CDKN2B-AS1 rs215770: Genetic Marker and Glaucoma Risk
The rs215770 variant is a common single nucleotide polymorphism located in the CDKN2B-AS1 gene region on chromosome 9p21. Genomic studies have investigated this locus for its statistical associations with intraocular pressure dynamics and susceptibility to primary open-angle glaucoma (POAG). Because overall direct clinical evidence remains limited, it serves primarily as an educational research marker rather than a diagnostic tool.
What each genotype means
Baseline glaucoma risk
This genotype represents the common state at this locus. Research indicates that individuals with this genotype do not carry the specific risk-associated allele linked to primary open-angle glaucoma in this region. Please note that glaucoma risk is multifactorial, involving both genetic and environmental factors.
Carried by approximately 35-45% of individuals in many European and Asian populations, though frequencies vary by ancestry.
Increased glaucoma susceptibility
Carrying one copy of the risk-associated allele is statistically linked to a higher susceptibility to primary open-angle glaucoma and may influence intraocular pressure regulation. This association is based on population-level studies and does not guarantee the development of the condition. You should discuss your eye health and any family history of glaucoma with your ophthalmologist.
This heterozygous genotype is common, appearing in a significant portion of the population across European and Asian ancestries.
Elevated glaucoma risk
Individuals with this genotype carry two copies of the variant associated with an increased risk of primary open-angle glaucoma in genome-wide association studies. While this variant is linked to susceptibility and potential modulation of optic nerve degeneration, it is only one of many factors contributing to eye health. Regular comprehensive eye examinations are recommended for monitoring.
This genotype is observed in a substantial subset of the population, with frequencies reflecting the prevalence of the minor allele in European and Asian groups.
Genomic Location and the CDKN2B-AS1 Region
The variant rs215770 is located on chromosome 9 within the 9p21 locus, mapping to the long non-coding RNA gene CDKN2B-AS1 (also known as ANRIL). Rather than coding directly for a protein, CDKN2B-AS1 produces a regulatory RNA transcript that coordinates the epigenetic silencing and transcriptional activity of nearby tumor suppressor genes, specifically CDKN2A and CDKN2B. The chromosome 9p21 region contains complex clusters of regulatory elements and enhancers that modulate cell cycle progression, cellular senescence, and apoptosis. Genetic variants residing across this non-coding segment frequently alter enhancer binding sites or non-coding RNA stability. Because rs215770 sits in an intensely studied regulatory hub, scientists frequently examine whether variants here subtly influence the survival, structural integrity, and stress responses of sensitive tissues like retinal ganglion cells.
Biological Role in Glaucoma and Ocular Mechanics
Primary open-angle glaucoma is a multifactorial ocular condition characterized by progressive optic nerve head excavation, loss of retinal ganglion cells, and visual field deficits. Although intraocular pressure (IOP) is the primary modifiable physiological risk factor, the underlying biological mechanisms governing susceptibility involve complex cellular pathways. Non-coding variations in the CDKN2B-AS1 locus are hypothesized to alter the sensitivity of retinal ganglion cells and optic nerve head astrocytes to mechanical stress and elevated pressure. In ocular tissues, dysregulation of the CDKN2A and CDKN2B cell cycle pathway can predispose cells to accelerated senescence or premature apoptotic death under sustained mechanical strain. Polymorphisms in this locus may therefore influence either baseline pressure dynamics or the biological vulnerability of nerve fibers to standard physical forces inside the eye.
Research Evidence and Association Strengths
Genome-wide association studies (GWAS) and meta-analyses have established chromosome 9p21 as one of the most prominent genomic loci associated with primary open-angle glaucoma and related endophenotypes, such as the vertical cup-disc ratio. Research at the CDKN2B-AS1 locus often reveals distinct linkage blocks, where specific variants track closely with differences in disease risk across cohorts. However, the direct evidence connecting rs215770 itself remains categorized as limited and exploratory. While regional tagging SNPs like rs2157719 and rs4977756 demonstrate robust genome-wide significance, individual markers such as rs215770 often display modest effect sizes or ancestry-specific differences. Because association findings often reflect correlation across linked regions rather than confirmed cellular causation, scientists treat rs215770 as a contributory marker within a wider polygenic architecture rather than an independent causal driver.
Population Patterns and Ancestral Distribution
The rs215770 variant is widely distributed across global human populations. Public allele frequency databases, including dbSNP and gnomAD, indicate that the minor allele maintains a frequency between 35% and 45% in both European and Asian ancestries, reflecting a deeply conserved common variation. Because of its common status, millions of individuals carry one or two copies of each allele. However, the underlying linkage disequilibrium—the tendency of certain genetic variants to be inherited together—varies significantly between ancestral groups. Consequently, an allele that tracks with a specific trait in one population may show weaker or neutral associations in another group due to divergent genetic backgrounds and environmental exposures.
Interpreting Results and Clinical Perspective
Understanding your rs215770 genotype provides educational context regarding common human genetic variation, but it does not diagnose or predict eye disease. Primary open-angle glaucoma is governed by a multitude of interacting factors, including older age, family medical history, corneal thickness, lifestyle factors, and hundreds of minor genetic loci. Carrying an associated allele does not mean glaucoma will develop, nor does a standard baseline genotype guarantee protection against optic nerve damage. Comprehensive eye examinations—including tonometry to measure intraocular pressure and visual field assessments—remain the definitive medical approach for monitoring ocular health. Any questions regarding vision, pressure measurements, or family risk should be addressed directly with an optometrist or ophthalmologist.
How common is this variant?
The minor allele frequency for rs215770 ranges between approximately 0.35 and 0.45 across European and Asian populations, making all three genotypes common worldwide.
Frequently asked questions
Can testing rs215770 tell me if I have glaucoma?
No. The rs215770 variant is not a diagnostic marker and cannot confirm or rule out primary open-angle glaucoma. Glaucoma diagnosis requires clinical evaluations by an eye care specialist, including intraocular pressure checks, optic nerve imaging, and visual field tests.
What is the function of the CDKN2B-AS1 gene?
CDKN2B-AS1 produces a long non-coding RNA molecule that helps regulate the activity of nearby genes, such as CDKN2A and CDKN2B. These genes play critical roles in cell cycle control, cellular aging, and programmed cell death in various tissues.
Why is chromosome 9p21 important in eye research?
Genome-wide studies have consistently flagged the chromosome 9p21 locus as a major region influencing susceptibility to primary open-angle glaucoma and variations in the optic nerve's vertical cup-to-disc ratio. Variations in this region appear to affect how ocular cells respond to physiological and mechanical pressures.
Does my rs215770 genotype change my medical care?
No, your rs215770 genotype should not alter your personal medical care or screening schedule. Clinical decisions regarding eye pressure monitoring or preventive therapies are based on established clinical metrics, physical eye exams, and overall family history rather than single common genetic variants.
Sources & further reading
Educational information only, last refreshed 9/5/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs215770?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29Related variants in CDKN2B-AS1
This variant in the CDKN2B-AS1 long noncoding RNA gene is associated with extreme longevity in genome-wide association studies.
A non-coding variant in the CDKN2B-AS1 locus associated with human longevity and survival beyond 90 years of age.
Non-coding RNA locus SNP associated with endometriosis development through altered regulation of cell cycle progression and local tissue remodeling.
This variant is a well-established risk locus for coronary artery disease and related cardiovascular conditions.
Located in the non-coding CDKN2B-AS1 locus, this variant confers significant risk for normal-tension and primary open-angle glaucoma.
Chromosome 9p21 non-coding regulatory variant conferring increased predisposition to coronary artery disease, myocardial infarction, and intracranial aneurysm.