Journal of Microbiology

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MINIREVIEW] Importance of differential identification of Mycobacterium tuberculosis strains for understanding differences in their prevalence, treatment efficacy, and vaccine development: Hansong Chae , Sung Jae Shin; J. Microbiol. 2018;56(5):300-311. Published online May 2, 2018; DOI: https://doi.org/10.1007/s12275-018-8041-3

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Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), remains a serious global health problem in the 21st century because of its high mortality. Mtb is an extremely successful human-adapted pathogen that displays a multifactorial ability to control the host immune response and to evade killing by drugs, resulting in the breakdown of BCG vaccine-conferred anti-TB immunity and development of multidrug-resistant (MDR) and extensively drug-resistant (XDR) Mtb. Although genetic components of the genomes of the Mtb complex strains are highly conserved, showing over 99% similarity to other bacterial genera, recently accumulated evidence suggests that the genetic diversity of the Mtb complex strains has implications for treatment outcomes, development of MDR/XDR Mtb, BCG vaccine efficacy, transmissibility, and epidemiological outbreaks. Thus, new insights into the pathophysiological features of the Mtb complex strains are required for development of novel vaccines and for control of MDR/XDR Mtb infection, eventually leading to refinement of treatment regimens and the health care system. Many studies have focused on the differential identification of Mtb complex strains belonging to different lineages because of differences in their virulence and geographical dominance. In this review, we discuss the impact of differing genetic characteristics among Mtb complex strains on vaccine efficacy, treatment outcome, development of MDR/ XDR Mtb strains, and epidemiological outbreaks by focusing on the best-adapted human Mtb lineages. We further explore the rationale for differential identification of Mtb strains for more effective control of TB in clinical and laboratory settings by scrutinizing current diagnostic methods.

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Journal Article

Genetic Diversity of Multi-resistant Salmonella enterica Serotype Typhimurium Isolates from Animals and Humans: Yong-Ku Woo , Su-Hwa Lee; J. Microbiol. 2006;44(1):106-112.; DOI: https://doi.org/2329 [pii]

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Abstract: In this study, the genetic diversities of multi-resistant Salmonella typhimurium (ST) isolates were analyzed via the application of both pulsed field gel electrophoresis (PFGE) and Polymerase chain reaction (PCR) analysis methods, using 6 kinds of primers (REP, ERIC, SERE, BOX, P-1254 and OPB-17). And their discriminative abilities (DA) were also compared in order to determine the most effective and reliable analysis method. 118 S. typhimurium isolates, cultured from diverse animals and human patients in Korea beginning in 1993, were analyzed and subjected to a comparison of Simpson’s index of diversity (SID), using both PFGE and PCR methods. PFGE by XbaI enzyme digestion allowed for discrimination into 9 pulsotypes, with high SID values (0.991) on the genomic DNA level. This shows that PFGE is a very discriminative genotypic tool, and also that multiple clones of S. typhimurium isolates had existed in domestic animals and humans in Korea since 1993. However, we could ultimately not to trace the definitive sources or animal reservoirs of specific S. typhimurium isolates examined in this study. Depending on the SID values, the combined
method
(7 kinds of method) was found to be the most discriminative method, followed by (in order) SERE-PCR, REP-PCR, ERIC-PCR, PFGE & OPB-17 (RAPD), P-1254 (RAPD), and BOX-PCR at the 80% clone cut-off value. This finding suggests that the REP-PCR method (which utilizes 4 primer types) may be an alternative tool to PFGE for the genotyping of S. typhimurium isolates, with comparable cost, time, and labor requirement. The establishment of a highly reliable and discriminatory method for epidemiologic analysis is considered necessary in order for researchers to trace the sources of specific pathogens and, consequently, to control and prevent the spread of epidemic S. typhimurium isolates to humans.

Genotyping of Six Pathogenic Vibrio Species Based on RFLP of 16S rDNAs for Rapid Identification: Young-Jun Yoon , Kyung-Hwan Im , Young-Hwan Koh , Seong-Kon Kim , Jung-Wan Kim; J. Microbiol. 2003;41(4):312-319.

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Abstract: In an attempt to develop a method for rapid and accurate identification of six Vibrio species that are clinically important and most frequently detected in Korea, 16S rDNA restriction fragment length polymorphism (RFLP) of Vibrio type strains, as well as environmental isolates obtained from the Korean coastal area, was analyzed using ten restriction endonucleases. Digestion of the 16S rDNA fragments amplified by polymerase chain reaction (PCR) with the enzymes gave rise to 2~6 restriction patterns for each digestion for 47 Vibrio strains and isolates. An additional 2~3 restriction patterns were observed for five reference species, including Escherichia coli, Aeromonas hydrophila, A. salmonicida, Photobacterium phosphoreum, and Plesiomonas shigelloides. A genetic distance tree based on RFLP of the bacterial species correlated well with that based on 16S rDNA sequences. The very small 16S rDNA sequence difference (0.1%) between V. alginolyticus and V. parahaemolyticus was resolved clearly by RFLP with a genetic distance of more than 2%. RFLP variation within a species was also detected in the cases of V. parahaemolyticus, V. proteolyticus, and V. vulnificus. According to the RFLP analysis, six Vibrio and five reference species were assigned to 12 genotypes. Using three restriction endonucleases to analyze RFLP proved sufficient to identify the six pathogenic Vibrio species.

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