Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Differentiation of Four Major Gram-negative Foodborne Pathogenic Bacterial Genera by Using ERIC-PCR Genomic Fingerprinting

ERIC-PCR genomic fingerprinting에 의한 주요 식중독 그람 음성 세균 4속의 구별

  • Jung, Hye-Jin (Department of Food Science and Technology, Chung-Ang University) ;
  • Park, Sung-Hee (Department of Food Science and Technology, Chung-Ang University) ;
  • Seo, Hyeon-A (Department of Food Science and Technology, Chung-Ang University) ;
  • Kim, Young-Joon (Department of Food Science and Technology, Chung-Ang University) ;
  • Cho, Joon-Il (Department of Food Science and Technology, Chung-Ang University) ;
  • Park, Sung-Soo (Cheju Traditional Food Institute, Cheju Halla College) ;
  • Song, Dae-Sik (Shinwon Food Industry Co., Ltd.) ;
  • Kim, Keun-Sung (Department of Food Science and Technology, Chung-Ang University)
  • Published : 2005.12.31
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Abstract

Widespread distributions of repetitive DNA elements in bacteria genomes are useful for analysis of genomes and should be exploited to differentiate food-borne pathogenic bacteria among and within species. Enterobacterial repetitive intergenic consensus (ERIC) sequence has been used for ERIC-PCR genomic fingerprinting to identify and differentiate bacterial strains from various environmental sources. ERIC-PCH genomic fingerprinting was applied to detect and differentiate four major Gram-negative food-borne bacterial pathogens, Esherichia coli, Salmonella, Shigella, and Vibrio. Target DNA fragments of pathogens were amplified by ERIC-PCR reactions. Dendrograms of subsequent PCR fingerprinting patterns for each strain were constructed, through which relative similarity coefficients or genetic distances between different strains were obtained numerically. Numerical comparisons revealed ERIC-PCR genotyping is effective for differentiation of strains among and within species of food-borne bacterial pathogens, showing ERIC-PCR fingerprinting methods can be utilized to differentiate isolates from outbreak and to determine their clonal relationships among outbreaks.

본 연구에서는 높은 분리능을 가지고 있을 뿐만 아니라 실험의 재현성과 경제성의 측면에서도 많은 장점을 갖고 있는 ERIC DNA sequence를 응용한 ERIC-PCR을 이용하여 Salmonella, E. coli, Shigella, Vibrio 등 4속의 주요 그람 음성 식중독유발 세균들의 분리 동정 방법을 확립하고자 하였다. ERIC-PCR 결과, E. coli의 경우 0.3kb, 0.42kb 및 1.2kb의 band가 모든 균주에서 공통적으로 확인되었고, Salmonella속으로부터는 0.22kb, 0.4kb 및 0.7kb의 band가 증폭되었다. Shigella속은 모든 표준균주와 분리균주로부터 0.33kb와 1.25kb의 band가 증폭되었으며, S. sonnei의 경우 위의 주요 2개 band 이외에도 대부분의 균주에서 0.44kb, 2.0kb 및 3.05kb의 band가 증폭되어 다른 종의 Shigella와 구별되는 fingerprinting pattern을 나타내었다. 그리고 V. parahaemolyticus의 경우 표준균주와 분리균주 모두 0.51kb와 1.5kb의 band가 증폭되어 V. cholerae, V. mimicus 등과 같은 다른 종의 Vibrio와 구별되는 fingerprinting pattern을 나타내었다. 이와 같이 4속의 모든 식중독 균주마다 ERIC-PCR후 생성되는 fingerprinting pattern에서 3-5개의 공통적인 band가 증폭되는 것이 확인되어 이를 이용한 속 수준의 분리 동정과 이러한 주요 band들 이외의 부수적인 band들을 고려하여 종 수준까지의 분리도 가능함을 확인하였다. 따라서 본 연구의 결과는 ERIC 반복적 DNA 염기서열을 이용한 ERIC-PCR이 식중독균의 분리 동정 방법으로 사용될 수 있음을 확인하였으며, 나아가 더 많은 속(genus)의 식중독세균을 대상으로 한 새로운 분리 동정 방법을 확립하는데도 응용이 될 수 있을 것이다.

Keywords

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