Prolyl 3-hydroxylase 1 null mice display abnormalities in fibrillar collagen-rich tissues such as tendons, skin, and bones

Janice A. Vranka, Elena Pokidysheva, Lauren Hayashi, Keith Zientek, Kazunori Mizuno, Yoshihiro Ishikawa, Kerry Maddox, Sara Tufa, Douglas R. Keene, Robert Klein, Hans Peter Bächinger

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70 Scopus citations


Osteogenesis imperfecta (OI) is a skeletal disorder primarily caused by mutations in the type I collagen genes. However, recent investigations have revealed that mutations in the genes encoding for cartilage-associated protein (CRTAP) or prolyl 3-hydroxylase 1 (P3H1) can cause a severe, recessive form of OI. These reports show minimal 3-hydroxylation of key proline residues in type I collagen as a result of CRTAP or P3H1 deficiency and demonstrate the importance of P3H1 and CRTAP to bone structure and development. P3H1 and CRTAP have previously been shown to form a stable complex with cyclophilin B, and P3H1 was shown to catalyze the 3-hydroxylation of specific proline residues in procollagen I in vitro. Here we describe a mouse model in which the P3H1 gene has been inactivated. Our data demonstrate abnormalities in collagen fibril ultrastructure in tendons from P3H1 null mice by electron microscopy. Differences are also seen in skin architecture, as well as in developing limbs by histology. Additionally bone mass and strength were significantly lower in the P3H1 mice as compared with wild-type littermates. Altogether these investigations demonstrate disturbances of collagen fiber architecture in tissues rich in fibrillar collagen, including bone, tendon, and skin. This model system presents a good opportunity to study the underlying mechanisms of recessive OI and to better understand its effects in humans.

Original languageEnglish (US)
Pages (from-to)17253-17262
Number of pages10
JournalJournal of Biological Chemistry
Issue number22
StatePublished - May 28 2010

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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