Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 22, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/ijms221910281
Keywords
congenital metabolic bone disorders; skeletal development; bone turnover; mineral metabolism; bone mineralization; bone fragility; pathological fractures
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Bone fragility is a pathological condition that results from altered mineralized bone mass homeostasis and deterioration of bone tissue microarchitecture, leading to reduced bone strength and increased fracture risk. It can manifest at any age within the spectrum of rare congenital bone metabolic diseases. Over 100 Mendelian-inherited metabolic bone disorders have been identified, affecting genes involved in bone and mineral metabolism regulation.
Bone fragility is a pathological condition caused by altered homeostasis of the mineralized bone mass with deterioration of the microarchitecture of the bone tissue, which results in a reduction of bone strength and an increased risk of fracture, even in the absence of high-impact trauma. The most common cause of bone fragility is primary osteoporosis in the elderly. However, bone fragility can manifest at any age, within the context of a wide spectrum of congenital rare bone metabolic diseases in which the inherited genetic defect alters correct bone modeling and remodeling at different points and aspects of bone synthesis and/or bone resorption, leading to defective bone tissue highly prone to long bone bowing, stress fractures and pseudofractures, and/or fragility fractures. To date, over 100 different Mendelian-inherited metabolic bone disorders have been identified and included in the OMIM database, associated with germinal heterozygote, compound heterozygote, or homozygote mutations, affecting over 80 different genes involved in the regulation of bone and mineral metabolism. This manuscript reviews clinical bone phenotypes, and the associated bone fragility in rare congenital metabolic bone disorders, following a disease taxonomic classification based on deranged bone metabolic activity.
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