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Hearing Dysfunction in Xpa-Deficient Mice.

Hitomi Shinomiya1, Daisuke Yamashita1, Takeshi Fujita1

  • 1Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine Kobe, Japan.

Frontiers in Aging Neuroscience
|February 28, 2017
PubMed
Summary

Xeroderma pigmentosum (XP) is a rare genetic disorder. This study found that mice lacking the Xpa gene exhibit hearing loss, suggesting a link between DNA repair defects and sensorineural hearing loss in XP-A patients.

Keywords:
ABRSNHLXPorgan of Cortispiral ganglion neuronstria vascularis

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Area of Science:

  • Genetics
  • Neurology
  • Otolaryngology

Background:

  • Xeroderma pigmentosum (XP) is a rare genetic disorder caused by DNA repair defects.
  • XP presents with photosensitivity and neurological symptoms, with XP-A being the most severe subtype.
  • The pathogenesis of neurological symptoms, particularly sensorineural hearing loss (SNHL), in XP remains unclear.

Purpose of the Study:

  • To investigate the occurrence and underlying mechanisms of SNHL in XP-A.
  • To explore the potential link between Xpa gene deficiency and inner ear damage.

Main Methods:

  • Auditory brainstem response (ABR) measurements were performed on Xpa-deficient mice and wild-type controls.
  • Histological analysis was conducted to assess spiral ganglion neuron counts.

Main Results:

  • Xpa-deficient mice showed significantly elevated ABR thresholds at 4, 8, and 16 kHz compared to wild-type mice.
  • A reduction in spiral ganglion neurons was observed in Xpa-deficient mice.
  • These findings suggest hearing loss in Xpa-deficient mice is associated with spiral ganglion neuron deficiency.

Conclusions:

  • Xpa deficiency leads to sensorineural hearing loss in mice.
  • Spiral ganglion neuron deficiency is a likely cause of SNHL in XP-A.
  • This study provides crucial insights into the neurological aspects of XP-A pathogenesis.