Helicobacter pylori cagA and vacA genotypes in Cuban and Venezuelan populations

Memórias do Instituto Oswaldo Cruz

Diana Ortiz-princz²  Verónica Guariglia-oropeza²  Maira Ávila¹  María Correnti¹  Marianella Perrone¹  Beatriz Gutierrez¹  Javier Torres¹  Francis Megraud¹  María Eugenia Cavazza² 

[1] ,Universidad Central de Venezuela Ministerio del Poder Popular para la Salud Instituto de BiomedicinaCaracas,Venezuela

关键词: Helicobacter pylori;    cagA;    vacA;    chronic gastritis;   

DOI  :  10.1590/S0074-02762010000300016

来源: SciELO

【 摘 要 】

The aim of this study was to determine the presence of Helicobacter pylori cytotoxin-associated gene (cagA)/vacuolating cytotoxin gene (vacA) among patients with chronic gastritis in Cuba and Venezuela. Gastric antrum biopsies were taken for culture, DNA extraction and PCR analysis. Amplification of vacA and cagA segments was performed using two regions of cagA: 349 bp were amplified with the F1/B1 primers and the remaining 335 bp were amplified with the B7629/B7628 primers. The VA1-F/VA1-R set of primers was used to amplify the 259-bp (s1) or 286-bp (s2) product and the VAG-R/VAG-F set of primers was used to amplify the 567-bp (m1) or 642-bp (m2) regions of vacA. cagA was detected in 87% of the antral samples from Cuban patients and 80.3% of those from Venezuelan patients. All possible combinations of vacA regions were found, with the exception of s2/m1. The predominant combination found in both countries was s1/m1. The percentage of cagA+ strains was increased by the use of a second set of primers and a greater number of strains was amplified with the B7629/B7628 primers in the Cuban patients (p = 0.0001). There was no significant difference between the presence of the allelic variants of vacA and cagA in both populations. The predominant genotype was cagA+/s1m1 in both countries. The results support the necessary investigation of isolates circulating among the human population in each region.

【 授权许可】

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