Volume 79, Issue 2 pp. 231-243
Research Article

ADSSL1 mutation relevant to autosomal recessive adolescent onset distal myopathy

Hyung Jun Park MD

Hyung Jun Park MD

Department of Neurology, Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, South Korea

Department of Neurology, Yonsei University College of Medicine, Seoul, South Korea

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Young Bin Hong PhD

Young Bin Hong PhD

Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea

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Young-Chul Choi MD, PhD

Young-Chul Choi MD, PhD

Department of Neurology, Yonsei University College of Medicine, Seoul, South Korea

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Jinho Lee MD

Jinho Lee MD

Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea

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Eun Ja Kim MD

Eun Ja Kim MD

Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea

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Ji-Su Lee

Ji-Su Lee

Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, South Korea

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Won Min Mo MS

Won Min Mo MS

Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea

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Soo Mi Ki MS

Soo Mi Ki MS

Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, South Korea

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Hyo In Kim

Hyo In Kim

Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, South Korea

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Hye Jin Kim

Hye Jin Kim

Department of Biological Science, Kongju National University, Gongju, South Korea

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Young Se Hyun PhD

Young Se Hyun PhD

Department of Biological Science, Kongju National University, Gongju, South Korea

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Hyun Dae Hong

Hyun Dae Hong

Department of Biological Science, Kongju National University, Gongju, South Korea

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Kisoo Nam

Kisoo Nam

Department of Chemistry, New York University, New York, NY

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Sung Chul Jung MD, PhD

Sung Chul Jung MD, PhD

Department of Biochemistry, Ewha Womans University School of Medicine, Seoul, South Korea

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Sang-Beom Kim MD, PhD

Sang-Beom Kim MD, PhD

Department of Neurology, Kyung Hee University College of Medicine, Kangdong Hospital, Seoul, South Korea

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Se Hoon Kim MD, PhD

Se Hoon Kim MD, PhD

Department of Pathology, Yonsei University College of Medicine, Seoul, South Korea

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Deok-Ho Kim PhD

Deok-Ho Kim PhD

Department of Bioengineering, University of Washington, Seattle, WA

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Ki-Wook Oh MD

Ki-Wook Oh MD

Department of Neurology, College of Medicine, Hanyang University, Seoul, South Korea

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Seung Hyun Kim MD, PhD

Seung Hyun Kim MD, PhD

Department of Neurology, College of Medicine, Hanyang University, Seoul, South Korea

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Jeong Hyun Yoo MD, PhD

Jeong Hyun Yoo MD, PhD

Department of Radiology, Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, South Korea

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Ji Eun Lee PhD

Corresponding Author

Ji Eun Lee PhD

Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, South Korea

Samsung Genome Institute, Samsung Medical Center, Seoul, South Korea

Address correspondence to Dr Byung-Ok Choi, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro Gangnam-gu, Seoul 06351, Korea. E-mail: [email protected]; Dr Ki Wha Chung, Kongju National University, 56 Gongjudaehak-ro, Gongju, Chungnam 32588, Korea. E-mail: [email protected]; Dr Ji Eun Lee, Samsung Advanced Institute for Health Science & Tech., Samsung Genome Institute (SGI), Samsung Medical Center, Sungkyunkwan University, 81 Irwon-ro, Gangnam-gu, Seoul 06351, Korea. E-mail: [email protected]Search for more papers by this author
Ki Wha Chung PhD

Corresponding Author

Ki Wha Chung PhD

Department of Biological Science, Kongju National University, Gongju, South Korea

Address correspondence to Dr Byung-Ok Choi, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro Gangnam-gu, Seoul 06351, Korea. E-mail: [email protected]; Dr Ki Wha Chung, Kongju National University, 56 Gongjudaehak-ro, Gongju, Chungnam 32588, Korea. E-mail: [email protected]; Dr Ji Eun Lee, Samsung Advanced Institute for Health Science & Tech., Samsung Genome Institute (SGI), Samsung Medical Center, Sungkyunkwan University, 81 Irwon-ro, Gangnam-gu, Seoul 06351, Korea. E-mail: [email protected]Search for more papers by this author
Byung-Ok Choi MD, PhD

Corresponding Author

Byung-Ok Choi MD, PhD

Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea

Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, South Korea

Neuroscience Center, Samsung Medical Center, Seoul, South Korea

Address correspondence to Dr Byung-Ok Choi, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro Gangnam-gu, Seoul 06351, Korea. E-mail: [email protected]; Dr Ki Wha Chung, Kongju National University, 56 Gongjudaehak-ro, Gongju, Chungnam 32588, Korea. E-mail: [email protected]; Dr Ji Eun Lee, Samsung Advanced Institute for Health Science & Tech., Samsung Genome Institute (SGI), Samsung Medical Center, Sungkyunkwan University, 81 Irwon-ro, Gangnam-gu, Seoul 06351, Korea. E-mail: [email protected]Search for more papers by this author
First published: 27 October 2015
Citations: 43

Abstract

Objective

Distal myopathy is a heterogeneous group of muscle diseases characterized by predominant distal muscle weakness. A study was done to identify the underlying cause of autosomal recessive adolescent onset distal myopathy.

Methods

Four patients from 2 unrelated Korean families were evaluated. To isolate the genetic cause, exome sequencing was performed. In vitro and in vivo assays using myoblast cells and zebrafish models were performed to examine the ADSSL1 mutation causing myopathy pathogenesis.

Results

Patients had an adolescent onset distal myopathy phenotype that included distal dominant weakness, facial muscle weakness, rimmed vacuoles, and mild elevation of serum creatine kinase. Exome sequencing identified completely cosegregating compound heterozygous mutations (p.D304N and p.I350fs) in ADSSL1, which encodes a muscle-specific adenylosuccinate synthase in both families. None of the controls had both mutations, and the mutation sites were located in well-conserved regions. Both the D304N and I350fs mutations in ADSSL1 led to decreased enzymatic activity. The knockdown of the Adssl1 gene significantly inhibited the proliferation of mouse myoblast cells, and the addition of human wild-type ADSSL1 reversed the reduced viability. In an adssl1 knockdown zebrafish model, muscle fibers were severely disrupted, which was evaluated by myosin expression and birefringence. In these conditions, supplementing wild-type ADSSL1 protein reversed the muscle defect.

Interpretation

We suggest that mutations in ADSSL1 are the novel genetic cause of the autosomal recessive adolescent onset distal myopathy. This study broadens the genetic and clinical spectrum of distal myopathy and will be useful for exact molecular diagnostics. Ann Neurol 2016;79:231–243

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