Complement 2 deficiency

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Complement 2 deficiency
Synonyms	C2 deficiency
Pronounce
Specialty	Immunology
Symptoms	Increased susceptibility to bacterial infections, autoimmune diseases
Complications	N/A
Onset
Duration
Types
Causes	Genetic mutation in the C2 gene
Risks
Diagnosis	Genetic testing, complement system assays
Differential diagnosis	Other complement deficiencies
Prevention
Treatment	Antibiotics for infections, management of autoimmune conditions
Medication
Prognosis	Variable, depending on severity and management
Frequency	Rare
Deaths

Complement 2 deficiency is a rare genetic disorder that affects the immune system. It is characterized by a deficiency in the complement system, specifically the absence or malfunction of complement component 2 (C2). This deficiency can lead to increased susceptibility to infections and autoimmune diseases.

Pathophysiology

The complement system is a crucial part of the innate immune response, consisting of a series of small proteins that enhance the ability of antibodies and phagocytic cells to clear pathogens from an organism. Complement component 2 is a part of the classical pathway of complement activation. In individuals with complement 2 deficiency, the classical pathway is impaired, leading to reduced opsonization and clearance of pathogens.

Clinical Manifestations

Patients with complement 2 deficiency may present with recurrent bacterial infections, particularly with encapsulated organisms such as Streptococcus pneumoniae and Neisseria meningitidis. They may also have an increased risk of developing autoimmune conditions such as systemic lupus erythematosus (SLE).

Diagnosis

Diagnosis of complement 2 deficiency is typically made through laboratory testing. This includes measuring the levels of complement components in the blood and assessing the functional activity of the complement pathways. Genetic testing can confirm mutations in the C2 gene.

Treatment

There is no specific cure for complement 2 deficiency. Management focuses on preventing infections through vaccination and prophylactic antibiotics. In cases of autoimmune disease, immunosuppressive therapy may be required.

Prognosis

The prognosis for individuals with complement 2 deficiency varies depending on the severity of the deficiency and the presence of associated conditions. With appropriate management, many individuals can lead relatively normal lives.

See Also

• Complement system
• Autoimmune disease
• Immune deficiency