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Related Experiment Video

Updated: Jun 12, 2025

Identification of RNAs Engaged in Direct RNA-RNA Interaction with a Long Non-Coding RNA
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Measuring intramolecular connectivity in long RNA molecules using two-dimensional DNA patch-probe arrays.

Timothy K Chiang1, Ofer Kimchi2, Herman K Dhaliwal3

  • 1Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States.

Nucleic Acids Research
|June 6, 2025
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Summary
This summary is machine-generated.

This study introduces a DNA patch-probe method to map RNA connections without folding models. The technique reveals coexisting RNA structures and how modifications like pseudouridine affect connectivity.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genomics

Background:

  • RNA molecules adopt complex three-dimensional structures crucial for their function.
  • Understanding RNA intramolecular connections is vital for deciphering RNA structure-function relationships.
  • Existing methods often rely on computational folding models, which may not capture the full complexity of RNA conformations in solution.

Purpose of the Study:

  • To develop and validate a novel DNA-array-based method for inferring RNA intramolecular connections and their prevalences.
  • To investigate the coexistence of multiple RNA structures in solution.
  • To examine the impact of RNA modifications and strand types on RNA connectivity.

Main Methods:

  • A DNA-array-based patch-probe technique was employed to perturb and map RNA connections.
  • DNA oligonucleotide "patches" were used to disrupt specific RNA interactions.
  • Microarrays with DNA oligonucleotide "probes" recorded perturbation patterns to infer connectivity.

Main Results:

  • The patch-probe method successfully inferred intramolecular connections in satellite tobacco mosaic virus (STMV) RNA without prior folding models.
  • Results revealed long-range connections consistent with known structures and identified competing connections, suggesting multiple coexisting RNA structures.
  • The study demonstrated that pseudouridine substitution and strand type (plus vs. minus) significantly alter RNA connectivity.
  • A simplified version validated a predicted connection in bacteriophage MS2 RNA.

Conclusions:

  • The DNA patch-probe method provides a powerful, model-free approach to map RNA connectivity and prevalence in solution.
  • Multiple RNA structures with distinct connectivity patterns can coexist, offering insights into RNA dynamics.
  • RNA modifications and strand polarity play critical roles in shaping RNA structural ensembles.