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Chapter 29: Problem 14

What is familial hypercholesterolemia, and what are its causes?

Short Answer

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Familial hypercholesterolemia is a genetic condition caused by mutations affecting LDL cholesterol removal, leading to high cholesterol levels.

Step by step solution

01

Understanding Familial Hypercholesterolemia

Familial hypercholesterolemia is a genetic condition characterized by high levels of low-density lipoprotein (LDL) cholesterol, commonly referred to as "bad" cholesterol, in the blood. This condition increases the risk of heart disease.
02

Genetic Basis of the Condition

Familial hypercholesterolemia is typically caused by mutations in the LDLR gene, the gene responsible for encoding the LDL receptor, which helps remove LDL cholesterol from the bloodstream. Due to these mutations, the body cannot effectively remove LDL cholesterol, leading to its accumulation in the blood.
03

Inheritance Patterns

The condition is often inherited in an autosomal dominant manner, meaning only one copy of the altered gene is needed to increase LDL cholesterol levels and cause familial hypercholesterolemia. This means a child can inherit the condition if one parent has the disease.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Genetic Mutations
Genetic mutations play a crucial role in the manifestation of familial hypercholesterolemia. They occur when there's an alteration in the DNA sequence of a gene, affecting its normal function. In the case of familial hypercholesterolemia, these mutations typically involve the LDLR gene, which is responsible for the production of LDL receptors on cell surfaces.

The LDLR gene mutation means the body struggles to effectively remove LDL cholesterol from the bloodstream.
  • Mutations can be as small as a single nucleotide change.
  • Most common are point mutations, insertions, or deletions.
  • Such changes may result in a truncated or dysfunctional protein.
In familial hypercholesterolemia, because the LDL receptors are either reduced in number or function abnormally, LDL cholesterol builds up in the bloodstream, leading to higher risks of heart-related issues.
LDL Cholesterol
LDL cholesterol stands for low-density lipoprotein cholesterol, which is often dubbed as 'bad cholesterol'. It plays a pivotal role in the context of familial hypercholesterolemia. High levels of LDL cholesterol in the blood can lead to plaque buildup in arteries, narrowing them and potentially leading to cardiovascular diseases.

Cholesterol itself is a necessary component of cell membranes and a precursor for hormone synthesis, but balance is crucial.
  • LDL particles transport cholesterol from the liver to cells throughout the body.
  • Excess LDL cholesterol can deposit in arteries, contributing to atherosclerosis.
  • Maintaining low levels is essential for heart health.
In familial hypercholesterolemia, due to genetic mutations, the removal of LDL cholesterol from the bloodstream is impaired, exacerbating these health risks.
Autosomal Dominant Inheritance
Autosomal dominant inheritance is a key concept for understanding how familial hypercholesterolemia is passed down through generations. This pattern of inheritance means that only one altered copy of the gene, inherited from either parent, is sufficient to cause the condition.

This is because the mutated gene is dominant over the normal one.
  • Each child has a 50% chance of inheriting the condition if one parent is affected.
  • The mutated gene is located on one of the autosomal chromosomes (not sex chromosomes).
  • Phenotypes can vary because of genetic background and environmental factors.
Understanding this inheritance pattern is critical for assessing risk and guiding decisions around genetic counseling and screening for familial hypercholesterolemia.

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Most popular questions from this chapter

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Several classes of LDL receptor mutations have been identified as causes of familial hypercholesterolemia. Suppose that you have been given cells from patients with different mutations, an antibody specific for the LDL receptor that can be seen with an electron microscope, and access to an electron microscope. What differences in antibody distribution might you expect to find in the cells from different patients?

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