High prevalence of cagA-positive strains in Helicobacter pylori-infected, healthy, young Chinese adults.
BACKGROUND
Cytotoxin-associated gene A (cagA) has been implicated as a potential pathogenic marker for Helicobacter pylori-induced severe gastroduodenal diseases. Although the prevalence of cagA-positive strains has been reported in patient populations from developed countries, only limited information from developing countries is available.


METHODS
Polymerase chain reaction (PCR) in combination with immunoblot analysis was used to determine the prevalence of cagA and its adjacent cagE genes and to evaluate the expression of CagA protein in 55 H. pylori clinical isolates from China.


RESULTS
The expected PCR products derived from H. pylori cagA and cagE genes were identified in all Chinese H. pylori clinical isolates. Similarly, the CagA protein was detected in all 40 isolates tested.


CONCLUSIONS
These results demonstrated that the presence of the cagA gene correlated well with expression of the CagA protein in all surveyed Chinese H. pylori isolates and that infection with cagA-positive H. pylori strains is highly common in China and independent of clinical presentation.
Yang
H
H
Center for Ulcer Research, Department of Medicine, UCLA School of Medicine and Veterans Affairs West Los Angeles Medical Center, California 90073, USA.
Wu
S V
SV
Pichuantes
S
S
Song
M
M
Wang
J
J
Zhou
D
D
Xu
Z
Z
Quan
S
S
Polito
A
A
Walsh
J H
JH
D000293:Adolescent; D000328:Adult; D000942:Antigens, Bacterial / Q000096:biosynthesis / Q000235:genetics; D001426:Bacterial Proteins / Q000096:biosynthesis / Q000235:genetics*; D015153:Blotting, Western; D002681:China; D005260:Female; D015870:Gene Expression; D005787:Gene Frequency; D016481:Helicobacter Infections / Q000453:epidemiology* / Q000382:microbiology; D016480:Helicobacter pylori / Q000235:genetics* / Q000302:isolation & purification* / Q000378:metabolism; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D015995:Prevalence; D012680:Sensitivity and Specificity
D000942:Antigens, Bacterial; D001426:Bacterial Proteins; C080866:cagA protein, Helicobacter pylori