), Genomes of Foodborne and Waterborne Pathogens. ASM Press, Washington, DC. doi: 10.1128/9781555816902.ch2

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