C3 Deficiency of Classical Pathway

C3 Deficiency of Classical Pathway (Proteins | Antibodies | Genes | ELISA Kits)

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C3 Deficiency of Classical Pathway Background

C3 is cleaved by C4b2a, releasing C3a and leaving C3b, the major opsonin of the complement system. C3b also acts on C5 to initiate the MAC (C5b-C9). C3 deficiency results in impaired opsonization and impaired initiation of the final common pathway (MAC). C3 deficiency is extremely rare with only 27 reported cases among 19 families worldwide. Individuals deficient in C3 usually have less than 1% of normal levels of C3 antigenically and functionally. C3 deficiency rarely leads to systemic lupus erythematosus / SLE-like disease, rather it typically results in recurrent pyogenic infections and membrano-proliferative glomerulonephritis / MPGN. Infections are often caused by N. meningitidis, H. influenzae, Enterobacter aerogenes, and Escherichia coli. Respiratory tract infections are prominent, including pneumonia, tonsillitis, sinusitis, and otitis. Renal disease, including MPGN and mesangiocapillary glomerulonephritis, has been seen in 26% of reported cases of C3 deficiency. An SLE-like syndrome with fever, vasculitic skin lesions, and arthritis has been seen in 28% of reported cases of C3 deficiency.

C3 Deficiency of Classical Pathway References

1. Pettigrew H D, et al. (2009). Clinical significance of complement deficiencies. Annals of the New York Academy of Sciences, 1173(1), 108-123.
2. Botto M. (1999). C1q knock-out mice for the study of complement deficiency in autoimmune disease. Experimental and clinical immunogenetics, 15(4), 231-234.

Complement System
Complement System Overview
Complement System Component / Protein Regulator and Receptor
Complement Genetic Feature
Complement Activation Pathways
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Complement System and Diseases
Complement System Deficiency Diseases
Classical Pathway Deficiency+
- C1q Deficiency of Classical Pathway
- C2 Deficiency of Classical Pathway
- C3 Deficiency of Classical Pathway
- C1 Inhibitor/C1-INH Deficiency of Classical Pathway
Alternative Pathway Deficiency
Complement Receptor Deficiency
Mannose-Binding Lectin / MBL Pathway Deficiency
Membrane Attack Complex/MAC Deficiency
Total Complement Activity / CH50 / CH100
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Anti-Complement Antibody Products