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Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells
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Orchestrated intron retention regulates normal granulocyte differentiation.

Justin J-L Wong1, William Ritchie, Olivia A Ebner

  • 1Gene and Stem Cell Therapy Program, Centenary Institute, Camperdown 2050, Australia.

Cell
|August 6, 2013
PubMed
Summary

Intron retention (IR) is a normal gene expression control mechanism, not just mis-splicing. This conserved process, coupled with nonsense-mediated decay (NMD), regulates gene expression during granulopoiesis.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Cellular Differentiation

Background:

  • Intron retention (IR) is typically viewed as a splicing error.
  • Its role in normal physiological processes is not well understood.

Purpose of the Study:

  • To investigate the role of intron retention in normal gene expression during white blood cell differentiation.
  • To determine if IR is a regulated mechanism and its associated pathways.

Main Methods:

  • Bioinformatic analyses of transcriptomic and proteomic data from normal white blood cell differentiation.
  • Investigated gene expression regulation, splicing factors, GC content, and conserved pathways between human and mouse.

Main Results:

  • Identified intron retention (IR) as a physiological mechanism controlling gene expression in 86 functionally related genes during granulopoiesis.
  • Demonstrated that IR, conserved in humans and mice, reduces mRNA and protein levels via the nonsense-mediated decay (NMD) pathway.
  • Observed association of IR with splicing factor downregulation and higher GC content.

Conclusions:

  • Intron retention coupled with nonsense-mediated decay is a conserved physiological mechanism for gene expression control in normal granulopoiesis.
  • This regulated IR offers an energetically favorable method for dynamic gene expression control before sustained translation.