Chapter 5 : Taxonomy of the Genus

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This chapter describes the taxonomic characteristics of the genus and discusses methods used to differentiate among species. It provides an overview of biochemical and other methods to differentiate and species. Biochemical methods include DNA-DNA hybridization, protein electrophoresis and cellular fatty acid analysis. A summary of the characteristics of cultivated species shows that discrimination between some species may rely on only one differential feature. There are currently 11 validated enterohepatic species and several others that await validation or further description. The Bird-A isolated was later classified as ; the other closely related organisms are not formally named and are still referred to as sp. Bird-B and Bird-C because they are represented by only two isolates for one species and one for the other. At present, despite its panmictic population structure, a polyphasic approach to taxonomy that is based on level of whole-genome DNA-DNA hybridization clearly identifies as a single species.

Citation: Solnick J, Vandamme P. 2001. Taxonomy of the Genus, p 39-51. In Mobley H, Mendz G, Hazell S (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555818005.ch5

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16s rRNA Sequencing
Helicobacter pylori
Gram-Negative Bacteria
Horizontal Gene Transfer
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Figure 1

Phylogenetic tree for 18 validated species, 2 species, and 9 additional provisional species, based on 16S rRNA sequence. The scale bar represents a 1% difference in nucleotide sequence as determined by measuring the length of horizontal lines connecting any two species. The tree was constructed from the differences matrix (see Table 4 ) using TREEVIEW ( a).

Citation: Solnick J, Vandamme P. 2001. Taxonomy of the Genus, p 39-51. In Mobley H, Mendz G, Hazell S (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555818005.ch5
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Generic image for table
Table 1

Characteristics of cultivated species

Citation: Solnick J, Vandamme P. 2001. Taxonomy of the Genus, p 39-51. In Mobley H, Mendz G, Hazell S (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555818005.ch5
Generic image for table
Table 2

Gastric taxa

Citation: Solnick J, Vandamme P. 2001. Taxonomy of the Genus, p 39-51. In Mobley H, Mendz G, Hazell S (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555818005.ch5
Generic image for table
Table 4

Distance matrix based on 16S rRNA comparisons

Citation: Solnick J, Vandamme P. 2001. Taxonomy of the Genus, p 39-51. In Mobley H, Mendz G, Hazell S (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555818005.ch5
Generic image for table
Table 3

Enterohepatic taxa

Citation: Solnick J, Vandamme P. 2001. Taxonomy of the Genus, p 39-51. In Mobley H, Mendz G, Hazell S (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555818005.ch5

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