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February 2016; 2 (1) ArticleOpen Access

Tubular aggregate myopathy caused by a novel mutation in the cytoplasmic domain of STIM1

Hidehiko Okuma, Fumiaki Saito, Jun Mitsui, Yuji Hara, Yuki Hatanaka, Miki Ikeda, Teruo Shimizu, Kiichiro Matsumura, Jun Shimizu, Shoji Tsuji, Masahiro Sonoo
First published February 1, 2016, DOI: https://doi.org/10.1212/NXG.0000000000000050
Hidehiko Okuma
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Fumiaki Saito
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Jun Mitsui
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Yuji Hara
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Yuki Hatanaka
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Miki Ikeda
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Teruo Shimizu
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Kiichiro Matsumura
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Jun Shimizu
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Shoji Tsuji
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Masahiro Sonoo
From the Department of Neurology (H.O., F.S., Y. Hatanaka, M.I., K.M., M.S.), School of Medicine, and Department of Sport and Medical Science (T.S.), Faculty of Medical Technology, Teikyo University, Tokyo, Japan; Department of Neurology (J.M., J.S., S.T.), Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; and Department of Synthetic Chemistry and Biological Chemistry (Y. Hara), Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Citation
Tubular aggregate myopathy caused by a novel mutation in the cytoplasmic domain of STIM1
Hidehiko Okuma, Fumiaki Saito, Jun Mitsui, Yuji Hara, Yuki Hatanaka, Miki Ikeda, Teruo Shimizu, Kiichiro Matsumura, Jun Shimizu, Shoji Tsuji, Masahiro Sonoo
Neurol Genet Feb 2016, 2 (1) e50; DOI: 10.1212/NXG.0000000000000050

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Abstract

Objective: To identify the gene mutation of tubular aggregate myopathy (TAM) and gain mechanistic insight into the pathogenesis of the disorder.

Methods: We described a family affected by autosomal dominant TAM and performed exome and Sanger sequencing to identify mutations. We further analyzed the functional significance of the identified mutation by expression studies and intracellular Ca2+ measurements.

Results: A 42-year-old man presented with slowly progressive muscle weakness and atrophy in all 4 limbs and the trunk. Muscle biopsy and microscopic examination revealed tubular aggregates in his skeletal muscle. Genetic analysis of this family identified a novel heterozygous mutation, c.1450_1451insGA (p.Ile484ArgfsX21), in stromal interaction molecule 1 (STIM1), a Ca2+ sensor in sarcoplasmic reticulum. We transfected cultured cells with STIM1 and demonstrated that the mutant STIM1 exhibited aggregation-like appearance in shrunk cytoplasm. Furthermore, we revealed that the intracellular Ca2+ influx is decreased by the mutant STIM1.

Conclusions: The novel mutation p.Ile484ArgfsX21 is located in the cytoplasmic C-terminal inhibitory domain (CTID) of STIM1. However, all mutations reported so far in TAM reside in the luminal N-terminal EF hand region. The aggregation-like appearance of STIM1 and the decreased intracellular Ca2+ influx in cells transfected with CTID mutant are in sharp contrast to these previous reports. Taken together, these findings indicate that mutations of STIM1 cause TAM through the dysregulation of Ca2+ homeostasis.

GLOSSARY

CTID=
C-terminal inhibitory domain;
H&E=
hematoxylin and eosin;
mRNA=
messenger RNA;
RT=
reverse transcriptase;
SOCE=
store-operated Ca2+ entry;
SR=
sarcoplasmic reticulum;
STIM1=
stromal interaction molecule 1;
TAM=
tubular aggregate myopathy;
TR=
tetrazolium reductase

Footnotes

  • Funding information and disclosures are provided at the end of the article. Go to Neurology.org/ng for full disclosure forms. The Article Processing Charge was paid by the authors.

  • Received March 17, 2015.
  • Accepted in final form December 7, 2015.
  • © 2016 American Academy of Neurology

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND), which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially.

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