PKHD1 rs189345248: What Your Genotype Means
The genetic variant rs189345248 is located within the PKHD1 gene, which is essential for normal kidney and liver development. This specific variant is associated with carrier status for autosomal recessive polycystic kidney disease (ARPKD), a rare genetic condition.
What each genotype means
Typical genetic profile
This genotype represents the most common sequence found at this position in the PKHD1 gene. It is not associated with the development of autosomal recessive polycystic kidney disease.
This is the most common genotype observed across all major global populations.
Potential carrier status
This genotype indicates you carry one copy of the variant, which is associated with carrier status for autosomal recessive polycystic kidney disease. Being a carrier typically does not cause symptoms, but you should discuss the implications for family planning with a genetic counselor or healthcare provider.
This genotype is rare and occurs at a very low frequency in the general population.
Increased clinical risk
This genotype indicates you carry two copies of the variant, which may be associated with the clinical features of autosomal recessive polycystic kidney disease. Because this condition involves complex inheritance and clinical presentation, you should consult with a nephrologist or medical geneticist to discuss your specific health status.
This genotype is extremely rare in the general population.
Understanding the SNP and Its Location
The variant rs189345248 is a single nucleotide polymorphism (SNP) situated on chromosome 6 at position 52,071,016. It resides within the PKHD1 gene, which stands for Polycystic Kidney and Hepatic Disease 1. This gene is notably large and complex, spanning a significant portion of the genome and containing 86 exons. Because of its size, the gene is responsible for producing a massive protein known as fibrocystin or polyductin. When a SNP occurs in such a critical gene, it can potentially alter the structure or function of the resulting protein. Researchers track these specific locations to understand how minor changes in the DNA sequence can contribute to the development of rare, inherited disorders. By identifying the exact position of rs189345248, scientists can better study its impact on cellular processes and its role in clinical health.
The Role of the PKHD1 Gene
The PKHD1 gene provides instructions for making a protein called fibrocystin, which is primarily found in the cilia of cells lining the kidney tubules and the bile ducts in the liver. Cilia are tiny, hair-like structures that act as sensory antennae, helping cells sense their environment and communicate with neighboring cells. In the kidneys, this protein is vital for maintaining the proper structure and function of the renal tubules. When the PKHD1 gene is mutated, the resulting fibrocystin protein may be non-functional or absent, leading to the formation of fluid-filled cysts. These cysts can disrupt normal organ function, which is the hallmark of autosomal recessive polycystic kidney disease (ARPKD). Understanding this gene is crucial because it helps explain why mutations in this specific region lead to the characteristic renal and hepatic issues observed in affected individuals.
Research and Clinical Associations
Research has established that biallelic mutations in the PKHD1 gene—meaning a mutation is present on both copies of the gene—are the primary cause of ARPKD. The variant rs189345248 is identified in genetic databases as being associated with carrier status for this condition. Being a carrier means an individual has one copy of a pathogenic variant but typically does not exhibit the symptoms of the disease, as the other copy of the gene is usually functional. The evidence strength for this association is considered moderate, reflecting that while the link is recognized, clinical interpretation of individual variants in such a large gene requires careful analysis. It is important to note that the presence of a single variant does not equate to a diagnosis of ARPKD, as the condition follows an autosomal recessive inheritance pattern, requiring two pathogenic variants to manifest the clinical phenotype.
Population Frequency and Prevalence
The variant rs189345248 is classified as rare across most human populations. Because ARPKD itself is a rare disorder, occurring in approximately 1 in 20,000 live births, the specific genetic variants that cause it are also found at low frequencies in the general population. Genetic studies, such as those using data from gnomAD, help researchers estimate how often these variants appear in different ancestral groups. Because the frequency is low, it is uncommon for individuals to carry this specific variant unless they have a family history of the condition. If you have received information about this variant through genetic testing, it is helpful to remember that rare variants are often specific to certain lineages or families. Population-level data provides context, but individual risk is best assessed through clinical genetic counseling that considers personal and family health history.
Interpreting Your Genetic Information
If you have identified that you carry the rs189345248 variant, it is important to understand what this means in a practical sense. This information is primarily used for carrier screening, which helps individuals understand the risk of passing a genetic condition to their children. It is not a medical diagnosis and does not indicate that you have or will develop polycystic kidney disease. Because genetic testing can be complex, the most appropriate step is to discuss these results with a qualified healthcare provider or a genetic counselor. They can help interpret the findings in the context of your overall health and family history. You should never use this information to make medical decisions or change your health habits without professional guidance. A clinician can provide the necessary context to determine if further testing, such as partner screening, is appropriate for your specific situation.
How common is this variant?
The variant rs189345248 is considered rare in the general population, with its frequency varying across different ancestral groups.
Frequently asked questions
What is a carrier of a genetic disease?
A carrier is an individual who has one copy of a gene mutation but does not show symptoms of the disease. They can, however, pass this mutation on to their children.
Does having this variant mean I have kidney disease?
No, carrying one copy of this variant does not mean you have autosomal recessive polycystic kidney disease. This condition is recessive, meaning it typically requires two copies of a mutation to manifest.
Should I be worried if I have this variant?
Finding a carrier variant is common and does not necessarily indicate a health problem. You should discuss the result with a genetic counselor to understand your specific risks and family planning options.
How is ARPKD inherited?
ARPKD is inherited in an autosomal recessive pattern. This means a child must inherit one pathogenic variant from each parent to be affected by the condition.
Sources & further reading
Educational information only, last refreshed 9/30/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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