Ryo Sakuma

Publications (2)0.94 Total impact

• Article: Familial inclusion body myositis: a report on two Japanese sisters.

  Maki Tateyama, Naohiro Saito, Kazuo Fujihara, Yusei Shiga, Atsushi Takeda, Koichi Narikawa, Takafumi Hasegawa, Yuzuru Taguchi, Ryo Sakuma, Yoshiaki Onodera, Ayumu Ohnuma, Muneshige Tobita, Yasuto Itoyama
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  ABSTRACT: Familial occurrence of inclusion body myositis is extremely rare, and only a few cases in Western countries have been reported. In these reports, a strong association of this disease with DR3 (DRB1*0301/0302) and the efficacy of immunosuppressants suggested that an immune pathomechanism is involved in the disease. We, for the first time, report two Japanese sisters who suffered myopathy clinicopathologically similar to inclusion body myositis. One sister received corticosteroid and azathioprine and the therapy relieved dysphagia. Both of our patients had DR15(2)/4 (DRB1*1502/0405), suggesting a distinct genetic association with the disease in the Japanese population.
  Internal Medicine 11/2003; 42(10):1035-8. · 0.94 Impact Factor
• Article: A novel two-base mutation in the CuZn superoxide dismutase gene associated with familial amyotrophic lateral sclerosis in Japan

  Mitsuya Morita, Masashi Aoki, Koji Abe, Takafumi Hasegawa, Ryo Sakuma, Yoshiaki Onodera, Nobumichi Ichikawa, Masatoyo Nishizawa, Yasuto Itoyama
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  ABSTRACT: We have identified a novel two-base mutation in exon 1 of the superoxide dismutase (SOD1) gene (T to T), which resulted in Cys6 to Phe substitution in a Japanese family with amyotrophic lateral sclerosis (ALS). This is the first case of familial ALS-associated two-base change of the SOD1 gene. Similar to several mutations in exon 1 of the SOD1 gene such as Ala4 to Val, Ala4 to Thr and Val14 to Met, affected members of the present family showed a rapid progression of motor dysfunction. Although Ala4, Cys6 and Val7 reside in the middle of the first β-strand of the SOD1, a family with a mutation of Val7 to Glu associates with slow progression of the disease. These findings suggest that clinical courses are variable with each mutation, even in the same exon.
  Neuroscience Letters.