Abstract
Purpose
This study aimed to explore the ocular characteristics of neuronal intranuclear inclusion disease (NIID), caused by GGC repeat expansion in the NOTCH2NLC gene, combined with the systemic clinical manifestations, and propose early diagnostic features of NIID.
Methods
Six patients (12 eyes) were enrolled in this study. In vivo corneal confocal microscopy (IVCCM), fundus photography, fundus autofluorescence (FAF) imaging, optical coherence tomography (OCT), full-field electroretinography (ERG), and electromyography were performed.
Results
The average corneal nerve fiber density (CNFD) was 6.83 ± 4.96 number/mm2, and the corneal nerve fiber length (CNFL) was 6.76 ± 1.96 mm/mm2. The nerves were looser and more curved in affected individuals. Dendritic cells were observed in patients with NIID. Chorioretinal atrophy, hyper-AF spots, and outer retinal abnormalities were observed during FAF imaging and OCT examinations. In full-field ERGs, the amplitudes of the a-wave and b-wave reduced or extinguished over time. The compound muscle action potential and motor nerve conduction velocity of the left common peroneal nerve decreased substantially.
Conclusion
The findings of IVCCM and retinal changes should be included in the diagnostic criteria for NIID. Corneal confocal characteristics may precede the systemic neurological manifestations and provide a clinical basis for the early treatment and staging of the disease.
ClincalTrials.gov. Identifier: ChiCTR21000500227.
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Data availability
All data generated or analysed during this study are included in this submitted article.
Code availability
All code generated or used during the study appear in the submitted article.
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Funding
This work is supported by the National Natural Science Foundation of China (grant no. 81973910) (China) and the Clinical Study of Shanghai Municipal Health Commission (grant no. 20194Y0290) (China). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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Li Cao and Da Long contributed to the conception of the study; Chang Liu and Xinghua Luan performed the experiment and wrote the manuscript; Xiaohong Liu and Xiangning Wang contributed significantly to analysis and manuscript preparation; Tingting Li performed the data analyses; Xuan Cai helped perform the analysis with constructive discussions.
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This study was approved by the Ethical Committee of Shanghai Jiao Tong University Affiliated Sixth People’s Hospital (no. 2021-KY-041(K)). The study was conducted in accordance with the tenets of the Declaration of Helsinki.
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Chang Liu and Xinghua Luan contributed equally to this work.
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Liu, C., Luan, X., Liu, X. et al. Characteristics of ocular findings of patients with neuronal intranuclear inclusion disease. Neurol Sci 43, 3231–3237 (2022). https://doi.org/10.1007/s10072-021-05748-4
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DOI: https://doi.org/10.1007/s10072-021-05748-4