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Inherited C2 Deficiency and Systemic Lupus Erythematosus: Studies on a Family

[+] Article, Author, and Disclosure Information

Grant support: National Institute of Health grants AM08490, TI AM05548, AM11414, AM05577, and FR05669. Dr. Osterland is a recipient of the American Cancer Society Senior Faculty Award.

▸Requests for reprints should be addressed to C. K. Osterland, M.D., Royal Victoria Hospital, 687 Pine West, Montreal H3A 1A1, Quebec, Canada.

St. Louis, Missouri, and Boston, Massachusetts

Ann Intern Med. 1975;82(3):323-328. doi:10.7326/0003-4819-82-3-323
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A patient is described in which an inherited defect in the synthesis of C2 complement component coexisted with the disease systemic lupus erythematosus. The family studies show evidence of the autosomal recessive nature of the inheritance of the C2 synthesis defect. Of particular interest was the finding of a great-aunt who also had homozygous C2 deficiency. This great-aunt suffered from discoid lupus erythematosus as well. The occurrence of various autoantibodies in the serum from the family members, the typing for blood groups, HL-A antigens, and some serum protein markers are reported and discussed. The C2 deficiency may be a critical defect in the host defenses to infection that predisposed to the development of autoimmune disease.





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