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Identification of Circular RNAs using RNA Sequencing
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Circular RNA Formation and Degradation Are Not Directed by Universal Pathways.

Arvind Srinivasan1, Emilia Mroczko-Młotek1, Marzena Wojciechowska1

  • 1Department of Rare Diseases, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, 61-704 Poznan, Poland.

International Journal of Molecular Sciences
|January 25, 2025
PubMed
Summary
This summary is machine-generated.

Circular RNAs (circRNAs) are unique RNA molecules formed by back-splicing. This review explores the formation and degradation pathways of circRNAs and factors influencing their stability in eukaryotes.

Keywords:
alternative splicingback-splicingcircular RNAscis-regulatory elementstrans-acting factors

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Circular RNAs (circRNAs) are distinct RNA transcripts with a closed-loop structure.
  • Their biogenesis involves back-splicing, differing from conventional linear RNA formation.
  • circRNAs can be exonic, intronic, or exonic-intronic, with various isoforms.

Purpose of the Study:

  • To review the diverse pathways of circRNA biogenesis.
  • To explore the mechanisms and factors involved in circRNA degradation.
  • To understand the regulatory elements influencing circRNA formation and stability.

Main Methods:

  • Literature review of circRNA biogenesis and degradation pathways.
  • Analysis of regulatory elements (cis-acting elements, trans-acting factors) in circRNA formation.
  • Examination of factors affecting circRNA stability and turnover.

Main Results:

  • circRNA biogenesis is regulated by cis-regulatory elements and trans-acting factors, including intronic Alu repeats and RNA-binding proteins.
  • Multiple pathways contribute to circRNA generation, including back-splicing, exon skipping, and intron retention.
  • circRNA degradation pathways are not fully elucidated, with ongoing research into endonucleolytic and exonuclease-mediated mechanisms.

Conclusions:

  • Understanding circRNA biogenesis and degradation is crucial for comprehending their biological roles.
  • Key factors influence the formation and stability of circRNAs in higher eukaryotes.
  • Further research is needed to clarify the universal or specific mechanisms governing circRNA life cycles.