Chapter 2 : Understanding the Model and the Menace: a Postgenomic View of

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Understanding the Model and the Menace: a Postgenomic View of , Page 1 of 2

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This chapter discusses the insights into pathogenicity and the wider processes of genome evolution that have resulted from the sequencing of the K-12 genome, and, more recently, those from a number of pathogenic strains, including several from the related “genus” . It also discusses the available resources for genomics and the progress that has been made in recent years toward a complete understanding of biology. Genes that are acquired by horizontal transfer subsequently undergo a process of amelioration as their base composition becomes acclimatized to the new host. Programs such as BLAST can be used to identify unexpected similarities between genes in phylogenetically distinct species, although it should be noted that BLAST results do not necessarily correspond to those from more robust phylogenetic analyses. Interestingly, strains classified as group B2 are rarely found as human commensals, and the group includes many strains with extraintestinal pathogenic (ExPEC) virulence determinants. As with enterohemorrhagic (EHEC) O157:H7, serotype 2a was an obvious target for whole-genome sequencing because of its importance as a pathogen. The processes of genome evolution are clear from the genome sequences already available.

Citation: Chaudhuri R, Thomas G. 2007. Understanding the Model and the Menace: a Postgenomic View of , p 21-48. In Pallen M, Nelson K, Preston G (ed), Bacterial Pathogenomics. ASM Press, Washington, DC. doi: 10.1128/9781555815530.ch2

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Type III Secretion System
Type II Secretion System
Type IV Secretion Systems
Restriction Fragment Length Polymorphism
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Phylogenetic relationships between the strains in the ECOR collection, as assessed by MLEE ( ). Data were obtained from http://foodsafe.msu.edu/whittam, and a neighbor-joining tree was generated by neighbor, part of the PHYLIP package. The tree was rooted using group B2 as an outgroup ( ).

Citation: Chaudhuri R, Thomas G. 2007. Understanding the Model and the Menace: a Postgenomic View of , p 21-48. In Pallen M, Nelson K, Preston G (ed), Bacterial Pathogenomics. ASM Press, Washington, DC. doi: 10.1128/9781555815530.ch2
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genome projects completed and underway as of April 2006

Citation: Chaudhuri R, Thomas G. 2007. Understanding the Model and the Menace: a Postgenomic View of , p 21-48. In Pallen M, Nelson K, Preston G (ed), Bacterial Pathogenomics. ASM Press, Washington, DC. doi: 10.1128/9781555815530.ch2
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Selected online resources for genomics

Citation: Chaudhuri R, Thomas G. 2007. Understanding the Model and the Menace: a Postgenomic View of , p 21-48. In Pallen M, Nelson K, Preston G (ed), Bacterial Pathogenomics. ASM Press, Washington, DC. doi: 10.1128/9781555815530.ch2

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