RTX TOXIN GENOTYPES AND PHENOTYPES IN ACTINOBACILLUS-PLEUROPNEUMONIAE FIELD STRAINS

被引:79
作者
BECK, M
VANDENBOSCH, JF
JONGENELEN, IMCA
LOEFFEN, PLW
NIELSEN, R
NICOLET, J
FREY, J
机构
[1] UNIV BERN, INST VET BACTERIOL, CH-3012 BERN, SWITZERLAND
[2] INTERVET INT BV, 5830 AA BOXMEER, NETHERLANDS
[3] NATL VET LAB, DK-1503 COPENHAGEN, DENMARK
关键词
D O I
10.1128/JCM.32.11.2749-2754.1994
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Actinobacillus pleuropneumoniae serotype reference strains and 204 A. pleuropneumoniae field strains representing all 12 serotypes and both biovars 1 and 2, obtained from laboratories from various countries worldwide, were analyzed for the presence of the toxin genes apxlC, apxIA, apxIB, apxID, apxIIC, apxIIA, apxIIIC, apxIIIA, apxIIIB, and apxIIID by DNA-DNA hybridization with specific gene probes. Expression of the toxins ApxI, ApxII, and ApxIII was assessed by immunoblot analysis with monoclonal antibodies. The results show that the patterns of apr genes and those of the expressed Apr toxins in biovar 1 field strains are the same as those of the genes and toxins of corresponding serotype reference strain. We found only three strains which had certain apr genes missing compared with the genes in their serotype reference strains. Analysis of the expression of the three toxins showed that nearly all strains expressed their apr genes and produced the same Apr toxins as their serotype reference strain. We found only one strain that did not produce ApxI, although it contained the apxICABD genes, and one strain which did not express ApxII but which contained apxIICA. Several field strains which initially showed that their serotype did not correspond to the apr gene profile of the reference strain and which had an unexpected virulence for the given serotype revealed that their initial serotyping was erroneous. We show that the apr gene profiles are inherent to a given serotype. The method cannot differentiate between all 12 serotypes. However, it allowed us to distinguish five groups of toxin gene patterns which showed Pathological, toxicological, and epidemiological significance. None of the biovar 2 strains contained apxIII genes. The apxI and apxII genes in the biovar 2 strains, however, were the same as those found in the serotype reference strains of biovar 1.
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页码:2749 / 2754
页数:6
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