Lecithin-Cholesterol Acyltransferase (LCAT) Deficiency
What is Lecithin-Cholesterol Acyltransferase (LCAT) Deficiency?
LCAT deficiency is a rare inherited disorder that affects how your body processes cholesterol. Your body relies on an enzyme called lecithin-cholesterol acyltransferase to convert free cholesterol into a different form that can be transported safely through your bloodstream. When this enzyme does not work properly, cholesterol builds up in abnormal ways throughout your body.
People with LCAT deficiency develop very low levels of HDL cholesterol, often called good cholesterol. This happens because the enzyme normally helps mature and stabilize HDL particles in your blood. Without working LCAT, these particles remain immature and unstable. The condition also causes cholesterol deposits in your eyes and kidneys over time.
There are two forms of this condition. Complete LCAT deficiency, also called familial LCAT deficiency, affects the enzyme's function entirely. Partial LCAT deficiency, known as fish-eye disease, affects only certain aspects of the enzyme's activity. Both forms are extremely rare, affecting fewer than 1 in 1 million people worldwide.
Symptoms
- Cloudy or hazy corneas causing vision problems
- Very low HDL cholesterol levels on blood tests
- Abnormal cholesterol deposits in the eyes
- Protein in the urine
- Kidney problems or kidney failure
- Anemia or reduced red blood cell count
- Enlarged spleen or liver
- Early onset heart disease in some cases
Many people with LCAT deficiency have no symptoms in childhood. Eye and kidney problems typically develop during the teenage years or early adulthood. Some people may not discover they have the condition until routine blood work shows unusual cholesterol patterns.
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Causes and risk factors
LCAT deficiency is caused by mutations in the LCAT gene. This gene provides instructions for making the enzyme that processes cholesterol in your bloodstream. You inherit this condition in an autosomal recessive pattern, meaning you must receive one mutated gene copy from each parent to develop the disorder. Parents who each carry one copy typically have no symptoms themselves.
There are no lifestyle or environmental risk factors for developing LCAT deficiency. The condition is purely genetic and present from birth. However, certain populations may have slightly higher carrier rates due to founder effects. The severity of symptoms can vary based on the specific genetic mutation and how much it affects enzyme function.
How it's diagnosed
Doctors diagnose LCAT deficiency through blood tests that reveal a characteristic pattern of cholesterol abnormalities. The most notable finding is extremely low HDL cholesterol, often below 10 mg/dL when normal levels are above 40 mg/dL. Blood tests also show reduced large HDL particles and abnormal total cholesterol levels. An eye exam may reveal corneal clouding, and urine tests often detect protein spillage indicating kidney involvement.
Rite Aid offers blood testing that measures HDL cholesterol, HDL large particles, and total cholesterol. These biomarkers can help identify the unusual cholesterol patterns seen in LCAT deficiency. If your results show very low HDL with other abnormal findings, your doctor may order genetic testing to confirm the diagnosis and identify the specific LCAT gene mutation.
Treatment options
- Regular monitoring of kidney function and cholesterol levels
- Low-fat diet to reduce cholesterol intake
- Treatment of anemia with medications or transfusions if needed
- Blood pressure control to protect kidney health
- Kidney transplant for advanced kidney failure
- Corneal transplant if vision becomes severely impaired
- Management of cardiovascular risk factors
- Avoidance of traditional cholesterol medications that may worsen lipid abnormalities
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Frequently asked questions
The earliest signs are often cloudy corneas and very low HDL cholesterol on blood tests. Many people have no symptoms in childhood. Eye cloudiness and kidney problems typically appear during the teenage years or early adulthood. Routine blood work may detect abnormal cholesterol patterns before any symptoms develop.
LCAT deficiency causes extremely low HDL cholesterol rather than high LDL cholesterol seen in common conditions. The disorder also causes unique physical findings like corneal clouding and kidney disease. Most cholesterol disorders respond to statin medications, but LCAT deficiency requires different management approaches. This condition is genetic and present from birth, not caused by diet or lifestyle.
Yes, blood tests can reveal the characteristic pattern of extremely low HDL cholesterol and abnormal lipid levels. Testing for HDL cholesterol, HDL large particles, and total cholesterol helps identify this rare condition. If these tests show unusual results, your doctor will likely order genetic testing to confirm the diagnosis. Rite Aid offers blood tests for these key cholesterol markers.
Yes, LCAT deficiency is an inherited genetic condition passed down in families. You must inherit one mutated LCAT gene from each parent to develop the disorder. Parents who carry one copy are called carriers and typically have no symptoms. Genetic counseling can help families understand inheritance patterns and testing options for family members.
Abnormal cholesterol deposits build up in the kidneys over time, damaging their filtering ability. This causes protein to leak into the urine and can progress to kidney failure. Kidney problems usually develop during adolescence or early adulthood. Some people eventually need dialysis or kidney transplantation to manage advanced kidney disease.
A low-fat diet may help reduce the amount of cholesterol your body needs to process. However, dietary changes cannot cure or reverse the underlying genetic defect. Nutrition changes work best as part of a broader treatment plan that includes regular monitoring and medical management. Your doctor or dietitian can provide specific dietary recommendations based on your individual needs.
Abnormal cholesterol particles deposit in the cornea, the clear outer layer of the eye. These deposits create a cloudy or hazy appearance that can affect vision. The cloudiness tends to worsen over time as more cholesterol accumulates. In severe cases, a corneal transplant may be needed to restore clear vision.
The relationship between LCAT deficiency and heart disease is complex and not fully understood. Despite very low HDL cholesterol, some people do not develop early heart disease. Others may have increased cardiovascular risk due to abnormal cholesterol particles and other factors. Regular monitoring and management of all cardiovascular risk factors remains important for long-term health.
Most doctors recommend blood testing at least once or twice per year to monitor cholesterol levels and kidney function. More frequent testing may be needed if kidney disease progresses or new symptoms develop. Regular monitoring helps catch complications early and adjust treatment as needed. Rite Aid offers convenient blood testing at Quest Diagnostics locations nationwide.
Currently, there is no cure that fixes the underlying genetic defect causing LCAT deficiency. Treatment focuses on managing symptoms and preventing complications like kidney failure. Researchers are studying potential therapies including enzyme replacement and gene therapy. For now, regular monitoring and supportive care remain the foundation of treatment for this rare condition.