COL11A1 rs1502593: Eye Anatomy and Axial Length
The genetic variant rs1502593 is a single-nucleotide polymorphism located in the region of the COL11A1 gene. Research has highlighted this site as a lead regulatory variant associated with variation in ocular axial length and related age-associated vision traits. Having a specific allele does not determine eye disease, but it provides insight into subtle structural variations in collagen and eye shape.
What each genotype means
Typical risk profile
You carry two copies of the common C allele at rs1502593. In genome-wide association studies, this baseline genotype is not associated with elevated genetic susceptibility to age-related ocular phenotypes or altered axial length. It reflects the standard population risk for vision-related traits linked to this locus.
Carried by approximately 65% to 70% of individuals globally, and by roughly 55% to 60% of individuals of East Asian ancestry.
Modestly increased susceptibility
You carry one copy of the T effect allele and one copy of the C allele. Research links the T allele to slight variations in ocular axial length and modest susceptibility to shared age-related ocular conditions. Having one copy confers a small statistical shift in risk rather than a deterministic outcome.
Carried by roughly 25% to 30% of individuals worldwide, and by approximately 35% to 40% of people of East Asian ancestry.
Elevated susceptibility profile
You carry two copies of the T effect allele at rs1502593. Published studies identify this genotype as being associated with greater susceptibility to shared age-related ocular phenotypes and axial length variation compared to the baseline genotype. Because these are complex multifactorial traits, lifestyle factors, regular eye exams, and overall ocular health play major contributing roles alongside genetic variation.
Carried by roughly 3% to 4% of individuals globally, but found in approximately 6% to 8% of individuals of East Asian descent.
Genetic Location and Nature of rs1502593
The single-nucleotide polymorphism rs1502593 represents a common C-to-T base substitution mapped to human chromosome 1. It is situated within the genomic territory encompassing the COL11A1 locus, which encodes collagen type XI alpha 1. Rather than fundamentally breaking a protein sequence, rs1502593 is primarily characterized as a non-coding or regulatory single-nucleotide polymorphism. Such regulatory variants generally act by subtly tuning gene expression levels, altering chromatin accessibility, or influencing regional transcription across ocular tissues. Genome-wide association analyses frequently utilize tag SNPs like rs1502593 to pinpoint broader chromosomal regions linked to physiological traits. Because it acts as a marker for a tightly linked haplotype block, rs1502593 serves as an informative signpost for studying how common variations in structural collagen genes correlate with anatomical ocular phenotypes across diverse human populations.
The Biological Role of COL11A1
The COL11A1 gene provides instructions for producing the alpha-1 chain of type XI collagen, an essential minor fibrillar collagen. Type XI collagen plays a crucial structural role during embryonic development and mature tissue maintenance, particularly by regulating the diameter and spacing of type II collagen fibrils. In the eye, these collagen networks form the structural backbone of the vitreous humor and contribute to the mechanical stability of the sclera, which is the tough outer white layer of the eyeball. Rare, high-impact pathogenic mutations in COL11A1 disrupt these collagen fibrils dramatically, leading to monogenic disorders such as type II Stickler syndrome and fibrochondrogenesis, which feature high myopia, retinal detachment risk, and vitreous anomalies. Common variants within the same locus, by contrast, exert subtle regulatory shifts in fibril architecture rather than causing severe syndromic damage.
Axial Length and Vision Traits: What the Research Shows
Genome-wide association studies (GWAS) have evaluated rs1502593 as a pleiotropic lead variant associated with ocular dimensions, most notably axial length. Axial length refers to the anterior-to-posterior measurement of the eye from the front of the cornea to the back of the retina. Elongation of this axis is the primary anatomical driver of axial myopia (nearsightedness), which in turn alters the risk profile for secondary age-related ocular phenotypes such as myopic maculopathy and glaucoma. In population-scale genetic screens, rs1502593 shows moderate statistical evidence for influencing these eye measurements. It is important to emphasize that rs1502593 confers modest statistical susceptibility rather than deterministic disease outcomes. Environmental factors, visual habits, and thousands of other common genetic loci collectively interact with COL11A1 variation to shape an individual's overall refractive error and eye development.
Population Frequency and Ancestry Patterns
The distribution of rs1502593 alleles varies across world populations. The minor allele (T) has an estimated global minor allele frequency of approximately 18% across large reference databases such as the 1000 Genomes Project and gnomAD. However, this frequency is notably elevated in East Asian ancestry groups, where the minor allele frequency reaches approximately 25%. In contrast, European and American reference groups demonstrate slightly lower frequencies. Because the background genetic architecture and environmental exposures—such as time spent outdoors during childhood—differ substantially across global regions, the relative contribution of rs1502593 to ocular biometric measurements must be interpreted strictly within ancestral and multi-factorial contexts rather than generalized as an absolute risk factor.
Understanding What Your Result Means
Receiving a consumer genetic test that includes rs1502593 can offer interesting insights into polygenic ocular traits, but it carries clear clinical limitations. Having one or two copies of the susceptibility allele is not a medical diagnosis of myopia, glaucoma, or any hereditary connective tissue disorder. Common variants like rs1502593 only explain a very small fraction of individual phenotypic variance. Individuals cannot change their inherited genotypes, nor should they use these results to make unilateral decisions about vision correction or eye therapies. The best application of this genetic data is simply recognizing the natural biological diversity of connective tissue architecture and maintaining proactive, standard vision care, such as scheduling comprehensive dilated eye examinations with an optometrist or ophthalmologist.
How common is this variant?
The minor T allele occurs at an estimated frequency of approximately 18% globally, but is more common in East Asian populations where its frequency reaches around 25%.
Frequently asked questions
Does carrying the rs1502593 variant mean I will develop severe nearsightedness?
No. The rs1502593 variant is a common genetic marker with a modest statistical influence on eye dimensions such as axial length. Refractive errors like nearsightedness depend on hundreds of interacting genes along with environmental factors like screen time and outdoor light exposure.
Is the COL11A1 rs1502593 variant related to Stickler syndrome?
While severe, rare mutations in the COL11A1 gene can cause Stickler syndrome type II, rs1502593 is merely a benign, common regulatory single-nucleotide polymorphism. It does not cause Stickler syndrome or other severe monogenic connective tissue diseases.
Can I prevent eye changes associated with this genetic variant?
You cannot alter your inherited DNA, but you can protect your vision through lifestyle and routine healthcare. Maintaining healthy visual habits, taking regular screen breaks, spending time outdoors in daylight, and attending routine comprehensive eye exams are proven strategies for ocular health.
Why is the COL11A1 gene important for vision?
COL11A1 provides instructions for making type XI collagen, which forms structural support networks in the eye's vitreous body and outer sclera. Variations in these collagen scaffolds can subtly influence the physical dimensions and structural tension of the eyeball.
Sources & further reading
Educational information only, last refreshed 9/12/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Intronic collagen gene polymorphism associated with corneal curvature variation and susceptibility to severe myopia.
Significantly associated with increased risk of lumbar disc herniation and intervertebral disc degeneration.
A pathogenic glycine substitution causing type II Stickler syndrome characterized by high myopia, vitreoretinal degeneration, and retinal detachment.
This variant in the type XI collagen alpha 1 gene is strongly associated with susceptibility to primary angle-closure glaucoma.