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- Title
Human telomeric DNA: G-quadruplex, i-motif and Watson-Crick double helix.
- Authors
Phan, Anh Tuân; Mergny, Jean-Louis
- Abstract
Human telomeric DNA composed of (TTAGGG/CCCTAA)n repeats may form a classical Watson-Crick double helix. Each individual strand is also prone to quadruplex formation: the G-rich strand may adopt a G-quadruplex conformation involving G-quartets whereas the C-rich strand may fold into an i-motif based on intercalated C*C+ base pairs. Using an equimolar mixture of the telomeric oligonucleotides d[AGGG(TTAGGG)3] and d[(CCCTAA)3CCCT], we defined which structures existed and which would be the predominant species under a variety of experimental conditions. Under near-physiological conditions of pH, temperature and salt concentration, telomeric DNA was predominantly in a double-helix form. However, at lower pH values or higher temperatures, the G-quadruplex and/or the i-motif efficiently competed with the duplex. We also present kinetic and thermodynamic data for duplex association and for G-quadruplex/i-motif unfolding.
- Publication
Nucleic acids research, 2002, Vol 30, Issue 21, p4618
- ISSN
1362-4962
- Publication type
Journal Article
- DOI
10.1093/nar/gkf597