Deletions of SCN2A and SCN3A genes in a patient with West syndrome and autistic spectrum disorder

Pin Fee Chong, Hirotomo Saitsu, Yasunari Sakai, Toru Imagi, Ryoko Nakamura, Masaru Matsukura, Naomichi Matsumoto, Ryutaro Kira

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SCN2A encodes the alpha-subunit of voltage-gated sodium channel, Nav1.2, which is highly expressed at an early stage of the postnatal brain. Genetic studies revealed that de novo heterozygous mutations of SCN2A caused severe developmental disorders in childhood, such as autism and epileptic encephalopathy. However, few reports have demonstrated the cases carrying segmental deletions at the SCN2A locus for those with epileptic disorders. In this study, we report a 1.8-year-old boy, who presented with West syndrome in infancy and developed the sequelae of psychomotor delay and autism. Since whole-exome sequencing did not detect pathogenic mutations, we extensively searched for microdeletions and duplications by applying the eXome Hidden Markov Model (XHMM) for read depths of sequenced intervals. Using this approach, we identified a de novo deletion spanning the 1.1-Mb region of chromosome 2q24.3. We found that the deleted interval included the SCN2A and SCN3A loci. These data validate the utility of XHMM and support that SCN2A is involved in the pathogenic processes underlying epileptic encephalopathy in childhood.

元の言語英語
ページ(範囲)91-93
ページ数3
ジャーナルSeizure
60
DOI
出版物ステータス出版済み - 8 2018

All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology

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    Chong, P. F., Saitsu, H., Sakai, Y., Imagi, T., Nakamura, R., Matsukura, M., Matsumoto, N., & Kira, R. (2018). Deletions of SCN2A and SCN3A genes in a patient with West syndrome and autistic spectrum disorder. Seizure, 60, 91-93. https://doi.org/10.1016/j.seizure.2018.06.012