Simultaneous Non-invasive Analysis of DNA Condensation and Stability by Two-step QD-FRET.
Simultaneous Non-invasive Analysis of DNA Condensation and Stability by Two-step QD-FRET.
复制标题
通过两步QD-Fret对DNA凝结和稳定性的同时非侵入性分析。
DOI:
10.1016/j.nantod.2009.02.008
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发表时间:
2009-04-01
期刊:
影响因子:
17.4
通讯作者:
Leong KW
中科院分区:
文献类型:
--
作者:
Chen HH;Ho YP;Jiang X;Mao HQ;Wang TH;Leong KW
Nanoscale vectors comprised of cationic polymers that condense DNA to form nanocomplexes are promising options for gene transfer. The rational design of more efficient nonviral gene carriers will be possible only with better mechanistic understanding of the critical rate-limiting steps, such as nanocomplex unpacking to release DNA and degradation by nucleases. We present a two-step quantum dot fluorescence resonance energy transfer (two-step QD-FRET) approach to simultaneously and non-invasively analyze DNA condensation and stability. Plasmid DNA, double-labeled with QD (525 nm emission) and nucleic acid dyes, were complexed with Cy5-labeled cationic gene carriers. The QD donor drives energy transfer stepwise through the intermediate nucleic acid dye to the final acceptor Cy5. At least three distinct states of DNA condensation and integrity were distinguished in single particle manner and within cells by quantitative ratiometric analysis of energy transfer efficiencies. This novel two-step QD-FRET method allows for more detailed assessment of the onset of DNA release and degradation simultaneously.
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影响因子:
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通讯作者:
De Smedt, Stefaan C.
影响因子:
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