OTX2 rs104894465: Understanding This Rare Genetic Variant
The rs104894465 variant is a rare genetic change located within the OTX2 gene. It has been identified in clinical research as a potential factor in the development of ocular conditions such as microphthalmia and anophthalmia.
What each genotype means
Typical ocular development profile
This is the most common genotype observed in the general population. It is associated with the standard, functional version of the OTX2 protein, which plays a critical role in the normal development of the eyes and brain during embryonic stages.
This genotype is found in the vast majority of individuals across all global populations.
Rare OTX2 variant carrier
This genotype indicates you carry one copy of the rare OTX2 variant. Research suggests that heterozygous variants in OTX2 can be associated with variable ocular developmental issues, such as microphthalmia or anophthalmia, though the condition's expression is often complex and may show reduced penetrance. Because this variant is ultra-rare and evidence is limited, clinical expression varies significantly; please consult with a medical geneticist to discuss these findings in the context of your personal and family health history.
Carried by fewer than 1 in 100,000 individuals.
Likely significant developmental impact
This genotype indicates you carry two copies of the rare OTX2 variant. Because OTX2 is essential for early head and eye development, homozygous variants are typically associated with severe developmental malformations. Given the rarity of this genotype and the clinical implications of OTX2 dysfunction, it is strongly recommended that you discuss these results with a clinical geneticist or qualified healthcare provider for a formal assessment.
This genotype is extremely rare and has not been observed at significant frequencies in major population databases.
What is rs104894465?
The identifier rs104894465 refers to a specific single nucleotide polymorphism (SNP) located on chromosome 14. In the context of human genetics, this variant represents a change in the DNA sequence within the OTX2 gene. Scientists track these specific locations to understand how variations in our genetic code might influence biological processes or contribute to health conditions. Because this variant is extremely rare, it is not typically found in the general population, and its presence is usually investigated only in the context of specific clinical studies involving individuals with congenital eye abnormalities. It is important to note that identifying a variant does not automatically imply a health outcome, as many genetic changes are benign or have no observable effect on physical traits.
The Role of the OTX2 Gene
The OTX2 gene provides the blueprint for creating a protein known as a transcription factor. Transcription factors are essential biological tools that bind to specific regions of DNA to regulate the activity of other genes. OTX2 is particularly active during early embryonic development, where it acts as a master regulator for the formation of various body structures. It plays a critical role in the development of the eyes and the brain, including the pituitary gland, which is responsible for producing hormones that control growth and reproduction. Because OTX2 is so influential during the earliest stages of life, changes in this gene can potentially disrupt the complex signaling pathways required for normal eye and brain formation, which is why it is a focus of developmental biology research.
Research and Clinical Associations
Research has associated certain variants in the OTX2 gene with ocular malformations, including microphthalmia (abnormally small eyes) and anophthalmia (the absence of one or both eyes). These conditions can occur in isolation or as part of a broader syndrome that may involve intellectual disabilities or pituitary gland abnormalities. The evidence linking specific variants like rs104894465 to these conditions is considered limited, as these phenotypes often show complex inheritance patterns and can vary significantly even among family members with the same genetic change. Clinical databases, such as ClinVar, have categorized this variant as pathogenic in the context of syndromic microphthalmia. However, because the condition is rare and the genetic landscape is complex, researchers emphasize that the presence of a variant does not always lead to a consistent or predictable clinical outcome.
Population Frequency
The rs104894465 variant is classified as ultra-rare. According to data from the Genome Aggregation Database (gnomAD), its allele frequency is less than 0.00001, meaning it is virtually absent in the large, diverse cohorts of the general population studied to date. This extreme rarity is common for variants associated with severe, early-onset developmental conditions, as such variants are typically not passed down through generations at high frequencies. Because the variant is so uncommon, it is not a standard marker included in routine genetic screening or ancestry testing. Its identification is almost exclusively limited to specialized clinical diagnostic settings where a patient presents with specific, unexplained developmental symptoms.
What This Information Means for You
If you or a family member have been identified as carrying this variant, it is essential to understand that genetic information is complex and often requires professional interpretation. This variant is associated with developmental conditions, but the presence of a genetic marker is not a medical diagnosis. Genetic expression can be influenced by many factors, including other genes and environmental influences. You should never use genetic data to make medical decisions or attempt to diagnose a condition on your own. If you have concerns about your health or the health of a family member, the most appropriate step is to consult with a qualified genetic counselor or a medical specialist, such as an ophthalmologist or a clinical geneticist, who can provide context based on your specific clinical history.
How common is this variant?
The rs104894465 variant is ultra-rare, with a gnomAD allele frequency of less than 0.00001 across all major ancestral populations.
Frequently asked questions
Is rs104894465 a common genetic variant?
No, rs104894465 is an ultra-rare variant. It is not found in the vast majority of the human population and is typically only identified in specialized clinical research settings.
What conditions is the OTX2 gene associated with?
The OTX2 gene is involved in early eye and brain development. Variants in this gene have been associated with conditions like microphthalmia and anophthalmia, which involve the abnormal development or absence of the eyes.
Does having this variant mean I will have an eye condition?
Not necessarily. Genetic variants are only one piece of a complex puzzle. The presence of a variant does not guarantee a specific health outcome, and you should consult a medical professional for any clinical concerns.
Where can I get more information about OTX2 variants?
You can find reliable information through resources like MedlinePlus Genetics or the National Center for Biotechnology Information (NCBI). Always discuss specific genetic findings with a healthcare provider or genetic counselor.
Sources & further reading
Educational information only, last refreshed 9/22/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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A pathogenic point mutation causing transcription-factor loss of function resulting in severe microphthalmia, anophthalmia, and coloboma.
This pathogenic missense mutation disrupts homeodomain binding, causing syndromic microphthalmia and optic nerve hypoplasia.