HLA-linked C2 deficiency in a Dutch patient with systemic lupus erythematosus
- PMID: 469009
- PMCID: PMC1145732
- DOI: 10.1136/jcp.32.6.528
HLA-linked C2 deficiency in a Dutch patient with systemic lupus erythematosus
Abstract
A patient with systemic lupus erythematosus was studied whose blood serum on repeated occasions showed undetectable levels of haemolytic omplement (C). A detailed investigation of individual C components in the serum of the proposita and her family revealed the absence of functional C2 in the patient and half-normal values in the relatives. C4 levels in the family, but not in the patient, were above normal, whereas the levels of factor B were low in all cases. No abnormalities were noted in C3, C9, or C1INH. Tissue typing showed linkage of the C2-deficiency gene with the HLA-A10/B18 and A9/B18 haplotypes. No linkage with red cell antigens and no relationship with plasma kallikrein levels was found.
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