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Miro proteins coordinate microtubule- and actin-dependent mitochondrial transport and distribution

Guillermo López-Doménech1, Christian Covill-Cooke1, Davor Ivankovic1

  • 1Department of Neuroscience, Physiology and Pharmacology, University College London, London, UK.

The EMBO Journal
|January 10, 2018
PubMed

Insights

Miro proteins are essential for embryonic development, controlling mitochondrial movement along both actin and tubulin tracks. Their absence disrupts mitochondrial positioning and cell proliferation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Miro1 and Miro2 Rho-GTPases are known regulators of mitochondrial transport via kinesin and dynein motors.
  • Their precise roles in embryonic development and subcellular mitochondrial distribution remain incompletely understood.

Purpose of the Study:

  • To elucidate the essential and non-redundant functions of Miro1 and Miro2 in embryonic development.
  • To investigate the impact of Miro proteins on mitochondrial motility, positioning, and interaction with cytoskeletal elements.
  • To determine Miro's role in mitophagy and mitochondrial segregation during mitosis.

Main Methods:

  • Generation of Miro1/2 double-knockout mouse embryos and embryonic fibroblasts.
  • Analysis of mitochondrial motility and localization using microscopy.
  • Investigation of Miro's interaction with motor proteins (TRAK1/2) and actin-binding proteins (Myo19).
  • Assessment of mitophagy pathways (PINK1/Parkin) and mitochondrial segregation during mitosis.

Main Results:

  • Miro1/2 knockout embryos exhibit developmental defects and altered subcellular mitochondrial distribution.
  • Miro proteins are essential for recruiting and stabilizing Myo19, linking mitochondria to the actin cytoskeleton.
  • TRAK2-mediated retrograde transport is Miro1-dependent, while anterograde transport can occur independently of Miro.
  • Miro depletion leads to Myo19 loss during mitophagy and disrupts mitochondrial segregation during mitosis.

Conclusions:

  • Miro proteins play critical, non-redundant roles in embryonic development and mitochondrial positioning.
  • Miro fine-tunes both actin- and tubulin-dependent mitochondrial motility and localization.
  • Miro proteins are crucial for maintaining mitochondrial homeostasis, cell proliferation, and proper cell division.
Keywords:
Rhot1Rhot2micropatternmitofusinmyosin XIX

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