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Neurological Sciences

Erschienen in:

14.04.2022 | Original Article

Adult-onset autosomal dominant leukodystrophy and neuronal intranuclear inclusion disease: lessons from two new Chinese families

verfasst von: Shuai Chen, Jin-Long Zou, Shuang He, Wei Li, Jie-Wen Zhang, Shu-Jian Li

Erschienen in: Neurological Sciences | Ausgabe 8/2022

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Abstract

Introduction

Adult-onset autosomal dominant leukodystrophy (ADLD) is a rare genetic leukoencephalopathy caused by duplication of the lamin B1 gene (LMNB1) or LMNB1 upstream deletions. Neuronal intranuclear inclusion disease (NIID) is another leukoencephalopathy due to GGC repeat expansion in the 5′-untranslated region of the NOTCH2NLC gene. Here, we report two Chinese ADLD families with neuroimaging and clinical features mimicking NIID.

Methods

We conducted detailed medical history inquiry, neurological examinations, and magnetic resonance imaging in the two families. Candidate gene sequencing and whole exome sequencing (WES) with copy number variation analysis were used to screen the genetic variations. The special points on the clinical and neuroimaging findings in the current families and differential diagnosis of ADLD with NIID are discussed.

Results

The two families presented with slowly progressive, multiple central nervous system symptoms, including spastic paraplegia, autonomic dysfunction, ataxia, deep sensory loss, and tremor. Clinical phenotypes were consistent within the family. Transient hypoglycemia and transient dilated pupils indicating autonomic dysfunctions were recorded for the first time in ADLD. Brain MRI showed band-like hyperintensities at the cortico-medullary junction on DWI, typical for NIID. Skin biopsy and genetic sequencing of the NOTCH2NCL gene did not support the diagnosis of NIID. Further whole exome sequencing (WES) identified the duplication mutation spanning the entire LMNB1 gene.

Conclusions

The novel feature of transient hypoglycemia and dilated pupils broadens the spectrum of autonomic dysfunction in ADLD. Clinical manifestations and neuroimaging of ADLD can mimic NIID. Although ADLD is even rarer than NIID, the differential diagnosis of these two diseases should not be confused.

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Titel: Adult-onset autosomal dominant leukodystrophy and neuronal intranuclear inclusion disease: lessons from two new Chinese families
verfasst von: Shuai Chen
Jin-Long Zou
Shuang He
Wei Li
Jie-Wen Zhang
Shu-Jian Li
Publikationsdatum: 14.04.2022
Verlag: Springer International Publishing
Erschienen in: Neurological Sciences / Ausgabe 8/2022
Print ISSN: 1590-1874
Elektronische ISSN: 1590-3478
DOI: https://doi.org/10.1007/s10072-022-06057-0

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