Novel missense mutation in CLN8 in late infantile neuronal ceroid lipofuscinosis: The first report of a CLN8 mutation in Japan

Yu Katata, Mitsugu Uematsu, Hiroki Sato, Sato Suzuki, Tojo Nakayama, Yuki Kubota, Tomoko Kobayashi, Naomi Hino-Fukuyo, Hirotomo Saitsu, Shigeo Kure

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Neuronal ceroid lipofuscinoses (NCLs) are clinically and genetically heterogeneous neurodegenerative lysosomal diseases. Fourteen distinct NCL subtypes (CLN1-CLN14) are known, and they are caused by mutations in different genes. CLN8 was first identified in Finnish patients, and the phenotype was subsequently found in Turkish, Italian, and Pakistani patients. We report a 6-year-old Japanese boy with NCL with a novel missense mutation in CLN8. At the age of 3 years, he manifested frequent drop seizures, and then progressively developed motor difficulties with an ataxic gait, myoclonus, left conjugate deviation, and rotational nystagmus. At age 5, he developed profound visual difficulty and dysphagia, and he has now lost his mobility. A bone marrow examination at age 5 showed sea-blue histiocytes. An electroretinogram was non-recordable. No giant somatosensory evoked potentials were found. Brain magnetic resonance imaging revealed bilateral diffuse hyperintensities in the white matter around the lateral ventricles and cerebellar and pontine atrophy on T2-weighted images. In a lysosomal enzyme study, the palmitoyl-protein-thioesterase and pepinase activity was within normal limits. Whole-exome sequencing revealed a homozygous CLN8 mutation: c.620T>G (p.L207R). His parents were both heterozygous for this mutation. To our knowledge, this is the first report of a CLN8 mutation in late infantile NCL in Japan.

Original languageEnglish
Pages (from-to)341-345
Number of pages5
JournalBrain and Development
Volume38
Issue number3
DOIs
Publication statusPublished - 2016 Mar 1

Keywords

  • CLN8
  • Late infantile neuronal ceroid lipofuscinosis
  • Progressive myoclonic epilepsy
  • Whole-exome sequence

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Developmental Neuroscience
  • Clinical Neurology

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