NT3基因的克隆、鉴定及高表达胚胎干细胞的构建与筛选

目的从小鼠肝脏组织中克隆神经营养因子NT3基因,在此基础上构建能稳定表达NT3的MESPU35细胞株.方法RT-PCR扩增目的基因,克隆入穿梭载体pExchange-1neo,酶切及测序鉴定.重组载体转染MESPU35胚胎干细胞株,G418长期筛选,RT-PCR检测转染细胞NT3水平.结果RT-PCR得到长度为777bp的基因片段,克隆后酶切鉴定正确,测序结果经BLAST对比,与GenBank中小鼠NT-3序列完全一致.成功构建了NT3真核表达载体及高表达细胞株.结论从小鼠肝脏组织中PCR克隆了正确的NT3基因,所获得的NT3稳定表达MESPU35-NT3细胞株为后续相关实验提供了保证.

Cloning and identification of normal mouse NT3 gene and the establishment and screening of cell strain expressing high level of NT3 gene

Objective To clone and identify neurotrophic factor NT3 gene from mouse liver so as to establish a cell strain expressing high level of NT3 gene. Methods The target genes amplified by RT PCR were cloned into the shuttle vector pExchange 1neo, and then the DNA sequence was analyzed by enzyme digestion and sequencing. The recombinant expression vector pExchange NT3 1neo was employed to transfect the embryonic stem cell strain MESPU35, and then the transfected cells were selected by G418. The NT3 level in the transfected cells was detected by RT PCR. Results A gene fragment of 777 bp was obtained by RT PCR, and the DNA sequence was identical to mice NT 3 gene sequence of GenBank. The recombinant vector was constructed successfully and the constructed cell strain could express high level of NT 3 gene. Conclusion The successful cloning of NT3 gene from mouse liver, construction of pExchange NT3 1neo expression vector, and establishment of cell strain stably expressing high level of NT3 gene have laid a foundation for the further studies.