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Mitochondrial dynamics regulate cell morphology in the developing cochlea.

James D B O'Sullivan1, Stephen Terry2,3, Claire A Scott1

  • 1Centre for Craniofacial and Regenerative Biology, King's College London, 27th Floor, Guy's Tower, London SE1 9RT, UK.

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Summary
This summary is machine-generated.

Mitochondrial dynamics regulate the size and shape of sensory hair cells (HCs) in the developing chick cochlea. Altering mitochondrial fusion impacts HC morphology, crucial for auditory function.

Keywords:
BiogenesisChickHearingMetabolismMitofusin

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Auditory Neuroscience

Background:

  • Cell size and shape are critical for physiological functions in multicellular tissues.
  • In the vertebrate auditory organ, sensory hair cells (HCs) exhibit distinct morphologies along the tonotopic axis, essential for sound perception.
  • Mitochondrial dynamics, involving fusion and fission, are known regulators of cell differentiation and function.

Purpose of the Study:

  • To investigate the role of mitochondrial dynamics in regulating the morphology of developing sensory hair cells (HCs).
  • To determine if mitochondrial remodeling differs between proximal (high-frequency) and distal (low-frequency) HCs in the chick basilar papilla (BP).

Main Methods:

  • Live imaging of mitochondrial networks in intact chick basilar papilla (BP) explants.
  • Experimental manipulation of mitochondrial dynamics in developing HCs.
  • Analysis of HC morphology following alterations in mitochondrial fusion and fission machinery.

Main Results:

  • Distinct remodeling of mitochondrial networks was observed in proximal versus distal HCs.
  • Inhibition of mitochondrial fusion machinery decreased proximal HC surface area.
  • Promotion of mitochondrial fusion increased distal HC surface area, altering normal morphology.

Conclusions:

  • Mitochondrial dynamics are a key regulator of sensory hair cell (HC) morphology in developing inner ear epithelia.
  • Specific modulation of mitochondrial fusion influences HC shape along the tonotopic axis, impacting auditory function.