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    • 2. 发明申请
    • SELF-DELETING VECTORS FOR GENE THERAPY
    • 用于基因治疗的自我删除载体
    • WO1997007223A1
    • 1997-02-27
    • PCT/EP1996000761
    • 1996-02-23
    • VON MELCHNER, HaraldRUSS, Andreas, PeterGREZ, Manuel
    • C12N15/86
    • C12N15/86A61K48/00C12N2740/13043
    • The invention involves the development of vectors for somatic gene therapy. The vectors transduce a complete transcriptional unit containing a promoter, a protein coding sequence and a polyadenylation sequence into the genome of mammalian cells. Upon integration, the vectors delete most viral and non-viral sequences unrelated to transcriptional unit thus avoiding common problems encountered with conventional retrovirus vectors such as repression of gene expression by transcriptional silencing, mobilization of endogenous retroviruses, activation of oncogenes or development of an immune response. The invention exploits (i) the natural life cycle of retroviruses, involving duplication of the terminal control regions U5 and U3 to generate long terminal repeats (LTR) and (ii) the ability of site specific recombinases to excise any sequences positioned between two specific target sequences from the mammalian genome. Thus, the retroviruses of the invention transduce the coding sequences of a site specific recombinase and at least one recombinase-specific target sequence into the genome along with the transcriptional unit expressing a therapy gene.
    • 本发明涉及体细胞基因治疗载体的开发。 载体将含有启动子,蛋白质编码序列和多聚腺苷酸化序列的完整转录单位转导到哺乳动物细胞的基因组中。 在整合时,载体删除与转录单位无关的大多数病毒和非病毒序列,从而避免常规逆转录病毒载体遇到的常见问题,例如通过转录沉默抑制基因表达,动员内源性逆转录病毒,致癌基因的活化或发展免疫应答 。 本发明利用(i)逆转录病毒的自然生命周期,涉及终端控制区域U5和U3的复制以产生长末端重复序列(LTR)和(ii)位点特异性重组酶能够切除位于两个特异性靶标 来自哺乳动物基因组的序列。 因此,本发明的逆转录病毒与表达治疗基因的转录单位一起将位点特异性重组酶和至少一种重组酶特异性靶序列的编码序列转导入基因组。