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Novel mutation с.7348C>T in NF1 gene identified by whole­exome sequencing in patient with overlapping clinical symptoms of neurofibromatosis type 1 and bannayan­riley­ruvalcaba syndrome

Rahmani E.S., Azarpara H., Abazari M.F., Mohajeri M.R., Nasimi M., Ghorbani R., Azizpour A., Rahimi H.

Neurofibromatosis type 1 (NF-1) is an autosomal dominant disorder provoking benign cutaneous and nerve sheath tumors. The cutaneous tumors termed as plexiform neurofibromas, which some of them are extremely visible, and can influence the quality of life. They can also develop into invasive forms of carcinomas and infiltrate into multiple tissues, thus endangering the patient's life. The loss-of-function mutations in NF1 gene are responsible for NF-1 type. Due to the large size of NF1 gene (~ 350 kb and 60 exons), exist some pseudogenes on another locus, and lack mutation hotspot the molecular characterizing of patients is complex. In this study, we reported a patient showed symptoms of both NF-1 and Bannayan-Riley-Ruvalcaba syndrome (BRRS), then performed a whole-exome sequencing (WES) and a data analysis for molecular characterization. These results showed a single heterozygous nucleotide variant (c.7348C>T) in NF1 gene, which results in a premature stop codon (p.Arg2450Ter) and a truncated protein, causing clinical symptoms of the patient. According to the results, WES is a quick and cost-effective approach for molecular diagnosis of the mixed phenotype of NF-1.  

Key words: Neurofibromatosis type 1(NF-1); Bannayan-Riley-Ruvalcaba syndrome (BRRS); Whole-exome sequencing (WES); Neurofibromin; Bioinformatics; Molecular diagnosis

Tsitologiya i Genetika 2020, vol. 54, no. 4, pp. 87-89

1. Department of Medical Biotechnology, School of Allied Medicine, Iran University of Medical Science, Tehran, Iran
2. Department of Medicine, Iran University of Medical Science, Tehran, Iran
3. Department of Genetics, Tehran Medical Sciences Branch, Islamic Azad University, Tehran, Iran
4. Department of Dermatology Razi Hospital, Tehran University of Medical Science, Tehran, Iran
5. Department of Molecular Medicine, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran

E-mail: rahimi.h1981 gmail.com

Rahmani E.S., Azarpara H., Abazari M.F., Mohajeri M.R., Nasimi M., Ghorbani R., Azizpour A., Rahimi H. Novel mutation с.7348C>T in NF1 gene identified by whole­exome sequencing in patient with overlapping clinical symptoms of neurofibromatosis type 1 and bannayan­riley­ruvalcaba syndrome, Tsitol Genet., 2020, vol. 54, no. 4, pp. 87-89.

In "Cytology and Genetics":
Edris Sharif Rahmani, Hasan Azarpara, Mohammad Foad Abazari, Mohammad Reza Mohajeri, Maryam Nasimi, Raziyeh Ghorbani, Arghavan Azizpour & Hamzeh Rahimi Novel Mutation C.7348C>T in NF1 Gene Identified by Whole-Exome Sequencing in Patient with Overlapping Clinical Symptoms of Neurofibromatosis Type 1 and Bannayan–Riley–Ruvalcaba Syndrome, Cytol Genet., 2020, vol. 54, no. 4, pp. 353–362
DOI: 10.3103/S0095452720040106

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