From the Yonsei University College of Medicine—Department of Laboratory Medicine, Seoul, South Korea (Dr. Lee); Departments of Laboratory Medicine, Samsung Medical Center, Sungkyankwan University School of Medicine, Seoul, South Korea (Ms. Jang, Sohn, Won, Kim, Dr. Kim); Department of Neurology, Samsung Medical Center, Sungkyankwan University School of Medicine, Seoul, South Korea (Dr. Chung).
Association Between a Polymorphism in the Lymphotoxin−a Promoter Region and Migraine
Version of Record online: 15 JUN 2007
Headache: The Journal of Head and Face Pain
Volume 47, Issue 7, pages 1056–1062, July/August 2007
How to Cite
Lee, K.-A., Jang, S. Y., Sohn, K.-M., Won, H. H., Kim, M. J., Kim, J.-W. and Chung, C.-S. (2007), Association Between a Polymorphism in the Lymphotoxin−a Promoter Region and Migraine. Headache: The Journal of Head and Face Pain, 47: 1056–1062. doi: 10.1111/j.1526-4610.2007.00847.x
- Issue online: 15 JUN 2007
- Version of Record online: 15 JUN 2007
- Accepted for publication February 20, 2007.
- tumor necrosis factor-α;
- single nucleotide polymorphism
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 TNFα in migraine have provided conflicting results. It has been reported that LTA could be a susceptibility gene in migraine. It is possible that the TNFα 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 TNFα 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.