PRRT2 mutation in Japanese children with benign infantile epilepsy |
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Authors: | Akihisa Okumura Keiko Shimojima Tetsuo Kubota Shinpei Abe Shintaro Yamashita Katsumi Imai Tohru Okanishi Hideo Enoki Tatsuya Fukasawa Takuya Tanabe Leanne M Dibbens Toshiaki Shimizu Toshiyuki Yamamoto |
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Institution: | 1. Department of Pediatrics, Juntendo University Faculty of Medicine, Japan;2. Tokyo Womens’ Medical University, Institute for Integrated Medical Sciences, Japan;3. Department of Pediatrics, Anjo Kosei Hospital, Japan;4. Department of Pediatrics, Juntendo Nerima Hospital, Japan;5. National Epilepsy Center, Shizuoka Institute of Epilepsy and Neurological Disorders, Japan;6. Department of Child Neurology, Seirei Hamamatsu General Hospital, Japan;g Tanabe-Kadobayashi Children’s Clinic, Japan;h Epilepsy Research Program, School of Pharmacy and Medical Sciences, University of South Australia, Australia |
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Abstract: | Mutations in PRRT2 genes have been identified as a major cause of benign infantile epilepsy and/or paroxysmal kinesigenic dyskinesia. We explored mutations in PRRT2 in Japanese patients with BIE as well as its related conditions including convulsion with mild gastroenteritis and benign early infantile epilepsy. We explored PRRT2 mutations in Japanese children who had had unprovoked infantile seizures or convulsion with mild gastroenteritis. The probands included 16 children with benign infantile epilepsy, 6 children with convulsions with mild gastroenteritis, and 2 siblings with benign early infantile epilepsy. In addition, we recruited samples from family members when PRRT2 mutation was identified in the proband. Statistical analyses were performed to identify differences in probands with benign infantile epilepsy according to the presence or absence of PRRT2 mutation. Among a total of 24 probands, PRRT2 mutations was identified only in 6 probands with benign infantile epilepsy. A common insertion mutation, c.649_650insC, was found in 5 families and a novel missense mutation, c.981C>G (I327M), in one. The family history of paroxysmal kinesigenic dyskinesia was more common in probands with PRRT2 mutations than in those without mutations. Our study revealed that PRRT2 mutations are common in Japanese patients with benign infantile epilepsy, especially in patients with a family history of paroxysmal kinesigenic dyskinesia. |
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Keywords: | PRRT2 Benign infantile epilepsy Paroxysmal kinesigenic dyskinesia Japanese children |
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