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A universal approach to investigate circRNA protein coding function.

Dingding Mo1,2, Xinping Li3, Carsten A Raabe4,5,6

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Researchers developed a novel intron-mediated enhancement system to boost circular RNA (circRNA) production by fivefold. This advancement also revealed previously unknown circRNA translation, offering new tools for studying circRNA biogenesis and function.

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Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Biology

Background:

  • Circular RNAs (circRNAs) are a class of RNA molecules implicated in human diseases and regulatory pathways.
  • Investigating circRNA functions is challenging due to inefficient in vivo and ex vivo formation.
  • Current methods for circRNA production require enhancement for comprehensive study.

Purpose of the Study:

  • To develop an improved system for efficient circRNA formation and study its translation.
  • To investigate the translational capacity of circRNAs, including previously undetected instances.
  • To create a versatile expression vector for high-level circRNA production and analysis.

Main Methods:

  • Generation of an intron-mediated enhancement (IME) system to increase circRNA formation.
  • Utilizing Western blots and mass spectrometry to confirm circRNA translation.
  • Construction of a versatile circRNA expression vector, pCircRNA-DMo, for high-level production.

Main Results:

  • The IME system increased circRNA formation up to fivefold compared to existing methods.
  • Previously undetected translation of circRNAs, such as circRtn4, was observed.
  • circRtn4 translation yielded monomers and extended proteins, suggesting tandem repeats.
  • The pCircRNA-DMo vector efficiently produced multiple circRNAs at high levels.

Conclusions:

  • The developed IME system significantly enhances circRNA production, overcoming previous limitations.
  • The study provides evidence for circRNA translation, revealing novel protein products.
  • The pCircRNA-DMo vector is a valuable tool for advancing research into circRNA biogenesis and translation mechanisms.