RP1 rs61751240: Understanding the Arg677STOP Variant
The rs61751240 variant in the RP1 gene is a specific genetic change known as the Arg677STOP mutation. It is associated with autosomal dominant retinitis pigmentosa, a condition characterized by the progressive degeneration of retinal photoreceptor cells.
What each genotype means
Typical risk profile
You carry two reference copies of the RP1 gene and do not harbor the Arg677Ter premature stop mutation. In scientific research, this genotype is the standard wild-type sequence and is not linked to autosomal dominant retinitis pigmentosa. Your risk of developing retinal degeneration related to this specific locus remains typical of the general population.
Carried by over 99.9% of individuals across European, African, Asian, and other global populations.
Elevated retinitis pigmentosa risk
You carry one copy of the Arg677Ter nonsense mutation in the RP1 gene. In clinical studies, this truncating variant is strongly associated with autosomal dominant retinitis pigmentosa, often presenting as night blindness and progressive peripheral visual field constriction. However, clinical presentation can vary widely between individuals, and some carriers experience slower progression or incomplete penetrance.
Found in approximately 1 in 1,000 to 1 in 2,000 individuals of European ancestry (minor allele frequency ~0.05%) and is exceptionally rare in non-European ancestries.
Severe retinal dystrophy risk
You carry two copies of the Arg677Ter truncating mutation in RP1. Because a single copy is typically sufficient to cause autosomal dominant retinal degeneration, carrying two mutated copies is expected to cause severe photoreceptor dysfunction with early visual impairment. Published homozygous individuals for this specific mutation are virtually absent from clinical registries and population databases.
Extremely rare globally, estimated at less than 1 in 1,000,000 individuals across all populations.
What is the rs61751240 Variant?
The rs61751240 variant is a specific change in the DNA sequence of the RP1 gene, located on chromosome 8. In scientific literature, this variant is frequently referred to as the Arg677STOP or Arg677X mutation. This notation indicates that a single nucleotide change results in a premature stop codon at position 677 of the protein sequence. Instead of producing a full-length protein, the cellular machinery stops translation early, leading to a truncated, or shortened, version of the RP1 protein. This type of mutation is often referred to as a nonsense mutation. Because the RP1 protein is essential for the structural integrity of photoreceptor cells in the eye, the production of a non-functional or truncated protein can disrupt normal cellular processes. Researchers study this variant to understand how such structural changes at the molecular level contribute to the development of inherited retinal diseases.
The Role of the RP1 Gene
The RP1 gene provides instructions for making a protein that is primarily found in the connecting cilia of rod and cone photoreceptors in the retina. These photoreceptors are the specialized cells in the eye that detect light and convert it into electrical signals for the brain. The RP1 protein is a microtubule-associated protein, meaning it helps organize and stabilize the microtubule structures within these cells. These microtubules are vital for the transport of materials and the overall structural maintenance of the photoreceptor outer segments. When the RP1 gene is mutated, the resulting protein may fail to perform these critical tasks. This dysfunction can lead to the gradual death of photoreceptor cells, which manifests as the progressive vision loss observed in retinitis pigmentosa. Because the retina relies heavily on these precise structural components, even small changes in the RP1 protein can have significant impacts on long-term visual health.
Research and Clinical Associations
Research has established an association between the Arg677STOP mutation and autosomal dominant retinitis pigmentosa. Studies have identified this specific variant in several unrelated families affected by the condition. The evidence suggests that this mutation is a significant contributor to the genetic burden of retinitis pigmentosa in certain populations, with some estimates suggesting it may account for a notable percentage of autosomal dominant cases in European-derived groups. However, it is important to note that retinitis pigmentosa is a genetically heterogeneous condition, meaning it can be caused by mutations in many different genes. While the association between rs61751240 and the disease is documented, the clinical expression can vary between individuals, even within the same family. Some individuals carrying the mutation may experience more severe symptoms than others, and the presence of the variant does not guarantee a specific clinical outcome or rate of progression.
Understanding Your Genetic Information
Genetic information regarding variants like rs61751240 is intended for educational purposes and should not be used for self-diagnosis or medical decision-making. If you have concerns about your vision or a family history of retinal disease, it is essential to consult with a qualified healthcare professional, such as an ophthalmologist or a genetic counselor. They can provide appropriate clinical evaluations, such as electroretinograms or formal genetic testing, which are necessary to understand the specific cause of any visual symptoms. Genetic testing results should always be interpreted in the context of a comprehensive clinical examination. Because the field of genomics is rapidly evolving, new research may further clarify the role of specific variants over time. Always rely on personalized advice from your medical team rather than general information found online, as they can provide guidance tailored to your specific health history and clinical needs.
How common is this variant?
The minor allele frequency for rs61751240 is approximately 0.05% in European ancestral groups, making it a rare variant in the general population.
Frequently asked questions
What is retinitis pigmentosa?
Retinitis pigmentosa is a group of rare, genetic disorders that involve a breakdown and loss of cells in the retina. It typically causes night blindness and a gradual loss of side vision.
Is the rs61751240 variant the only cause of retinitis pigmentosa?
No, retinitis pigmentosa is genetically heterogeneous, meaning it can be caused by mutations in many different genes. The rs61751240 variant is just one of many known genetic factors associated with the condition.
Can I be tested for this variant?
Yes, clinical genetic testing can identify this variant. You should discuss the necessity and implications of such testing with a genetic counselor or an eye specialist.
What should I do if I have a family history of vision loss?
If you have a family history of retinal disease, you should schedule an appointment with an ophthalmologist. They can perform a clinical exam and discuss whether genetic counseling or testing is appropriate for you.
Sources & further reading
Educational information only, last refreshed 10/10/2026. 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.
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.
A nonsense variant (p.Arg677Ter) in RP1 causing 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.