GJB2 rs1799884: Understanding the 35delG Variant
The rs1799884 variant, widely known as 35delG, is a specific genetic change within the GJB2 gene. It is recognized as a major cause of autosomal recessive nonsyndromic sensorineural hearing loss in many populations worldwide.
What each genotype means
Typical hearing profile
You do not carry the c.35delG frameshift variant in the GJB2 gene. Research shows that having two intact copies of this sequence is the typical baseline profile and is not associated with an increased genetic risk for GJB2-related autosomal recessive hearing loss.
Found in more than 98% of European ancestry populations and virtually all individuals of East Asian ancestry.
Carrier of 35delG
You carry one normal copy and one deletion copy of the GJB2 gene, widely known as the 35delG (or c.35delG) mutation. Autosomal recessive non-syndromic hearing loss typically requires two altered copies; therefore, single-copy carriers typically experience normal hearing but have a 50% chance of passing the variant to biological children.
Present in roughly 1% to 2% of individuals of European and Mediterranean descent, but extremely rare in East Asian populations.
What is the rs1799884 Variant?
The variant rs1799884, commonly referred to in scientific literature as 35delG, is a frameshift mutation located within the GJB2 gene. This specific mutation involves the deletion of a single guanine nucleotide at position 35 of the gene's coding sequence. Because DNA is read in triplets, this deletion shifts the reading frame of the genetic code, which typically leads to the production of a truncated and non-functional protein. This variant is situated on chromosome 13 at the 13q12.11 locus. It is one of the most extensively studied genetic markers in the context of hereditary hearing impairment, and its presence is often investigated when individuals present with congenital, non-progressive sensorineural hearing loss.
The Role of the GJB2 Gene
The GJB2 gene provides instructions for making a protein called gap junction beta-2, also known as connexin 26. Connexins are essential components of gap junctions, which are specialized channels that allow for the direct exchange of ions and small molecules between adjacent cells. In the inner ear, specifically within the cochlea, these channels are critical for maintaining the chemical environment necessary for the hair cells to function properly. When GJB2 is mutated, such as with the 35delG variant, the resulting connexin 26 protein may be absent or dysfunctional. This disruption prevents the proper recycling of potassium ions in the cochlea, which is a fundamental process for the transduction of sound waves into electrical signals that the brain can interpret as hearing.
Research and Clinical Associations
Research has established a strong association between the homozygous state of the 35delG variant and autosomal recessive nonsyndromic sensorineural hearing loss. This condition is characterized by hearing impairment that is present at birth and is typically not associated with other physical symptoms or syndromes. The evidence for this association is robust, with many studies identifying it as the most frequent genetic cause of congenital hearing loss in various populations, particularly those of European descent. While the link to hearing loss is well-documented, the severity and onset can vary between individuals. It is important to note that genetic testing for this variant is often used in clinical settings to help identify the underlying cause of hearing loss, but it should always be interpreted by a qualified genetic counselor or medical professional.
Population Frequency
The frequency of the 35delG variant varies significantly across different global populations. It is particularly prevalent in European populations, where the carrier frequency is estimated to be approximately 1-2%. This high frequency is thought to be the result of a founder effect, where the mutation was passed down from a common ancestor rather than occurring independently as a new mutation in many different people. In other parts of the world, such as East Asia, different GJB2 mutations are more common, such as 235delC. Because of these ancestry-specific patterns, the likelihood of carrying this specific variant depends heavily on an individual's genetic background and family history.
Navigating Genetic Information
Understanding your genetic status regarding rs1799884 can provide insights into the potential causes of hearing loss within a family. However, it is crucial to recognize that genetic information is complex and should not be used for self-diagnosis. If you or a family member are concerned about hearing loss, the most appropriate step is to consult with an audiologist, an otolaryngologist, or a clinical geneticist. These professionals can provide appropriate testing, interpret results in the context of your personal and family medical history, and discuss potential management or support options. Genetic testing is a tool for information, not a substitute for professional medical evaluation and care.
How common is this variant?
The 35delG variant has a carrier frequency of approximately 1-2% in populations of European descent, largely attributed to a founder effect.
Frequently asked questions
Is 35delG the same as rs1799884?
Yes, 35delG is the common name used in scientific literature to describe the specific deletion mutation identified by the rsID rs1799884 in the GJB2 gene.
Does having the 35delG mutation mean I will have hearing loss?
Inheritance of this condition is autosomal recessive, meaning that typically both copies of the gene must be affected for hearing loss to occur. Carriers with only one copy of the mutation usually have normal hearing.
Can I be tested for the GJB2 35delG mutation?
Yes, clinical genetic testing is available for GJB2 mutations. You should discuss the necessity and implications of such testing with a healthcare provider or a genetic counselor.
Are there other causes of genetic hearing loss?
Yes, there are many different genes and variants that can contribute to hereditary hearing loss. GJB2 is one of the most common, but it is not the only cause.
Sources & further reading
Educational information only, last refreshed 10/11/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Pathogenic nonsense variant (p.Trp24Ter) in GJB2, representing one of the major causative alleles for autosomal recessive non-syndromic hearing loss in Mediterranean and South Asian groups.
This variant is associated with autosomal recessive nonsyndromic hearing loss.
Missense variant (p.Arg127His) in the GJB2 gene. While often reported in individuals with hearing loss, it is frequently classified as benign or likely benign in clinical databases when found in isolation, as it is common in the general population.
A missense variant (c.109G>A, p.Val37Ile) in GJB2, often identified as a common pathogenic variant associated with mild to moderate autosomal recessive nonsyndromic hearing loss (DFNB1A).
Frameshift deletion (c.235delC) conferring carrier status for autosomal recessive non-syndromic sensorineural hearing loss.
Common East Asian frameshift mutation (c.235delC) causing severe truncation of Connexin 26, a major cause of autosomal recessive nonsyndromic hearing loss.