Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Heterogeneity Analysis of the 16S rRNA Gene Sequences of the Genus Vibrio

Vibrio 속 16S rRNA 유전자 염기서열의 이질성 분석

  • Ki, Jang-Seu (Department of Life Science, Sangmyung University)
  • Received : 2009.12.04
  • Accepted : 2009.12.23
  • Published : 2009.12.31
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Abstract

Bacterial 16S rRNA gene sequences have been widely used for the studies on molecular phylogeny, evolutional history, and molecular detections. Bacterial genomes have multiple rRNA operons, of which gene sequences sometimes are variable. In the present study, heterogeneity of the Vibrio 16S rRNA gene sequences were investigated. Vibrio 16S rRNA sequences were obtained from GenBank databases, considering the completion of gene annotation of Vibrio genome sequences. These included V. cholerae, V. harveyi, V. parahaemolyticus, V. splendidus, and V. vulnificus. Chromosome 1 of the studied Vibrio had 7~10 copies of the 16S rRNA gene, and their intragenomic variations were less than 0.9% dissimilarity (more than 99.1% DNA similarity). Chromosome 2 had none or single 16S rRNA gene. Intragenomic 16S rRNA genotypes were detected at least 5 types (V. vulnificus #CMCP6) to 8 types (V. parahaemolyticus #RIMD 2210633, V. harveyi #ATCC BAA-1116). These suggest that Vibrio has high heterogeneity of the 16S rRNA gene sequences.

세균 16S rRNA 유전자 염기서열은 분자계통분류, 진화역사 규명, 미생물 검출 등 다양한 목적으로 이용되어 왔다. 세균 제놈(genome)은 multiple rRNA 오페론을 갖고 있으며, 이들 유전자 염기서열은 일부 변이가 있는 것으로 알려져 있다. 본 연구에서는 Vibrio 속의 16S rRNA 유전자 염기서열을 이용하여 세포 내 16S rRNA의 이질성을 규명하였다. 분석은 GenBank 자료 중에서 제놈 염기서열 annotation이 완료된 V. cholerae, V. harveyi, V. parahaemolyticus, V. splendidus, V. vulnificus를 이용하여 실시하였다. Vibrio 속은 1번 염색체에 7~10개의 16S rRNA 유전자 copy를 갖고 있으며, 이들의 세포 내 유전자 변이는 0.9% 이하 상이성(99.1%이상 DNA 상동성)을 보였다. 2번 염색체에서는 16S rRNA 유전자가 1개 이하로 존재하였다. 유전체내 16S rRNA 유전형은 최소 5개(V. vulnificus #CMCP6)에서 최대 8개(V. parahaemolyticus #RIMD 2210633, V. harveyi #ATCC BAA-1116)로 조사되었다. 본 결과는 Vibrio 속의 16S rRNA 유전자 염기서열이 높은 이질성을 갖는 것을 제시해 준다.

Keywords

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