A variant of childhood-onset myasthenia gravis: HLA typing and clinical characteristics in Japan |
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Authors: | Shinomiya Noriaki Nomura Yoshiko Segawa Masaya |
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Affiliation: | Second Department of Pediatrics, Ohashi Hospital, Toho University School of Medicine, Meguro, Tokyo, Japan. noriaki@med.toho-u.ac.jp |
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Abstract: | To investigate the correlation between clinical features and HLA DR/DQ genetic variability in myasthenia gravis (MG), we evaluated HLA DR/DQ allele frequencies in 87 Japanese patients with childhood-onset disease. HLA genotypes DRB1*1302/DQA1*0102/DQB1*0604 and DRB1*0901/DQA1*0301/DQB1*0303 were significantly higher in patients than in healthy controls (P(c) < 0.0001, RR = 5.5; P(c) < 0.0001, RR = 8.5, for two genotypes, respectively). Patients who had a significantly higher likelihood of the HLA types DRB1*1302/DQA1*0102/DQB1*0604 or DRB1*0901/DQA1*0301/DQB1*0303 belonged to the latent general type (LG) of MG; this is clinically ocular type, but shows myasthenic electromyographic findings in extremity muscles. The LG type of MG was observed in 78% of patients exhibiting the clinically ocular type; this group comprised approximately 75% of patients with childhood-onset MG. These date suggest that LG type of MG may present a particular subset of childhood-onset MG, which is associated with the specific HLA subtypes DRB1*1302/DQA1*0102/DQB1*0604 and DRB1*0901/DQA1*0301/DQB1*0303. |
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Keywords: | Myasthenia gravis with childhood onset Anti-acetylcholine receptor antibody Ocular symptoms Latent general type HLA DR/DQ haplotype |
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