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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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NEGotiating Cell Identity through Regulated Cytoplasmic Polyadenylation.

Pradeep M Joshi1, Joel H Rothman2

  • 1Department of MCD Biology and Neuroscience Research Institute, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.

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Summary

RNA binding proteins control poly(A) tail length of maternal mRNAs. This regulates asymmetric cell fate determination in early C. elegans embryos and may establish cell identities.

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Area of Science:

  • Developmental biology
  • Molecular biology
  • Genetics

Background:

  • Cell fate determination is crucial for embryonic development.
  • Asymmetric gene expression patterns establish cell identity.
  • Regulation of messenger RNA (mRNA) stability and translation is key.

Purpose of the Study:

  • To investigate the role of RNA binding proteins in early C. elegans embryogenesis.
  • To understand how poly(A) tail length of maternal mRNAs influences cell fate.
  • To explore the broader implications of this mechanism in establishing cell identities.

Main Methods:

  • Combinatorial analysis of RNA binding proteins.
  • Poly(A) tail length profiling of maternal mRNAs.
  • Analysis of cell fate determinant expression in C. elegans embryos.
  • Genome-wide profiling techniques.

Main Results:

  • Combinatorial action of RNA binding proteins modulates poly(A) tail length.
  • Modulated poly(A) tail length leads to asymmetric expression of a cell fate determinant.
  • This mechanism is suggested to be widely utilized in establishing cell identities.

Conclusions:

  • RNA binding proteins play a critical role in regulating mRNA poly(A) tail length.
  • This regulation is essential for establishing asymmetric cell fate in early development.
  • The identified mechanism likely contributes to cell identity establishment across various contexts.