NDLI: Site-directed recombination via bifunctional PNA-DNA conjugates.

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Site-directed recombination via bifunctional PNA-DNA conjugates.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Glazer, Peter M. Egholm, Michael Vasquez, Karen M. Rogers, Faye A.
Description	Author Affiliation: Rogers FA ( Departments of Therapeutic Radiology and Genetics, Yale University School of Medicine, New Haven, CT 06520, USA.);
Abstract	Site-specific DNA binding molecules offer the potential for genetic manipulation of mammalian cells. Peptide nucleic acids (PNAs) are a DNA mimic in which the purine and pyrimidine bases are attached to a polyamide backbone. PNAs bind with high affinity to single-stranded DNA via Watson-Crick base pairing and can form triple helices via Hoogsteen binding to DNAPNA duplexes. Dimeric bis-PNAs capable of both strand invasion and triplex formation can form clamp structures on target DNAs. As a strategy to promote site-directed recombination, a bis-PNA was coupled to a 40-nt donor DNA fragment homologous to an adjacent region in the target gene. The PNA-DNA conjugate was found to mediate site-directed recombination with a plasmid substrate in human cell-free extracts, resulting in correction of a mutation in a reporter gene at a frequency at least 60-fold above background. Induced site-specific recombination was also seen when the bis-PNA and the donor DNA were co-mixed without covalent linkage. In addition, the bis-PNA and the bis-PNA-DNA conjugate were found to induce DNA repair specifically in the target plasmid. Both the PNA-induced recombination and the PNA-induced repair were found to be dependent on the nucleotide excision repair factor, XPA (xeroderma pigmentosum complementation group A protein). These results suggest that the formation of a PNA clamp on duplex DNA creates a helical distortion that strongly provokes DNA repair and thereby sensitizes the target site to recombination. The ability to promote recombination in a site-directed manner using PNA-DNA conjugates may provide a useful strategy to achieve targeted correction of defective genes.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	26
Volume Number	99
Language	English
Publisher	National Academy of Sciences
Publisher Date	2002-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	DNA Repair DNA Metabolism Recombination, Genetic Genetics DNA-Binding Proteins Physiology HeLa Cells Peptide Nucleic Acids Xeroderma Pigmentosum Group A Protein Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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