Departmental Papers (Dental)
Detection of Cytolethal Distending Toxin Activity and cdt Genes in Actinobacillus Actinomycetemcomitans Isolates From Geographically Diverse Populations
Date of this Version
Oral Microbiology and Immunology
A cytolethal distending toxin (CDT) found in Actinobacillus actinomycetemcomitans inhibits the eukaryotic cell cycle, which may contribute to the pathogenic potential of the bacterium. The presence of the cdtABC genes and CDT activity were examined in 40 clinical isolates of A. actinomycetemcomitans from Brazil, Kenya, Japan and Sweden. Thirty-nine of 40 cell lysates caused distension of Chinese hamster ovary cells. At least one of the cdt genes was detected in all strains examined. The three cdt genes were detected, by PCR, in 34 DNA samples. DNA from one strain from Kenya did not yield amplicons of the cdtA and cdtB genes and did not express toxic activity. Restriction analysis was performed on every amplicon obtained. PCR-RFLP patterns revealed that the three cdt genes were conserved. These data provided evidence that the cdt genes are found and expressed in the majority of the A. actinomycetemcomitans isolates. Although a quantitative difference in cytotoxicity was observed, indicating variation in expression of CDT among strains, no clear relationship between CDT activity and periodontal status was found.
This is the peer reviewed version of the following article: [Fabris, A. S., DiRienzo, J. M., Wïkstrom, M., & Mayer, M. P. (2002). Detection of cytolethal distending toxin activity and cdt genes in Actinobacillus actinomycetemcomitans isolates from geographically diverse populations. Oral microbiology and immunology, 17(4), 231–238. https://doi.org/10.1034/j.1399-302x.2002.170405.x], which has been published in final form at [https://doi.org/10.1034/j.1399-302x.2002.170405.x]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions
Actinobacillus actinomycetemcomitans, cdt genes, cytolethal distending toxin, periodontitis
Fabris, A. S., DiRienzo, J. M., Wïkstrom, M., & Mayer, M. A. (2002). Detection of Cytolethal Distending Toxin Activity and cdt Genes in Actinobacillus Actinomycetemcomitans Isolates From Geographically Diverse Populations. Oral Microbiology and Immunology, 17 (4), 231-238. Retrieved from https://repository.upenn.edu/dental_papers/141
Date Posted: 01 March 2022
This document has been peer reviewed.