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RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...

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Related Experiment Video

Updated: Jun 22, 2026

Structural Information from Single-molecule FRET Experiments Using the Fast Nano-positioning System
12:30

Structural Information from Single-molecule FRET Experiments Using the Fast Nano-positioning System

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Nano-DMS-MaP allows isoform-specific RNA structure determination.

Patrick Bohn1, Anne-Sophie Gribling-Burrer1, Uddhav B Ambi1

  • 1Helmholtz Institute for RNA-based Infection Research, Helmholtz Centre for Infection Research, Würzburg, Germany.

Nature Methods
|April 27, 2023
PubMed
Summary
This summary is machine-generated.

New nanopore sequencing technology (Nano-DMS-MaP) reveals distinct RNA structures in individual human immunodeficiency virus-1 transcripts. This method overcomes limitations of short-read sequencing for understanding complex RNA structures.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Virology

Background:

  • RNA structure influences biological function.
  • Current methods using short-read sequencing provide population-averaged RNA structure data, obscuring transcript-specific details.
  • Resolving isoform-specific RNA structures is crucial for understanding gene regulation and viral biology.

Purpose of the Study:

  • To develop a method for obtaining isoform-resolved RNA structural information.
  • To apply this method to study the structure of human immunodeficiency virus-1 (HIV-1) transcripts.
  • To investigate the structural differences between spliced and unspliced HIV-1 RNAs.

Main Methods:

  • Nanopore dimethylsulfate mutational profiling (Nano-DMS-MaP) utilizes long-read sequencing.
  • The method maps dimethyl sulfate adducts, which form on unpaired RNA bases.
  • Analysis of long reads allows for the resolution of RNA structure at the isoform level.

Main Results:

  • Nano-DMS-MaP successfully resolved complex RNA structures in HIV-1 transcripts within infected cells.
  • Distinct RNA structures were identified between unspliced and spliced HIV-1 transcripts at the packaging site.
  • These structural differences in the 5' untranslated region likely explain the differential packaging of viral RNAs.

Conclusions:

  • Nano-DMS-MaP is an effective method for obtaining transcript-specific RNA structural information.
  • The method overcomes the limitations of previous short-read ensemble analyses.
  • Understanding isoform-specific RNA structures can reveal critical biological insights, such as mechanisms of viral RNA packaging.