P.Arg1809Cys substitution in neurofibromin is associated with a distinctive NF1 phenotype without neurofibromas

Valentina Pinna, Valentina Lanari, Paola Daniele, Federica Consoli, Emanuele Agolini, Katia Margiotti, Irene Bottillo, Isabella Torrente, Alessandro Bruselles, Caterina Fusilli, Anna Ficcadenti, Sara Bargiacchi, Eva Trevisson, Monica Forzan, Sandra Giustini, Chiara Leoni, Giuseppe Zampino, Maria Cristina Digilio, Bruno Dallapiccola, Maurizio ClementiMarco Tartaglia, Alessandro De Luca

Research output: Contribution to journalArticlepeer-review

Abstract

Analysis of 786 NF1 mutation-positive subjects with clinical diagnosis of neurofibromatosis type 1 (NF1) allowed to identify the heterozygous c.5425C>T missense variant (p.Arg1809Cys) in six (0.7%) unrelated probands (three familial and three sporadic cases), all exhibiting a mild form of disease. Detailed clinical characterization of these subjects and other eight affected relatives showed that all individuals had multiple cafè-au-lait spots, frequently associated with skinfold freckling, but absence of discrete cutaneous or plexiform neurofibromas, Lisch nodules, typical NF1 osseous lesions or symptomatic optic gliomas. Facial features in half of the individuals were suggestive of Noonan syndrome. Our finding and revision of the literature consistently indicate that the c.5425C>T change is associated with a distinctive, mild form of NF1, providing new data with direct impact on genetic counseling and patient management.

Original languageEnglish
Pages (from-to)1068-1071
Number of pages4
JournalEuropean Journal of Human Genetics
Volume23
Issue number8
DOIs
Publication statusPublished - Aug 21 2015

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

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