GENETIC ANALYSES OF THE NF1 GENE IN TURKISH NEUROFIBROMATOSIS TYPE I PATIENTS AND DEFINITION OF THREE NOVEL VARIANTS
Ulusal SD1,*, Gürkan H1, Atlı E1, Özal SA2, Çiftdemir M3, Tozkır H1, Karal Y4, Güçlü H2, Eker D1, Görker I5
*Corresponding Author: Dr. Selma D. Ulusal, Department of Medical Genetics, Trakya University Faculty of Medicine, D100, Edirne, Turkey. Tel: +90-284-235-7642/2330. Fax: +90-284-235-7652. E-mail: selmaulusal@trakya.edu.tr
page: 13
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Abstract

Neurofibromatosis Type I (NF1) is a multi systemic autosomal dominant neurocutaneous disorder predisposing patients to have benign and/or malignant lesions predominantly of the skin, nervous system and bone. Loss of function mutations or deletions of the NF1 gene is responsible for NF1 disease. Involvement of various pathogenic variants, the size of the gene and presence of pseudogenes makes it difficult to analyze. We aimed to report the results of 2 years of multiplex ligation-dependent probe amplification (MLPA) and next generation sequencing (NGS) for genetic diagnosis of NF1 applied at our genetic diagnosis center. The MLPA, semiconductor sequencing and Sanger sequencing were performed in genomic DNA samples from 24 unrelated patients and their affected family members referred to our center suspected of having NF1. In total, three novel and 12 known pathogenic variants and a whole gene deletion were determined. We suggest that next generation sequencing is a practical tool for genetic analysis of NF1. Deletion/duplication analysis with MLPA may also be helpful for patients clinically diagnosed to carry NF1 but do not have a detectable mutation in NGS. Keywords: Genetic diagnosis; Neurofibromatosis type I (NF1); Next generation sequencing (NGS); multiplex ligation-dependent probe amplification (MLPA).



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