COL5A1 rs1536482: What Your Genotype Means
The rs1536482 variant is a common genetic change located within the COL5A1 gene. It has been identified in scientific studies as being associated with variations in central corneal thickness and potential susceptibility to keratoconus.
What each genotype means
Associated with thinner corneas
Research indicates that the A allele at this position is associated with variations in central corneal thickness. While this variant is linked to corneal structure, it is not a diagnostic indicator for keratoconus, and individual risk is influenced by many other genetic and environmental factors.
This genotype is common, appearing in a significant portion of the global population.
Intermediate corneal thickness profile
This heterozygous genotype represents a mix of the two common alleles associated with central corneal thickness. Studies suggest that the influence of this variant on corneal structure is complex, and having one copy of each allele does not imply a specific clinical outcome or disease state.
This is a frequently observed genotype across diverse ancestral groups.
Associated with thicker corneas
The G allele is statistically associated with variations in central corneal thickness compared to the A allele. This association is part of a broader understanding of how the COL5A1 gene contributes to extracellular matrix regulation in the eye, though it does not determine individual eye health on its own.
This genotype is found at a frequency consistent with the common distribution of the G allele globally.
Understanding the rs1536482 Variant
The rs1536482 variant is a single nucleotide polymorphism, or SNP, located on chromosome 9. In the context of human genetics, a SNP represents a variation at a single position in the DNA sequence. This specific variant is situated within the COL5A1 gene, which provides instructions for making a component of type V collagen. Collagen is a structural protein that provides strength and support to many tissues in the body, including the cornea, which is the clear front surface of the eye. Because this variant is located in an intronic region—a part of the gene that does not code for the final protein—it is often studied for its potential role in regulating how the gene is expressed or turned on and off. Researchers use these markers to understand how subtle differences in our genetic code might influence physical traits or the risk of developing certain conditions over time.
The Role of the COL5A1 Gene
The COL5A1 gene is essential for the production of type V collagen. This protein is a critical building block for connective tissues, which act as the scaffolding for the body. In the eye, type V collagen is particularly important for maintaining the structural integrity and transparency of the cornea. Mutations in the COL5A1 gene are well-known for their role in classical Ehlers-Danlos syndrome, a group of disorders that affect connective tissues, often leading to joint hypermobility and skin fragility. While the rs1536482 variant is not a disease-causing mutation in the same sense as those that cause Ehlers-Danlos, it is a common regulatory variant. By influencing the expression of collagen, this variant may contribute to the natural variation in corneal thickness observed across the human population. Understanding this gene helps scientists map the complex relationship between structural proteins and the physical characteristics of the eye.
Research Associations and Evidence Strength
Scientific research, including genome-wide association studies (GWAS), has linked rs1536482 to variations in central corneal thickness. Central corneal thickness is a measurable trait that can influence the risk of eye conditions such as glaucoma and keratoconus, a condition where the cornea thins and bulges into a cone shape. While the association between this SNP and corneal traits has been reported in large-scale studies, the evidence strength remains limited regarding its direct clinical impact on an individual. It is important to note that genetic associations are statistical in nature; they describe patterns observed in large groups of people rather than predicting a specific health outcome for any one person. Many factors, including other genetic variants and environmental influences, contribute to the development of eye conditions. Therefore, this variant should be viewed as one small piece of a much larger, complex biological puzzle rather than a definitive diagnostic tool.
What You Can and Cannot Do With This Information
If you have information about your genotype for rs1536482, it is important to understand its limitations. This data is primarily for educational purposes and does not constitute a medical diagnosis or a prediction of future eye health. You cannot use this information to determine if you will develop keratoconus or any other eye condition. Because the evidence linking this variant to clinical outcomes is limited, it is not currently used in routine clinical practice to guide medical decisions. If you have concerns about your vision, the health of your corneas, or a family history of eye disease, the most appropriate step is to consult with an eye care professional, such as an optometrist or ophthalmologist. They can perform clinical examinations and provide personalized advice based on your actual eye health, which is far more informative than any single genetic marker.
How common is this variant?
The rs1536482 variant is common, with a minor allele frequency typically ranging between 0.35 and 0.45 across diverse global populations.
Frequently asked questions
Is rs1536482 a cause of keratoconus?
No, rs1536482 is not considered a direct cause of keratoconus. It is a genetic variant associated with variations in corneal thickness, which is a trait that may be linked to the condition in some research studies.
Should I be worried if I have the G/G genotype?
There is no reason for concern based on this genotype alone. Genetic associations are statistical observations in large groups and do not predict individual health outcomes or disease risk.
Can this SNP tell me if I need glasses?
No, this SNP cannot predict your need for glasses or your refractive error. Vision needs are determined by many complex factors, and you should rely on a professional eye exam for vision care.
Where can I find more information about my eye health?
For reliable information regarding your eye health, you should consult an ophthalmologist or optometrist. They can provide comprehensive exams and answer questions specific to your medical history.
Sources & further reading
Educational information only, last refreshed 9/16/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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COL5A1 locus variant robustly associated across multiple genome-wide scans with decreased central corneal thickness and corneal biomechanical risk.
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This variant is associated with joint hypermobility and susceptibility to hypermobile Ehlers-Danlos Syndrome.
This variant in the collagen type V alpha 1 chain gene is associated with structural skin integrity and connective tissue properties.