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Systemic lupus erythematosus with C1q deficiency
N M Stone1, A Williams, J D Wilkinson
1Department of Dermatology, Department of Immunology, Oxford Radcliffe Hospital, Old Road, Headington, Oxford OX3 7LJ, U.K.
The British Journal of Dermatology
|March 29, 2000
Summary
Systemic lupus erythematosus (SLE) can be linked to C1q deficiency, a rare complement disorder. This case highlights severe SLE manifestations in a child with undetectable C1q levels.
Area of Science:
- Immunology
- Rheumatology
- Genetics
Background:
- Systemic lupus erythematosus (SLE) is a chronic autoimmune disease with diverse clinical presentations.
- Complement system deficiencies, particularly early components, are associated with increased risk of autoimmune disorders.
- C1q is the first component of the classical complement pathway, crucial for immune complex clearance.
Observation:
- A pediatric patient presented with cutaneous lupus at age 6.
- The patient subsequently developed Raynaud's phenomenon, alopecia, oral ulcerations, and seizures secondary to cerebral vasculitis.
- Complement C3 and C4 levels were normal during lupus flares, with absent hemolytic complement activity.
Findings:
- No C1q protein was detected in the patient's serum.
- The clinical and laboratory findings strongly suggest a diagnosis of C1q deficiency.
- This deficiency was associated with severe, early-onset systemic lupus erythematosus.
Implications:
- C1q deficiency is a significant risk factor for developing SLE, particularly severe forms.
- Early diagnosis of C1q deficiency is crucial for managing autoimmune manifestations.
- Understanding the role of C1q in SLE pathogenesis may lead to novel therapeutic strategies.