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Chapter 11 : Are the vap Regions of Dichelobacter nodosus Pathogenicity Islands?

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Are the vap Regions of Dichelobacter nodosus Pathogenicity Islands?, Page 1 of 2

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Abstract:

The gram-negative anaerobic bacterium is the principal causative agent, since only can initiate the infection when applied to the hoof as a pure culture. The virulence-associated protein () regions of the chromosome were isolated as DNA sequences which were present in the virulent strain A198 but absent from the benign strain C305. It also resulted in the isolation of a different segment of the genome associated with virulence, the virulence-related locus () region, which is discussed in this chapter. The determination of the complete DNA sequence of several bacterial genomes has allowed us to search for homologs of the genes and to examine their arrangement. A putative origin of replication has been identified within the regions, consisting of repeats of two related 21-bp sequences flanked by two AT-rich sequences, with a DnaA box located nearby. The regions may influence virulence by altering the expression of neighboring genes or by direct action of the gene products, such as inhibition of cell division. The major reason for disputing the classification of the regions of as pathogenicity islands (PAIs) is that there is at present no evidence for a direct role of the gene products in virulence. In addition to the regions, five other genetic elements that are integrated into the genome have been identified. Some of these may also be classified as PAIs when their role in virulence has been determined.

Citation: Cheetham B, Whittle G, Katz M. 1999. Are the vap Regions of Dichelobacter nodosus Pathogenicity Islands?, p 203-218. In Kaper J, Hacker J (ed), Pathogenicity Islands and Other Mobile Virulence Elements. ASM Press, Washington, DC. doi: 10.1128/9781555818173.ch11

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Figures

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Figure 1

Map of the regions from A198 and H1215 and the plasmid from strain AC3577. The numbers show the distance (in kilobases) from the leftmost site in region 1, strain A198. The restriction sites shown are HI (B), RI (E), III (H), I (K), I (N), l (S), and I (X). The major potential genes are indicated by open arrows. Repeated sequences ( ) are indicated as follows: 19-bp sites are indicated by small open boxes, 103-bp repeats or partial copies are indicated by small shaded boxes, 102-bp repeats or partial copies are indicated by small solid boxes, and the putative origin of replication is indicated by a large shaded box. The tRNA- genes are indicated by solid triangles. DNA sequences found in region 2 but not in region 1 are indicated by boxes on the scale line for region 2. The complete DNA sequence of regions 1 and 3 ( ) and part of the DNA sequences of region 2 ( ) and the plasmid ( ) have been determined. The map of the region of strain H1215 is based on the results of Southern blotting and PCR experiments ( ).

Citation: Cheetham B, Whittle G, Katz M. 1999. Are the vap Regions of Dichelobacter nodosus Pathogenicity Islands?, p 203-218. In Kaper J, Hacker J (ed), Pathogenicity Islands and Other Mobile Virulence Elements. ASM Press, Washington, DC. doi: 10.1128/9781555818173.ch11
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Image of Figure 2
Figure 2

Positions of integrated genetic elements in A198 (virulent) and C305 (benign). The tRNA genes are shown as black triangles. The figure is not drawn to scale.

Citation: Cheetham B, Whittle G, Katz M. 1999. Are the vap Regions of Dichelobacter nodosus Pathogenicity Islands?, p 203-218. In Kaper J, Hacker J (ed), Pathogenicity Islands and Other Mobile Virulence Elements. ASM Press, Washington, DC. doi: 10.1128/9781555818173.ch11
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Tables

Generic image for table
Table 1

Sequence analysis of regions 1 and 3of A198

Citation: Cheetham B, Whittle G, Katz M. 1999. Are the vap Regions of Dichelobacter nodosus Pathogenicity Islands?, p 203-218. In Kaper J, Hacker J (ed), Pathogenicity Islands and Other Mobile Virulence Elements. ASM Press, Washington, DC. doi: 10.1128/9781555818173.ch11

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