The FBN1 (R2726W) mutation is not fully penetrant

S. Buoni, R. Zannolli, F. Macucci, S. Ansaldi, M. Grasso, E. Arbustini, A. Fois

Research output: Contribution to journalArticlepeer-review


The R2726W mutation in the fibrillin 1 (FBN1, Marfan syndrome) gene segregates with isolated skeletal features of Marfan syndrome and/or high stature. Here we report a family in which two out of four individuals, an 18-year-old son and his mother, a 41-year-old woman, had the R2726W mutation of FBN1. Both family members carrying the mutation were of average height. The son had a Marfan-like phenotype, but his mother did not. The FBN1 R2776W mutation, which is associated with skeletal features of Marfan syndrome, appears incompletely penetrant. Consequently, genetic counselling in the presence of this mutation is difficult.

Original languageEnglish
Pages (from-to)633-638
Number of pages6
JournalAnnals of Human Genetics
Issue number6
Publication statusPublished - Nov 2004


  • Fibrillin gene
  • High stature
  • Marfanoid habitus

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics


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