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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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eIF2A regulates cell migration in a translation-independent manner.

Jennifer Jungfleisch1, Neus Mestre-Farràs1, Raúl Gómez-Riera1

  • 1Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology (BIST), Dr. Aiguader 88, Barcelona 08003, Spain.

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Eukaryotic translation initiation factor 2A (eIF2A) regulates melanoma cell migration by influencing centrosome dynamics, independent of its known role in translation. This discovery reveals a novel function for eIF2A in cell movement.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Eukaryotic translation initiation factor 2A (eIF2A) is recognized as an alternative translation factor.
  • eIF2A has been implicated in tumor formation by promoting translation from near-cognate initiation codons.

Purpose of the Study:

  • To investigate the role of eIF2A in cell migration.
  • To explore functions of eIF2A beyond its canonical role in translation.

Main Methods:

  • Utilized a melanoma cell model (Mel-ST cells and H-Ras transformed metastatic cells).
  • Performed eIF2A depletion studies and interactome analyses.
  • Investigated eIF2A localization and centrosome dynamics using microscopy.

Main Results:

  • eIF2A depletion had minimal impact on global translation in melanoma cells.
  • Interactome studies revealed centrosomal proteins as key eIF2A binding partners.
  • eIF2A colocalizes with the centrosome, enhances its composition, and orients it during migration.

Conclusions:

  • eIF2A plays a significant role in regulating cell migration.
  • This function is independent of eIF2A's established role in translation initiation.
  • eIF2A impacts cell migration through modulation of centrosome dynamics.