IGF1 rs6214: What Your Genotype Means
The rs6214 variant is a single nucleotide polymorphism located within the IGF1 gene, which encodes a protein essential for growth and development. Research has investigated its potential association with high-grade myopia, a condition involving the elongation of the eye's axial length.
What each genotype means
Typical IGF1 expression profile
This genotype represents the major allele combination often used as a baseline in studies of the IGF1 gene. Research into the association between this variant and high-grade myopia has yielded mixed results across different ethnic populations, meaning this genotype does not definitively predict ocular growth outcomes.
Carried by approximately 36% of individuals in European populations, based on a minor allele frequency of roughly 0.40.
Intermediate IGF1 variant profile
Carrying one copy of each allele places you in an intermediate category for this genetic marker. While some studies have linked IGF1 variants to ocular axial elongation and high myopia, these findings are not consistent across all global populations and should be interpreted as one small factor among many environmental and genetic influences on vision.
Carried by approximately 48% of individuals in European populations, based on a minor allele frequency of roughly 0.40.
Associated with potential ocular elongation
This genotype contains two copies of the minor allele, which has been investigated for its potential role in ocular axial growth and high-grade myopia. Because evidence for this association is mixed and varies significantly by ancestry, this result should not be viewed as a diagnostic indicator for vision health.
Carried by approximately 16% of individuals in European populations, based on a minor allele frequency of roughly 0.40.
Understanding the rs6214 Variant
The rs6214 variant is a specific genetic marker located within the IGF1 gene on chromosome 12. In genetics, a single nucleotide polymorphism (SNP) like rs6214 represents a variation at a single position in the DNA sequence. Scientists study these variations to understand how subtle differences in our genetic code might influence physical traits or susceptibility to certain conditions. Because rs6214 is located in a region associated with the regulation of the IGF1 gene, researchers have hypothesized that it may influence how much of the IGF-1 protein is produced or how it functions within ocular tissues. It is important to note that most common genetic variants have very small individual effects on complex traits, and the presence of a specific allele does not guarantee the development of any particular condition.
The Role of the IGF1 Gene
The IGF1 gene provides instructions for making a protein called insulin-like growth factor 1. This protein acts as a signaling molecule that promotes cell growth, proliferation, and survival throughout the body. In the context of the eye, IGF-1 is believed to play a significant role in the process of emmetropization, which is the mechanism by which the eye adjusts its growth to achieve clear vision. If this growth process is disrupted, it can lead to axial elongation, where the eyeball becomes too long from front to back. This elongation is a primary characteristic of high-grade myopia. By studying variants like rs6214, scientists aim to better understand the molecular pathways that govern eye development and how variations in these pathways might contribute to refractive errors.
Research and Evidence Strength
The evidence linking rs6214 to high-grade myopia is considered moderate and has been the subject of several studies with varying results. Some research, particularly in East Asian populations, has identified associations between specific IGF1 haplotypes—which include rs6214—and an increased susceptibility to high myopia. However, other studies, such as those conducted in European cohorts, have not always replicated these findings, suggesting that the influence of this variant may be dependent on genetic background or environmental factors. Because myopia is a complex, polygenic trait influenced by many genes and lifestyle factors, it is difficult to isolate the effect of a single SNP. Current scientific consensus suggests that while IGF1 is a plausible candidate gene for ocular growth, the clinical significance of the rs6214 variant remains an area of ongoing investigation rather than a definitive diagnostic marker.
Interpreting Your Genetic Information
Genetic information regarding variants like rs6214 should be viewed as a piece of a much larger puzzle. Because the association between this variant and myopia is not absolute, it cannot be used to predict whether an individual will develop high-grade myopia. If you are concerned about your vision or the risk of myopia, it is essential to consult with an optometrist or ophthalmologist for a comprehensive eye examination. These professionals can provide accurate assessments based on clinical measurements rather than genetic markers. You should never use genetic test results to make medical decisions or to self-diagnose. Always discuss any concerns about your eye health or family history of vision problems with a qualified healthcare provider who can offer personalized guidance based on your specific clinical needs.
How common is this variant?
The minor allele frequency for rs6214 is approximately 0.40 in European populations and 0.48 in East Asian populations, indicating that both alleles are relatively common.
Frequently asked questions
Does having the rs6214 variant mean I will have high myopia?
No. Genetic variants like rs6214 are associated with statistical trends in populations, not individual outcomes. Many factors, including genetics and environment, contribute to the development of myopia.
Is rs6214 a diagnostic test for eye health?
No, rs6214 is not a diagnostic tool. Clinical eye health is determined by physical examinations performed by eye care professionals, not by individual genetic markers.
Why do different studies show different results for this variant?
Myopia is a complex trait influenced by many genes and environmental factors. Differences in study results often arise from variations in population ancestry, sample sizes, and the specific definitions of myopia used by researchers.
Should I change my lifestyle based on my rs6214 genotype?
No. You should not alter your lifestyle or medical care based on this genetic variant. Always consult with an eye care professional for advice tailored to your specific vision needs.
Sources & further reading
Educational information only, last refreshed 9/25/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Common promoter variant associated with circulating insulin-like growth factor 1 (IGF-1) concentrations, muscle mass development, and longevity phenotypes.
Polymorphism within the IGF1 locus associated with baseline muscle strength, circulating IGF-1 concentrations, and post-exercise muscle hypertrophy.
This regulatory variant in the IGF1 gene has shown inconsistent associations with high-grade myopia across different ethnic populations, requiring further validation.
A variant in the IGF1 gene that has been investigated for its role in ocular axial elongation and myopia susceptibility, though results remain population-dependent.
Polymorphism in the IGF1 gene region linked to risk of extreme myopia.
This SNP is identified as an instrumental variable in Mendelian randomization studies investigating the causal relationship between IGF-1 levels and vitamin D status.