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. 1992 Aug;58(8):2449–2457. doi: 10.1128/aem.58.8.2449-2457.1992

Sequence variation in the thermostable direct hemolysin-related hemolysin (trh) gene of Vibrio parahaemolyticus.

M Kishishita 1, N Matsuoka 1, K Kumagai 1, S Yamasaki 1, Y Takeda 1, M Nishibuchi 1
PMCID: PMC195802  PMID: 1514791

Abstract

Our previous molecular epidemiologic study with gene probes (H. Shirai, H. Ito, T. Hirayama, Y. Nakamoto, N. Nakabayashi, K. Kumagai, Y. Takeda, and M. Nishibuchi, Infect. Immun. 58:3568-3573, 1990) demonstrated that the gene (trh) encoding a thermostable direct hemolysin-related hemolysin was strongly associated with clinical strains of Vibrio parahaemolyticus. Strain-to-strain variation in the intensities of the hybridization signals observed in the above study also suggested that the trh genes in different strains may have significantly divergent nucleotide sequences. To assess the public health significance of the rare environmental strains which exhibited very weak hybridization signals with the trh gene-specific DNA probe, the trh-like sequence was cloned from one of the environmental strains and the nucleotide sequence was determined in this study. A hemolysin gene (trh2) which was 84% homologous to the trh gene (newly named trh1) and 54.8 to 68.8% homologous to the genes (tdh) encoding thermostable direct hemolysins was detected in the cloned sequence. The trh2 gene product showed a profile of hemolytic activities against various animal erythrocytes different from that of the trh1 gene product. The trh2 gene product was antigenically related (partially identical) to the trh1 and tdh gene products. DNA colony blot and Southern blot hybridization analyses with trh1- and trh2-specific DNA probes showed that the trh1 probe-positive strains exhibiting hybridization signals with varying intensities could be clustered into trh1 and trh2 subgroups. In addition, hybridization analysis with oligonucleotide probes demonstrated significant strain-to-strain variation in the trh1 and trh2 gene sequences.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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