PPIB Mutations Cause Severe Osteogenesis Imperfecta

Deficiency of cartilage-associated protein (CRTAP) or prolyl 3-hydroxylase 1(P3H1) has been reported in autosomal-recessive lethal or severe osteogenesis imperfecta (OI). CRTAP, P3H1, and cyclophilin B (CyPB) form an intracellular collagen-modifying complex that 3-hydroxylates proline at position 98...

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Published in:	American journal of human genetics Vol. 85; no. 4; pp. 521 - 527
Main Authors:	van Dijk, Fleur S., Nesbitt, Isabel M., Zwikstra, Eline H., Nikkels, Peter G.J., Piersma, Sander R., Fratantoni, Silvina A., Jimenez, Connie R., Huizer, Margriet, Morsman, Alice C., Cobben, Jan M., van Roij, Mirjam H.H., Elting, Mariet W., Verbeke, Jonathan I.M.L., Wijnaendts, Liliane C.D., Shaw, Nick J., Högler, Wolfgang, McKeown, Carole, Sistermans, Erik A., Dalton, Ann, Meijers-Heijboer, Hanne, Pals, Gerard
Format:	Journal Article
Language:	English
Published:	Cambridge, MA Elsevier Inc 09-10-2009 Cell Press Elsevier
Subjects:	Biological and medical sciences Catalysis Collagen - chemistry Comparative analysis Cyclophilins - genetics Cyclophilins - metabolism Cyclophilins - physiology Diseases of the osteoarticular system DNA Mutational Analysis Family Health Female Fibroblasts - metabolism Fundamental and applied biological sciences. Psychology General aspects. Genetic counseling Genes Genetics of eukaryotes. Biological and molecular evolution Genotype & phenotype Humans Malformations and congenital and or hereditary diseases involving bones. Joint deformations Medical genetics Medical sciences Molecular and cellular biology Mutation Osteogenesis Imperfecta - genetics Pregnancy Procollagen-Proline Dioxygenase - metabolism Proline - chemistry Protein Structure, Tertiary Proteins Human Diseases of the osteoarticular system Osteogenesis imperfecta Genetics Mutation Severe Osteochondrodysplasia Genetic disease
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Summary:	Deficiency of cartilage-associated protein (CRTAP) or prolyl 3-hydroxylase 1(P3H1) has been reported in autosomal-recessive lethal or severe osteogenesis imperfecta (OI). CRTAP, P3H1, and cyclophilin B (CyPB) form an intracellular collagen-modifying complex that 3-hydroxylates proline at position 986 (P986) in the α1 chains of collagen type I. This 3-prolyl hydroxylation is decreased in patients with CRTAP and P3H1 deficiency. It was suspected that mutations in the PPIB gene encoding CyPB would also cause OI with decreased collagen 3-prolyl hydroxylation. To our knowledge we present the first two families with recessive OI caused by PPIB gene mutations. The clinical phenotype is compatible with OI Sillence type II-B/III as seen with COL1A1/2, CRTAP, and LEPRE1 mutations. The percentage of 3-hydroxylated P986 residues in patients with PPIB mutations is decreased in comparison to normal, but it is higher than in patients with CRTAP and LEPRE1 mutations. This result and the fact that CyPB is demonstrable independent of CRTAP and P3H1, along with reported decreased 3-prolyl hydroxylation due to deficiency of CRTAP lacking the catalytic hydroxylation domain and the known function of CyPB as a cis-trans isomerase, suggest that recessive OI is caused by a dysfunctional P3H1/CRTAP/CyPB complex rather than by the lack of 3-prolyl hydroxylation of a single proline residue in the α1 chains of collagen type I.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Case Study-2 ObjectType-Feature-4 ObjectType-Report-1 ObjectType-Article-3
ISSN:	0002-9297 1537-6605
DOI:	10.1016/j.ajhg.2009.09.001