Analysis of geospecific markers for Helicobacter pylori variants in patients from Japan and Nigeria by triple-locus nucleotide sequence typing
| Autor: | D. S. Tompkins, Robert J. Owen, Greg Naylor, Takuji Gotada, Jacqueline Xerry |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Adult
DNA Bacterial Genetic Markers Male Genotype Molecular Sequence Data Nigeria Locus (genetics) Biology Microbiology Helicobacter Infections Bacterial Proteins Japan Humans CagA Typing Allele Gene Phylogeny Aged Genetics Antigens Bacterial Molecular Epidemiology Polymorphism Genetic Base Sequence Helicobacter pylori Phylogenetic tree Nucleic acid sequence Genetic Variation Membrane Transport Proteins Middle Aged Housekeeping gene Genes Bacterial Female |
| Zdroj: | Microbiology. 150:151-161 |
| ISSN: | 1465-2080 1350-0872 |
| DOI: | 10.1099/mic.0.26467-0 |
| Popis: | Human migrations and geographical separation over long periods may have resulted in ecologically distinct populations of Helicobacter pylori infecting individuals in different continents. This study used nucleotide sequence analysis with the aim of defining population-specific genomic motifs in isolates from East Asian and African dyspeptic patients. Sequences of internal fragments (542-627 bp) of three housekeeping genes (ureI, ahpC and atpA) were analysed for 85 isolates from individuals in Japan and China (30 isolates), Nigeria and South Africa (14 isolates), the United Kingdom (32 isolates), and nine miscellaneous reference strains. Phylogenetic analyses showed a high degree of intra-set relatedness amongst sequences from the Japanese and Nigerian isolates, with each robustly segregated as distinct lineages irrespective of cagA presence and vacA allelic type. All strains had unique combined sequence types except for identical paired (antrum/corpus) isolates. Population-specific polymorphisms were identified within each gene which were combined to provide unique motifs defining the Japanese and Nigerian regional populations. The alleles were present at variable frequencies in UK and South African isolates. The findings provide unique evidence of positive selection for conserved nucleotide sites linked to the geographical separation in Japan of a strain subpopulation for which we propose the designation H. pylori geovar 'orientalis'. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|