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Related Experiment Videos

Mutation analysis of coding sequences for type I procollagen in individuals with low bone density

L D Spotila1, A Colige, L Sereda

  • 1Department of Biochemistry and Molecular Biology, Jefferson Medical College, Philadelphia, Pennsylvania.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|June 1, 1994
PubMed
Summary

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Mutations in COL1A1 and COL1A2 genes were investigated in patients with low bone density. Two novel mutations were identified, suggesting further research into these genes for osteopenia is warranted.

Area of Science:

  • Genetics and Molecular Biology
  • Bone Biology and Disease

Background:

  • Osteogenesis imperfecta (OI) is primarily caused by mutations in type I procollagen genes (COL1A1 and COL1A2).
  • Low bone density, including osteopenia and osteoporosis, often has a genetic component, but causative mutations are not always apparent.

Purpose of the Study:

  • To investigate whether patients with low bone density, without overt OI, harbor mutations in the COL1A1 and COL1A2 genes.
  • To identify novel mutations and understand their potential role in the pathogenesis of osteopenia.

Main Methods:

  • Genetic analysis of 26 patients with low bone density and a family history of osteopenia/osteoporosis.
  • Polymerase chain reaction (PCR) amplification of cDNA from fibroblast mRNA targeting COL1A1 and COL1A2 coding regions.
  • Direct sequencing of PCR products to identify mutations and polymorphisms.

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Main Results:

  • Three out of 26 patients exhibited mutations affecting the encoded amino acid in type I procollagen genes.
  • Two patients, unrelated, possessed a novel mutation altering proline codon alpha 1(I)-27 to alanine in COL1A1.
  • A polymorphism in COL1A2 codon alpha 2(I)-459 was observed with equal frequency in patients and controls; all patients expressed both COL1A1 and COL1A2 alleles.

Conclusions:

  • Mutations in COL1A1 and COL1A2 may contribute to low bone density in individuals not meeting OI criteria.
  • The identified novel mutation's functional impact and role in osteopenia require further investigation.
  • Larger cohort studies are recommended to uncover additional COL1A1 or COL1A2 mutations in selected osteopenic populations.