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Structural and functional studies in C1q deficiency

R M Chapuis, G Hauptmann, E Grosshans

    Journal of Immunology (Baltimore, Md. : 1950)
    |October 1, 1982
    PubMed
    Summary
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    Two brothers with a severe lupus-like syndrome and a healthy sibling lacked hemolytic complement 1 (C1) activity due to dysfunctional C1q. This genetic disorder impacts complement function and immune response.

    Area of Science:

    • Immunology
    • Biochemistry
    • Genetics

    Background:

    • Complement system dysfunction can lead to immune dysregulation.
    • Deficiencies in early complement components are associated with autoimmune diseases.
    • Hereditary angioedema and lupus erythematosus are linked to complement component abnormalities.

    Observation:

    • Two brothers presented with absent hemolytic complement 1 (C1) activity.
    • One brother had a severe lupus-like syndrome; the other was healthy.
    • Both siblings exhibited depressed levels of C1q, with normal levels of other complement components.

    Findings:

    • The dysfunctional C1q lacked proper interaction with immunoglobulins and C1r/C1s.
    • Addition of normal C1q restored hemolytic activity, ruling out serum inhibitors.

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  • The abnormal C1q showed partial loss of antigenic determinants and increased molecular weight.
  • A genetically linked disorder affecting C1q function was suggested within the family.

    • Implications:

    • This study identifies a novel dysfunctional C1q variant.
    • Understanding C1q defects is crucial for diagnosing and managing autoimmune and immune deficiency disorders.
    • Further research into C1q structure-function relationships can elucidate complement-mediated disease mechanisms.