CFB rs641153: Understanding Your Genetic Variant and Eye Health
The rs641153 variant is a specific change in the CFB gene that has been widely studied for its role in eye health. Research consistently indicates that this variant is associated with a protective effect against the development of age-related macular degeneration (AMD).
What each genotype means
Baseline risk profile
This genotype represents the common form of the CFB gene at this position. Research indicates that individuals with this genotype do not receive the protective benefit against age-related macular degeneration (AMD) associated with the alternative allele.
This is the most common genotype in many populations, including those of European ancestry.
Reduced AMD risk
Carrying one copy of the A allele is associated with a protective effect against the development of age-related macular degeneration. This variant, often referred to as the R32Q polymorphism, may influence complement system activity, which is involved in the progression of retinal health conditions.
This heterozygous genotype is found in a significant portion of the population, with the minor allele frequency typically ranging between 0.05 and 0.10 in European groups.
Enhanced protective profile
Individuals with this genotype carry two copies of the protective A allele, which has been consistently linked to a reduced risk of developing age-related macular degeneration in various studies. This variant is thought to modulate complement pathway activation, potentially lowering the risk of late-stage AMD.
This homozygous genotype is less common than the C/C or C/A genotypes, occurring in a smaller percentage of the population.
What is rs641153?
The variant rs641153 is a single nucleotide polymorphism (SNP) located within the CFB gene on chromosome 6. In genetic terms, this SNP represents a specific position where individuals may carry different DNA letters, typically a cytosine (C) or a thymine (T). This specific change results in a missense mutation, meaning it alters the amino acid sequence of the protein produced by the gene, specifically changing arginine to glutamine at position 32 (p.Arg32Gln). Because this change occurs in a gene critical to the body's immune response, researchers have spent significant effort investigating how this structural alteration might influence biological function and disease susceptibility. It is categorized as a missense variant, and its presence is tracked in major genomic databases like dbSNP and gnomAD to help scientists understand its distribution and potential impact on human health across different global populations.
The Role of the CFB Gene
The CFB gene provides instructions for making a protein called complement factor B. This protein is a vital component of the alternative pathway of the complement system, which is a part of the body's innate immune system. The complement system helps the body identify and clear pathogens, clear cellular debris, and regulate inflammation. When the complement system is functioning correctly, it protects the body from infection. However, when it becomes overactive or dysregulated, it can cause damage to healthy tissues. In the context of the eye, the complement system is highly active. Dysregulation of this system is a well-established factor in the development and progression of age-related macular degeneration (AMD), a condition that affects the central part of the retina. By studying variants like rs641153, researchers aim to understand how subtle changes in complement proteins might tip the balance between healthy immune regulation and the chronic inflammation associated with vision loss.
Research and Evidence Strength
The association between rs641153 and age-related macular degeneration is supported by moderate to strong evidence from numerous genetic studies and meta-analyses. Multiple independent research groups have observed that the T allele of this variant is associated with a reduced risk of developing AMD compared to the C allele. This protective effect has been documented in both Caucasian and Asian populations, suggesting that the biological mechanism may be consistent across different ancestries. While the evidence is robust enough to establish a statistical link, it is important to note that AMD is a complex, multifactorial disease. Genetics is only one piece of the puzzle; environmental factors, such as smoking, diet, and age, play significant roles in disease onset. Therefore, while this variant is a valuable marker for researchers studying the complement system, it does not act as a sole predictor of eye health, and its presence does not guarantee immunity from eye conditions.
What You Can Do With This Information
Understanding your genetic profile regarding rs641153 can be an interesting way to learn about your biological predispositions, but it is not a diagnostic tool. Because AMD is influenced by a combination of genetic, lifestyle, and environmental factors, knowing your genotype for this variant does not replace the need for regular, professional eye examinations. If you are concerned about your risk for macular degeneration, the most effective action is to schedule a comprehensive eye exam with an optometrist or ophthalmologist. They can assess your current eye health and provide personalized advice based on your clinical history and lifestyle. Avoid making health decisions based solely on genetic data. If you have questions about how your genetic results might relate to your overall health, discuss them with a qualified healthcare provider or a genetic counselor who can help interpret the information within the context of your complete medical profile.
How common is this variant?
The minor allele frequency for the T allele of rs641153 is approximately 0.05 to 0.10 in European populations, making it a relatively common variant.
Frequently asked questions
Does having the T allele mean I will never get AMD?
No. While the T allele is associated with a lower risk of developing AMD, it does not provide complete immunity. AMD is a complex disease influenced by many genetic and environmental factors.
Should I change my diet based on this result?
There is no specific diet recommended based solely on this genetic variant. You should focus on general eye-healthy habits, such as eating a balanced diet rich in leafy greens and avoiding smoking, and consult your doctor for personalized advice.
Is this variant used for medical diagnosis?
No, this variant is not used for clinical diagnosis. It is a research-based marker used to study the biological pathways involved in eye health and is not a substitute for a clinical eye exam.
Where can I find more information about my eye health?
The best source for information about your eye health is a licensed eye care professional. They can perform tests that are far more accurate for assessing your risk than genetic testing alone.
Sources & further reading
Educational information only, last refreshed 9/22/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs641153?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29