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Recurrent CTNNB1 mutations in craniofacial osteomas.

Daniel Baumhoer1, Ruth Berthold2,3, Ilka Isfort2,3

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Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc
|November 2, 2021
PubMed
Summary
This summary is machine-generated.

Osteomas are benign bone tumors. Genetic analysis reveals mutations in the CTNNB1 gene (encoding β-catenin) are common in sporadic osteomas, suggesting WNT/β-catenin signaling is key to their development.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Osteomas are benign bone tumors, primarily affecting craniofacial bones.
  • While often sporadic, some osteomas are linked to Gardner syndrome, involving APC gene mutations and WNT/β-catenin signaling.
  • The molecular drivers of sporadic osteomas remain largely uncharacterized.

Purpose of the Study:

  • To investigate the genetic basis of sporadic, non-syndromal osteomas.
  • To determine the role of WNT/β-catenin signaling in osteoma pathogenesis.

Main Methods:

  • Sequencing analysis of CTNNB1 gene in 36 sporadic osteomas.
  • NanoString multiplex expression profiling on a subset of cases.

Main Results:

  • Hotspot mutations in the CTNNB1 gene were identified in 61.1% of sporadic osteomas.
  • CTNNB1 mutations were associated with β-catenin stabilization and segregated into a distinct "WNT-cluster" based on expression profiling.
  • The S45P variant was the most frequent CTNNB1 alteration.

Conclusions:

  • Osteomas are genetically driven neoplasms.
  • Aberrant WNT/β-catenin signaling is fundamentally involved in osteoma pathogenesis.
  • CTNNB1 mutations can serve as a diagnostic marker for challenging osteoma cases.