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[From gene to disease; hereditary multiple exostoses].

W Wuyts1, J V M G Bovée, P C W Hogendoorn

  • 1Universiteit Antwerpen, Centrum Medische Genetica, Antwerpen.

Nederlands Tijdschrift Voor Geneeskunde
|February 16, 2002
PubMed
Summary

Hereditary multiple exostoses (HME) is a genetic disorder causing bone tumors. Mutations in EXT1 and EXT2 genes are the primary cause, with diagnostic testing available.

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Area of Science:

  • Genetics
  • Oncology
  • Orthopedics

Context:

  • Hereditary multiple exostoses (HME) is an autosomal dominant skeletal disorder.
  • Characterized by the development of multiple osteochondromas (benign bone tumors).
  • Leads to significant skeletal deformities and potential complications.

Purpose:

  • To review the genetic basis of Hereditary Multiple Exostoses (HME).
  • To discuss the roles of the EXT1 and EXT2 genes in HME pathogenesis.
  • To highlight the availability of diagnostic germ-line mutation analysis.

Summary:

  • HME is genetically heterogeneous, with mutations in EXT1 (8q24) found in 44-66% of families and EXT2 (11p11-p12) in ~30%.
  • Evidence suggests a potential EXT3 gene linked to chromosome 19p.
  • Loss of both copies of the EXT1 tumor suppressor gene is implicated in osteochondroma formation.

Impact:

  • Understanding the genetic landscape of HME is crucial for accurate diagnosis.
  • Germ-line mutation analysis for EXT1 and EXT2 aids in clinical management.
  • Identifies the need for further research into potential novel genes like EXT3.

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