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Cytoplasmic intron retention, function, splicing, and the sentinel RNA hypothesis.

Peter T Buckley1, Mugdha Khaladkar, Junhyong Kim

  • 1Department of Pharmacology, Perelman School of Medicine and the School of Arts and Sciences, University of Pennsylvania, Philadelphia, PA, USA.

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Cytoplasmic splicing, a new form of gene regulation, generates RNA diversity in cells. This process, involving retained introns in the cytoplasm, contributes to cellular function and RNA-based messaging.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • RNA Processing

Background:

  • Cytoplasmic splicing is an emerging regulatory mechanism in mammalian cells.
  • Noncanonical transcript processing, including cytoplasmic splicing, is increasingly recognized for its role in cellular function.
  • Numerous transcripts are identified as undergoing regulated extranuclear splicing.

Purpose of the Study:

  • To review existing data on cytoplasmic retained introns.
  • To explore the role of cytoplasmic splicing in generating transcript variants.
  • To propose cytoplasmic retained introns as a component of 'sentinel RNA'.

Main Methods:

  • Literature review of studies on cytoplasmic splicing.
  • Analysis of data on retained introns across various cell types.
  • Examination of genome-wide analyses of intron retention.

Main Results:

  • Evidence supports the importance of cytoplasmic splicing in normal cellular function.
  • A growing number of transcripts are found to undergo cytoplasmic splicing.
  • Cytoplasmic retained introns may function as 'sentinel RNA'.

Conclusions:

  • Cytoplasmic splicing contributes to molecular diversity in mammalian cells.
  • Retained introns in the cytoplasm can generate transcript variants.
  • These sequences may serve as a source for RNA-based secondary messages.