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Triple-stranded DNA

AuthorsBernués, Jordi ; Azorín, Ferran
Issue Date1995
CitationNucleic Acids and Molecular Biology (9): 1-21 (1995)
SeriesNucleic Acids and Molecular Biology
AbstractThe molecular biology of DNA is determined to a great extent by the chemical properties of its constitutive polynucleotide chains and, in particular, by the stability of the different complexes to which they can give rise. Most frequently, DNA is found in the form of an antiparallel doublestranded association but the formation of DNA complexes containing either three or four strands has also been extensively reported in the literature. The formation of a triple-stranded nucleic acid was first reported in 1957 in the case of the RNA triplex U(A · U) (Felsenfeld et al. 1957) and it was followed by the demonstration that the RNA homopolymers polyI and polyA could also form the triple-stranded helixes I(I · I) and I(A · I) (Rich 1958a,b). In the following decade, formation of triple-stranded conformations was also demonstrated for a variety of RNA and DNA homopolymers, as well as for RNA-DNA hybrids. Recently, triple-stranded DNA has received renewed attention. Most of the recent interest in triple-stranded DNA came after the discovery that DNA triplexes could also be intramolecular. In the case of an intramolecular triplex, the third strand, which associates to the double-stranded DNA fragment, is donated by the same DNA molecule. Intramolecular triplexes are therefore a source of DNA structural polymorphism, which adds to the known capability of the DNA molecule to exist under structurally different double-stranded conformations. On the other hand, in the case of an intermolecular triplex, the third strand is donated by a different DNA or RNA molecule, normally a singlestranded oligomer. Intermolecular triplexes provide a means for the specific recognition of double-stranded DNA by single-stranded DNA or RNA molecules. Here, after a brief introductory summary about the general aspects underlying the formation of triple-stranded DNA, we will review the recent progress on the study of the structural and functional properties of intra- and intermolecular DNA triplexes
DescriptionCapítulo en: Fritz Eckstein; David M. J. Lilley (eds.). Nucleic Acids and Molecular Biology. Berlin: Springer, 1995, p.1-21. (Nucleic Acids and Molecular Biology ; 9)
Publisher version (URL)http://dx.doi.org/10.1007/978-3-642-79488-9_1
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