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pubmed-article:1469300pubmed:abstractTextIn view of evidence suggesting vitiligo is an autoimmune disease, we investigated whether vitiligo is associated with inherited deficiencies of the fourth (C4) and second (C2) component of complement and with certain human leukocyte antigens (HLA). Analysis of functional activities of C4 and C2 in sera of patients with vitiligo (n = 42) showed that 17% of them had a heterozygous C4 deficiency and 5% had a heterozygous C2 deficiency. In the normal control group (n = 30), 3% had a heterozygous C4 deficiency and none had a C2 deficiency. C4 typing by Western blot analysis showed the frequency of the C4A*Q0 allele in the vitiligo patient group to be close to normal. However, the frequency of one C4B*Q0 allele was three times higher, and that of two C4B*Q0 alleles five times higher in the vitiligo patient group than the reported frequencies in normal control groups. Southern blot analysis of Taq1 digests of DNA using C4 and 21-hydroxylase probes showed that two patients with two C4B*Q0 alleles had a deletion of a 21-OHA-C4B segment. In the other patients, having one or two C4B*Q0 alleles, these null alleles probably occurred due to a loss of C4 gene expression. HLA analysis did not show any allelic association of C4A*Q0 or C4B*Q0 with any HLA antigen in vitiligo, but confirmed the previous findings of a negative association with HLA-DR3 and a positive association with HLA-DR4. These results suggest that abnormalities of the C4B gene and the above-mentioned associations with HLA antigens may be some of the risk factors in vitiligo.lld:pubmed
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pubmed-article:1469300pubmed:authorpubmed-author:AsgharS SSSlld:pubmed
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pubmed-article:1469300pubmed:dateRevised2005-11-17lld:pubmed
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pubmed-article:1469300pubmed:articleTitleMolecular heterogeneity of the fourth component of complement (C4) and its genes in vitiligo.lld:pubmed
pubmed-article:1469300pubmed:affiliationDepartment of Dermatology, University of Amsterdam, The Netherlands.lld:pubmed
pubmed-article:1469300pubmed:publicationTypeJournal Articlelld:pubmed
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