FALS with FUS mutation in Japan, with early onset, rapid progress and basophilic inclusion

Naoki Suzuki, Masashi Aoki, Hitoshi Warita, Masaaki Kato, Hideki Mizuno, Naoko Shimakura, Tetsuya Akiyama, Hirokazu Furuya, Toshihiro Hokonohara, Akiko Iwaki, Shinji Togashi, Hidehiko Konno, Yasuto Itoyama

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


Mutations in the fused in sarcoma (FUS, also known as translated in liposarcoma) gene have been recently discovered to be associated with familial amyotrophic lateral sclerosis (FALS) in African, European and American populations. In a Japanese family with FALS, we found the R521C FUS mutation, which has been reported to be found in various ethnic backgrounds. The family history revealed 23 patients with FALS among 46 family members, suggesting a 100% penetrance rate. They developed muscle weakness at an average age of 35.3 years, followed by dysarthria, dysphagia, spasticity and muscle atrophy. The average age of death was 37.2 years. Neuropathological examination of the index case revealed remarkable atrophy of the brainstem tegmentum characterized by cytoplasmic basophilic inclusion bodies in the neurons of the brainstem. We screened 40 FALS families in Japan and found 4 mutations (S513P, K510E, R514S, H517P) in exon 14 and 15 of FUS. Even in Asian races, FALS with FUS mutations may have the common characteristics of early onset, rapid progress and high penetrance rate, although in patients with the S513P mutation it was late-onset. Degeneration in multiple systems and cytoplasmic basophilic inclusion bodies were found in the autopsied cases.

Original languageEnglish
Pages (from-to)252-254
Number of pages3
JournalJournal of Human Genetics
Issue number4
Publication statusPublished - 2010 Apr


  • Amyotrophic lateral sclerosis (ALS)
  • Basophilic inclusion
  • Fused in sarcoma (FUS)


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