The prevalence of mitochondrial mutations associated with aminoglycoside-induced sensorineural hearing loss in an

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Megan Ealy1, Katherine A Lynch, Nicole C Meyer

  • 1Molecular Otolaryngology and Renal Research Laboratories, Department of Otolaryngology, University of Iowa, Iowa City, Iowa 52242, USA.

The Laryngoscope
|April 16, 2011
PubMed

Insights

Mitochondrial DNA variants linked to hearing loss risk are common in premature infants. These infants face a lifetime risk of aminoglycoside-induced deafness, even without initial hearing loss detection.

Area of Science:

  • Genetics
  • Otolaryngology
  • Pharmacogenomics

Background:

  • Aminoglycoside antibiotics are crucial for treating infections in premature infants.
  • Specific mitochondrial DNA variants in the MT-RNR1 gene are associated with sensorineural hearing loss.
  • Premature infants in neonatal intensive care units (NICUs) are at high risk due to aminoglycoside exposure.

Purpose of the Study:

  • To determine the prevalence of five key mitochondrial DNA variants in the 12S rRNA gene (MT-RNR1).
  • To compare the frequency of these variants in neonatal intensive care unit (NICU) patients versus the general population.

Main Methods:

  • Genotyping of 703 NICU patients and 1473 individuals from the general Iowa population.
  • Analysis focused on five specific mitochondrial DNA variants within the MT-RNR1 gene.

Main Results:

  • The aggregate frequency of the studied mitochondrial DNA variants was approximately 1.8%.
  • This frequency was comparable between the NICU patient cohort and the general Iowa population.
  • No hearing loss was detected in NICU patients via newborn hearing screens.

Conclusions:

  • The prevalence of these risk variants is similar in NICU graduates and the general population.
  • NICU graduates carrying these variants have an elevated lifetime risk for aminoglycoside-induced deafness.
  • Early identification and monitoring are crucial for preventing hearing loss in at-risk infants.

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