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Complement factor I deficiency associated with recurrent infections, vasculitis and immune complex
Ferah Genel1, Anders G Sjöholm, Lillemor Skattum
1ferahgen@yahoo.com
Scandinavian Journal of Infectious Diseases
|September 6, 2005
Summary
Complement factor I deficiency was identified in a young girl with recurrent infections and glomerulonephritis. This rare complement disorder affects immune system regulation, increasing susceptibility to bacterial infections.
Area of Science:
- Immunology
- Genetics
- Complement System
Background:
- The complement system is crucial for innate and adaptive immunity.
- Complement factor I (CFI) is essential for regulating complement activation.
- Deficiencies in CFI can lead to immune dysregulation and increased infection risk.
Observation:
- An 11-year-old girl from a consanguineous family presented with recurrent pyogenic infections, vasculitis, and glomerulonephritis.
- Clinical presentation and low C3 levels suggested a defect in complement activation regulation.
- Hemolytic activity assays revealed absent alternative pathway activity.
Findings:
- Analysis confirmed undetectable levels of complement factor I (<2%).
- Low levels of factor B and moderately low factor H were observed, consistent with secondary consumption.
- The patient's sister exhibited similar symptoms and low C3 levels, indicating familial inheritance.
Implications:
- This case highlights complement factor I deficiency as a cause of severe pyogenic infections and immune complex disease.
- Early diagnosis and management are critical for patients with complement factor I deficiency.
- Understanding CFI's role is vital for managing complement-mediated disorders and recurrent infections.