共 49 条
Retargeting Sleeping Beauty Transposon Insertions by Engineered Zinc Finger DNA-binding Domains
被引:51
作者:
Voigt, Katrin
[2
]
Gogol-Doering, Andreas
[2
]
Miskey, Csaba
[1
,2
]
Chen, Wei
[2
]
Cathomen, Toni
[3
,4
]
Izsvak, Zsuzsanna
[2
]
Ivics, Zoltan
[1
,2
]
机构:
[1] Paul Ehrlich Inst, Div Med Biotechnol, D-63225 Langen, Germany
[2] Max Delbruck Ctr Mol Med, Berlin, Germany
[3] Hannover Med Sch, Inst Expt Hematol, D-3000 Hannover, Germany
[4] Univ Med Ctr Freiburg, Dept Transfus Med, Freiburg, Germany
关键词:
TARGET SITE SELECTION;
HUMAN-CELLS;
GENE-THERAPY;
DIRECTED INTEGRATION;
FUSION PROTEINS;
HUMAN GENOME;
VIRAL-DNA;
IN-VITRO;
NUCLEASES;
RETROTRANSPOSON;
D O I:
10.1038/mt.2012.126
中图分类号:
Q81 [生物工程学(生物技术)];
Q93 [微生物学];
学科分类号:
071005 ;
0836 ;
090102 ;
100705 ;
摘要:
The Sleeping Beauty (SB) transposon is a nonviral, integrating vector system with proven efficacy in preclinical animal models, and thus holds promise for future clinical applications. However, SB has a close-to-random insertion profile that could lead to genotoxic effects, thereby presenting a potential safety issue. We evaluated zinc finger (ZF) DNA-binding domains (DBDs) for their abilities to introduce a bias into SB's insertion profile. E2C, that binds a unique site in the erbB-2 gene, mediated locus-specific transposon insertions at low frequencies. A novel ZF targeting LINE1 repeats, ZF-B, showed specific binding to an 18-bp site represented by similar to 12,000 copies in the human genome. We mapped SB insertions using linear-amplification (LAM)-PCR and Illumina sequencing. Targeted insertions with ZF-B peaked at approximately fourfold enrichment of transposition around ZF-B binding sites yielding similar to 45% overall frequency of insertion into LINE1. A decrease in the ZF-B dataset with respect to transposon insertions in genes was found, suggesting that LINE1 repeats act as a sponge that "soak up" a fraction of SB insertions and thereby redirect them away from genes. Improvements in ZF technology and a careful choice of targeted genomic regions may improve the safety profile of SB for future clinical applications.
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页码:1852 / 1862
页数:11
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