IGF1 rs2946834: What Your Genotype Means
The rs2946834 variant is a single nucleotide polymorphism located within the IGF1 gene, which encodes a protein essential for growth and development. Researchers have investigated this variant for potential associations with myopia, or nearsightedness, due to the role of IGF-1 in regulating ocular axial elongation.
What each genotype means
Typical myopia risk
You carry two copies of the T allele at this IGF1-linked position. In published candidate-gene research, this genotype represents the common baseline profile and is not associated with an increased susceptibility to axial elongation or high-grade myopia. Because refractive development involves complex interactions among many genes and visual environments, routine eye examinations remain the standard way to monitor your vision.
Carried by approximately 40% to 45% of individuals of European descent and common across multiple worldwide populations.
Modestly altered myopia risk
You carry one copy of the C minor allele and one copy of the T allele near the IGF1 gene. Some family-based genetic studies have detected modest statistical associations between this marker region and myopia susceptibility, while other replication cohorts have found no significant effect. Having this genotype does not determine whether you will develop myopia, as eye growth is heavily influenced by outdoor activity, near-work habits, and many other genetic factors.
Carried by roughly 45% of individuals of European ancestry and frequent across diverse global ancestries.
Altered myopia susceptibility profile
You carry two copies of the C minor allele at this locus downstream of the IGF1 gene. Candidate-gene studies have evaluated this variant alongside IGF1 haplotypes in connection with ocular axial length and high myopia, but findings across European and East Asian cohorts remain mixed and inconclusive. This genotype carries only small statistical correlations and is neither diagnostic of high myopia nor predictive of vision loss.
Carried by approximately 10% to 15% of people of European descent.
Understanding the rs2946834 Variant
The rs2946834 variant is a specific change in the DNA sequence of the IGF1 gene. In genetics, a single nucleotide polymorphism (SNP) represents a variation at a single position in the DNA chain. This particular SNP has been the subject of scientific inquiry because of its location within a gene known to influence biological growth processes. When researchers study such variants, they look for statistical correlations between the presence of specific alleles and certain physical traits or conditions. Because rs2946834 is located in a region that may influence gene expression, it has been prioritized in studies examining the genetic architecture of eye development and refractive errors.
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, division, and survival throughout the body. In the context of ophthalmology, IGF-1 has been studied for its influence on the sclera, the tough outer layer of the eye. Experimental models, particularly in birds, have demonstrated that IGF-1 can stimulate ocular axial elongation, which is the process where the eye grows longer. Because excessive axial length is a primary driver of myopia, or nearsightedness, scientists have hypothesized that variations in the IGF1 gene might contribute to individual differences in how the eye grows and develops during childhood and adolescence.
Evidence and Research Findings
The evidence linking rs2946834 to myopia is considered moderate and remains inconsistent across different human populations. Early studies in international cohorts of Caucasian families suggested a potential association between this variant and high-grade myopia. However, subsequent replication studies, such as those conducted in Polish families, failed to find a significant link, highlighting the complexity of genetic associations. Similarly, research in Chinese and Japanese populations has yielded mixed results, with some studies identifying associations with specific haplotypes rather than the single SNP alone. These conflicting findings suggest that the influence of rs2946834 on myopia is likely dependent on ethnic background, environmental factors, or interactions with other genes, meaning it cannot be considered a definitive predictor of eye health.
Population Frequency
The frequency of the alleles for rs2946834 varies across different global populations. According to data from gnomAD, the minor allele frequency is approximately 0.35 in European populations. Because this variant is relatively common, it is frequently included in genetic association studies. However, the prevalence of a variant does not necessarily correlate with its clinical impact; rather, it indicates that the variation is a standard part of human genetic diversity. Researchers must account for these frequency differences when comparing results across diverse ancestral groups to ensure that findings are not skewed by population-specific genetic structures.
Interpreting Genetic Information
It is important to understand that genetic variants like rs2946834 are only one piece of a much larger puzzle regarding eye health. Myopia is a complex trait influenced by a combination of genetic, environmental, and lifestyle factors, such as time spent on near-work activities or outdoor exposure. Having a specific genotype at this location does not mean an individual will develop myopia, nor does it guarantee protection against it. This information is intended for educational purposes and should not be used for medical diagnosis or to predict personal health outcomes. If you have concerns about your vision or the development of myopia, please consult an optometrist or ophthalmologist for a comprehensive eye examination and professional clinical advice.
How common is this variant?
The minor allele frequency for rs2946834 is approximately 0.35 in European populations, indicating that the variant is common across diverse ancestries.
Frequently asked questions
Does having the rs2946834 variant mean I will get myopia?
No. Genetic variants are associated with statistical risks in large populations, but they do not determine individual health outcomes. Myopia is influenced by many factors, including environment and lifestyle.
Is rs2946834 a diagnostic test for nearsightedness?
No. There is no clinical genetic test for myopia based on this variant. Diagnosis of myopia is performed by eye care professionals through physical examinations and vision testing.
Why do some studies show an association and others do not?
This is common in complex trait genetics. Differences in study design, sample sizes, and the ancestral backgrounds of the participants can lead to varying results, which is why replication is essential.
Can I change my risk associated with this gene?
Genetic variants are inherited and cannot be changed. However, you can manage your eye health by following professional guidance, such as getting regular eye exams and practicing healthy visual habits.
Sources & further reading
Educational information only, last refreshed 10/18/2026. 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.
Polymorphism in the IGF1 gene region linked to risk of extreme myopia.
Variant in IGF1 associated with high-grade axial myopia and ocular axial elongation.
This SNP is identified as an instrumental variable in Mendelian randomization studies investigating the causal relationship between IGF-1 levels and vitamin D status.