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Background   H. pylori  ( Helicobacter pylori ) is the major causative agent of chronic active gastritis. The population of  H. pylori  shows a high genomic variability among isolates. And the polymorphism of repeat-units of genomics had participated the important process of evolution. Its long term colonization of the stomach caused different clinical outcomes, which may relate to the high degree of genetic variation of  H. pylori . A variety of molecular typing tools have been developed to access genetic relatedness in  H. pylori  isolates. However, there is still no standard genotyping system of this bacterium. The MLVA (Multi-locus of variable number of tandem repeat analysis) method is useful for performing phylogenetic analysis and is widely used in bacteria genotyping; however, there's little application in  H. pylori  analysis. This article is the first application of the MLVA method to investigate  H. pylori  from different districts and ethnic groups of China.    Results  MLVA of 12 VNTR loci with high discrimination power based on 30 candidates were performed on a collection of 202 strains of  H. pylori  which originated from five regions of China and Japan. Phylogenetic tree was constructed using MLVA profiles. 12 VNTR loci presented with high various polymorphisms, and the results demonstrated very close relationships between genotypes and ethnic groups.    Conclusions  This study used MLVA methodology providing a new perspective on the ethnic groups and distribution characteristics of  H. pylori .

Genotyping analysis of Helicobacter pylori using multiple-locus variable-number tandem-repeats analysis in five regions of China and Japan