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Mendelian bone fragility disorders.

Marie-Eve Robinson1, Frank Rauch1

  • 1Shriners Hospital for Children, Montreal, Quebec, Canada.

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Summary
This summary is machine-generated.

Genetic variants cause Mendelian bone fragility disorders. Some variants in collagen genes (COL1A1/COL1A2) may present as osteoporosis, blurring the lines between osteogenesis imperfecta and primary osteoporosis.

Keywords:
Collagen type IFracturesOsteoblastOsteogenesis imperfectaSequencing

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Area of Science:

  • Genetics
  • Orthopedics
  • Molecular Biology

Background:

  • Mendelian bone fragility disorders result from genetic variants affecting bone strength, with earlier fractures linked to more severe defects.
  • Osteogenesis imperfecta (OI) is the most recognized disorder, typically caused by dominant variants in COL1A1 or COL1A2, genes encoding collagen type I.
  • Rare, severe fragility can also stem from biallelic mutations in LRP5 and WNT1.

Purpose of the Study:

  • To review Mendelian bone fragility disorders, focusing on osteogenesis imperfecta and its genetic underpinnings.
  • To explore the overlap between osteogenesis imperfecta and primary osteoporosis due to genetic factors.
  • To discuss the implications of emerging genetic sequencing data on diagnosing bone fragility disorders.

Main Methods:

  • Literature review of Mendelian bone fragility disorders.
  • Analysis of genetic databases and sequencing studies.
  • Clinical phenotype correlation with genetic variants.

Main Results:

  • A significant number of carriers of COL1A1/COL1A2 variants, potentially causing OI, are undiagnosed or misdiagnosed as adult osteoporosis.
  • Heterozygous pathogenic variants in LRP5 and WNT1 are common and can manifest as primary osteoporosis.
  • Emerging evidence suggests that some cases of primary osteoporosis may be due to mutations in genes typically associated with OI.

Conclusions:

  • The distinction between osteogenesis imperfecta and primary osteoporosis is becoming less clear due to genetic factors.
  • Genetic testing is crucial for accurate diagnosis and understanding the spectrum of bone fragility disorders.
  • Further research is needed to fully elucidate the genetic basis and clinical implications of these overlapping conditions.