Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Development of a Multiplex PCR Assay for Rapid Identification of Larimichthys polyactis, L. crocea, Atrobucca nibe, and Pseudotolithus elongates

다중 PCR 분석법을 이용한 참조기, 부세, 흑조기 및 긴가이석태의 신속한 종판별법 개발

  • Noh, Eun Soo (Biotechnology Research Division, National Institute of Fisheries Science) ;
  • Lee, Mi-Nan (Biotechnology Research Division, National Institute of Fisheries Science) ;
  • Kim, Eun-Mi (Biotechnology Research Division, National Institute of Fisheries Science) ;
  • Park, Jung Youn (Biotechnology Research Division, National Institute of Fisheries Science) ;
  • Noh, Jae Koo (Biotechnology Research Division, National Institute of Fisheries Science) ;
  • An, Cheul Min (Jeju Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Kang, Jung-Ha (Biotechnology Research Division, National Institute of Fisheries Science)
  • 노은수 (국립수산과학원 생명공학과) ;
  • 이미난 (국립수산과학원 생명공학과) ;
  • 김은미 (국립수산과학원 생명공학과) ;
  • 박중연 (국립수산과학원 생명공학과) ;
  • 노재구 (국립수산과학원 생명공학과) ;
  • 안철민 (국립수산과학원 제주수산연구소) ;
  • 강정하 (국립수산과학원 생명공학과)
  • Received : 2017.03.13
  • Accepted : 2017.04.21
  • Published : 2017.07.30
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Abstract

In order to rapidly identify four drums species, Larimichthys polyactis, L. crocea, Atrobucca nibe, and Pseudotolithus elongates, a highly efficient and quick method has been developed using multiplex polymerase chain reaction (PCR) with species-specific primers. Around 1.4 kbp of the mitochondrial COI gene sequences from the four drums species were aligned, and species-specific forward primers were designed, based on the single nucleotide polymorphism (SNP). The optimal conditions for PCR amplification were selected through cross-reactivity, using a gradient PCR method. The PCR results demonstrated species-specific amplification for each species at annealing temperatures between 50 and $62^{\circ}C$. Multiplex species-specific PCR (MSS-PCR) amplification reactions with four pairs of primers were performed for sixteen specimens of each species. MSS-PCR lead to a species-specific amplification of a 1,540 bp fragment in L. polyactis, 1,013 bp in A. nibe, 474 bp in L. crocea, and 182 bp in P. elongates, respectively. The four different sizes of each PCR product can be quickly and easily detected by single gel electrophoresis. The sensitivity of the MSS-PCR of the DNA was up to $0.1ng/{\mu}l$ as a starting concentration for the four different species tested. These results suggest that MSS-PCR, with species-specific primers based on SNP, can be a powerful tool in the rapid identification of the four drums species, L. polyactis, L. crocea, A. nibe, and P. elongates.

참조기는 민어과에 속하는 우리나라의 중요한 산업 어종 중 하나이다. 최근 과도한 남획과 해양 환경의 변화로 참조기의 어획량이 줄어들자 일부 유통과정에서 유사어종인 부세, 흑조기 및 긴가이석태를 참조기로 둔갑시키는 사례가 빈번하게 발생하고 있다. 이에 본 연구에서는 종 특이 primer를 사용하여 참조기, 부세, 흑조기 및 긴가이석태를 신속하게 분석할 수 있는 방법을 마련하였다. 약 1,400 bp의 미토콘드리아 COI 유전자 분석을 통하여 종간 특이성을 나타내는 단일염기다형성 유전자를 탐색하였으며, PCR 증폭산물의 크기를 고려하여 4개의 종특이적 정방향 primer를 제작하였다. 단일 PCR을 이용한 종간 교차반응을 통하여 최적의 PCR 조건을 확립하였으며, 이후 제작된 4개의 정방향 primer를 혼합하여 4종에 대한 다중 PCR 반응을 진행하였다. 증폭된 산물은 전기영동을 통해 크기에 따라 1,540 bp, 1,013 bp, 470 bp 그리고 182 bp로 분리되었으며, 각각 참조기, 흑조기, 부세, 긴가이석태로 명확하게 판별이 가능하였다. PCR 민감도 측정에서도 모든 종에서 $0.1ng/{\mu}l$의 농도까지 검출 가능함을 확인하였다. 따라서, 본 연구에서 개발된 참조기와 유사어종에 대한 종특이 다중 PCR 분석법은 정확도와 민감도가 우수하여, 불법 유통가능성이 있는 제품에 대한 신속하고 정확한 판별로 식품안전관리에 효과적으로 활용될 것이라 사료된다.

Keywords

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