Title:The Development of Non-natural Type Nucleoside to Stabilize Triplex
DNA Formation against CG and TA Inversion Site
Volume: 31
Issue: 19
Author(s): Lei Wang*, Yong Ling, Yan Tian, Xiao Wang, Shigeki Sasaki and Yosuke Taniguchi*
Affiliation:
- School of Pharmacy, Nantong University, Nantong, China
- Graduate School of Pharmaceutical Sciences,
Kyushu University, Fukuoka, Japan
Keywords:
Triplex-forming oligonucleotide (TFO), triplex DNA, inversion site, non-natural nucleotide, recognition, antigene strategy, deoxythymidine.
Abstract: Based on the sequence-specific recognition of target duplex DNA by triplexforming
oligonucleotides (TFOs) at the major groove side, the antigene strategy has been
exploited as a gene-targeting tool with considerable attention. Triplex DNA is formed via
the specific base triplets by the Hoogsteen or reverse Hoogsteen hydrogen bond interaction
between TFOs and the homo-purine strand from the target duplex DNA, leading to
the established sequence-specificity. However, the presence of inversion sites, which are
known as non-natural nucleosides that can form satisfactory interactions with 2′-
deoxythymidine (dT) and 2′-deoxycytidine (dC) in TA and CG base pairs in the target
homo-purine DNA sequences, drastically restricts the formation of classically stable base
triplets and even the triplex DNA. Therefore, the design of non-natural type nucleosides,
which can effectively recognize CG or/and TA inversion sites with satisfactory selectivity,
should be of great significance to expanding the triplex-forming sequence. Here, this review
mainly provides a comprehensive review of the current development of novel nonnatural
nucleosides to recognize CG or/and TA inversion sites in triplex DNA formation
against double-strand DNA (dsDNA).