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Journal of Clinical Microbiology, Jun 1996, 1453-1461, Vol 34, No. 6
EM Bik, RD Gouw and FR Mooi
A novel Vibrio cholerae insertion sequence element, designated IS1004, was
characterized and used for DNA fingerprinting of Vibrio spp. IS1004
comprises 628 bp and contains an open reading frame whose product shows a
large degree of sequence identity with the IS200-encoded transposase.
IS1004 was present in one to eight copies in most of the V. cholerae
strains analyzed. The IS1004-generated fingerprints of epidemic V. cholerae
strains with serotype O1 were closely related, although it was possible to
distinguish between the two biotypes, classical and El Tor. Non-O1 serotype
strains generally showed heterogeneous patterns unrelated to those of the
epidemic O1 strains. Several strains were observed with identical or
related fingerprint patterns but expressed different serotypes. Conversely,
strains with different fingerprint patterns but identical serotypes were
also found. These observations indicate that the gene clusters coding for
distinct O antigens may be transferred horizontally between V. cholerae
strains. Two examples of non-O1 strains with a fingerprint resembling that
of epidemic O1 strains were found; they were the O139 Bengal strain and an
O37 strain. The O139 Bengal strain is closely related to the El Tor
biotype. The O37 strain was responsible for a large cholera outbreak in
Sudan in 1968 and was classified as a noncholera vibrio. Our study,
however, shows that the O37 Sudan strain is genetically closely related to
classical O1 strains. Similar to O139 Bengal, O37 Sudan lacked most of the
O1 antigen cluster but did contain flanking genes. Thus, O37 Sudan
represents a second example of an epidemic V. cholerae strain carrying
non-O1 antigens. This study underlines the importance of genotypic methods
for the differentiation of V. cholerae strains and for recognition of
strains with epidemic potential.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
DNA fingerprinting of Vibrio cholerae strains with a novel insertion sequence element: a tool to identify epidemic strains
Molecular Microbiology Unit, National Institute of Public Health and the Environment, Bilthoven, The Netherlands.
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