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
- 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
See all genes and diseases
| GENE | OMIM DISEASES | INHERITANCE* | % GENE COVERAGE (20X) | HGMD** |
| LZTR1 | Noonan Syndrome, Schwannomatosis |
AD |
99.99 |
136 of 136 |
| MAP2K2 | Cardiofaciocutaneous Syndrome, Neurofibromatosis-Noonan Syndrome |
AD |
100 |
37 of 37 |
| NF1 | Juvenile Myelomonocytic Leukemia, Neurofibromatosis- Noonan Syndrome, Familial Spinal Neurofibromatosis Type 1, Watson Syndrome, 17q11.2 Microduplication Syndrome, Hereditary Pheochromocytoma- Paraganglioma |
AD |
97.97 |
3082 of 3166 |
| NF2 | Familial Meningioma, Neurofibromatosis Type 2, Schwannomatosis |
AD |
100 |
359 of 362 |
| SMARCB1 | Coffin-Siris Syndrome, Rhabdoid Tumor Predisposition Syndrome, Schwannomatosis |
AD |
100 |
97 of 99 |
| SPRED1 | Legius Syndrome |
AD |
100 |
84 of 84 |
* Inheritance: AD: Autosomal Dominant; AR: Autosomal Recessive; X: X linked; XLR: X linked Recessive; Mi: Mitochondrial; Mu: Multifactorial
** HGMD: Number of clinically relevant mutations according to HGMD
References
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
