Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Microbial Community Analysis Isolated from Red Starfish (Certonardoa semiregularis) Gut

빨강불가사리(Certonardoa semiregularis)에서 분리된 세균의 군집구조 분석

  • Lee, Hae-Ri (Department of Marine Life Sciences, Jeju National University) ;
  • Park, So-Hyun (Department of Marine Life Sciences, Jeju National University) ;
  • Kim, Dong-Hwi (Department of Marine Life Sciences, Jeju National University) ;
  • Moon, Kyung-Mi (Department of Marine Life Sciences, Jeju National University) ;
  • Heo, Moon-Soo (Department of Marine Life Sciences, Jeju National University)
  • 이해리 (제주대학교 해양생명과학과) ;
  • 박소현 (제주대학교 해양생명과학과) ;
  • 김동휘 (제주대학교 해양생명과학과) ;
  • 문경미 (제주대학교 해양생명과학과) ;
  • 허문수 (제주대학교 해양생명과학과)
  • Received : 2018.04.13
  • Accepted : 2018.04.27
  • Published : 2018.08.30
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Abstract

Although much research has focused on various bioactive substances in starfish, research on microorganisms isolated from starfish is lacking as compared with other natural products. In this study, we investigated bacterial communities in the gut of red starfish (Certonardoa semiregularis) in Jeju Island. In total, 103 bacterial strains were isolated using marine agar and R2A medium. The isolated strains were analyzed and identified using the 16S rRNA gene sequence. Based on an analysis of this gene sequence, the 103 isolated bacteria were classified into four major groups: Proteobacteria (93%: Alpha-proteobacteria, 24.8%; Beta-proteobacteria, 4%; Gammaproteobacteria, 65%) Bacteroidetes (4%), Actinobacteria (2%), and Firmicutes (1%). In addition, the isolates were divided into seven classes (Actinobacteria, Flavobacteria, Bacilli, Sphingobacteria, Alphaproteobacteria, Betaproteobacteria, and Gammaproteobacteria), 15 orders, 19 families, and 24 genera. A phylogenetic analysis revealed two strains, Lysobacter sp. and Pedobacter sp., with similarity of 97.55% and 97.58%, respectively. As the similarity in the 16S rRNA gene sequence was 98% or less compared to previously identified bacteria, the two strains may possibly be classified as a new genus or species. We suggest that additional studies, including biochemical and morphological tests, should be performed to identify the new candidate strains.

불가사리를 이용하여 다양한 생리활성에 대한 연구가 많이 진행되었지만, 다른 천연물 연구에 비해 불가사리로 부터 분리한 미생물에 대한 연구는 부족하다. 이에 본 연구에서는 제주도에서 채집한 극피동물인 빨강불가사리(Certonardoa semiregularis)의 내장으로부터 Marine Agar와 R2A를 이용하여 총 103개의 균주를 분리하여 세균군집에 대해 조사하였다. 분리된 균주들은 16S rRNA유전자를 이용하여 염기서열을 분석 및 동정하였다. 그 결과 주요 계통군은 Proteobacteria (Alpha-proteobacteria 24%, Beta-proteobacteria 4%, Gamma-proteobacteria 65%) 93%, Bacteroidetes 4%, Actinobacteria 2%, Firmicutes 1%로 4개의 문이 확인되었고, 7개의 강(Actinobacteria, Flavobacteria, Bacilli, Sphingobacteria, Alpha-proteobacteria, Beta-proteobacteria, Gamma-proteobacteria), 15개의 목, 19개의 과, 24속이 관찰되었다. 또한 계통 분석 결과 2개의 균주(Lysobacter sp., Pedobacter sp.)가 각각 97.55%, 97.58%로 상동성이 98% 이하로 나타나 새로운 속 또는 종으로 분류될 가능성이 있다고 여겨지며, 표준 균주와 함께 신종 후보 균주에 대한 생화학적, 형태학적 등의 추가적인 신종실험을 향후 진행해야 할 것으로 사료 된다.

Keywords

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