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The structure of complexes made from DNA and suitable lipids (lipoplex, Lx) was examined by cryo-electron microscopy (cryoEM). We observed a distinct concentric ring-like pattern with striated shells when using plasmid DNA. These spherical multilamellar particles have a mean diameter of 254 nm with repetitive spacing of 7.5 nm with striation of 5.3 nm(More)
G,A-containing purine oligonucleotides of various lengths form extremely stable and specific triplexes with the purine-pyrimidine stretch of the vpx gene [Svinarchuk,F., Monnot,M., Merle,A., Malvy,C. and Fermandjian,S. (1995) Nucleic Acids Res., 22, 3742--3747]. The potential application of triple-helix-forming oligonucleotides (TFO) in gene-targeted(More)
In this work we selected double-stranded DNA sequences capable of forming stable triplexes at 20 or 50 degrees C with corresponding 13mer purine oligonucleotides. This selection was obtained by a double aptamer approach where both the starting sequences of the oligonucleotides and the target DNA duplex were random. The results of selection were confirmed by(More)
In a previous work we showed that a short triple helix-forming oligonucleotide (TFO) targeted to the murine c-pim-1 proto-oncogene promoter gives a very stable triple helix under physiological conditions in vitro . Moreover, this triplex was stable inside cells when preformed in vitro . However, we failed to detect triplex formation for this sequence inside(More)
In our previous work we have shown that the oligonucleotide 5'-GGGGAGGGGGAGG-3' gives a very stable and specific triplex with the promoter of the murine c-pim-1 proto-oncogene in vitro[Svinarchuk, F., Bertrand, J.-R. and Malvy, C.(1994)Nucleic Acids Res., 22, 3742-3747]. In the present work, we have tested triplex formation with some derivatives of this(More)
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