mRNA export from mammalian cell nuclei is dependent on GANP

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Updated: Jun 17, 2026

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
11:32

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

Published on: December 4, 2010

Vihandha O Wickramasinghe1, Paul I A McMurtrie, Anthony D Mills

  • 1MRC Cancer Cell Unit, Hutchison/MRC Research Centre, Hills Road, Cambridge CB2 0XZ, UK. vw222@hutchison-mrc.cam.ac.uk

Current Biology : CB
|December 17, 2009
PubMed

Insights

Germinal center-associated nuclear protein (GANP) is essential for efficient mRNA nuclear export in mammalian cells. GANP facilitates the recruitment of NXF1 to nuclear pore complexes, ensuring proper messenger ribonucleoprotein export.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Nuclear pore complexes (NPCs) regulate transport between the nucleus and cytoplasm.
  • Bulk nuclear export of messenger ribonucleoproteins (mRNPs) is primarily mediated by the NXF1 pathway.
  • Adaptor proteins like ALY and SR splicing factors facilitate mRNP binding to NXF1.

Purpose of the Study:

  • To investigate the role of germinal center-associated nuclear protein (GANP) in mammalian mRNA nuclear export.
  • To determine GANP's interaction with the NXF1 export machinery and NPCs.
  • To elucidate GANP's contribution to the mRNP translocation process.

Main Methods:

  • Depletion of GANP in mammalian cells.
  • Analysis of mRNP and NXF1 localization using microscopy.
  • Biochemical assays to study protein interactions (GANP, NXF1, NPCs).
  • Functional studies involving GANP fragment overexpression and transcription inhibition.

Main Results:

  • GANP is required for efficient mRNP nuclear export and NXF1 recruitment to NPCs.
  • GANP depletion leads to nuclear retention of mRNPs and NXF1 in punctate foci.
  • GANP interacts with NXF1 and NPCs, with specific FG motifs mediating interaction with NXF1.
  • Overexpression of a GANP fragment causes nuclear accumulation of poly(A)(+)RNA and NXF1.

Conclusions:

  • GANP is an integral component of the mammalian mRNA export machinery.
  • GANP facilitates the transfer of NXF1-containing mRNPs to NPCs.
  • GANP acts as a crucial link between mRNPs and the NPC transport channel.

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