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. 1992 Jul;89(1):22–25. doi: 10.1111/j.1365-2249.1992.tb06871.x

Increased frequency of the long (S) allotype of CR1 (the C3b/C4b receptor, CD35) in patients with systemic lupus erythematosus.

P Cornillet 1, P Gredy 1, J L Pennaforte 1, O Meyer 1, M D Kazatchkine 1, J H Cohen 1
PMCID: PMC1554391  PMID: 1352746

Abstract

The allotypic forms of the C3b/C4b receptor (CR1, CD35) differ in length, in the number of expressed C3b binding sites and thus in their ability to mediate the processing of circulating C3- and C4-bearing immune complexes. We have used a combination of three informative restriction fragment length polymorphisms (RFLPs) to assess the frequencies of the F (most frequent allele comprised of four long homologous repeats (LHR)), S (five LHR) and F' (three LHR) alleles of the C3b/C4b receptor (CR1, CD35) in a French population of patients with systemic lupus erythematosus (SLE) (n = 63) and healthy controls (n = 158). A significantly higher frequency of the S phenotype was observed among patients (51%) as compared with controls (26%). The F' allele was found in 2/61 patients and 1/85 healthy controls, indicating the rare occurrence of the short CR1 allele in SLE. This allele is also extremely rare in the normal population. The overrepresentation of the S long allele among patients is indicative of a genetic linkage between CR1 and susceptibility to SLE.

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Selected References

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