Case-control study with narcoleptic patients and healthy controls who, like the patients, possess both HLA-DRB1*1501
H Hohjoh1, N Terada, T Nakayama
1Department of Human Genetics, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. hohjohh@m.u-tokyo.ac.jp
Abstract:
In previous studies, we suggested that the tumor necrosis factor (TNF-alpha and its receptor 2 (TNFR2) genes could be associated with the susceptibility to human narcolepsy, and that haplotype carrying DRB1*1502 had a negative association with the disorder. To further evaluate these associations, we herein compared narcoleptic patients with healthy individuals who, like the patients, possessed both DRB1*1501 and DQB1*0602. Results agreed with the negative association of DRB1*1502 and positive association of the TNF-alpha(-857T) and TNFR2-196R combination with the disorder. In addition, a significant association of the TNF-alpha(-857T) homozygote with the disorder and an increase in a rare haplotype carrying DRB1*1501 and TNF-alpha(-857T) in the patients were also observed in the present study.
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