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• W2045882072 abstract "In the recent genomic era, a novel gene silencing approach has been introduced based on the use of small synthetic oligonucleotides, such as antisense RNAs, siRNAs, to inhibit the expression of a specific target gene. Successful implementation of this methodology calls for the development of efficient systems to deliver small oligonucleotides into the cells using various natural and synthetic cationic agents. While extensive studies have focused on the interaction of various natural and synthetic cationic surfactants with long DNA, less attention has been paid to surfactant interaction with small oligonuclotides. In this study, the interaction between 14mer double stranded DNA and alkyltrimethylammonium bromides of C16 (cetyl, CTAB), C14 (tetradecyl, TTAB), and C12 (dodecyl, DTAB) chain lengths was investigated at different charge ratios by gel electrophoresis, ethidium bromide exclusion, circular dichroism, and UV melting. Our gel studies at 1 μM oligonucleotide concentration showed that CTAB, TTAB, and DTAB neutralize the oligonucleotides at a charge ratio (Z±) of 1, 14, and 50, respectively. At lower charge ratios, CTAB and TTAB interact with oligonucleotides, and the complexes show electrophoretic mobility shifts in the gel, while such mobility shifts were completely absent in the case of DTAB. UV melting experiments revealed that interaction with all three surfactants increased the thermostability of the oligonucleotide. The extent of thermal stabilization was highest in the case of CTAB, moderate in the case of TTAB, and extremely low in the case of DTAB. Oligonucleotides within fully neutralized complexes denatured at further higher temperatures, and again, stabilization was the highest in the case of CTAB followed by TTAB and DTAB, hence revealing that the oligonucleotides interacted more strongly with CTAB than with the other two surfactants. Ethidium bromide exclusion studies also supported our UV melting studies, confirming that CTAB binds most strongly to the oligonucleotide. CD titrations of oligonucleotides with increasing amounts of surfactants revealed common spectral patterns consisting of the progressive loss of CD signals for native helical DNA conformations. Overall, our results demonstrate that interaction between oligonucleotides and cationic surfactants, although qualitatively similar to long double stranded DNA, shows subtle differences that need to be understood to improve small oligonucleotide delivery into the cells by using common delivery agents that have been used to deliver long pieces of DNA." @default.
• W2045882072 created "2016-06-24" @default.
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• W2045882072 date "2008-06-27" @default.
• W2045882072 modified "2023-09-23" @default.
• W2045882072 title "Interaction Between 14mer DNA Oligonucleotide and Cationic Surfactants of Various Chain Lengths" @default.
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• W2045882072 doi "https://doi.org/10.1021/jp8017452" @default.
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