Neurosensory Affectation in Patients Affected by Wolfram Syndrome: Descriptive and Longitudinal Analysis

Area of Science:

• Neuroscience
• Genetics
• Audiology

Background:

• Wolfram syndrome (WS) is a rare, autosomal recessive neurodegenerative disorder.
• Sensorineural hearing loss is a fundamental but understudied aspect of WS.
• Standardized assessment protocols are needed for effective patient management.

Purpose of the Study:

• To comprehensively understand Wolfram syndrome from a biomedical perspective.
• To establish a set of essential tests for diagnosing and monitoring WS patients.
• To correlate genotype with phenotype, specifically hearing loss severity.

Main Methods:

• Utilized audiological assessments including pure-tone audiometry, tympanometry, speech perception, speech intelligibility index, and high-frequency testing.
• Employed mixed linear models to analyze age, time, and interaction effects on auditory measures (IPT, HFA, ABR, BAEP).
• Conducted genetic analysis to classify mutations and correlate them with clinical phenotypes.

Main Results:

• Audiological measurements were identified as suitable for standardized WS follow-up.
• Genetic analysis revealed three phenotype-genotype groups, with homozygous gene changes linked to more severe neurosensory deficits.
• Mixed linear models provided insights into the progression of auditory impairments.

Conclusions:

• Early identification of sensorineural hearing loss in WS is critical for timely intervention.
• A defined set of audiological and genetic tests facilitates efficient diagnosis, follow-up, and control of WS.
• Understanding the genotype-phenotype relationship aids in predicting disease severity and tailoring treatment.