한국발생생물학회지:발생과생식 (Development and Reproduction)

  • 제13권4호
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  • Pages.249-256
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  • 2009
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  • 2465-9525(pISSN)
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  • 2465-9541(eISSN)
한국발생생물학회 (The Korean Society of Developmental Biology)
권호 표지

둥근성게(Strongylocentrotus nudus) Estrogen Receptor-Related Receptor(ERR)의 초기 발생시 유전자 발현 패턴과 전사 활성

Gene Expression Pattern during Early Embryogenesis and Transcriptional Activities of Estrogen Receptor-Related Receptor(ERR) in Sea Urchin, Strongylocentrotus nudus

  • 맹세정 (강릉원주대학교 해양분자생명공학) ;
  • 김미순 (강릉원주대학교 해양분자생명공학) ;
  • 손영창 (강릉원주대학교 해양분자생명공학)
  • Maeng, Se-Jung (Dept. of Marine Molecular Biotechnology, Gangneung-Wonju National University) ;
  • Kim, Mi-Soon (Dept. of Marine Molecular Biotechnology, Gangneung-Wonju National University) ;
  • Sohn, Young-Chang (Dept. of Marine Molecular Biotechnology, Gangneung-Wonju National University)
  • 발행 : 2009.12.31
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초록

구조적으로 estrogen 수용체(estrogen receptor, ER)와 유사한 estrogen receptor-related receptor(ERR)는 포유동물에서 배발생 후기에 외배엽 형성과 관련되어 있다고 알려진 고아핵수용체(orphan nuclear receptor)이다. ERR은 ER과 DNA binding domain의 보존성은 유사하지만, ligand 결합 및 전사 활성은 다르다. 포유동물의 ERR에 관한 연구에 비하여 해양 무척추동물의 ERR에 대한 기능 연구는 매우 부족하다. 본 연구에서는 우리나라 동해안에 주로 서식하는 둥근성게(Strongylocentrotus nudus) ERR의 초기 발생기 유전자 발현 변화와 전사 활성 기능을 조사하기 위해 먼저 polymerase chain reaction(PCR)을 이용하여 cDNA를 동정하였다. 둥근성게 ERR은 S. purpuratus와 91%의 높은 상동성을 보였으며, 계통수 분석을 통해 무척추동물 ERR의 clade에 포함되는 것을 알았다. 둥근성게 배발생 시기에 ERR 유전자 발현을 알아보기 위하여 real-time PCR을 실시한 결과, 4~64세포기와 유생기에 mRNA level이 높은 경향을 나타내었다. 또한 호르몬 및 co-regulator에 의한 둥근성게 ERR의 전사 활성을 조사한 결과, 호르몬에 의한 특이성은 확인되지 않았지만, peroxisome proliferator activated receptor-(PPAR) $\gamma$ coactivator $1\alpha$(PGC-$1\alpha$)가 둥근성게 ERR의 coactivator임을 입증할 수 있었다. 이 연구 결과는 향후 새로운 ligand 발굴과 coregulator와 의 상호작용 연구에 도움이 될 것으로 사료된다.

The estrogen receptor-related receptors (ERRs) are a group of nuclear receptor superfamily of transcription factors. ERRs and estrogen receptors (ERs) have overlapping affinities for coactivators and DNA binding sites, but differ markedly in ligand binding and activation. The three mammalian ERR genes have been implicated in diverse physiological processes ranging from placental development to maintenance of bone density, whereas the molecular diversity, function, and regulation of ERRs in non-mammalian species are not well understood. In the present study, to investigate the involvement of ERR in transcription and embryogenesis in marine invertebrates, a cDNA encoding ERR (SnERR) was cloned from the gonad in Strongylocentrotus nudus, by polymerase chain reaction (PCR). The amino acid sequence of SnERR showed high homology with that of S. purpuratus (91%). A phylogenetic tree clearly showed that SnERR is a member of the ERR family and clustered in echinodermata group as supported by a high bootstrap value. We examined gene expression of SnERR during embryonic development of S. nudus using real-time PCR. During the embryonic development, the mRNA of ERR was significantly high levels in early development stages (4~64 cell) and larval stages. The SnERR slightly activated transcription through the classical estrogen response elements (EREs) in the presence of genistein. In addition, peroxisome proliferator-activated receptor $\gamma$ coactivator (PGC)-$1\alpha$ knwon as a coactivator of ERR enhanced the snERR-mediated transactivation, suggesting that the PGC-$1\alpha$ is a coactivator of SnERR.

키워드

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