RP1 rs104894487: Understanding the p.Arg677Ter Variant
The rs104894487 variant is a well-characterized nonsense mutation in the RP1 gene, specifically known as p.Arg677Ter. It is associated with autosomal dominant retinitis pigmentosa, a condition that leads to progressive night blindness and the constriction of visual fields.
What each genotype means
Typical RP1 gene profile
This genotype represents the common, non-mutated sequence for this position in the RP1 gene. Individuals with this profile do not carry the specific p.Arg677Ter nonsense mutation associated with autosomal dominant retinitis pigmentosa.
This is the most common genotype found in the general population.
Pathogenic RP1 variant carrier
This genotype includes the p.Arg677Ter nonsense mutation, which is a well-characterized cause of autosomal dominant retinitis pigmentosa. This condition is associated with progressive night blindness and visual field constriction, and individuals with this finding should consult with a clinical geneticist or ophthalmologist for appropriate evaluation.
This variant is extremely rare, with a global minor allele frequency of less than 0.0001 in population databases.
Pathogenic RP1 variant homozygous
This genotype indicates the presence of the p.Arg677Ter mutation on both copies of the RP1 gene. Because this variant is typically associated with an autosomal dominant inheritance pattern, this profile is expected to be associated with the clinical features of retinitis pigmentosa, such as progressive vision loss. Please discuss these results with a medical professional to understand the clinical implications for your health.
This genotype is exceptionally rare and has not been widely documented in general population cohorts.
What is the rs104894487 Variant?
The rs104894487 variant is a specific genetic change located within the RP1 gene on chromosome 8. In scientific literature, this variant is frequently referred to as p.Arg677Ter, which describes a 'nonsense' mutation. A nonsense mutation occurs when a single DNA base change creates a premature stop signal in the genetic code. This signal tells the cell to stop building the protein prematurely, resulting in a truncated, or shortened, version of the RP1 protein. Because the protein is incomplete, it cannot function as intended within the eye. This specific variant has been identified in multiple clinical cohorts and is recognized as a significant genetic factor in the development of certain forms of retinal degeneration.
The Role of the RP1 Gene
The RP1 gene provides instructions for creating a protein that is essential for the health and function of photoreceptor cells in the retina. These cells, known as rods and cones, are responsible for capturing light and converting it into electrical signals that the brain interprets as vision. The RP1 protein is a microtubule-associated protein that plays a critical role in the structure of the photoreceptor outer segment, which is the part of the cell where light detection occurs. Specifically, it helps regulate the transport of proteins like rhodopsin and ensures the correct stacking of the discs that contain light-sensitive pigments. When the RP1 gene is mutated, these structural processes are disrupted, leading to the gradual death of photoreceptor cells and the characteristic symptoms of retinitis pigmentosa.
Research and Clinical Associations
Research has consistently associated the p.Arg677Ter mutation with autosomal dominant retinitis pigmentosa (adRP). Studies indicate that individuals carrying this variant often experience rod dysfunction as an early sign of the disease, which can be detected through electroretinography (ERG) even before significant vision loss is apparent. The clinical presentation can vary, with some individuals showing regional retinal differences in disease severity. Interestingly, some individuals who carry the mutation may show minimal or no disease expression, suggesting that other genetic modifiers or environmental factors may influence how the condition manifests. While the evidence linking this specific variant to adRP is strong within clinical genetics, it is important to note that retinitis pigmentosa is a genetically heterogeneous condition, meaning many different genes can cause similar symptoms.
Population Frequency
The rs104894487 variant is considered rare in the general population. According to data from the Genome Aggregation Database (gnomAD), the global minor allele frequency is less than 0.0001. It has been predominantly identified in European clinical cohorts, where it has been studied as a known cause of adRP. Because the variant is so rare, it is not typically found in the general population at high frequencies. Its presence is usually identified through clinical genetic testing in families or individuals already presenting with symptoms of retinal degeneration. The rarity of this variant underscores the importance of specialized genetic counseling for those who receive a positive result, as it helps clarify the specific genetic cause of their condition.
Navigating Genetic Information
If you or a family member have been identified as a carrier of the rs104894487 variant, it is essential to consult with a medical geneticist or an ophthalmologist specializing in retinal diseases. This information is intended for educational purposes and should not be used to diagnose or treat any medical condition. Genetic testing results can be complex, and a professional can help interpret what this means for your specific health profile and family history. While there is ongoing research into treatments for retinitis pigmentosa, including clinical trials for various therapies, there is currently no universal cure. Discussing your results with a clinician allows you to stay informed about the latest management strategies, potential clinical trials, and supportive care options tailored to your specific needs.
How common is this variant?
The rs104894487 variant is very rare, with a global minor allele frequency of less than 0.0001 in gnomAD, and is primarily identified in European clinical cohorts.
Frequently asked questions
What is the clinical significance of the RP1 p.Arg677Ter variant?
This variant is a known cause of autosomal dominant retinitis pigmentosa. It leads to the production of a shortened, non-functional protein that disrupts the health of retinal photoreceptor cells.
Can I be tested for the rs104894487 variant?
Yes, this variant can be identified through clinical genetic testing. You should discuss the necessity and implications of such testing with a genetic counselor or an eye specialist.
Is there a cure for retinitis pigmentosa caused by RP1 mutations?
Currently, there is no cure for retinitis pigmentosa. However, research is ongoing, and clinical trials are exploring various therapeutic approaches to manage or slow the progression of the disease.
Does having this variant guarantee I will go blind?
While this variant is associated with progressive vision loss, the rate and severity of the disease can vary significantly between individuals. Factors such as genetic modifiers and environmental influences may play a role in how the condition progresses.
Sources & further reading
Educational information only, last refreshed 9/17/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Pathogenic variants in the RP1 gene are a well-established cause of autosomal dominant retinitis pigmentosa, leading to progressive photoreceptor degeneration and vision loss.
Carries the Arg677STOP truncating mutation in RP1, accounting for up to 5% of autosomal dominant retinitis pigmentosa in European-derived populations.
Pathogenic nonsense truncating mutation (p.Arg677Ter) causing autosomal dominant retinitis pigmentosa.
A well-characterized missense substitution in RP1 implicated in inherited retinal degeneration and forms of retinitis pigmentosa.
Well-characterized nonsense/truncating variant in RP1 linked to autosomal dominant retinitis pigmentosa.
This variant in the RP1 gene is associated with autosomal dominant retinitis pigmentosa, causing progressive night blindness and peripheral field loss.