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01-05-2021 | Neurofibromatosis Type 1 | Original Article

Evaluation of clinical findings and neurofibromatosis type 1 bright objects on brain magnetic resonance images of 60 Turkish patients with NF1 gene variants

Authors: Filiz Hazan, Semra Gürsoy, Aycan Unalp, Unsal Yılmaz, Bengü Demirağ, Sultan Aydin Köker, Berk Ozyılmaz, Kadri Murat Erdogan, Önder Kalenderer, Serkan Erkuş, Müge Gürçınar, Ajlan Tükün

Published in: Neurological Sciences | Issue 5/2021

Abstract

Neurofibromatosis type 1 (NF1) is caused by mutations in the NF1 gene. This retrospective study aims to evaluate the clinical manifestations and brain magnetic resonance images (MRI) analysis in 60 genetically confirmed NF1 patients. The results of next-generation sequencing (NGS), Sanger sequencing, and MLPA of NF1 gene were evaluated. A total of 54 different variants were identified. Fourteen out of them were novel variants (25.9%). Patients who complied with NIH criteria had most frequently frameshift variants (11/32 patients), and those with only CALMs had missense variants (9/28 patients). Neurofibromatosis type 1 bright objects (NBOs) on T2-weighted MRI were detected in 42 patients (42/56; 75%). These brain lesions were detected mostly in basal ganglia and in cerebellar vermis. NBOs were detected more in the patients who complied with NIH criteria (80.6%) compared to those who were only CALMs (68%). While frameshift variants (33.3%) were the most common type variants in the patients who had NBOs, the most common variants were splicing (35.7%) and missense (35.7%) variants in the patients whose MRIs were normal. Frameshift variants (11/28 patients; 39.3%) were the most common in the patients with more than one brain locus involvement. Therefore, we consider that frameshift variants may be associated with increased incidence of NBOs and involvement of more than one brain locus. In addition, NBOs may occur less frequently in the patients with splicing variants. To our knowledge, this is the first study evaluated the relationship between NF1 gene variants and NBOs. Future studies may help us understand the etiology of NBOs.

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Title: Evaluation of clinical findings and neurofibromatosis type 1 bright objects on brain magnetic resonance images of 60 Turkish patients with NF1 gene variants
Authors: Filiz Hazan
Semra Gürsoy
Aycan Unalp
Unsal Yılmaz
Bengü Demirağ
Sultan Aydin Köker
Berk Ozyılmaz
Kadri Murat Erdogan
Önder Kalenderer
Serkan Erkuş
Müge Gürçınar
Ajlan Tükün
Publication date: 01-05-2021
Publisher: Springer International Publishing
Keyword: Neurofibromatosis Type 1
Published in: Neurological Sciences / Issue 5/2021
Print ISSN: 1590-1874
Electronic ISSN: 1590-3478
DOI: https://doi.org/10.1007/s10072-020-04988-0

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Evaluation of clinical findings and neurofibromatosis type 1 bright objects on brain magnetic resonance images of 60 Turkish patients with NF1 gene variants

Abstract

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Abstract

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