The RPE65 gene helps recycle vitamin A in the retina so your eyes can turn light into signals for the brain. If it does not work properly, people may have trouble seeing in dim light from childhood and vision can narrow or worsen over time, often in inherited retinal conditions such as Leber congenital amaurosis or retinitis pigmentosa. Some people first learn about this gene because RPE65 related inherited blindness became widely known through one of the first approved gene therapies.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate activities in the body. Some genes provide the code for proteins, which are the parts of cells that do much of the work. Others mainly direct when a process happens, where it happens, and how active it is. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, and medications. More detailed information on this topic is available in the LearnHub.
Overview
RPE65Gene function
What if the gene works
The RPE65 gene helps the retina recycle vitamin A so light-sensing cells can respond to light. This supports everyday vision, especially in dim light.
Risk
What if the gene does not work
Variants in the RPE65 gene can cause inherited retinal conditions with night blindness, poor vision from infancy or childhood, and gradual vision loss. Milder or more severe variants may influence when vision problems begin and how much sight is affected.
Treatment
What does that mean for your treatment
For people with pathogenic variants in both copies of the RPE65 gene, gene replacement therapy with voretigene neparvovec can be a treatment option. Eligibility also depends on having enough living retinal cells, because the treatment aims to support the remaining light sensing tissue.
Conditions associated with RPE65
Gene function
What if the gene works
In the back of the eye, a steady recycling loop helps you keep seeing from moment to moment. The RPE65 gene supports this process in support cells behind the retina. Its job is to help remake a form of vitamin A that rods and cones need for vision.
Inside support cells behind the retina, the RPE65 gene helps convert stored vitamin A material into 11-cis retinol (a vitamin A form used to make light-sensitive pigment). This step is central to the RPE65 gene’s role in the visual cycle.
This gene helps supply rods and cones with the ingredient they need to rebuild visual pigment after light exposure. By refreshing that pigment, it supports ongoing sight in both dim and bright settings.
The RPE65 gene works in support cells behind the retina that process and return recycled vision molecules to nearby light sensing cells. This close handoff helps the eye reuse materials efficiently throughout the day.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many have no noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the RPE65 gene can make the protein unstable, shaped incorrectly, or unable to carry out a key chemical step in retinal cells. Some RPE65 gene variants leave partial activity, while more severe variants can nearly switch the protein off. This helps explain how RPE65 gene variants can lead to earlier or more marked inherited retinal disease in some people, while others have a milder course.
How variants are linked to conditions
Pathogenic variants in the RPE65 gene are a well-established cause of inherited retinal disease, especially Leber congenital amaurosis and severe early childhood onset retinal dystrophy. In many people, changes in both copies of the RPE65 gene lead to vision loss that begins in infancy or childhood, often with poor night vision and narrowing side vision over time. Some RPE65 variants are also linked to certain forms of retinitis pigmentosa.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are common throughout the general population. Most do not have a direct effect on health and instead reflect natural human variation. For many genes, carrying a variant associated with a condition suggests a possible link rather than a confirmed diagnosis, especially when several genes and environmental factors also play a role. In some situations, though, a single well-characterized variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For RPE65-related eye conditions, risk is mainly set by genetics: people usually develop disease only if they inherit two altered copies of the RPE65 gene, one from each parent. There is not yet broadly confirmed evidence that lifestyle or environmental factors meaningfully change this inherited risk, though regular eye follow-up can help track changes early.
Inheritance of RPE65 variants
RPE65-related eye conditions are inherited in an autosomal recessive pattern, which means a child usually needs to inherit two disease-causing variants in the RPE65 gene, one from each parent. In many families learning how RPE65 gene variants are inherited, this means two carrier parents have a 25% chance with each pregnancy of having an affected child, a 50% chance of having a carrier child, and a 25% chance of having a child without either variant. Because the RPE65 gene is on an autosome, this pattern affects boys and girls equally.
What does my RPE65 result mean for my family?
For many families, an RPE65 result means close relatives could also carry the same gene change, even if their eyesight is normal. Most RPE65-related eye conditions happen when a child inherits one changed copy from each parent, so brothers, sisters, and future children may also be affected or be carriers. A smaller number of RPE65 changes are linked to a dominant pattern, so family implications can depend on the exact result and condition.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the RPE65 gene, doctors use RPE65 genetic testing for inherited retinal disease, usually from a blood sample or saliva. A laboratory reads the DNA sequence and compares it with the usual code to identify variants that may help confirm the cause of vision loss.
When should I consider getting a genetic test?
Genetic testing for the RPE65 gene may be worth considering if you or your child has an inherited eye condition that affects the light-sensing part of the eye, especially early vision loss, poor night vision, or a family history of similar problems. A confirmed RPE65 change can clarify the cause and may affect treatment options, including gene therapy for some people.
A genetic result is only one part of your health story
A genetic result can provide meaningful insight, but how much it reveals depends on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, shape how the body functions over time. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best understood along with other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, genetic results can help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Two people can take the same treatment, yet one may get the expected benefit while the other may notice less effect or more side effects, partly because their bodies absorb, break down, transport, or respond to the drug differently. This kind of variation is common and helps explain why medication response is not the same for everyone.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way people respond to medications. It looks at links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence how strongly a drug works and how the body handles it. This information can support treatment decisions that are both better informed and more individualized. More detailed information on this topic is available in the LearnHub.
Drugs influenced by the RPE65 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting everyday medication response, so general medicine concerns are best discussed with your doctor. RPE65 is different in that it is linked to a gene-targeted treatment for some inherited vision loss, so people living with an RPE65-related eye condition may want to speak with their eye specialist when discussing treatment options.
History
The RPE65 gene became historically important through research on inherited vision loss in the 1990s. Scientists linked variants in the RPE65 gene to a form of childhood retinal disease, helping explain why some children gradually lost sight from an early age. Building on this early work, scientists uncovered more about the gene and used animal studies to test whether vision could be improved. That work led to one of the first approved gene therapies for an inherited condition, a major milestone in modern medicine. The story of the RPE65 gene helped move gene therapy from a long hoped for idea into routine clinical care for some people with rare eye conditions.