Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Horizontal Gene Transfer among Bacteria by Transformation in Soil and Aquatic Environments

토양 및 수계환경에서 Transformation에 의한 세균들간의 수평적 유전물질 전이

  • 이건형 (군산대학교 자연과학대학 과학기술학부 생물학전공)
  • Published : 2000.06.01
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Abstract

Laboratory studies have revealed that naturally transformable bacteria develop competence under in situ conditions. Thus, the occurrence of competent bacteria in the environment can be considered as a certainty The persistence of free DNA in natural habitats is influenced by nucleolytic degradation and protection from degradation by adsorption to minerals. Although DNA seeded into natural environment was hydrolysed at substantial rates, but was still detectable at low levels after even several weeks. Compared to the number of laboratory based studies, only a few data have been published dealing with transformation of bacteria in the field. Recently, the potential transfer of recombinant DNA (rDNA) from deliberately or accidentally released bacteria to indigenous microbes has raised biosafety issues, since the persistence of rDNA becomes independent of the survival of its original host and leads to unpredictable, long-term ecological effects. The aim of the present review is to summarise recent literature on horizontal gene transfer (HGT) by transformation among bacteria in both soil and aquatic habitat and special emphasis is placed on recent reports which have addressed HGT among bacteria in the field. [Transformation, Horizontal gene transfer (HGT), recombinant DNA (rDNA), Genetically modified microorganisms (GMMs), Biosafety]

실험실에서 형질전환될 수 있는 세균들은 자연환경 조건에서도 형질전환 능력이 발달하는 것으로 알려져 있다. 따라서, 환경 내에서 형질전환 능력이 있는 세균의 존재는 확실한 것으로 여겨진다. DNA는 무기물에 부착된 상태에서는 핵산분해효소에 의한 분해로부터 보호되는 것으로 알려져 있다. 비록 DNA가 토양 속에 분산되어져 일정 비율로 가수분해되더라도, 수 주일 후에도 낮은 비율로 감지될 수 있다. 따라서 free DNA는 자연적 형질전환을 할 수 있을 만큼 충분히 지속될 수 있다. 실험실 조건에서는 세균의 형질전환이 여러 경우 보고되었지만, 자연상태에서 형질전환과 관련된 자료는 매우 적다. 생태학적으로 GMMs로부터 재조합 DNA가 토착 미생물에 전이될 수 있는 잠재력에 대한 문제가 주요 현안이 되었는데, 이는 전이된 DNA가 방출된 세균의 생태학적인 적응력을 변화시켜 생물학적 안전성의 문제를 야기할 수 있기 때문이다. 물론, 방출된 GMMs로부터 재조합 DNA가 토착 미생물에 전이되는 율은 아주 낮은 빈도로 일어나지만, 빈도가 낮다는 것은 그리 중요하지 않다. 왜냐하면, 비록 낮은 빈도로 전이되더라도 유리한 조건을 만나게 되면 전이된 유전자는 선택될 수 있기 때문이다. 이제까지 GMMs는 실험실이나 제한된 환경에서 주로 사용되었지만 앞으로는 개방된 자연 생태계에서 이루어질 전망이다. 그러므로 GMMs가 토착세균에 미치는 영향에 대해서도 연구되어야 하고 동시에 GMMs가 생태계에 방출될 경우 그에 따른 영향평가를 반드시 수행해야 한다.

Keywords

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