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    The effect of DNA topology on transfection efficiency of mammalian cells has been widely tested on plasmids smaller than 10 kb, but little is known for larger DNA vectors carrying intact genomic DNA containing introns, exons, and regulatory regions. Here, we demonstrate that circular BACs transfect more efficiently than covalently closed linear BACs. We found up to 3.1- and 8.9- fold higher eGFP expression from circular 11 kb and 100 kb BACs, respectively, compared to linear BACs. These findings provide insights for improved vector development for gene delivery and expression studies of large intact transgenes in mammalian cells. Copyright © 2021 Elsevier Inc. All rights reserved.


    Yin Cheng Wong, Andrew Osahor, Farooq Omar Maan Al-Ajli, Kumaran Narayanan. Large BACs transfect more efficiently in circular topology. Analytical biochemistry. 2021 Oct 01;630:114324

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    PMID: 34363787

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