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miR-431 is involved in regulating cochlear function by targeting Eya4.

Yue Fan1, Ying Zhang1, Rimao Wu2

  • 1Department of Otolaryngology, Peking Union Medical College Hospital, Shuaifuyuan No.1, Beijing 100730, China.

Biochimica Et Biophysica Acta
|August 23, 2016
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Summary

High levels of microRNA-431 (miR-431) in mouse cochleae lead to hearing loss by reducing spiral ganglion neuron (SGN) density. This study clarifies a potential cause of hereditary deafness.

Keywords:
CochleaeEya4Spiral ganglion neuronTransgenic mousemiR-431

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Area of Science:

  • Genetics
  • Neuroscience
  • Otolaryngology

Background:

  • MicroRNAs (miRNAs) play crucial roles in gene regulation.
  • Understanding miRNA function is vital for clarifying causes of hereditary deafness.
  • miR-431's role in cochlear development and hearing loss requires investigation.

Purpose of the Study:

  • To investigate the function of miR-431 in the cochlea.
  • To elucidate the relationship between miR-431 and hearing loss.
  • To identify the molecular mechanisms underlying miR-431's effects on spiral ganglion neurons (SGNs).

Main Methods:

  • Spatial-temporal expression analysis of miR-431 in mouse cochleae using real-time PCR and in situ hybridization.
  • Generation and analysis of miR-431 overexpressing transgenic (Tg) mice.
  • Auditory brain stem response (ABR) testing, SGN density assessment, primary SGN culture, bioinformatics analysis, luciferase reporter assays, and western blotting.

Main Results:

  • miR-431 expression was high in newborn mouse SGNs, decreasing with development.
  • Tg mice exhibited significantly higher ABR thresholds and lower SGN density compared to wild-type mice.
  • miR-431 overexpression inhibited Eya4 translation, leading to EYA4 deficiency.

Conclusions:

  • Excessive miR-431 in the cochlea leads to reduced SGN density and potential hearing loss.
  • miR-431 directly targets and inhibits Eya4 expression.
  • This study identifies a novel molecular mechanism contributing to hereditary deafness.