Familial deficiency of two subunits of the first component of complement. c1r and c1s associated with a lupus erythematosus‐like disease

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Abstract
Complete absence of C1r and almost complete absence of C1s were found in 4 of 8 living siblings. Two of the 4 suffer from a syndrome that combines discoid lupus erythematosus and nondeforming rheumatoid‐like arthritis; one of the siblings has mild nephritis. The other 2 C1 deficient family members are clinically well. Evidence from this and other families suggests that deficiency of C1 components or C4 is associated with higher risk of developing a lupus‐like disease than is deficiency of C2.