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MicroRNAs01:22

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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Resolving Subcellular miRNA Trafficking and Turnover at Single-Molecule Resolution.

Sethuramasundaram Pitchiaya1, Laurie A Heinicke1, Jun I Park1

  • 1Single Molecule Analysis Group, Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA.

Cell Reports
|April 20, 2017
PubMed
Summary

RNA targets protect microRNAs (miRNAs) from degradation, influencing their cellular location and activity. Argonaute protein identity is key for miRNA strand selection and nuclear retention, impacting gene silencing surveillance.

Keywords:
Argonauteanti-miRscorrelative counting analysismRNA targetsmicroRNAsingle-molecule microscopy

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • MicroRNA (miRNA) regulation is crucial for gene silencing in both cytoplasm and nucleus.
  • Understanding miRNA localization, stability, and activity is essential for their biological roles.

Purpose of the Study:

  • To develop tools for assessing miRNA subcellular trafficking, integrity, and activity at the single-molecule level.
  • To investigate the impact of RNA targets and Argonaute proteins on miRNA fate and function.

Main Methods:

  • Development of single-molecule fluorescence-based tools.
  • Analysis of miRNA trafficking, integrity, and activity within single cells.
  • Assessment of molecular complex formation and size.

Main Results:

  • Seed-matched RNA targets protect miRNAs from degradation and promote nuclear retention.
  • Functional cytoplasmic miRNAs are in high-molecular-weight complexes; nuclear or anti-miRNA targeted miRNAs are in lower-molecular-weight, inactive complexes.
  • Argonaute protein abundance affects miRNA stability and activity, while Argonaute identity influences strand selection, unwinding, and nuclear retention.

Conclusions:

  • miRNA degradation and Argonaute loading/target binding dynamics control subcellular miRNA levels for gene silencing.
  • Single-cell analysis of miRNA activity, trafficking, and metabolism can aid in developing miRNA-based therapeutics.