What If Your Retinitis Pigmentosa Genetic Test is Negative?

If your eye doctor has diagnosed you with retinitis pigmentosa based on the appearance of your retina and your symptoms, a negative genetic test does not mean you were misdiagnosed. A clinical diagnosis is based on what the doctor sees during an exam, while a genetic test looks for the specific “typo” in your DNA that caused it. Because current genetic testing identifies the exact genetic cause in only about 50% to 75% of patients ^[1][2], it is entirely possible to have all the classic signs of RP but not receive a positive genetic match today. Importantly, a negative genetic test does not change your overall clinical care—your doctor will still monitor your vision and manage your symptoms exactly the same way.

Why Did the Test Come Back Negative?

There are several reasons why your genetic test may not have found the exact cause of your condition:

• Undiscovered genes: Retinitis pigmentosa is incredibly complex. There are over 70 known genes that cause the non-syndromic forms of the condition ^[3], and scientists continue to discover new ones ^[4][5]. The gene responsible for your vision loss may simply not have been discovered or added to the testing panels yet.
• Complex mutations: Standard genetic tests are excellent at finding simple spelling errors in your DNA. However, they can miss more complex structural changes, such as missing chunks of DNA, called copy number variations, or errors in how the DNA is read, known as splice defects ^[6][7].
• Atypical conditions: In some cases, a negative result might prompt your doctor to reconsider whether your symptoms are caused by a different genetic condition that mimics RP, or a systemic syndrome—such as Usher syndrome, where mild hearing loss might develop alongside vision changes ^[8].

Understanding “Variants of Uncertain Significance” (VUS)

Sometimes, a genetic test doesn’t come back clearly positive or negative. Instead, it flags a Variant of Uncertain Significance (VUS). A VUS means the laboratory found a change in your DNA, but there is not yet enough scientific evidence to know if this specific change causes the disease or is just a harmless natural variation ^[9].

Working with a genetic counselor (a medical professional specializing in genetics) before and after testing is highly recommended. If you have a VUS, they might suggest testing other family members ^[10]. Checking to see if the same DNA change appears in relatives who also have RP can help researchers determine if the VUS is truly responsible for your condition ^[11][10].

Actionable Next Steps: Joining a Patient Registry

Falling into the “unsolved” genetic bucket can feel frustrating, but you are not out of options. One of the most important steps you can take is to join an inherited retinal disease (IRD) registry, such as the VENTURE registry or My Retina Tracker ^[12][13].

Registries are secure databases where patients share their clinical and genetic information with researchers ^[14]. Joining a registry is vital for a few reasons:

• Re-testing alerts: As genetic knowledge expands and testing technology improves, registries can notify you when new testing panels become available that might identify your specific mutation ^[15]. In addition to relying on registry alerts, it is a good idea to proactively check in with your genetic counselor or ophthalmologist every 1 to 3 years. Often, future testing simply requires a re-analysis of the DNA data already on file, rather than a new blood or saliva draw.
• Research participation: By contributing your anonymized data, you help scientists discover the missing RP genes, moving the science forward for everyone ^[16].
• Clinical trial matching: If a new treatment or gene therapy is developed for your clinical profile, registries provide a direct pathway for researchers to find and recruit eligible patients ^[13].