Balkan Journal of Medical Genetics (2018-12-01)

Next generation sequencing identified a novel multi exon deletion of the NF1 gene in a Chinese pedigree with neurofibromatosis type 1

  • Yang J,
  • An J-X,
  • Liu X-L,
  • Wang Z-Q,
  • Xie G-M,
  • Yang X-L,
  • Xu S-J,
  • Feng F,
  • Ni Y

Journal volume & issue
Vol. 21, no. 2
pp. 45 – 48


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Neurofibromatosis type 1 (NF1) is a genetic disease involving neurocutaneous abnormalities. Neurofibromatosis type 1 is an autosomal dominant disorder characterized by the neurofibromas and café-au-lait spots. Mutation in the NF 1 gene causes NF1. The NF 1 gene encodes neurofibromin. In this study, we found a 31-year-old Chinese boy with NF1. He presented only with café-au-lait spots over the whole body. The proband’s mother had a severe phenotype with neurofibroma and café-au-lait macules over her whole body, mostly in the facial region. A novel multi exon deletion c.(4661+1_4662-1)_(5748+1_5749-1)del; [EX36_39DEL] on the NF 1 gene has been identified in the proband. Quantitative real-time polymerase chain reaction (qPCR) confirmed that this mutation is co-segregated well and was inherited from the proband’s mother. The mutation was absent in the proband’s father and normal individuals. The novel multi exon deletion results in the formation of a truncated NF1 protein that caused the NF1 phenotype in this family. Our present study also emphasized the significance of rapid, accurate and cost-effective screening for the patient with NF1 by next generation sequencing (NGS).