Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Intra-, Inter-specific Variation of Korean Rana (Amphibia: Ranidae) Based on the Partial Sequence of Mitochondrial 16S rDNA

미토콘드리아 16S rDNA부분 염기서열을 이용한 한국산 개구리 속(Amphibia: Ranidae)의 종간, 종내 변이에 대한 연구

  • Published : 2004.03.01
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Abstract

In order to clarify intra-and inter-specific variation of Korean Rana species, the partial DNA sequences of mitochondrial 16S rDNA gene were determined from 6 Korean and 1 Japanese Rana species, DNA sequences from Korean and Japanese species were comparison-analysed within, and also with the sequences from three species of Japanese brown frogs. DNA similarities were calculated as 91.3∼97.3％ among brown frog (R. amurensis coreana, R. dybowskii and R. huanrenensis), as 96.11∼97.26％ among pond frogs (R. nigromaculata and R. planeyi chosenica). Genetic distance of pond frog and wrinkle fyog (R. rugosa) were near than that of pond frog and brown frog. Two clusters were formed brown frogs and the other group by neigh-bor-joining and maximum-likelihood analysis, also the populations of R. nigromaculata were well distinguished between Korean peninsula and Korean island. But result from maximum-likelihood analysis slightly differed from neighbor-joining to cluster of R. rugosa. Further analyses for their population will be necessary to study the phylogenetic status.

한국에 분포하고 있는 개구리 속에 대한 염기서열을 결정하고 상호 비교하여 종간 유전적 변이 정도를 밝히고자 한국산 개구리 속 6종과 일본산 개구리 속 1종에 대한 미토콘드리아 165 rDNA를 분석하였으며, Gene-bank에 수록된 일본산 산개구리류 3종도 함께 비교 분석하여 총 437 bp의 염기서열을 결정하였다. 산개구리류 7종에 대한 similarity는 91.3∼97.3％이며, 참개구리류는 96.1∼97.3％로 나타났다. 또한, 참개구리류와 옴개구리류의 genetic distance가 참개구리류와 산개구리류보다 더 가깝게 나타났다. Neighbor-joining분석에서 참개구리류와 산개구리류로 2개의 cluster를 형성하였는데, 이 중산개구리류는 총 3개의 subcluster를 형성하였다. 또한, 참개구리는 내륙지방과 도서지방에 분포하는 집단이 각각 나눠지는 것은 지리적 격리에 의한 결과라고 사료된다. Maximum-likelihood분석도 NJ 분석 결과와 매우 유사하게 나타났으나 옴개구리(R. rugosa)는 NJ와 ML분석에서 서로 상반된 결과를 나타냈다. 이는 한국산 옴 개구리가 남부지역과 기타 지역에서 유전적 차이가 크게 나타나며, 일본 집단과 외부 특징에서 차이를 보이는 등 문제점을 가지고 있기 때문에 보다 다양한 연구가 이루어져야 올바른 해석 이 가능하리라 판단된다.

Keywords

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