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Genomics Precision Diagnostic > Neurology Precision Panel > Neurofibromatosis Precision Panel

Neurofibromatosis  Precision Panel

Neurofibromatosis type 1 (NF1) and type 2 (NF2) are neurocutaneous congenital disorders that affect organs of ectodermal origin including skin, central nervous system, and the eyes.
Overview
Indication
Clinical Utility
Genes & Diseases
Methodology
References

Overview

  • Neurofibromatosis type 1 (NF1) and type 2 (NF2) are neurocutaneous congenital disorders that affect organs of ectodermal origin including skin, central nervous system, and the eyes. All are inherited in an autosomal dominant pattern and are characterized by a high rate of mutational change occurring for the first time in an individual as well as variable expression. NF1 and NF2 differ with regards to their age of onset, clinical manifestations, gene loci, and gene protein products. However, in both conditions, the altered gene products have a crucial role in the dysregulation of tumor suppression. NF1, also known as von Recklinghausen syndrome, includes effects on multiple systems of the body and the major associated tumor is the neurofibroma. In addition, clinical manifestations include bone dysplasia, learning disabilities, and increased risk of malignancy. NF2 includes schwannomas of multiple cranial and spinal nerves, among others.   

  • The Igenomix Neurofibromatosis Precision Panel  can serve as a diagnostic tool ultimately leading to a better management and prognosis of the disease. It provides a comprehensive analysis of the genes involved in this disease using next-generation sequencing (NGS) to fully understand the spectrum of relevant genes involved, and their high or intermediate penetrance. 

Indication

  • The Igenomix Neurofibromatosis Precision Panel is indicated in patients with a clinical suspicion or diagnosis of Neurofibromatosis type 1 or type 2 presenting with the following manifestations: 
    • Multiple neurofibromas 
    • Café au lait spots 
    • Lisch nodules (pigmented iris hamartomas) 
    • Seizures and/or focal neurologic signs 
    • Intellectual disability 
    • Bone involvement: scoliosis, short stature, fractures, cortical thinning etc 
    • Associated with other tumors: pheochromocytoma, Wilms tumor, meningiomas, ependymomas 
    • Bilateral vestibular schwannomas (acoustic neuroma)
    • Early-onset cataracts 

Clinical Utility

The clinical utility of this panel is: 

  • The genetic and molecular diagnosis for an accurate clinical diagnosis of a symptomatic patient.  
  • Early initiation of treatment with a multidisciplinary team for appropriate surveillance for malignancy, appropriate laser treatment and/or chemotherapy, surgical resection of tumors as well as orthopaedic intervention. 
  • Risk assessment of asymptomatic family members according to the mode of inheritance .
  • Improved pathways from diagnosis to treatment in susceptible populations. 

Genes & Diseases

Methodology

References

See scientific referrals

Plotkin, S. R., & Wick, A. (2018). Neurofibromatosis and Schwannomatosis. Seminars in neurology, 38(1), 73–85. https://doi.org/10.1055/s-0038-1627471 

Korf B. R. (2013). Neurofibromatosis. Handbook of clinical neurology, 111, 333–340. https://doi.org/10.1016/B978-0-444-52891-9.00039-7 

Spyk, S., Thomas, N., Cooper, D., & Upadhyaya, M. (2011). Neurofibromatosis type 1-associated tumours: Their somatic mutational spectrum and pathogenesis. Human Genomics, 5(6), 623. doi: 10.1186/1479-7364-5-6-623 

Pemov, A., Dewan, R., Hansen, N., Chandrasekharappa, S., Ray-Chaudhury, A., & Jones, K. et al. (2020). Comparative clinical and genomic analysis of neurofibromatosis type 2-associated cranial and spinal meningiomas. Scientific Reports, 10(1). doi: 10.1038/s41598-020-69074-z 

Farschtschi, S., Mautner, V. F., McLean, A., Schulz, A., Friedrich, R. E., & Rosahl, S. K. (2020). The Neurofibromatoses. Deutsches Arzteblatt international, 117(20), 354–360. https://doi.org/10.3238/arztebl.2020.0354 

Cimino, P. J., & Gutmann, D. H. (2018). Neurofibromatosis type 1. Handbook of clinical neurology, 148, 799–811. https://doi.org/10.1016/B978-0-444-64076-5.00051-X 

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