Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Re-Engineering of Carcinoembryonic Antigen RNA with the Group I Intron of Tetrahymena thermophila by Targeted Trans-Splicing

  • JUNG HEUNG-SU (Department of Molecular Biology, Institute of Nanosensor and Biotechnology, Dankook University) ;
  • LEE SEONG-WOOK (Department of Molecular Biology, Institute of Nanosensor and Biotechnology, Dankook University)
  • Published : 2005.12.01
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Abstract

Elevated expression of carcinoembryonic antigen (CEA) has been implicated in various biological aspects of neoplasia such as tumor cell adhesion, metastasis, blocking of cellular immune mechanisms, and antiapoptosis function. Thus, the CEA could be an important target for anticancer therapy. In this study, we developed Tetrahymena group 1 intron-based trans-splicing ribozymes that can specifically target and replace CEA RNA. To this end, we first determined which regions of the CEA RNA were accessible to ribozymes by employing an RNA mapping strategy that was based on a trans-splicing ribozyme library. Next, we assessed the ribozyme activities by comparing the trans-splicing activities of several ribozymes that targeted different regions of the CEA RNA, and then the ribozyme that could target the most accessible site was observed to be the most active with high fidelity in vitro. Moreover, the specific trans-splicing ribozyme was found to react with and altered the target CEA transcripts in mammalian cells with high fidelity. These results suggest that the Tetrahymena ribozyme can be utilized to replace CEA RNAs in tumors with a new RNA-harboring anticancer activity, thereby hopefully reverting the malignant phenotype.

Keywords

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