ABCA1 rs2472493: What Your Genotype Means
The rs2472493 variant is a single nucleotide polymorphism located in the regulatory region upstream of the ABCA1 gene. It has been statistically associated in some genome-wide association studies with variations in intraocular pressure and optic disc parameters, though the clinical significance remains limited.
What each genotype means
Baseline risk profile
This genotype represents the baseline state for this variant. Research indicates that individuals without the G allele do not carry the specific genetic association with increased susceptibility to primary open-angle glaucoma linked to this site.
This genotype is common, though its exact prevalence varies significantly by ancestral background.
Elevated glaucoma risk
Carrying one copy of the G allele is associated with a statistically higher risk of developing primary open-angle glaucoma compared to those without it. This variant is thought to influence ocular lipid homeostasis, which may affect intraocular pressure.
This heterozygous genotype is found in a significant portion of the population, with the minor allele frequency reported between 20% and 30% in many groups.
Increased glaucoma risk
Carrying two copies of the G allele is associated with a higher odds ratio for primary open-angle glaucoma compared to the baseline. While this association is statistically significant in large studies, it is one of many factors that contribute to eye health and does not guarantee the development of any condition.
This homozygous genotype is less common than the heterozygous form, appearing in a smaller subset of the population depending on ancestral background.
What is rs2472493 and Where Does It Sit?
The term SNP stands for single nucleotide polymorphism, which is a variation at a single position in the DNA sequence. The rs2472493 variant is located on chromosome 9 within the regulatory landscape upstream of the ABCA1 (ATP-binding cassette transporter A1) gene. Because it sits in a non-coding region, it does not change the amino acid sequence of the protein itself. Instead, researchers hypothesize that variants in this region may influence how much ABCA1 protein is produced or when and where it is expressed in the body. By studying these genomic switches, scientists aim to understand how subtle differences in DNA regulation can contribute to complex traits. While rs2472493 is cataloged in the GWAS Catalog for its association with ocular measurements, it is important to remember that most variants in non-coding regions have subtle effects, and their influence is often shaped by a combination of other genetic and environmental factors.
The Role of the ABCA1 Gene
The ABCA1 gene provides instructions for making a protein that plays a critical role in managing cholesterol and lipids within the body. This protein acts as a transporter, helping to move cholesterol and phospholipids out of cells, which is a fundamental step in the formation of high-density lipoprotein (HDL), often referred to as good cholesterol. While ABCA1 is well-known for its systemic role in cardiovascular health, its function extends to various tissues, including the eye. In ocular biology, maintaining lipid homeostasis is essential for the health of the retina and the optic nerve. By regulating the movement of lipids, ABCA1 helps maintain the structural and functional integrity of ocular cells. Disruptions or variations in how ABCA1 is regulated may theoretically alter the environment within the eye, leading researchers to investigate whether this gene contributes to differences in intraocular pressure or optic nerve morphology.
Understanding the Research Associations
Research into rs2472493 is primarily driven by genome-wide association studies (GWAS), which scan the entire genome to find statistical correlations between specific DNA variants and physical traits. Several studies have explored the link between rs2472493 and ocular phenotypes, such as intraocular pressure—the fluid pressure inside the eye—and the cup-to-disc ratio, which is a measure used to assess the optic nerve. The evidence for these associations is currently considered limited. While statistical signals have been detected in large cohorts, the effect sizes are generally small, and findings have not always been consistent across different study populations. This means that having a specific genotype at this position does not guarantee any particular ocular outcome. The complexity of eye health involves an interplay of genetics, lifestyle, and age, making it difficult to isolate the contribution of a single SNP like rs2472493 from the broader genetic background.
What This Information Means for You
It is important to understand that information about rs2472493 is for educational purposes and cannot be used to diagnose or predict any medical condition. The associations described in research are statistical trends observed in large groups of people, which may not apply to any single individual. Because the evidence linking this variant to ocular health is limited and mixed, it does not serve as a clinical tool for risk assessment. Genetic variation is only one small piece of a much larger puzzle regarding your health. If you are concerned about your vision, intraocular pressure, or eye health, the most effective course of action is to schedule a comprehensive eye exam with an optometrist or ophthalmologist. A healthcare professional can perform direct measurements and provide guidance based on your personal health history, which is far more accurate than any single genetic marker.
How common is this variant?
The rs2472493 variant is a relatively common genetic marker, with a minor allele frequency typically ranging between 20% and 30% across major ancestral populations.
Frequently asked questions
Is rs2472493 a predictor of glaucoma?
No, rs2472493 is not a diagnostic tool or a predictive test for glaucoma. While some research has investigated its association with intraocular pressure, it does not provide clinical evidence for diagnosing or predicting the risk of developing glaucoma.
Should I change my lifestyle based on this genotype?
Genetic information for this variant should not be used to make changes to your lifestyle or health routines. General eye health recommendations, such as eating a balanced diet and attending regular eye exams, are standard for everyone regardless of their genotype.
Can I use this result to determine my eye pressure?
No, a genotype for rs2472493 cannot determine your intraocular pressure. Intraocular pressure can only be accurately assessed by an eye care professional using clinical instruments like a tonometer.
Why do different studies show different results for this SNP?
Genetic association studies can vary due to differences in sample size, the ancestral backgrounds of the participants, and the methods used to measure ocular traits. When evidence is described as limited, it often reflects these inconsistencies in the scientific literature.
Sources & further reading
Educational information only, last refreshed 9/28/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant in the ABCA1 locus is associated with the regulation of cholesterol efflux and the formation of nascent high-density lipoprotein (HDL) particles.
Identified as a regulatory SNP influencing metabolic traits in Indigenous American populations.
This intergenic variant in the ABCA1 locus influences high-density lipoprotein cholesterol transport in the retina and predisposes to primary open-angle glaucoma.