GNE myopathy associated with congenital thrombocytopenia: A report of two siblings

Rumiko Izumi, Tetsuya Niihori, Naoki Suzuki, Yoji Sasahara, Takeshi Rikiishi, Ayumi Nishiyama, Shuhei Nishiyama, Kaoru Endo, Masaaki Kato, Hitoshi Warita, Hidehiko Konno, Toshiaki Takahashi, Maki Tateyama, Takeshi Nagashima, Ryo Funayama, Keiko Nakayama, Shigeo Kure, Yoichi Matsubara, Yoko Aoki, Masashi Aoki

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

GNE myopathy is an autosomal recessive muscular disorder caused by mutations in the gene encoding the key enzyme in sialic acid biosynthesis, UDP-N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase (GNE/MNK). Here, we report two siblings with myopathy with rimmed vacuoles and congenital thrombocytopenia who harbored two compound heterozygous GNE mutations, p.V603L and p.G739S. Thrombocytopenia, which is characterized by shortened platelet lifetime rather than ineffective thrombopoiesis, has been observed since infancy. We performed exome sequencing and array CGH to identify the underlying genetic etiology of thrombocytopenia. No pathogenic variants were detected among the known causative genes of recessively inherited thrombocytopenia; yet, candidate variants in two genes that followed an autosomal recessive mode of inheritance, including previously identified GNE mutations, were detected. Alternatively, it is possible that the decreased activity of GNE/MNK itself, which would lead to decreased sialic content in platelets, is associated with thrombocytopenia in these patients. Further investigations are required to clarify the association between GNE myopathy and the pathogenesis of thrombocytopenia.

Original languageEnglish
Pages (from-to)1068-1072
Number of pages5
JournalNeuromuscular Disorders
Volume24
Issue number12
DOIs
Publication statusPublished - 2014 Dec 1

Keywords

  • Distal myopathy with rimmed vacuoles
  • Exome sequencing
  • GNE
  • Sialic acid
  • Thrombocytopenia
  • UDP-N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Neurology
  • Clinical Neurology
  • Genetics(clinical)

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    Izumi, R., Niihori, T., Suzuki, N., Sasahara, Y., Rikiishi, T., Nishiyama, A., Nishiyama, S., Endo, K., Kato, M., Warita, H., Konno, H., Takahashi, T., Tateyama, M., Nagashima, T., Funayama, R., Nakayama, K., Kure, S., Matsubara, Y., Aoki, Y., & Aoki, M. (2014). GNE myopathy associated with congenital thrombocytopenia: A report of two siblings. Neuromuscular Disorders, 24(12), 1068-1072. https://doi.org/10.1016/j.nmd.2014.07.008