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SMAD4 mutation segregating in a family with juvenile polyposis, aortopathy, and mitral valve dysfunction

Sara Andrabi1, Mir Reza Bekheirnia, Patricia Robbins-Furman

  • 1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA.

American Journal of Medical Genetics. Part A
|April 6, 2011
PubMed

Insights

Juvenile polyposis syndrome (JPS) linked to SMAD4 mutations also increases risk for hereditary hemorrhagic telangiectasia (HHT). This study identifies aortic and mitral valve disease in a JPS patient with a SMAD4 mutation, suggesting broader cardiovascular risks.

Area of Science:

  • Genetics
  • Cardiovascular Medicine
  • Gastroenterology

Background:

  • Juvenile polyposis syndrome (JPS) is genetically linked to SMAD4 or BMPR1A mutations.
  • SMAD4 mutations in JPS patients increase the risk of hereditary hemorrhagic telangiectasia (HHT).
  • HHT involves SMAD4 or other genes modulating transforming growth factor-beta (TGFβ) signaling, including FBN1, TGFBR1, and TGFBR2, which are associated with Marfan syndrome and Loeys-Dietz syndrome.

Observation:

  • A family history positive for aortopathy, mitral valve dysfunction, and JPS was observed.
  • Mutation analysis revealed a SMAD4 mutation responsible for these phenotypes within the family.
  • This is the first reported case of aortic and mitral disease presenting with JPS in an individual with a SMAD4 mutation.

Findings:

  • SMAD4 mutations are implicated in JPS, HHT, and potentially aortic and mitral valve disease.
  • The study highlights a novel association between SMAD4 mutations and cardiovascular abnormalities beyond HHT.
  • The findings suggest that SMAD4 mutations may confer a broader risk profile than previously understood.

Implications:

  • Individuals with SMAD4 mutations should be monitored for cardiovascular complications, including aortic dilation and mitral valve dysfunction.
  • Comprehensive medical history review is crucial before molecular testing, particularly for asymptomatic patients.
  • This expands the clinical spectrum associated with SMAD4 mutations, impacting diagnostic and management strategies.

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