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Three's a crowd - stabilisation, structure, and applications of DNA triplexes.

Maria Dalla Pozza1, Ahmad Abdullrahman2, Christine J Cardin3

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DNA triple helix structures can form naturally or be synthesized using triplex-forming oligonucleotides (TFOs). This review explores TFOs for therapeutic applications, focusing on stability, modification, and integrating photophysical payloads like ruthenium complexes.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Medicinal Chemistry

Background:

  • DNA exhibits flexibility, forming secondary structures like the triple helix.
  • DNA triplexes occur naturally (e.g., homologous recombination) or can be engineered using synthetic triplex-forming oligonucleotides (TFOs).
  • Sequence-specific binding of TFOs to DNA duplexes offers potential for targeted therapeutic strategies.

Purpose of the Study:

  • To review the structure and chemical modification of DNA triplexes.
  • To explore the use of TFOs as delivery vehicles for DNA-modifying compounds.
  • To discuss the integration of photophysical payloads, such as ruthenium polypyridyl complexes, with TFO systems.

Main Methods:

  • Review of existing literature on DNA triplex formation and stability.
  • Analysis of chemical modification strategies for enhancing triplex stability and in vivo performance.
  • Examination of ruthenium polypyridyl complexes as functional payloads for TFOs.

Main Results:

  • DNA triplexes can be stabilized and functionalized through specific chemical modifications.
  • Ruthenium polypyridyl complexes show promise as luminescent probes and DNA-damaging agents when conjugated to TFOs.
  • Understanding triplex structure is crucial for developing effective TFO-based therapeutic systems.

Conclusions:

  • DNA triplexes represent a versatile platform for targeted drug delivery and diagnostics.
  • Further research into TFO chemical modifications and payload integration is essential for clinical translation.
  • The combination of TFOs with photophysical agents offers novel avenues for DNA-targeted therapies.