Familial Defective Apolipoprotein B-100
What is Familial Defective Apolipoprotein B-100?
Familial Defective Apolipoprotein B-100 is a genetic condition that affects how your body processes cholesterol. People with this condition have a mutation in the gene that makes apolipoprotein B, or Apo B. This protein normally helps carry LDL cholesterol, often called bad cholesterol, from your blood into your cells.
When the Apo B protein is defective, it cannot bind properly to LDL receptors on your cells. Your cells cannot absorb LDL cholesterol effectively. This causes LDL cholesterol and Apo B levels to build up in your bloodstream. Over time, elevated LDL cholesterol increases your risk of heart disease and stroke.
This condition is inherited from one parent and present from birth. It affects roughly 1 in 500 to 1 in 1,000 people. Many people do not know they have it until blood testing reveals high cholesterol levels. Early detection through Apo B testing helps you manage cholesterol and reduce cardiovascular risk.
Symptoms
- High LDL cholesterol levels on blood tests
- Cholesterol deposits around tendons, especially Achilles tendon
- Yellowish cholesterol deposits around eyelids, called xanthelasma
- Chest pain or angina if heart disease develops
- Early heart attacks, sometimes before age 50
- Family history of high cholesterol or early heart disease
Many people with this condition have no obvious symptoms early on. High cholesterol often develops silently over years. Regular blood testing is the most reliable way to detect elevated Apo B and LDL cholesterol levels before complications occur.
Concerned about Familial Defective Apolipoprotein B-100? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
Familial Defective Apolipoprotein B-100 is caused by mutations in the APOB gene. This gene provides instructions for making apolipoprotein B, a protein that helps transport cholesterol through your bloodstream. The most common mutation is called R3500Q. When this mutation is present, the Apo B protein cannot bind properly to LDL receptors. Your cells cannot remove LDL cholesterol from your blood efficiently. The condition is inherited in an autosomal dominant pattern, meaning you only need one copy of the mutated gene from one parent to develop it.
Risk factors include having a parent with this genetic mutation or a family history of high cholesterol and early heart disease. Unlike common high cholesterol, this condition is not primarily caused by diet or lifestyle. However, diet, smoking, lack of exercise, and obesity can worsen cholesterol levels and increase cardiovascular risk in people who already have the genetic mutation.
How it's diagnosed
Familial Defective Apolipoprotein B-100 is diagnosed through blood testing and family history evaluation. A lipid panel showing elevated LDL cholesterol levels is often the first sign. Measuring Apolipoprotein B is particularly helpful because it is elevated in this condition. High Apo B levels combined with high LDL cholesterol and a family history of early heart disease suggest a genetic cause. Genetic testing can confirm the specific APOB gene mutation, though it is not always necessary for diagnosis.
Rite Aid offers Apolipoprotein B testing as an add-on to our flagship blood panel. This test measures Apo B levels to help identify and monitor this condition. Testing at one of our 2,000 Quest Diagnostics locations makes it easy to track your cholesterol markers regularly. Early detection helps you and your doctor create a treatment plan to reduce cardiovascular risk.
Treatment options
- Statins to lower LDL cholesterol production in the liver
- Ezetimibe to reduce cholesterol absorption from food
- PCSK9 inhibitors for severe cases not controlled by other medications
- Heart-healthy diet low in saturated fat and trans fat
- Regular exercise, aiming for 150 minutes per week
- Maintaining a healthy weight to reduce cardiovascular strain
- Avoiding smoking and limiting alcohol intake
- Regular monitoring of Apo B and LDL cholesterol levels
- Working with a cardiologist or lipid specialist for ongoing care
Need testing for Familial Defective Apolipoprotein B-100? Add it to your panel.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Familial Defective Apolipoprotein B-100 is a genetic disorder caused by mutations in the APOB gene. This mutation affects how apolipoprotein B works in your body. The defective protein cannot bind properly to LDL receptors, causing LDL cholesterol and Apo B to build up in your blood. This increases your risk of heart disease and stroke.
Both conditions cause high LDL cholesterol from birth, but they involve different genetic mutations. Familial hypercholesterolemia affects the LDL receptor itself, while Familial Defective Apo B-100 affects the protein that binds to the receptor. Measuring Apo B levels helps doctors tell these conditions apart. Both require similar treatment approaches focused on lowering cholesterol.
Most people have no obvious symptoms until cholesterol levels are checked. Some develop cholesterol deposits around tendons or eyelids. Without treatment, elevated cholesterol can lead to chest pain, heart attacks, or stroke, often at younger ages than typical. Regular blood testing is the best way to detect this condition before serious complications develop.
Diagnosis involves blood tests measuring LDL cholesterol and Apolipoprotein B levels. High levels of both markers, combined with a family history of high cholesterol or early heart disease, suggest this condition. Genetic testing can confirm the APOB gene mutation. Rite Aid offers Apo B testing to help identify and monitor this condition.
The Apolipoprotein B test, or Apo B test, measures the amount of Apo B protein in your blood. This protein is found on LDL cholesterol particles and helps transport cholesterol through your bloodstream. Elevated Apo B levels indicate high numbers of LDL particles, which is a strong marker of cardiovascular risk. This test is available as an add-on through Rite Aid.
Yes, this condition is inherited in an autosomal dominant pattern. You only need one copy of the mutated APOB gene from one parent to develop it. If you have this condition, each of your children has a 50% chance of inheriting the mutation. Family screening is recommended if one person is diagnosed.
Treatment focuses on lowering LDL cholesterol and Apo B levels to reduce heart disease risk. Statins are usually the first medication prescribed. Some people also need ezetimibe or PCSK9 inhibitors for additional cholesterol lowering. Lifestyle changes like heart-healthy eating, regular exercise, and not smoking are also important.
Diet and exercise cannot reverse the genetic mutation, but they help manage cholesterol levels. A diet low in saturated fat and trans fat reduces LDL cholesterol. Regular physical activity improves overall cardiovascular health. However, most people with this condition also need medication to bring cholesterol down to safe levels.
Your doctor will likely recommend testing Apo B and LDL cholesterol levels every 3 to 6 months when starting treatment. Once your levels are stable, testing every 6 to 12 months is common. Regular monitoring helps ensure your treatment plan is working. Rite Aid makes it easy to track your levels over time with convenient testing at Quest Diagnostics locations.
Untreated high cholesterol significantly increases your risk of atherosclerosis, where plaque builds up in your arteries. This can lead to heart attacks, strokes, and peripheral artery disease, often at younger ages. Early diagnosis and treatment can lower cholesterol levels and reduce these risks. Regular monitoring and working with your doctor are essential for long-term heart health.