Sialic acids present on non-reducing terminal of glycan is important for prolonged in vivo half-life of glycoproteins. Many efforts have been made to increase the sialic acid content in the manufacturing of therapeutic glycoproteins because glycoproteins containing non-sialylated glycans do not show effective in vivo efficacies owing to a short half-life. It was reported that knock down of sialidase expression using the RNA interference (RNAi) technology enhanced protein sialylation in CHO cells which are the most widely used for therapeutic glycoprotein production [1]. However, knock down strategy did not completely shut down the sialidase expression. In this study, we performed knockout of sialidase genes in CHO cells by using the CRISPR/Cas9 genome editing technology. Only three sialidases (Neu1, Neu2, and Neu3) were actively expressed in CHO cells when analyzing their expressions using real-time polymerase chain reaction. First, we disrupted Neu3 gene because it is located in the plasma membrane while Neu1 and Neu2 exist in lysosome and cytosol, respectively. After the transfection of vectors expressing Cas9 and sgRNAs, Neu1 gene-disrupted clones were selected by using the T7 endonucleases 1 (T7E1) assay and cell surface sialidase activity assay. Disruption of Neu1 gene did not affect the viability of CHO cells. The disruptions of Neu1 and Neu2 genes in CHO cells are currently in the progress.
저자
Se-Jong Lim [ Synthetic Biology and Bioengineering Research Center, Korean Research Institute of Bioscience & Biotechnology, Biosystems and Bioengineering Program, University of Science and Technology (UST), Daejeon, Korea ]
Keun Koo Shin [ Synthetic Biology and Bioengineering Research Center, Korean Research Institute of Bioscience & Biotechnology, Biosystems and Bioengineering Program, University of Science and Technology (UST), Daejeon, Korea ]
Ohsuk Kwon [ Synthetic Biology and Bioengineering Research Center, Korean Research Institute of Bioscience & Biotechnology, Biosystems and Bioengineering Program, University of Science and Technology (UST), Daejeon, Korea ]
Doo-Byoung Oh [ Synthetic Biology and Bioengineering Research Center, Korean Research Institute of Bioscience & Biotechnology, Biosystems and Bioengineering Program, University of Science and Technology (UST), Daejeon, Korea ]
본 학회는 화학, 생화학, 분자생물학, 미생물학, 식품공학, 의학, 약학, 유전공학 및 생물공학, 환경 및 기타 공업 등 전 분야의 탄수화물관련 이론과 기술을 연구 발전시키고 산학협동을 통해 이를 보급하여 국내 관련 산업의 발전 및 국민생활의 과학화에 기여하고자 하며, 이러한 목표와 비젼의 실현을 위해 회원들이 적극적인 참여와 활동을 전개하고자 한다.