Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Characterization of RAD4 Homologous Gene from Coprinus cinereus

균류 Coprinus cinereus에서 DNA 회복에 관여하는 RAD4 유사유전자의 분리와 특성

  • Choi, In-Soon (Marine-Biotechnology Center for Bio-Functional Material Industries Department of Life Science, Silla University)
  • Published : 2003.08.01
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Abstract

The RAD4 gene of Saccharomyces cerevisiae is essential for the incision step of UV-induced excision repair. A yeast RAD4 gene has been previously isolated by functional complementation. In order to identify the RAD4 homologous gene from fungus Coprinus cinereus, we have constructed cosmid libraries from electrophoretically separated chromosomes of the C. cinereus. The 13 C. cinereus chromosomes were resolved by pulse-field gel electrophoresis, hybridized with S. cerevisiae RAD4 DNA, and then isolated homologous C. cinereus chromosome. The insert DNA of the RAD4 homolog was contained 3.2 kb. Here, we report the characterization of fungus C. cinereus homolog of yeast RAD4 gene. Southern blot analysis confirmed that C. cinereus contains the RAD4 homolog gene and this gene exists as a single copy in C. cinereus genome. When total RNA isolated from C. cinereus cells was hybridized with the 1.2 kb PvuII DNA fragment of the S. cerevisiae RAD4 gene, a 2.5 kb of transcript was detected. In order to investigation whether the increase of transcripts by DNA damaging agent, transcripts levels were examined after treating the cells. The level of transcript did not increase by untraviolet light (UV). This result indicated that the RAD4 homologous gene is not UV inducible gene. Gene deletion experiments indicate that the RAD4 homologous gene is essential for cell viability.

본 연구는 출아형 효모 Saccharomyces cerevisiae에서 자외선의 상해 시 이를 정상으로 회복시키는 절제회복 (excision repair) 유전자로 알려진 RADA4의 특성 규명을 위하여 균류 Coprinus cinereus에서 이와 유사한 유전자를 분리하였다. RAD4 유사 유전자를 분리하기 위하여 균류 C. cinereus의 염색체 DNA를 전기영동하여 분리한 다음 효모 RAD4 DNA를 probe로하여 이와 hybridization하였다. 이 결과 RAD4 유사 유전자는 3.2 kb의 insert DNA를 갖고 있었다. 또한 Southern hybridization으로 이 유사 유전자는 fungus C. cinereus의 염색체에 존재함을 확인하였다. 분리한 RAD4 유사 유전자의 전사체 크기는 2.5 kb 였으며, 자외선의 상해 시 전혀 'inducibility가 없음을 Northern hybridization으로 확인하였다. 또한 유사유전자 부분을 삭제하였을 때 이 부분이 없는 세포는 전혀 생존을 못하였다. 이 결과 분리한 RAD4 유사유전자는 세포의 생존에 관여함을 알 수 있었다.

Keywords

References

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