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Histopathology and fibrillin-1 distribution in severe early onset Marfan syndrome

K M Summers1, M Nataatmadja, D Xu

  • 1School of Molecular and Microbial Sciences, The University of Queensland, Queensland, Australia. K.Summers@uq.edu.au

American Journal of Medical Genetics. Part A
|October 14, 2005
PubMed

Insights

Marfan syndrome (MFS) is a genetic disorder affecting connective tissues. This study details a specific FBN1 gene mutation (C1044Y) causing severe MFS, with the patient surviving to age 14.

Area of Science:

  • Genetics
  • Molecular Biology
  • Pathology

Background:

  • Marfan syndrome (MFS) is an autosomal dominant disorder affecting multiple organ systems.
  • Mutations in the FBN1 gene, encoding fibrillin-1, are the primary cause of MFS.
  • Severe MFS cases often involve mutations in FBN1 exons 24-32, leading to early-onset cardiopulmonary failure.

Observation:

  • A patient with severe early-onset Marfan syndrome was studied.
  • Clinical, molecular, and histopathological data were collected.
  • The patient presented with a specific mutation in the FBN1 gene.

Findings:

  • The patient harbors a G>A transition at nucleotide 3131 in exon 25 of the FBN1 gene.
  • This mutation results in a cysteine to tyrosine substitution at amino acid position 1044 (C1044Y).
  • The C1044Y mutation led to extracellular matrix abnormalities and a severe clinical phenotype.

Implications:

  • This case highlights that survival to adolescence is possible even with severe FBN1 mutations.
  • Understanding genotype-phenotype correlations in MFS is crucial for patient management.
  • Further research into fibrillin-1 dysfunction can inform therapeutic strategies for Marfan syndrome.

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