Abstract
We have assembled two BAC vectors containing a single fragment spanning the entire CFTR locus and including the upstream and downstream regions. The two vectors differ in size of the upstream region, and were recovered in Escherichia coli, with intact BAC DNAs prepared for structural and functional analyses. Sequence analysis allowed precise mapping of the inserts. We show that the CFTR gene was wild type and is categorized as the most frequent haplotype in Caucasian populations, identified by the following polymorphisms: (GATT)7 in intron 6a; (TG)11T7 in intron 8; V470 at position 470. CFTR expression and activity were analyzed in model cells by RT-PCR, quantitative real-time PCR, western blotting, indirect immunofluorescence and electrophysiological methods, which show the presence of an active CFTR Cl − channel. Finally, and supporting the hypothesis that CFTR functions as a receptor for Pseudomonas aeruginosa, we show that CFTR-expressing cells internalized more bacteria than parental cells that do not express CFTR. Overall, these data demonstrate that the BAC vectors contain a functional CFTR fragment and have unique features, including derivation from a single fragment, availability of a detailed genomic map and the possibility to use standard extraction procedures for BAC DNA preparations.
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Acknowledgements
We thank MD Amaral (Lisboa Portugal) and P Del Porto (Rome, Italy) for help with the western blotting, J Riordan, (North Carolina, USA) for the anti-CFTR antibody and Lucia Rocchi for helpful discussion. This work was supported by the European Community (contract no. QLK3-CT-2002-02119) and partially by ‘Fondazione italiana per la ricerca sulla fibrosi cistica’ and the Istituto Pasteur-Fondazione Cenci Bolognetti, Università di Roma ‘La Sapienza’. The Fellowship to CA was supported by Centro Regionale FC, Lazio.
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Auriche, C., Di Domenico, E., Pierandrei, S. et al. CFTR expression and activity from the human CFTR locus in BAC vectors, with regulatory regions, isolated by a single-step procedure. Gene Ther 17, 1341–1354 (2010). https://doi.org/10.1038/gt.2010.89
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DOI: https://doi.org/10.1038/gt.2010.89