Histological and molecular characterization of bone integrity in osteogenesis imperfecta: a case series across genetic subtypes
Abstract
Osteogenesis imperfecta (OI) is a genetically heterogeneous skeletal disorder characterized by bone fragility and variable clinical severity. However, how molecular defects translate into alterations of bone microstructure and composition across OI subtypes remains incompletely understood. In this case series, we systematically evaluated cortical bone integrity in patients with OI types 1, 3, 4, 6, 8, and 14 using histological and molecular approaches, including Raman spectroscopy, and compared findings with non-OI controls. Histological analyses revealed case-specific disruption of bone architecture across OI cases, where the severity of bone disorganization increased progressively from OI type 1 to types 3, 6, 8, and 14. In addition osteocyte lacunar area (Ot.Lc.Ar) was increased specifically in OI subtypes 1, 6, 8, and 14 bones, while osteocyte lacunar appearance was heterogeneous in size, shape, alignment, and spatial distribution in OI types 3, 6, 8, and 14, underscoring the case-specific alterations. Consistently, polarized light microscopy demonstrated increased green birefringence under polarized light microscopy in OI types 1 and 14 and reduced lamellar thickness in OI types 1, 6, and 8. At the molecular level, Raman spectroscopic analyses showed reduced mineral and organic matrix signals in OI bone, specifically OI type 3, indicating compromised mineralization and altered bone matrix composition. Together, these findings illustrate the potential that OI bone…
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Evidence Hub reads this as a case series, done in people. Its evidence level is 5 of 5 (Very low · case / narrative / animal / in vitro / in silico). Case reports, narrative reviews, and animal, cell or computer-model studies give the weakest evidence for human health.
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