Thoracic Aortic Aneurysm in Infancy in Aneurysms-Osteoarthritis Syndrome Due to a Novel SMAD3 Mutation: Further Delineation of the Phenotype

Anita Wischmeijer, Lut Van Laer, Giada Tortora, Nikhita Ajit Bolar, Guy Van Camp, Erik Fransen, Nils Peeters, Roberto di Bartolomeo, Davide Pacini, Gaetano Gargiulo, Simone Turci, Marco Bonvicini, Elisabetta Mariucci, Luigi Lovato, Stefano Brusori, Marco Ritelli, Marina Colombi, Livia Garavelli, Marco Seri, Bart L. Loeys

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, mutations in the SMAD3 gene were found to cause a new autosomal dominant aneurysm condition similar to Loeys-Dietz syndrome (LDS), mostly with osteoarthritis, called aneurysms-osteoarthritis syndrome (AOS). Our 3-year-old propositus underwent correction of an inguinal hernia at 3 months and substitution of the ascending aorta for pathologic dilation at 12 months of age. Family history reveals aortic dilation in his mother at 30 years, death due to aortic dissection of an 18-year-old maternal aunt, surgical replacement of the ascending aorta because of aneurysm in a maternal uncle at 19 years, postpartum death of the maternal grandmother at 24 years and surgical intervention because of thoracic aortic aneurysm in a brother of the propositus' grandmother at 54 years. The affected individuals present with several other signs of connective tissue disease, but the two adult patients evaluated revealed no radiologic evidence of osteoarthritis. Molecular testing of the TGFBR1 and TGFBR2 genes, involved in LDS, resulted negative, but analysis of SMAD3 disclosed the novel heterozygous loss-of-function mutation c.1170_1179del (p.Ser391AlafsX7) in exon 9 in all affected family members, confirming the diagnosis of AOS. SMAD3 mutations should be considered in patients of all ages with LDS-like phenotypes and negative TGFBR1/2 molecular tests, especially in the presence of aortic root or ascending aortic aneurysms, even though signs of early onset osteoarthritis are absent.

Original languageEnglish
Pages (from-to)1028-1035
Number of pages8
JournalAmerican Journal of Medical Genetics, Part A
Volume161
Issue number5
DOIs
Publication statusPublished - May 2013

Keywords

  • Aneurysms-osteoarthritis syndrome
  • Connective tissue disorder
  • SMAD3
  • Thoracic aortic aneurysm

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

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