Fibrous dysplasia.
Steven A Lietman1, Michael A Levine
1Musculoskeletal Tumor Center, Cleveland Clinic, Cleveland, OH 44195, USA. LIETMAS@ccf.org
Pediatric Endocrinology Reviews : PER
|July 18, 2013
Summary
Fibrous dysplasia, a bone disorder, is linked to GNAS gene mutations. Targeting the Wnt/β-catenin pathway offers potential new therapies for this condition.
Area of Science:
- Bone biology and developmental disorders
- Molecular genetics and pathophysiology
- Endocrinology and skeletal abnormalities
Background:
- Fibrous dysplasia is a bone developmental abnormality with disorganized fibrous tissue and immature bone.
- It can be monostotic (single lesion) or polyostotic (multiple lesions), and is sometimes part of McCune-Albright syndrome (MAS) with endocrine issues and skin macules.
- Activating GNAS mutations are implicated in MAS and fibrous dysplasia, with GNAS acting as a gsp oncogene.
Purpose of the Study:
- To elucidate the molecular underpinnings of fibrous dysplasia and McCune-Albright syndrome.
- To explore the role of the Wnt/β-catenin pathway in the pathogenesis of fibrous dysplasia.
- To identify potential therapeutic targets for fibrous dysplasia and MAS.
Main Methods:
- Analysis of GNAS gene mutations in affected tissues.
- Investigation of the Wnt/β-catenin signaling pathway activation in relation to GNAS mutations.
- Review of radiographic features and current conservative surgical approaches.
Main Results:
- Activating GNAS mutations are identified in a subset of fibrous dysplasia and MAS cases.
- Gas mutations were shown to activate Wnt/β-catenin signaling.
- Classic radiographic findings include a ground-glass appearance due to defective mineralization.
Conclusions:
- Fibrous dysplasia has a known molecular etiology involving GNAS gene mutations.
- Wnt/β-catenin pathway inhibition presents a promising therapeutic strategy.
- Further research into molecular pathology may lead to improved conservative treatments for fibrous dysplasia and MAS.
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