Link Between Chronic Tinnitus and miR-30e, miR-206 , and miR-124 Polymorphisms Modulating the Brain-Derived...

Area of Science:

• Neuroscience
• Genetics
• Otolaryngology

Background:

• Brain-derived neurotrophic factor (BDNF) is vital for auditory system development.
• MicroRNAs (miRNAs) typically suppress BDNF expression, but can be promoted by BDNF.
• Dysregulation of this miRNA-BDNF interaction may impact hearing and contribute to tinnitus.

Purpose of the Study:

• To investigate the role of miRNA polymorphisms affecting BDNF in the pathophysiology of tinnitus.
• To identify specific miRNA gene variations associated with tinnitus risk.

Main Methods:

• Analyzed seven single-nucleotide polymorphisms (SNPs) in miRNAs (miR-30e, miR-206, miR-30a, miR-26b, miR-124) known to regulate BDNF.
• Genotyped 70 tinnitus patients and 70 healthy controls using the Fluidigm platform.
• Performed audiological and psychoacoustic evaluations for tinnitus assessment.

Main Results:

• Significant differences in genotype distributions for miR-30e (rs112439044), miR-124 (rs5315564), and miR-206 (rs16882131) were found between tinnitus patients and controls.
• miR-30e rs112439044 was associated with increased risk under dominant and additive models.
• miR-124 rs5315564 showed increased risk in the dominant model, while miR-206 rs16882131 demonstrated a protective effect in the dominant model and increased risk in the additive model.

Conclusions:

• Polymorphisms in miR-206, miR-30e, and miR-124 are associated with tinnitus.
• These miRNA variations may contribute to tinnitus pathophysiology by modulating BDNF gene expression.
• Findings highlight potential genetic factors influencing auditory system function and tinnitus development.