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Journal of Clinical Microbiology, May 1998, p. 1271-1276, Vol. 36, No. 5
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Typing of Helicobacter pylori vacA Gene
and Detection of cagA Gene by PCR and Reverse
Hybridization
L. J.
van
Doorn,1,*
C.
Figueiredo,2
R.
Rossau,3
G.
Jannes,3
M.
van
Asbroeck,3
J. C.
Sousa,4
F.
Carneiro,2 and
W.
G. V.
Quint1
Delft Diagnostic Laboratory, Delft, The
Netherlands1;
IPATIMUP2 and
Faculty of
Pharmacy,4
University of Porto, Porto,
Portugal; and Innogenetics N.V., Industriepark Zwijnaarde, Zwijnaarde,
Belgium3
Received 10 September 1997/Returned for modification 30 December
1997/Accepted 30 January 1998
The present report describes an analysis of two virulence genes of
Helicobacter pylori. Parts of the cagA gene, as
well as parts from the signal (s) and middle (m) regions of the mosaic vacA gene, were amplified with biotin-labelled PCR primers
and the products were subsequently analyzed by a single-step reverse hybridization line probe assay (LiPA). This assay comprises a strip
containing multiple specific probes for the vacA s region (s1a, s1b, and s2 alleles), the vacA m region (m1 and m2
alleles), and the cagA gene. A total of 103 H. pylori-positive materials, including cultured isolates, gastric
biopsy specimens, and surgical specimens from patients living in
Portugal (n = 55) and The Netherlands (n = 48) were tested by the PCR-LiPA. cagA
was detected in 84 and 73% of the Portuguese and Dutch patients,
respectively. vacA typing results, as determined by reverse
hybridization, were completely concordant with those of sequence
analysis. Most Portuguese patients (72%) contained type s1b, whereas
most Dutch patients (61%) contained type s1a (P < 0.001). The method is also very effective at detecting the presence of
multiple genotypes in a single biopsy specimen. The prevalence of
multiple strains in Portuguese patient samples was significantly higher
(29%) than that in Dutch patient samples (8%) (P = 0.001). There was a significant association between the presence of
ulcers or gastric carcinoma and the presence of vacA type
s1 (s1a or s1b; P = 0.008) and cagA
(P = 0.003) genes.
*
Corresponding author. Mailing address: R. de Graafweg
7, P.O. Box 5010, 2625 AD, Delft, The Netherlands. Phone:
31-15-2604577. Fax: 31-15-2604550. E-mail:
L.J.van.Doorn{at}ddl.nl.
Journal of Clinical Microbiology, May 1998, p. 1271-1276, Vol. 36, No. 5
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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