摘要:
The present invention relates to improved retroviral vectors for gene therapy. In this invention, retroviral vectors with higher safety and efficiency are constructed from MLV-based starting vectors, MON and MIN. The improved vectors have the following features: 1) sequences corresponding to MLV-derived pol gene are completely deleted in the vectors, avoiding homologous recombination which has been a baffling problem in conventional retroviral vectors, 2) a heterologous intron, splicing acceptor and/or non-coding sequence are/is inserted into the upstream position of a cloning site, maximizing the expression of a foreign gene through efficient splicing, 3) the vectors contain either the full-length U3 sequence of 5′ LTR or a strong heterologous promoter instead, permitting the abundant production of RNA, 4) either IRES (Internal Ribosomal Entry Site) or internal SV40 minimal promoter is inserted into the downstream position of cloning site, enabling the simultaneous expression of two or more foreign genes. Since the improved retroviral vectors of this invention turn out to be safe and to express the foreign gene efficiently, they are useful for gene therapy and the like.
摘要:
Provided are an expression vector for an animal cell including a promoter, a cloning site or a polynucleotide encoding foreign product, and a transcription terminator, all of which are operably connected each other within the expression vector, in which at least one copy of human β-globin MAR sequence is attached to the 3′ terminal of the transcription terminator, and a method of expressing a foreign gene using the expression vector.
摘要:
Provided are an expression vector for an animal cell including a promoter, a cloning site or a polynucleotide encoding foreign product, and a transcription terminator, all of which are operably connected each other within the expression vector, in which at least one copy of human β-globin MAR sequence is attached to the 31 terminal of the transcription terminator, and a method of expressing a foreign gene using the expression vector.