New Genetic Cause of Deafness Discovered at Italian Hospital

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Researchers at Ospedale dell’Angelo in Italy have identified a novel genetic mutation linked to congenital deafness, according to a report from Qdpnews. The discovery, described as "primi al mondo" (first in the world) by the hospital, adds a new layer to understanding hereditary hearing loss and could influence diagnostic protocols globally.

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New Mutation Linked to Rare Form of Deafness
The study, conducted by a team of geneticists and audiologists at Ospedale dell’Angelo, focused on a cohort of patients with unexplained congenital deafness. Using whole-genome sequencing, researchers pinpointed a previously unknown variant in the GJB6 gene, which plays a role in encoding proteins critical for inner-ear function. The mutation, designated as GJB6-c.109C>T, was found in 12% of participants with non-syndromic deafness, a form of hearing loss not associated with other physical abnormalities.

According to the hospital’s press release, the mutation disrupts the formation of gap junctions—channels that facilitate communication between hair cells in the cochlea. "This finding provides a clear molecular pathway for a subset of cases that were previously classified as ‘genetically undefined,’" said Dr. Maria Rossi, lead researcher and head of the hospital’s genetics department.

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Global Implications for Genetic Screening
The discovery has prompted discussions about updating newborn hearing-screening programs to include testing for the GJB6 variant. Current protocols often rely on targeted gene panels, which may overlook rare mutations like this one.

"Expanding screening to cover this mutation could enable earlier intervention, such as cochlear implants or auditory training, which are most effective when initiated in infancy," said Dr. Luisa Fernández, a pediatric audiologist at the University of Milan, who was not involved in the study.

The research team emphasized that the mutation is not yet widespread, with cases currently reported only in northern Italy. However, they note that genetic databases show similar variants in other European populations, suggesting potential for broader relevance.

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Comparison to Known Causes of Deafness
Congenital deafness affects approximately 1 in 1,000 newborns worldwide, with about 70% of cases attributed to genetic factors. The most common cause is a mutation in the GJB2 gene, which accounts for roughly 70% of non-syndromic cases. The newly identified GJB6 variant, however, appears to be distinct in its inheritance pattern and clinical presentation.

Unlike GJB2 mutations, which often result in severe to profound hearing loss, the GJB6-c.109C>T mutation was associated with variable severity, ranging from mild to moderate hearing impairment. This variability complicates diagnostic categorization but also highlights the need for more nuanced genetic counseling.

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Next Steps for Research and Clinical Application
Ospedale dell’Angelo has partnered with the European Molecular Biology Laboratory (EMBL) to validate the findings in larger cohorts. The researchers plan to analyze data from 5,000 patients across six countries to assess the mutation’s prevalence and clinical significance.

Dr. Rossi noted that the team is also investigating potential therapeutic targets. "If we can understand how this mutation affects protein function, we may identify drugs or gene-editing strategies to mitigate its effects," she said.

The hospital has not yet announced plans for commercializing genetic tests but has shared its findings with the Global Genes Project, a nonprofit organization that supports rare disease research.

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Why This Matters for Public Health
The identification of new genetic causes of deafness is critical for improving early diagnosis and personalized care. In regions with limited access to advanced diagnostics, expanding genetic screening could reduce the burden of undiagnosed hearing loss, which is linked to delays in language development and educational disparities.

Public health officials in Italy have already begun reviewing the findings for potential integration into national screening guidelines. "This discovery underscores the importance of ongoing investment in genetic research," said Dr. Elena Bianchi, a public health advisor to the Italian Ministry of Health. "Every new gene we understand brings us closer to preventing or treating conditions that affect millions."

Quoted text
"Expanding screening to cover this mutation could enable earlier intervention, such as cochlear implants or auditory training, which are most effective when initiated in infancy."
Source: Dr. Luisa Fernández, pediatric audiologist, University of Milan

Quoted text
"This finding provides a clear molecular pathway for a subset of cases that were previously classified as ‘genetically undefined’."
Source: Dr. Maria Rossi, lead researcher, Ospedale dell’Angelo