PRSS56 rs7538876: What Your Genotype Means
The rs7538876 variant is a genetic marker located within the PRSS56 gene, which plays a critical role in regulating the axial growth of the human eye. Research suggests this variant may influence refractive development, potentially predisposing individuals to conditions such as extreme hyperopia and angle-closure glaucoma.
What each genotype means
Typical PRSS56 genotype
This genotype represents the most common configuration for this variant in many populations. Research indicates that PRSS56 is involved in eye development, and while this specific variant is studied for its potential influence on axial eye growth, carrying the common allele is generally considered the baseline state. It is not associated with the rare, recessive loss-of-function mutations that cause severe ocular conditions like posterior microphthalmos.
This is the most frequent genotype observed in populations of European ancestry.
Heterozygous carrier status
Carrying one copy of the minor allele is common and generally does not result in clinical symptoms. Because conditions associated with PRSS56 dysfunction are typically inherited in an autosomal recessive manner, individuals with one copy of this variant are usually unaffected. You should not expect this genotype to cause significant changes to your eye health or vision.
Carried by approximately 1 in 5 to 1 in 6 people of European ancestry.
Minor allele homozygous
This genotype represents the homozygous state for the minor allele. While some research suggests this variant may be associated with subtle variations in axial eye growth or susceptibility to certain eye conditions, the evidence remains limited and is not considered diagnostic. If you have concerns regarding your eye health or family history of glaucoma, please consult with an ophthalmologist for a comprehensive examination.
This genotype is the least common of the three, occurring in a small percentage of the European population.
Understanding the rs7538876 Variant
The rs7538876 variant is a single nucleotide polymorphism (SNP) situated within the PRSS56 gene. In genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. This specific variant is categorized as a trait-associated marker, meaning it has been statistically linked to certain physical characteristics or health outcomes in population studies. While the exact biological mechanism by which this specific SNP influences eye health is still being investigated, its location within a gene known to be vital for ocular development makes it a subject of interest for researchers studying refractive errors. It is important to note that the presence of this variant does not guarantee the development of any specific condition, as eye health is influenced by a complex interplay of multiple genetic factors and environmental influences.
The Role of the PRSS56 Gene
The PRSS56 gene encodes a protein known as serine protease 56. While the precise function of this protein is not fully understood, scientific evidence indicates that it is essential for proper eye development, particularly in determining the axial length of the eye. The axial length is the distance from the front to the back of the eyeball, a key factor in how light focuses on the retina. Mutations that cause a loss of function in PRSS56 have been strongly linked to nanophthalmos, a condition characterized by a significantly smaller eye size and extreme hyperopia, or farsightedness. Because PRSS56 is involved in regulating ocular growth, variations in this gene are hypothesized to contribute to the spectrum of refractive errors, ranging from hyperopia to myopia, by altering the signaling pathways that control how the eye grows during development.
Research and Evidence Strength
The evidence linking rs7538876 to specific ocular traits is currently considered limited. While rare, severe mutations in PRSS56 are well-documented causes of posterior microphthalmos and angle-closure glaucoma, the association between common variants like rs7538876 and these conditions is more nuanced. Genome-wide association studies (GWAS) have identified links between PRSS56 variants and refractive errors, suggesting that common genetic variations may play a role in the manifestation of more complex, common forms of vision issues. However, these associations are often statistical in nature and do not imply a direct causal relationship for every carrier. Because eye development is highly polygenic—meaning it is influenced by many genes working together—the impact of a single SNP like rs7538876 is likely modest. Further research is required to fully elucidate how this variant interacts with other genetic and environmental factors to influence long-term eye health.
Population Frequency and Interpretation
The rs7538876 variant is observed across various populations, with a minor allele frequency of approximately 0.11 in European cohorts. This frequency indicates that the variant is relatively common, appearing in a significant portion of the population. When interpreting genetic data, it is crucial to understand that population frequencies provide context for how common a variant is, but they do not predict individual health outcomes. Because the evidence for this variant is limited and potentially ancestry-specific, individuals should avoid drawing definitive conclusions about their personal risk for glaucoma or refractive errors based solely on this SNP. Genetic information is best viewed as one piece of a larger puzzle that includes clinical eye exams, family history, and lifestyle factors. Always consult with an eye care professional or a genetic counselor to discuss how your genetic profile relates to your specific clinical history.
How common is this variant?
The minor allele frequency for rs7538876 is approximately 0.11 in European populations, making it a relatively common genetic variant.
Frequently asked questions
Does having the rs7538876 variant mean I will get glaucoma?
No. Having this variant does not mean you will develop glaucoma. It is a statistical association found in research, and many people with this variant have healthy eyes.
Can I use this information to diagnose my eye condition?
No. Genetic variants are not diagnostic tools. Only a qualified eye care professional can perform the necessary clinical exams to diagnose eye conditions.
Is PRSS56 related to myopia or hyperopia?
Yes, research suggests that PRSS56 plays a role in ocular axial growth, and variants in this gene have been associated with both hyperopia and myopia in various studies.
Should I be worried if I have the GG genotype?
There is no reason for alarm. Genetic variants are common, and the association between this SNP and eye health is considered limited. Focus on regular comprehensive eye exams.
Sources & further reading
Educational information only, last refreshed 9/16/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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