ArticleIrish journal of medical science
Population characteristics of Irish Helicobacter pylori isolates: a tRNA-associated locus.
Article in Irish journal of medical science. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed, 3 citations in OpenAlex.
- Fine-structure molecular typing of Irish Helicobacter pylori isolates and their genetic relatedness to strains from four different continents.Journal of clinical microbiology · 2003Article
- Comparison of genetic divergence and fitness between two subclones of Helicobacter pylori.Infection and immunity · 2001Article
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Authors and funding
4 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundA strain-variable transfer RNA-associated-locus (trl) was present in 50% of Irish Helicobacter pylori (H. pylori), isolates and did not correlate with the origin of the isolates.
aimTo associate a particular genotype or phenotype to trl status in H. pylori by further screening the isolates from the original study for the presence of known genotypic and phenotypic characteristics.
methodsForty two clinical isolates were screened for the presence of the cagA, vacA, iceA1 and vapD genes by Southern or DNA dot blot analysis. Western blot analysis was performed using antibodies to CagA, VacA, Lewis X (Le(x)) and Lewis Y (Le(y)). Plasmids were identified by the alkaline lysis method.
resultsThe cagA gene was present in 29 (69%) of isolates screened and 21 (50%) produced the CagA protein. The vacA gene was detected in all of the isolates while VacA was expressed in 71.4%. The iceA1 and vapD loci were detected in 73.8% and 71.4% respectively. Le(x) was expressed in 42.9% and Le(y) in 38.1% of the isolates. Expression of both Lewis antigens was detected in 7.1% while in 30.9% neither antigen was detected. Plasmids were present in 47.6%. There was no association between the trl status of isolates and any of the above. There were no significant associations between the phenotypic and genotypic characteristics studied and peptic ulcer disease or non-ulcer dyspepsia.
conclusionThe strain-variable tRNA-associated locus is independent of the vacA/VacA, cagA/CagA, Lewis X, Lewis Y, iceA1, vapD and plasmid status in the population of Irish H. pylori isolates studied.
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