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Mutations in the Gene Encoding the RER Protein FKBP65 Cause Autosomal-Recessive Osteogenesis Imperfecta

2010    Alanay, Yasemin; Avaygan, Hrispima; Camacho, Natalia; Utine, G. Eda; Boduroglu, Koray; Aktas, Dilek; Alikasifoglu, Mehmet; Tuncbilek, Ergul; Orhan, Diclehan; Bakar, Filiz Tiker; Zabel, Bernard; Superti-Furga, Andrea; Bruckner-Tuderman, Leena; Curry, Cindy J. R.; Pyott, Shawna; Byers, Peter H.; Eyre, David R.; Baldridge, Dustin; Lee, Brendan; Merrill, Amy E.; Merrill, Amy E.

Osteogenesis imperfecta is a clinically and genetically heterogeneous brittle bone disorder that results from defects in the synthesis, structure, or posttranslational modification of type I procollagen. Dominant forms of OI result from mutations in COL1A1 or COL1A2, which encode the chains of the type I procollagen heterotrimer. The mildest form of OI typically results from diminished synthesis of structurally normal type 1 procollagen, whereas moderately severe to lethal forms of OI usually result from structural defects in one of the type 1 procollagen chains. Recessively inherited OI, usually phenotypically severe, has recently been shown to result from defects in the prolyl-3-hydroxylase complex that lead to the absence of a single 3-hydroxyproline at residue 986 of the alpha 1 (I) triple helical domain. We studied a cohort of five consanguineous Turkish families, originating from the Black Sea region of Turkey, with moderately severe recessively inherited OI and identified a novel locus for OI on chromosome 17. In these families, and in a Mexican-American family, homozygosity for mutations in FKBP10, which encodes FKBP65, a chaperone that participates in type 1 procollagen folding, was identified. Further, we determined that FKBP10 mutations affect type I procollagen secretion. These findings identify a previously unrecognized mechanism in the pathogenesis of OI.