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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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RNA•DNA:DNA Triplex Formation Modulates Individual Base Pair Stabilities in the DNA Target Duplex.

Nina M Krause1, Julia Wirmer-Bartoschek1, Christian Richter1

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Summary
This summary is machine-generated.

Long non-coding RNAs (lncRNAs) can regulate genes by forming RNA•DNA:DNA triplexes. This study quantifies how lncRNA binding affects DNA duplex stability, revealing insights into triplex stability and gene regulation mechanisms.

Keywords:
NMR spectroscopyRNA•DNA:DNA triplexbase pair stabilities

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Long non-coding RNAs (lncRNAs) are crucial regulators of gene expression.
  • RNA•DNA:DNA triplexes represent a significant mechanism for lncRNA-mediated gene regulation.
  • These triplexes form when lncRNAs bind to DNA major grooves via Hoogsteen base pairing.

Purpose of the Study:

  • To investigate the impact of RNA binding on DNA duplex stability at base pair resolution.
  • To gain insights into the thermodynamic stability of RNA•DNA:DNA triplexes.
  • To analyze the specific lncRNA HIF1α-AS1 and its DNA target ADM, relevant to cardiovascular diseases.

Main Methods:

  • Quantification of temperature-dependent imino hydrogen exchange with solvent in the DNA duplex.
  • Determination of individual DNA duplex base pair stability changes upon triplex formation.
  • Investigation of an antiparallel triplex formed between HIF1α-AS1 and ADM DNA.

Main Results:

  • Triplex formation significantly alters DNA duplex structure and stability.
  • Changes in stability are attributed to modifications in hydrogen bonding strength and nucleobase-stacking interactions.
  • Thermodynamic data provides base-pair resolution insights into triplex stability.

Conclusions:

  • RNA•DNA:DNA triplex formation impacts DNA stability through altered base pairing and stacking.
  • These findings support the development of bioinformatic tools for predicting triplex stability.
  • Enhanced understanding of triplex formation contributes to knowledge of lncRNA gene regulation.