Clinical variability and characteristic autoantibody profile in primary C1q complement deficiency

G. Vassallo, R. W. Newton, S. E. Chieng, M. R. Haeney, A. Shabani, Peter D. Arkwright

    Research output: Contribution to journalArticlepeer-review


    Objectives. C1q deficiency is a rare inherited defect in the early part of the complement cascade. In this report, we describe the varied clinical features of patients with this condition as well as the characteristic autoantibody profile. Methods. A large Pakistani family with a high degree of consanguinity is described in which the father and five sons have C1q deficiency, all with different clinical manifestations. Results. Clinical features of C1q deficiency can vary from almost no disease to fulminant bacterial infection and localized lupus-like skin, renal or CNS disease. Autoantibodies to ribonucleoproteins such as anti-Sm and Ro, but not dsDNA, were present. Conclusions. Awareness of the spectrum of clinical disease, autoantibody profiles and tests required to confirm the diagnosis of C1q deficiency are important if this life-threatening immunodeficiency disease is to be managed correctly. © The Author 2007. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved.
    Original languageEnglish
    Pages (from-to)1612-1614
    Number of pages2
    Issue number10
    Publication statusPublished - Oct 2007


    • C1q
    • Complement
    • Meningitis
    • SLE
    • Vasculitis


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