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Nat Genet. 2019 Aug;51(8):1222-1232. doi: 10.1038/s41588-019-0458-z. Epub 2019 Jul 22.

Noncoding CGG repeat expansions in neuronal intranuclear inclusion disease, oculopharyngodistal myopathy and an overlapping disease.

Author information

1
Department of Neurology, The University of Tokyo Hospital, Tokyo, Japan.
2
Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, Japan.
3
School of Bioscience and Biotechnology, Tokyo University of Technology, Tokyo, Japan.
4
Department of Integrative Genomics, Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan.
5
Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
6
Department of Neurology, National Center of Neurology and Psychiatry, Tokyo, Japan.
7
Department of Neurology, Kyorin University, Tokyo, Japan.
8
Department of Neurology, Maebashi Red Cross Hospital, Maebashi, Japan.
9
Institute of Medical Genomics, International University of Health and Welfare, Chiba, Japan.
10
Department of Rehabilitation Science, Kobe University Graduate School of Health Sciences, Kobe, Japan.
11
Department of Neurology and Neuropathology (the Brain Bank for Aging Research), Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Tokyo, Japan.
12
Department of Neurology, Osaka City University Graduate School of Medicine, Osaka, Japan.
13
Department of Neurology, Tokyo Teishin Hospital, Tokyo, Japan.
14
Department of Pathology and Laboratory Medicine, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan.
15
Department of Cell Physiology, Kyorin University School of Medicine, Tokyo, Japan.
16
Department of Neurology, Saitama Medical University, Saitama, Japan.
17
Department of Neurology, Jichi Medical University, Saitama Medical Center, Saitama, Japan.
18
Department of Geriatric Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
19
Department of Neurology, National Hospital Organization Higashisaitama Hospital, Saitama, Japan.
20
Department of Neurology, Ibaraki Prefectural University of Health Sciences, Ami, Japan.
21
Division of Neurology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.
22
Department of Neurology, International University of Health and Welfare Mita Hospital, Tokyo, Japan.
23
Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan.
24
Department of Neurology, The University of Tokyo Hospital, Tokyo, Japan. tsuji@m.u-tokyo.ac.jp.
25
Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. tsuji@m.u-tokyo.ac.jp.
26
Institute of Medical Genomics, International University of Health and Welfare, Chiba, Japan. tsuji@m.u-tokyo.ac.jp.

Abstract

Noncoding repeat expansions cause various neuromuscular diseases, including myotonic dystrophies, fragile X tremor/ataxia syndrome, some spinocerebellar ataxias, amyotrophic lateral sclerosis and benign adult familial myoclonic epilepsies. Inspired by the striking similarities in the clinical and neuroimaging findings between neuronal intranuclear inclusion disease (NIID) and fragile X tremor/ataxia syndrome caused by noncoding CGG repeat expansions in FMR1, we directly searched for repeat expansion mutations and identified noncoding CGG repeat expansions in NBPF19 (NOTCH2NLC) as the causative mutations for NIID. Further prompted by the similarities in the clinical and neuroimaging findings with NIID, we identified similar noncoding CGG repeat expansions in two other diseases: oculopharyngeal myopathy with leukoencephalopathy and oculopharyngodistal myopathy, in LOC642361/NUTM2B-AS1 and LRP12, respectively. These findings expand our knowledge of the clinical spectra of diseases caused by expansions of the same repeat motif, and further highlight how directly searching for expanded repeats can help identify mutations underlying diseases.

PMID:
31332380
DOI:
10.1038/s41588-019-0458-z

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