Fibrillin-1 (FBN1) gene frameshift mutations in Marfan patients: Genotype-phenotype correlation

Guglielmina Pepe, B. Giusti, L. Evangelisti, M. C. Porciani, T. Brunelli, L. Giurlani, M. Attanasio, R. Fattori, C. Bagni, P. Comeglio, R. Abbate, G. F. Gensini

Research output: Contribution to journalArticle

Abstract

Marfan syndrome (MFS) is a multisystemic disease associated with mutations in the fibrillin-1 gene. Most of the reported mutations are missense substitutions mainly affecting the epidermal growth factor (EGF)-like protein domain structure and the calcium-binding (cb) site. The aim of our study was to investigate the correlation between fibrillin-1 frameshift mutations and the clinical phenotype in patients affected by MFS. In 48 out of 66 Marfan patients a pathogenetic mutation was found. We detected novel mutations causing premature termination codon in exons 19, 37, 40 and 41 of four Italian patients. The first mutation in exon 19 (cbEGF # 8 domain) results in a clinical phenotype involving mainly the skeletal and cardiovascular systems. Interestingly, we noticed that, while mutations in exons 37 and 41 (eight cysteine domains # 4 and # 5) are mildet, the mutation in exon 40 (cbEGF # 24 domain) is more severe and causes major cardiovascular involvement with thoracic and abdominal aortic aneurysms. It is noteworthy that the degree of the severity in the phenotype of one of our patients and another from the literature carrying a mutation in exon 41 could be explained with alterations in mRNA expression.

Original languageEnglish
Pages (from-to)444-450
Number of pages7
JournalClinical Genetics
Volume59
Issue number6
DOIs
Publication statusPublished - 2001

Keywords

  • Aortic aneurysm
  • Fibrilin-1 gene
  • Frameshift mutations
  • Marfan syndrome
  • MASS

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

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    Pepe, G., Giusti, B., Evangelisti, L., Porciani, M. C., Brunelli, T., Giurlani, L., Attanasio, M., Fattori, R., Bagni, C., Comeglio, P., Abbate, R., & Gensini, G. F. (2001). Fibrillin-1 (FBN1) gene frameshift mutations in Marfan patients: Genotype-phenotype correlation. Clinical Genetics, 59(6), 444-450. https://doi.org/10.1034/j.1399-0004.2001.590610.x