Genomic Comparison of cag pathogenicity island (PAI)-positive and -negative Helicobacter pylori strains: identification of novel markers for cag PAI-positive strains.
Infect Immun 2005;
73:3794-8. [PMID:
15908415 PMCID:
PMC1111835 DOI:
10.1128/iai.73.6.3794-3798.2005]
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Abstract
In an analysis of Helicobacter pylori genomic DNA by macroarray methodology, genomic DNA from a panel of cag pathogenicity island (PAI)-negative H. pylori clinical isolates failed to hybridize with 27 genes located outside the cag PAI in a cag PAI-positive reference strain. PCR analyses confirmed that HP0217 (encoding a lipopolysaccharide biosynthetic protein) and HP1079 (encoding a protein of unknown function) were present significantly more frequently in cagA-positive strains than in cagA-negative strains. A low G+C content of these two genes suggests they were acquired by horizontal transfer events.
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