The LRAT gene helps your body store vitamin A and use it in the retina, the light sensing tissue at the back of the eye. If this gene does not work properly, the eye may struggle to make the molecules needed for vision, especially in dim light. People with harmful variants in the LRAT gene can develop inherited retinal conditions such as Leber congenital amaurosis or retinitis pigmentosa. This can lead to early vision problems, night blindness, and narrowing side vision over time.
What is a gene?
A gene is a stretch of DNA that holds instructions your cells can use to make molecules or regulate processes in the body. Some genes carry the information needed to produce proteins, the parts of cells that do the work. Other genes mainly help decide when certain processes happen, where they happen, and how strongly they occur. Together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. To explore this subject in greater depth, you can read more in the LearnHub.
Overview
LRATGene function
What if the gene works
The LRAT gene helps your body store vitamin A and recycle it in the eye. Its protein supports the visual cycle, which helps the retina work in dim light.
Risk
What if the gene does not work
Variants in the LRAT gene can disrupt the eye’s vitamin A cycle and cause inherited retinal disease, often with night blindness and worsening vision. Milder or more severe variants can influence when symptoms begin and how much sight is affected.
Treatment
What does that mean for your treatment
No treatment or management approach based specifically on a pathogenic or loss of function variant in the LRAT gene is currently established in clinical guidelines. LRAT associated retinal disease is being studied in early clinical research, including oral synthetic retinoids and gene therapy.
Conditions associated with LRAT
Gene function
What if the gene works
Your eyes and liver need the LRAT gene to handle vitamin A in a controlled way. It helps turn vitamin A into a stored form your body can keep and reuse. In the retina, this supports the normal visual cycle, the recycling system that helps vision continue after light exposure.
The LRAT gene helps cells convert vitamin A into retinyl esters, a stored form that is easier for the body to keep on hand. This supports a steady reserve for later use.
In the back of the eye, this gene helps recycle vitamin A after light reaches the retina. That process supports renewal of the light sensing molecule your eyes use to see in everyday conditions.
By packaging vitamin A into a usable reserve, the LRAT gene helps tissues draw on it when needed. This is a key part of how the LRAT gene supports vitamin A processing in the eye and the body.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not cause any noticeable effects and simply represent natural genetic variation. In some situations, however, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
In practice, how variants in the LRAT gene affect protein function depends on the change: some make the LRAT protein unstable or shortened, while others leave partial activity. These variants reduce the cell's ability to form retinyl esters (a storage form of vitamin A), which can disrupt vitamin A handling in retinal cells. More disruptive variants often lead to earlier and more marked inherited retinal disease than milder variants.
How variants are linked to conditions
When a person inherits two pathogenic variants in the LRAT gene, this can cause rare inherited retinal conditions, including Leber congenital amaurosis and some forms of retinitis pigmentosa. These LRAT gene variants linked to early vision loss are a well-established cause of progressive retinal disease, often starting with poor night vision and narrowing side vision or reduced vision from childhood. In this setting, genetic results can help confirm an LRAT-related retinal dystrophy.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widely found in the general population. Most do not have a direct effect on health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors are involved. In some situations, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For LRAT, risk is mainly shaped by the gene changes you inherit, especially if both parents carry a harmful LRAT variant. There is not enough evidence to say that lifestyle or environmental factors meaningfully change the chance of developing an LRAT-related eye condition. Regular eye care can still help track changes early and support vision.
Inheritance of LRAT variants
LRAT-related eye conditions are inherited in an autosomal recessive pattern. This means a person usually inherits one LRAT variant from each parent, and both copies of the LRAT gene need to carry a disease-causing variant for the condition to develop. Parents who each carry one variant are often unaffected carriers, and with each pregnancy there is a 25% chance their child will inherit both variants, a 50% chance the child will be a carrier, and a 25% chance the child will inherit neither variant. This is the usual answer to how LRAT variants are inherited.
What does my LRAT result mean for my family?
LRAT-related eye conditions usually run in families in a recessive way, which means close relatives may also carry the changed gene even if they do not have vision problems. Brothers and sisters can sometimes be affected or be carriers, and other relatives may also want to learn whether the variant is present in the family. For children, the main family impact depends on whether the other biological parent also carries an LRAT variant.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for LRAT variants usually uses a blood or saliva sample to read the LRAT gene and look for changes linked to inherited retinal conditions. Results may identify a disease causing variant, find no relevant variant, or show a variant of uncertain significance, which means the change is not yet clearly understood.
When should I consider getting a genetic test?
Genetic testing for the LRAT gene may be worth considering if you or your child has unexplained inherited vision loss, especially severe vision problems starting in childhood, night blindness, or narrowing side vision. It can also be helpful when these eye conditions run in the family or when an eye exam suggests an inherited cause.
A genetic result is only one part of your health story
A genetic result can be informative, but how much it explains varies based on the condition and the kind of variant involved. Other factors, including lifestyle, environment, age, and medical history, also influence how the body functions over time. In some conditions, especially those affected by many genes, genetic information provides context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas like medication response, genetic results can also help put a person’s experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. A treatment that works well for one person may work less well for another, or may cause more side effects, because the body can absorb, break down, transport, or respond to a drug in different ways. These differences are common and can influence how strongly a medicine works or how sensitive someone is to it.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect the way they respond to medicines. It looks at connections between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medications, genes can influence either how strongly a drug works or how the body handles it. This information can help support treatment decisions that are more informed and more individualized. To explore this subject in greater detail, you can learn more in the LearnHub.
Drugs influenced by the LRAT gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in routine medication response, so medication concerns or new health changes are best discussed with your doctor. In specialized eye care, LRAT has been studied in people with inherited vision loss to see how they respond to retinoid-based treatments, but this is not part of standard prescribing guidance.