Korean Journal of Plant Tissue Culture (식물조직배양학회지)

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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(CA/GT)n Simple Sequence Repeat DNA Polymorphism in Chlamydomonas reinhardtii

녹조류 Chlamydomonas reinhardtii의 (CA/GT)n Simple Sequence Repeat DNA 다형현상

  • ;
  • ;
  • Marvin W. FAWLEY
  • 강태진 (충남농촌진흥원 원예과) ;
  • 양덕춘 (한국인삼연초연구원 유전생리부) ;
  • Published : 1997.03.01
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Abstract

Simple sequence repeats (SSR) are widely dispersed throughout eukaryotic genomes, highly polymorphic, and easily typed using polymerase chain reaction (PCR). The objective of this study was to determine the polymorphism of different Chlamydomonas reinhartdtii strains and to determine the mode of inheritance of the SSR locus in Chlamydomonas. A genomic DNA library of C. reinhardtii was constructed and screened with a radiolabeled $(AC)_{11}$ probe for the selection of (CA/GT)n repeat clone. Selected clone was seqeuenced, and PCR primer set flanking (CA/GT)n sequence was constructed. PCR was used to specifically amplify the SSR locus from multiple isolates of C. reinhardtii. The locus was polymorphic in some of the C. reinhardtii isolates. However, the locus was amplified only 4 of 6 isolates of C. reinhardtii, not in other 2 isolates of C. reinhardtii, suggesting that this locus is not extensively conserved. A simple Mendelian inheritance pattern was found, which showed 2:2 segregation in the tetrads resulting from a cross between C. reinhardtii and C. smithii. Our results suggest that this simple sequence repeat DNA polymorphism will be useful for identity testing, population studies, linkage analysis, and genome mapping in Chlamydomonas.

Simple sequence repeats (SSR)는 진핵생물체에 널리 산재되어 있으며, 큰 다형현상을 나타내고, polymerase chain reaction (PCR)으로 쉽게 분석된다. 이 연구의 목적은 서로 다른 Chlamydomonas reinhardtii계통간의 다형현상과 Chlamydomonas의 SSR 좌위에서의 유전양상을 결정하는데 있었다. C. reinhardtii의 genomic DNA library를 만들어 $^{32}$P로 라벨링한 (AC)$_{11}$ probe를 이용하여 (CA/GT)n 반복서열을 가지는 clone을 선택하기위해 screen하였다. 선택된 clone을 sequencing하여 (CA/GT)n sequence에 인접한 PCR primer set를 제조하였다. PCR은 여러 C. reinhardtii 계통의 SSR 좌위를 증폭하기 위하여 사용하였다. 그 좌위는 및몇 C. reinhardtii 계통에서 다형현상을 보였다. 그러나 그 좌위에서 C. reinhardtii의 6계통중 4계통만 DNA가 PCR 증폭을 하였고 2계통은 증폭을 하지 않았다. C. reinhardtii와 C. smithii의 교배로 생긴 4배체에서 2:2의 분리비를 보여주었는데, 이는 단순한 멘델의 유전양상을 나타낸다. 이러한 결과로 미루어 SSR 다형현상은 Chlamydomonas의 개체 식별, 개체군 연구, 연쇄 분석, 그리고 유전자 지도 작성을 하는데 유용할 것이다.다.

Keywords

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