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    • 10. 发明申请
    • MAMMALIAN EXPRESSION SYSTEM
    • MAMMALIAN表达系统
    • WO2017032834A1
    • 2017-03-02
    • PCT/EP2016/070083
    • 2016-08-25
    • LONZA BIOLOGICS PLC.
    • YOUNG, RobertBUDGE, James D.SMALES, C. Mark
    • C12N15/85C12N15/67
    • C12N15/67C12N15/85C12N2800/108C12N2800/40
    • The present invention relates to an expression system for the heterologous expression of a nucleic acid sequence of interest in a mammalian cell, the system comprising: (i) a first genetic entity, comprising: a nucleic acid sequence encoding a functional Epstein Barr virus nuclear antigen 1 (EBNA-1), the nucleic acid sequence being operably linked to regulatory elements that allow for expression of the nucleic acid sequence encoding a functional EBNA-1; (ii) a second genetic entity, comprising: a nucleic acid sequence encoding a functional nucleoside diphosphate kinase A (NDPK-A), the nucleic acid sequence being operably linked to regulatory elements that allow for expression of the nucleic acid sequence encoding a functional NDPK-A; (iii) a third genetic entity, comprising: the nucleic acid sequence of interest being operably linked to regulatory elements that allow for expression of the nucleic acid sequence of interest; and (iv) a four genetic entity, comprising: the Epstein Barr virus OriP sequence or one or more subsequences thereof, wherein the one or more subsequences comprise at least the 'Family of Repeats' DNA-binding site for EBNA-1 and the 'Dyad Symmetry' DNA-binding site for EBNA-1. The present invention also relates to corresponding mammalian host cells and methods for expressing a nucleic acid sequence of interest by means of such expression system.
    • 本发明涉及用于在哺乳动物细胞中异源表达感兴趣的核酸序列的表达系统,所述系统包含:(i)第一遗传实体,其包含:编码功能性爱泼斯坦巴尔病毒核抗原的核酸序列 1(EBNA-1),所述核酸序列可操作地连接到允许表达编码功能性EBNA-1的核酸序列的调节元件; (ii)第二遗传实体,其包含:编码功能性核苷二磷酸激酶A(NDPK-A)的核酸序列,所述核酸序列可操作地连接于允许表达编码功能性NDPK的核酸序列的调节元件 -一个; (iii)第三遗传实体,其包含:感兴趣的核酸序列可操作地连接到允许表达感兴趣的核酸序列的调节元件; 其包含:爱泼斯坦巴尔病毒OriP序列或其一个或多个子序列,其中所述一个或多个亚序列至少包含EBNA-1的“重复家族DNA”结合位点和“ Dyad Symmetry'DNA结合位点用于EBNA-1。 本发明还涉及相应的哺乳动物宿主细胞和通过这种表达系统表达感兴趣的核酸序列的方法。