[Genetic basis for skeletal disease. Molecular advances in sclerosing bone disorders]

Area of Science:

• Bone biology and skeletal disorders.

Context:

• Sclerosing bone disorders involve either reduced osteoclastic bone resorption or increased bone formation.
• Osteopetrosis, a prime example of impaired resorption, presents as a heterogeneous disease with newly identified causative molecules.
• Infantile malignant osteopetrosis has distinct osteoclast-rich and osteoclast-poor subtypes, linked to osteoclast dysfunction and impaired osteoclastogenesis, respectively.

Purpose:

• To review the molecular underpinnings of sclerosing bone disorders.
• To highlight recent molecular discoveries in osteopetrosis and related conditions.

Summary:

• Sclerosing bone disorders arise from dysregulated bone remodeling processes.
• Osteopetrosis, characterized by impaired bone resorption, is genetically diverse, with recent identification of responsible molecules.
• Molecular analyses reveal the roles of transforming growth factor-beta (TGF-beta) and Wnt signaling in regulating bone mass in disorders of increased bone formation.

Impact:

• Advances understanding of the molecular mechanisms driving bone diseases.
• Provides a foundation for future research into targeted therapies for sclerosing bone disorders.
• Emphasizes the complexity of bone mass regulation and the involvement of specific signaling pathways.