GJB2 rs80338948: Understanding This Hearing-Related Variant
The rs80338948 variant is a specific genetic change located within the GJB2 gene. It is primarily studied for its association with autosomal recessive nonsyndromic hearing loss.
What each genotype means
Typical GJB2 genotype
This genotype represents the common, non-variant form of the GJB2 gene at this position. It is not associated with the specific recessive deafness mutation linked to this variant.
This is the most common genotype observed in the general population.
Carrier of deafness mutation
This genotype indicates you carry one copy of the variant associated with autosomal recessive nonsyndromic hearing loss. Because this condition is recessive, carriers typically do not experience hearing loss themselves, but they may pass the variant to their children.
The frequency of this carrier state varies significantly by ancestry and is most frequently studied in populations where this specific GJB2 mutation is prevalent.
Associated with hearing loss
This genotype is associated with autosomal recessive nonsyndromic hearing loss, a condition affecting the ability to hear. If you have concerns about your hearing or family history, please discuss these results with a clinical geneticist or healthcare provider.
This genotype is rare in the general population and is primarily identified in clinical settings related to hereditary hearing impairment.
What is rs80338948?
The variant rs80338948 is a single nucleotide polymorphism (SNP) located on chromosome 13 within the GJB2 gene. In genetic terms, this variant represents a specific change in the DNA sequence where one nucleotide is substituted for another. Because it occurs within a gene that provides instructions for making a protein, researchers monitor this site to understand how such changes might affect biological function. This variant is frequently included in genomic screening panels because of its documented role in clinical genetics. It is important to note that while the variant is identified by a specific rsID, it is part of the broader landscape of human genetic diversity, and its presence does not automatically imply a specific health outcome for every individual.
The Role of the GJB2 Gene
The GJB2 gene encodes a protein called connexin 26. This protein is a critical component of gap junctions, which are specialized channels that allow cells to communicate and exchange small molecules. In the inner ear, these gap junctions are essential for maintaining the chemical balance required for the proper function of hair cells, which are responsible for converting sound waves into electrical signals for the brain. When the GJB2 gene contains certain variants, the production or function of the connexin 26 protein can be disrupted. This disruption can interfere with the delicate environment of the inner ear, potentially leading to hearing impairment. Understanding the function of this gene is central to research regarding hereditary forms of deafness.
Research and Clinical Evidence
Scientific literature and clinical databases, such as ClinVar, classify rs80338948 as a pathogenic variant in the context of autosomal recessive nonsyndromic hearing loss. This means that when an individual inherits two copies of the variant—one from each parent—it is strongly associated with a higher likelihood of experiencing hearing impairment. The evidence for this association is supported by various studies, including those identifying the variant in families affected by sensorineural deafness. However, clinical interpretation can be complex, and the presence of this variant is typically evaluated alongside an individual's clinical history and family background. Because the evidence is based on clinical observations, it is essential to consult with a genetic counselor or a medical professional to understand what these findings mean in a personal health context.
Population Frequency
The frequency of the rs80338948 variant varies across different global populations. According to available genetic databases, it is considered a rare variant in the general population, meaning it is not found in the majority of individuals. Because it is a recessive trait, the risk of hearing loss is generally associated with the homozygous state (having two copies of the variant). Population-specific studies are ongoing to better understand the distribution of this variant across diverse ancestral groups. These frequency data are crucial for researchers to distinguish between common genetic variations and those that are more likely to have a significant clinical impact.
Navigating Genetic Information
If you have received information about your status for rs80338948, it is important to approach the data with care. Genetic testing results are not a diagnosis, and they should always be interpreted by a qualified healthcare provider who can consider your full medical and family history. You cannot use this information to self-diagnose or make medical decisions independently. If you are concerned about hearing health or the potential for hereditary conditions, discuss these results with a clinician or a certified genetic counselor. They can provide context, explain the implications of your specific genotype, and guide you through any necessary follow-up steps or clinical evaluations. Genetic information is a tool for health management, not a substitute for professional medical advice.
How common is this variant?
The rs80338948 variant is rare in the general population, with a global minor allele frequency reported at approximately 0.0004591.
Frequently asked questions
What does it mean to be a carrier of rs80338948?
Being a carrier means you have one copy of the variant and one typical copy of the gene. Because the associated hearing loss is recessive, carriers usually do not experience hearing impairment related to this specific variant.
Is rs80338948 the only cause of hearing loss?
No, hearing loss is a complex condition with many potential causes, including other genetic variants in GJB2 or different genes, as well as environmental factors. This variant is only one of many factors that can contribute to hearing health.
Should I get tested for this variant?
Genetic testing is a personal decision that should be made in consultation with a healthcare provider. If you have a family history of hearing loss, a doctor or genetic counselor can help determine if testing is appropriate for you.
Can I change my risk if I have the T/T genotype?
Genetic variants are inherited and cannot be changed. However, knowing your genetic status can help you and your healthcare team monitor your health and access appropriate support or interventions if needed.
Sources & further reading
Educational information only, last refreshed 10/4/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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