In close concert with projects 1 and 2, we seek common molecular features of abnormal bone collagen expression in fissue from mice and human cases of osteogenesis imperfecta (01) caused by mutations in genes encoding the CRTAP/P3H1/CYPB and FKBP10/HSP47 complexes and newly identified genes causing recessive 01. The significance and inter-relationships of defective prolyl 3-hydroxylation, associated post-translafional overmodification of lysine residues and abnormal cross-linking are the focus and basis of hypothesis-driven studies. One goal is to thoroughly test the possibility that abnormal post-translafional chemistry, and in particular cross-linking, underiies the britfie bone phenotype. Though the focus is novel recessive forms of 01, the significance of the findings is likely to extend across all forms of 01.
The specific aims are directed at establishing the cross-linking phenotype of bone collagen from mouse models and available human 01 cases, seeking a common pathology and common underiying mechanism.
This work will help to identify the biochemical changes in the collagen of all forms of britfie bone diseases. In so doing, it may lead to improved diagnosis and treatment of these disorders.
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|Hudson, David M; Weis, MaryAnn; Rai, Jyoti et al. (2017) P3h3-null and Sc65-null Mice Phenocopy the Collagen Lysine Under-hydroxylation and Cross-linking Abnormality of Ehlers-Danlos Syndrome Type VIA. J Biol Chem 292:3877-3887|
|Machol, Keren; Jain, Mahim; Almannai, Mohammed et al. (2017) Corner fracture type spondylometaphyseal dysplasia: Overlap with type II collagenopathies. Am J Med Genet A 173:733-739|
|Lee, Chae Syng; Fu, He; Baratang, Nissan et al. (2017) Mutations in Fibronectin Cause a Subtype of Spondylometaphyseal Dysplasia with ""Corner Fractures"". Am J Hum Genet 101:815-823|
|Abbott, Megan; Jain, Mahim; Pferdehirt, Rachel et al. (2017) Neonatal fractures as a presenting feature of LMOD3-associated congenital myopathy. Am J Med Genet A 173:2789-2794|
|Marom, Ronit; Jain, Mahim; Burrage, Lindsay C et al. (2017) Heterozygous variants in ACTL6A, encoding a component of the BAF complex, are associated with intellectual disability. Hum Mutat 38:1365-1371|
|Zeng, Huan-Chang; Bae, Yangjin; Dawson, Brian C et al. (2017) MicroRNA miR-23a cluster promotes osteocyte differentiation by regulating TGF-? signalling in osteoblasts. Nat Commun 8:15000|
|Joeng, Kyu Sang; Lee, Yi-Chien; Lim, Joohyun et al. (2017) Osteocyte-specific WNT1 regulates osteoblast function during bone homeostasis. J Clin Invest 127:2678-2688|
|Lim, Joohyun; Grafe, Ingo; Alexander, Stefanie et al. (2017) Genetic causes and mechanisms of Osteogenesis Imperfecta. Bone 102:40-49|
|Madan, Simran; Liu, Wei; Lu, James T et al. (2017) A non-mosaic PORCN mutation in a male with severe congenital anomalies overlapping focal dermal hypoplasia. Mol Genet Metab Rep 12:57-61|
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