Prevalence of cagA EPIYA motifs in Helicobacter pylori among dyspeptic patients in northeast Thailand.
The aims of this study were to determine the prevalence of cagA type in Helicobacter pylori isolated from dyspeptic patients in northeastern Thailand and to determine whether the pattern of cagA EPIYA motifs were associated with clinical outcomes. One hundred and forty-seven H. pylori-infected dyspeptic patients were enrolled, of whom 68 had non-ulcer dyspepsia (NUD), 57 peptic ulcer disease (PUD), 18 gastric cancer (GCA), and 4 other gastroduodenal diseases. PCR and DNA sequence analysis were used to determine the cagA genotype and the pattern of EPIYA motifs. cagA-positive H. pylori were identified in 138 (94%) of H. pylori-infected dyspeptic patients of whom 75 (54%) were of the Western-type, 44 (32%) the East Asian type and 19 (14%) of the other types. The Western type is significantly found in PUD patients (p = 0.0175). The majority of cagA EPIYA was EPIYA-ABC (43%) and EPIYA-ABD (28%). There is no significant correlation between the increase in number of EPIYA-C motifs and clinical outcomes. Thus, the most frequent cagA type found among northeastern Thai dyspeptic patients was the Western cagA type, which is significantly associated with PUD indicating a possible predictive parameter for clinical outcome.
Department of Microbiology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand. chariya@kku.ac.th
Chariya
C
Chomvarin
Karnchanawadee
K
Phusri
Kookwan
K
Sawadpanich
Pisaln
P
Mairiang
Wises
W
Namwat
Chaisiri
C
Wongkham
Chariya
C
Hahnvajanawong
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000595:Amino Acid Sequence; D000942:Antigens, Bacterial / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics*; D001706:Biopsy; D004269:DNA, Bacterial / Q000235:genetics; D004415:Dyspepsia / Q000235:genetics / Q000382:microbiology*; D005260:Female; D005838:Genotype; D016481:Helicobacter Infections / Q000453:epidemiology / Q000235:genetics* / Q000382:microbiology*; D016480:Helicobacter pylori / Q000235:genetics* / Q000302:isolation & purification; D006801:Humans; D008297:Male; D008875:Middle Aged; D010437:Peptic Ulcer / Q000235:genetics / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D015995:Prevalence; D013274:Stomach Neoplasms / Q000235:genetics / Q000382:microbiology*; D013785:Thailand / Q000453:epidemiology
D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D004269:DNA, Bacterial; C080866:cagA protein, Helicobacter pylori