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PMCA2 pump mutations and hereditary deafness.

Mario Bortolozzi1, Fabio Mammano2

  • 1University of Padua, Department of Physics and Astronomy "G. Galilei", Padua, Italy; Venetian Institute of Molecular Medicine (VIMM), Padua, Italy; CNR Institute of Protein Biochemistry, Naples, Italy.

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|February 18, 2018
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Summary

The plasma-membrane calcium-pump isoform 2 (PMCA2w/a) regulates calcium in inner ear hair cells. Mutations in PMCA2w/a cause deafness and balance disorders by impairing hair cell function.

Keywords:
Ca(2+) homeostasisDeafnessHair cellsMechanotransductionMouse modelsStereocilia

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Area of Science:

  • Neuroscience
  • Otolaryngology
  • Genetics

Background:

  • Inner ear hair cells detect stimuli via stereocilia, involving ion channels.
  • Calcium influx is critical for hair cell function but requires tight regulation.
  • The PMCA2w/a pump variant plays a unique role in controlling cytoplasmic calcium levels.

Purpose of the Study:

  • Investigate the role of the PMCA2w/a pump in hair cell function and calcium homeostasis.
  • Understand the mechanisms by which PMCA2w/a mutations lead to hearing and balance disorders.

Main Methods:

  • Analysis of mouse models with genetic ablation or mutation of the PMCA2w/a pump.
  • Assessment of hair cell function, mechanotransduction, and calcium regulation.
  • Histological examination of the organ of Corti.

Main Results:

  • PMCA2w/a deficiency causes impaired hearing and balance in mice.
  • Defects in stereociliary calcium homeostasis and mechanotransduction channel sensitivity were observed.
  • Progressive degeneration of the organ of Corti was evident in affected mice.

Conclusions:

  • The PMCA2w/a pump is essential for maintaining hair cell function and survival.
  • Dysregulation of stereociliary calcium by PMCA2w/a is a key factor in deafness and vestibular disorders.
  • This study provides mechanistic insights into the etiology of these conditions.