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A Method for Expressing and Imaging Abundant, Stable, Circular RNAs In Vivo Using tRNA Splicing.

C A Schmidt1, J J Noto1, G S Filonov2

  • 1Integrative Program for Biological and Genome Sciences, Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC, United States.

Methods in Enzymology
|June 1, 2016
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Summary
This summary is machine-generated.

Researchers discovered a novel method for creating circular RNAs (circRNAs) using tRNA introns. This ancient mechanism bypasses traditional mRNA splicing, enabling stable circRNA production in various animal cells.

Keywords:
BroccoliCircular RNAFluorescent RNA aptamerIn-gel imagingLive-cell imagingRNA imagingtRNA splicingtricRNA

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Circular RNAs (circRNAs) are prevalent in animal cells and differ from linear RNAs.
  • CircRNAs resist degradation due to their lack of free ends.
  • Traditional circRNA production relies on engineered pre-mRNAs and back-splicing.

Purpose of the Study:

  • To present an orthogonal method for generating circRNAs in vivo.
  • To detail a mechanism utilizing tRNA intron splicing for circRNA production.
  • To characterize the expression and properties of these novel circRNAs.

Main Methods:

  • Utilized splicing of intron-containing tRNAs to produce circRNAs.
  • Employed fluorescence-based RNA reporters for analysis.
  • Investigated circRNA expression, localization, and stability in metazoan cells.

Main Results:

  • Demonstrated a conserved, ancient mechanism of RNA circularization via tRNA introns.
  • Established an orthogonal method for circRNA synthesis independent of pre-mRNA splicing.
  • Characterized the stability and high-copy expression of tRNA intronic circRNAs.

Conclusions:

  • A novel, conserved mechanism for producing circRNAs from tRNA introns was uncovered.
  • This method offers a versatile approach for generating stable, high-copy circRNA effectors.
  • The tRNA intronic circRNA production method is applicable across diverse metazoan cell types.