Which are the causes of Coats Disease?

The exact cause of Coats Disease remains unknown, but it is widely considered a sporadic, non-hereditary condition characterized by the abnormal development of retinal blood vessels.

Pathophysiology and Genetic Factors

While the precise trigger for Coats Disease is still being investigated, the condition is defined by the breakdown of the blood-retina barrier. In a healthy eye, blood vessels are tightly regulated; in Coats Disease, these vessels are structurally weak, leaky, and prone to dilation (telangiectasia). This leakage allows fluid and lipid deposits to accumulate beneath the retina, which can lead to vision loss. Importantly, unlike many other rare conditions, Coats Disease is almost never inherited. Genetic studies have identified somatic mutations—specifically in the NDP gene (which is also linked to Norrie disease)—in some patients. These are "accidental" mutations that occur in the eye tissue after conception, rather than being passed down from parents through the germline.

Risk Factors vs. Causes

It is vital to distinguish between a cause and a risk factor. A cause is the biological mechanism—such as a genetic mutation—that triggers the disease, whereas a risk factor is a correlation. Currently, there are no known environmental, dietary, or lifestyle triggers for Coats Disease. The condition is significantly more common in males than in females, and it typically presents in one eye (unilateral), though the exact reason for this gender and lateralization disparity remains a major focus of ongoing ophthalmic research.

Current Research

Medical researchers are currently exploring the role of vascular endothelial growth factor (VEGF) and other signaling pathways that govern vessel growth. By studying these pathways, we hope to better understand why the blood vessels in Coats Disease fail to mature properly. Ongoing clinical studies are focused on identifying the specific molecular "switches" that go wrong, which may eventually lead to more targeted, less invasive treatments for those living with Coats Disease.

Medical Disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always seek the advice of your ophthalmologist or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD)


• Orphanet: The portal for rare diseases and orphan drugs


• Online Mendelian Inheritance in Man (OMIM)


• The Jack McGovern Coats Disease Foundation