Anaplastic astrocytoma

Rare genetic disorder affecting albumin production

Analbuminaemia is a rare genetic disorder characterized by the absence or severe reduction of albumin in the blood plasma. Albumin is a vital protein produced by the liver, playing a crucial role in maintaining the oncotic pressure necessary for proper distribution of body fluids between body tissues and the bloodstream. This condition is inherited in an autosomal recessive manner.

Pathophysiology

Albumin is the most abundant protein in human plasma, accounting for about 60% of the total plasma protein. It is essential for maintaining the colloid osmotic pressure of the blood, which prevents the leakage of fluid from the blood vessels into the tissues. In individuals with analbuminaemia, the absence of albumin leads to a compensatory increase in other plasma proteins, such as globulins, to maintain oncotic pressure. However, this compensation is often inadequate, leading to various clinical manifestations.

Clinical Features

Patients with analbuminaemia may present with a range of symptoms, although some individuals remain asymptomatic. Common clinical features include:

• Edema: Due to the reduced oncotic pressure, fluid may accumulate in the interstitial spaces, leading to swelling, particularly in the lower extremities.
• Hyperlipidemia: Elevated levels of lipids in the blood are often observed, as albumin plays a role in lipid transport.
• Fatigue and muscle weakness: These symptoms may result from the body's inability to maintain proper fluid and electrolyte balance.
• Hypotension: Low blood pressure can occur due to the reduced blood volume.

Diagnosis

The diagnosis of analbuminaemia is typically made through laboratory tests that reveal low or undetectable levels of albumin in the blood. Genetic testing can confirm the diagnosis by identifying mutations in the albumin gene (ALB) responsible for the condition.

Management

There is no specific treatment for analbuminaemia. Management focuses on alleviating symptoms and preventing complications. This may include:

• Dietary modifications to manage hyperlipidemia.
• Diuretics to reduce edema.
• Monitoring and managing blood pressure.

Prognosis

The prognosis for individuals with analbuminaemia varies. Some individuals may lead relatively normal lives with minimal symptoms, while others may experience significant complications. Regular monitoring and supportive care are essential to manage the condition effectively.

Genetics

Analbuminaemia is inherited in an autosomal recessive pattern, meaning that an individual must inherit two copies of the mutated gene, one from each parent, to be affected. Carriers, who have only one copy of the mutation, typically do not show symptoms.

Related pages

• Albumin
• Hypoalbuminemia
• Genetic disorder
• Autosomal recessive inheritance

Gallery

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  Diagram illustrating autosomal recessive inheritance.