Premium
Association Between a Polymorphism in the Lymphotoxin −a Promoter Region and Migraine
Author(s) -
Lee KyungA,
Jang Soo Yeon,
Sohn KwangMin,
Won Hong Hee,
Kim Min Ji,
Kim JongWon,
Chung ChinSang
Publication year - 2007
Publication title -
headache: the journal of head and face pain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.14
H-Index - 119
eISSN - 1526-4610
pISSN - 0017-8748
DOI - 10.1111/j.1526-4610.2007.00847.x
Subject(s) - linkage disequilibrium , haplotype , lymphotoxin alpha , migraine , allele , genetics , lymphotoxin , electrophoretic mobility shift assay , single nucleotide polymorphism , promoter , chromatin immunoprecipitation , odds ratio , biology , medicine , tumor necrosis factor alpha , gene , genotype , gene expression
Objective.—The aim of this study was to determine whether polymorphisms in the lymphotoxin ( LTA )‐tumor necrosis factor ( TNF ) region are associated with the risk of migraine. Background.—Previous studies concerning the role of TNF α in migraine have provided conflicting results. It has been reported that LTA could be a susceptibility gene in migraine. It is possible that the TNF α polymorphism associated with migraine is in linkage disequilibrium with other functional polymorphisms that influence migraine risk. Moreover, there are significant differences among the allele frequencies of TNF gene variants among populations from different ethnic groups. Methods.—In a case‐control study, including 439 migraine patients and 382 controls, we examined the association between 15 single nucleotide polymorphisms in the coding and promoter regions of LTA and TNF α genes, which are located within the 22 kb around TNF and the risk of migraine. We performed a chromatin immunoprecipitation (ChIP) assay and an electrophoretic mobility shift assay (EMSA) to identify differential protein‐DNA binding of LTA ‐294. Results.—Homozygosity for the LTA ‐294C allele was significantly associated with an increased risk of migraine compared with CT/TT carriers (corrected P = .005, odds ratio [OR]= 1.7, 95% confidence interval [CI] 1.3‐2.3). Haplotype TGAAC was found to be significantly associated with a protective effect against migraine ( P = .0005, Bonferroni corrected P = .003, OR = 0.7, 95% CI 0.5‐0.8). There was no differential protein‐DNA binding pattern in both EMSA and ChIP assays. Conclusions.—We found that the LTA haplotypes were associated with migraine among Koreans and that the best marker for this is the LTA ‐294 T/C polymorphism. Our results indicate that these associations should be defined in the context of the involvement of other genetically linked region, such as human leukocyte antigen ( HLA ) loci.