ATP6V1B1 rs121964879: What Your Genotype Means
The variant rs121964879 is a rare genetic change located within the ATP6V1B1 gene. It has been identified in clinical studies as a pathogenic variant associated with distal renal tubular acidosis, a condition affecting the kidneys' ability to maintain proper acid-base balance.
What each genotype means
Typical genetic profile
This genotype represents the common, non-variant form of the ATP6V1B1 gene at this location. It is not associated with the clinical conditions linked to the variant allele.
This is the most common genotype found in the general population.
Carrier status
Individuals with this genotype carry one copy of the variant associated with distal renal tubular acidosis with progressive deafness. As this condition typically follows an autosomal recessive inheritance pattern, carriers are generally asymptomatic, but you should consult with a genetic counselor or clinician to understand potential implications for family planning.
This genotype is rare in the general population.
Associated with clinical condition
This genotype is associated with distal renal tubular acidosis with progressive deafness, a condition involving the kidneys and hearing. Because this is a clinical finding, please discuss these results with a healthcare provider or medical geneticist to determine if any diagnostic follow-up or clinical management is appropriate for your health.
This genotype is very rare in the general population.
Understanding the SNP and Its Location
The variant rs121964879 is a single nucleotide polymorphism (SNP) situated on chromosome 2. In the human genome, this specific position is located within the ATP6V1B1 gene. SNPs are the most common type of genetic variation among people, representing a difference in a single DNA building block, or nucleotide. While many SNPs are neutral and have no effect on health, others can alter the function of the proteins encoded by our genes. Because this variant is located within a gene that provides instructions for a critical cellular component, researchers monitor its presence closely in clinical genomic studies to understand its potential impact on human physiology.
The Role of the ATP6V1B1 Gene
The ATP6V1B1 gene provides instructions for making a subunit of an enzyme called vacuolar H+-ATPase. This enzyme acts as a proton pump, which is essential for moving hydrogen ions across cell membranes. This process is vital for maintaining the correct pH levels within various parts of the body, including the kidneys and the inner ear. When this gene functions correctly, it helps the kidneys excrete acid into the urine, keeping the blood's pH in a healthy range. If the gene is altered, the resulting protein may not function properly, which can disrupt these delicate chemical balances and lead to specific clinical symptoms related to kidney function and hearing.
Clinical Associations and Evidence
Research has associated the presence of the rs121964879 variant with distal renal tubular acidosis, a condition that can sometimes be accompanied by progressive hearing loss. The evidence for this association is derived from clinical genomic studies where the variant has been classified as pathogenic. In the context of clinical genetics, 'pathogenic' means that the variant is considered to be the cause of the observed disease. It is important to note that this variant is rare, and its identification is typically part of a diagnostic process for individuals already presenting with specific clinical symptoms. The strength of this evidence is considered moderate to high in clinical settings, as it is documented in databases like ClinVar as a known cause of this specific hereditary condition.
Population Frequency
The rs121964879 variant is classified as rare in the general population. Because it is not a common polymorphism, it is not typically found in large-scale, healthy reference populations at high frequencies. Genetic databases like gnomAD are used by scientists to determine how common a variant is across different ancestral groups. For rare variants like this one, the absence of the variant in large, healthy cohorts is often used as evidence to support its potential clinical significance. If you have received information about this variant from a clinical test, it is because it was specifically identified during a diagnostic evaluation rather than as a common trait found in the general public.
What You Can Do With This Information
If you have been informed that you carry the rs121964879 variant, it is essential to understand that this information is for educational purposes and does not constitute a medical diagnosis. Genetic variants can have complex interactions with other genes and environmental factors. You should never make changes to your health management or medication based on genetic data without consulting a qualified healthcare professional. A clinical geneticist or a genetic counselor can help you interpret these results in the context of your personal and family medical history. They are the best resources for understanding what this means for your health and for discussing any necessary clinical follow-up or monitoring that may be appropriate for your specific situation.
How common is this variant?
The rs121964879 variant is rare across all major ancestral populations, appearing infrequently in large-scale genomic databases.
Frequently asked questions
What is distal renal tubular acidosis?
Distal renal tubular acidosis is a medical condition where the kidneys fail to properly excrete acid into the urine. This leads to an accumulation of acid in the blood, which can cause various health issues, including bone problems and kidney stones.
Is rs121964879 a common genetic variant?
No, rs121964879 is considered a rare variant. It is not commonly found in the general population and is typically identified in clinical settings.
Can I use this information to diagnose myself?
No, you cannot use genetic information to diagnose yourself. Genetic results must be interpreted by a medical professional who can consider your full clinical history and physical symptoms.
Where can I find more information about this variant?
You can look up the variant in databases like ClinVar or the NCBI SNP database. These resources provide professional-grade information on the clinical significance and research history of specific genetic variants.
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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