Abstract
The etiology of systemic lupus erythematosus (SLE) is very complex, and genetic factors appear to play a significant role in susceptibility to SLE, in determining the disease expression, and in the autoantibody profiles of individuals with SLE. DNA methyltransferase-1 (DNMT1) is a major enzyme that determines genomic methylation patterns and both maintains methyltransferase and exhibits de novo DNA methylation activity in vivo. In order to clarify the association of DNMT1 polymorphisms with SLE, we scrutinized the genetic polymorphisms in exons and their boundaries of DNMT1, including the -1,500 bp promoter region, by direct sequencing in 24 Korean individuals. Twenty-nine sequence variants were identified: two in 5'UTR, six in exons, and 21 in introns. Eight of these polymorphisms were selected for a larger-scale genotyping (n=680) by considering their allele frequencies, haplotype-tagging status, and linkage disequilibrium coefficiencies (LDs) among polymorphisms. The associations between DNMT1 polymorphisms and the clinical profiles of SLE were analyzed. No significant associations with the risk of SLE were detected. However, further analyses of association with autoantibody production among SLE patients revealed that one no...Continue Reading
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