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Lack of evidence of a specific role for C4A gene deficiency in determining disease susceptibility among C4-deficient patients with systemic lupus erythematosus (SLE).

Abstract：

:The aim of the present study was to investigate the prevalence of C4 and C2 deficiencies and to characterize genomic alterations in C4 genes in a large cohort of 125 unselected patients with SLE. We determined the protein concentration and functional activity of C2 and C4, as well as the C4 phenotype. C4 genotyping included Taq 1 restricted fragment lengh polymorphism (RFLP) analysis and polymerase chain reaction using sequence-specific primers (SSP-PCR). Type I C2 deficiency was diagnosed by PCR. Overall, 79.2% of the patients exhibited abnormalities of the C4 genes including deletion, non-expression, gene conversion and duplication. Among C4-deficient patients (n = 66, 52.8% prevalence), 41.0% of the patients exhibited a C4A deficiency and 59.0% a C4B deficiency. Half of the C4 deficiencies were due to a gene deletion. There was a strong association between C4A and C4B gene deletion and the presence of the DRB1*03 allele. Among the silent C4A genes, only two cases were related to a 2-bp insertion in exon 29 of the C4A gene. A gene conversion was demonstrated in eight patients (6.4%). One patient had a homozygous C4A deficiency. Three (2.4%) patients presented with a heterozygous type I C2 deficiency and none with homozygous deficiency. Our results argue against a specific role for C4A gene deficiency in determining disease susceptibility among patients with SLE that are C4-deficient.

journal_name

Clin Exp Immunol

journal_title

Clinical and experimental immunology

authors

Dragon-Durey MA,Rougier N,Clauvel JP,Caillat-Zucman S,Remy P,Guillevin L,Liote F,Blouin J,Ariey F,Lambert BU,Kazatchkine MD,Weiss L

doi

10.1046/j.1365-2249.2001.01438.x

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

133-9

issue

1

eissn

0009-9104

issn

1365-2249

pii

cei1438

journal_volume

123

pub_type

杂志文章

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