دورية أكاديمية
RARS1‐related hypomyelinating leukodystrophy: Expanding the spectrum
| العنوان: | RARS1‐related hypomyelinating leukodystrophy: Expanding the spectrum |
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| المؤلفون: | Marisa I. Mendes, Lydia M. C. Green, Enrico Bertini, Davide Tonduti, Chiara Aiello, Desiree Smith, Ettore Salsano, Shanice Beerepoot, Jozef Hertecant, Sarah vonSpiczak, John H. Livingston, Lisa Emrick, Jamie Fraser, Laura Russell, Genevieve Bernard, Stefania Magri, Daniela Di Bella, Franco Taroni, Mary K. Koenig, Isabella Moroni, Gerarda Cappuccio, Nicola Brunetti‐Pierri, Jullie Rhee, Bryce A. Mendelsohn, Ingo Helbig, Katherine Helbig, Hiltrud Muhle, Omar Ismayl, Adeline L. Vanderver, Gajja S. Salomons, Marjo S. van derKnaap, Nicole I. Wolf |
| المصدر: | Annals of Clinical and Translational Neurology, Vol 7, Iss 1, Pp 83-93 (2020) |
| بيانات النشر: | Wiley, 2020. |
| سنة النشر: | 2020 |
| المجموعة: | LCC:Neurosciences. Biological psychiatry. Neuropsychiatry LCC:Neurology. Diseases of the nervous system |
| مصطلحات موضوعية: | Neurosciences. Biological psychiatry. Neuropsychiatry, RC321-571, Neurology. Diseases of the nervous system, RC346-429 |
| الوصف: | Abstract Objective Biallelic variants in RARS1, encoding the cytoplasmic tRNA synthetase for arginine (ArgRS), cause a hypomyelinating leukodystrophy. This study aimed to investigate clinical, neuroradiological and genetic features of patients with RARS1‐related disease, and to identify possible genotype‐phenotype relationships. Methods We performed a multinational cross‐sectional survey among 20 patients with biallelic RARS1 variants identified by next‐generation sequencing techniques. Clinical data, brain MRI findings and genetic results were analyzed. Additionally, ArgRS activity was measured in fibroblasts of four patients, and translation of long and short ArgRS isoforms was quantified by western blot. Results Clinical presentation ranged from severe (onset in the first 3 months, usually with refractory epilepsy and early brain atrophy), to intermediate (onset in the first year with nystagmus and spasticity), and mild (onset around or after 12 months with minimal cognitive impairment and preserved independent walking). The most frequent RARS1 variant, c.5A>G, led to mild or intermediate phenotypes, whereas truncating variants and variants affecting amino acids close to the ArgRS active centre led to severe phenotypes. ArgRS activity was significantly reduced in three patients with intermediate and severe phenotypes; in a fourth patient with intermediate to severe presentation, we measured normal ArgRS activity, but found translation mainly of the short instead of the long ArgRS isoform. Interpretation Variants in RARS1 impair ArgRS activity and do not only lead to a classic hypomyelination presentation with nystagmus and spasticity, but to a wide spectrum, ranging from severe, early‐onset epileptic encephalopathy with brain atrophy to mild disease with relatively preserved myelination. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2328-9503 |
| Relation: | https://doaj.org/toc/2328-9503 |
| DOI: | 10.1002/acn3.50960 |
| URL الوصول: | https://doaj.org/article/0451d47dda844ada9b1700050648a958 |
| رقم الأكسشن: | edsdoj.0451d47dda844ada9b1700050648a958 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 23289503 |
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| DOI: | 10.1002/acn3.50960 |