Jacob's Syndrome and Hearing Loss: A Case Study

Area of Science:

• Genetics
• Otolaryngology
• Audiology

Background:

• Jacob's syndrome (XYY syndrome) is a chromosomal condition in males characterized by an extra Y chromosome.
• While often associated with increased height, other physical characteristics are typically absent.
• Hearing abnormalities in individuals with XYY syndrome have been understudied.

Purpose of the Study:

• To investigate hearing abnormalities in a child with Jacob's syndrome.
• To assess the audiological profile and potential causes of hearing loss in this specific case.

Main Methods:

• A four-year-old boy with Jacob's syndrome underwent a comprehensive auditory assessment.
• Tests included pure-tone audiometry, distortion product otoacoustic emissions, stapedial reflexes, auditory brainstem responses, and CT scans.
• Findings were correlated with imaging results.

Main Results:

• The assessment revealed bilateral conductive hearing loss, evidenced by air-bone gaps, absent otoacoustic emissions, and abnormal stapedial reflexes.
• Auditory brainstem responses showed normal interwave latencies but delayed absolute latencies, consistent with conductive hearing loss.
• CT scans indicated stapes footplate fixation, supporting the audiological findings.

Conclusions:

• Bilateral stapes fixation was suspected in a young boy with Jacob's syndrome, leading to mild bilateral conductive hearing loss.
• While the exact cause of stapes fixation remains undetermined (congenital or acquired), audiological and imaging data were supportive.
• Routine audiological and otological evaluations are recommended for early detection of hearing impairment in children with Jacob's syndrome.