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    The osteocalcin gene: a model for multiple parameters of skeletal-specific transcriptional control

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    Authors
    Stein, Gary S.
    Lian, Jane B.
    Van Wijnen, Andre J.
    Stein, Janet L.
    UMass Chan Affiliations
    Department of Cell Biology
    Graduate School of Biomedical Sciences
    Document Type
    Journal Article
    Publication Date
    1997-08-01
    Keywords
    Animals; Chromatin; Chromosome Mapping; *Gene Expression Regulation; Humans; Mice; Mice, Transgenic; Nuclear Matrix; Nucleosomes; Osteocalcin; Promoter Regions (Genetics); Rats; *Transcription, Genetic
    Life Sciences
    Medicine and Health Sciences
    
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    Link to Full Text
    https://doi.org/10.1023/A:1006803615430
    Abstract
    Influences of promoter regulatory elements that are responsive to basal and tissue-restricted transactivation factors, steroid hormones, growth factors and other physiologic mediators has provided the basis for understanding regulatory mechanisms contributing to developmental expression of osteocalcin, tissue specificity and biological activity (reviewed in [1-3]). These regulatory elements and cognate transcription factors support postproliferative transcriptional activation and steroid hormone (e.g. vitamin D) enhancement at the onset of extracellular matrix mineralization during osteoblast differentiation. Three parameters of nuclear structure contribute to osteocalcin gene transcriptional control. The linear representation of promoter elements provides competency for physiological responsiveness within the contexts of developmental as well as phenotype-dependent regulation. Chromatin structure and nucleosome organization reduce distances between independent regulatory elements providing a basis for integrating components of transcriptional control. The nuclear matrix supports gene expression by imposing physical constraints on chromatin related to three dimensional genomic organization. In addition, the nuclear matrix facilitates gene localization as well as the concentration and targeting of transcription factors. Several lines of evidence are presented which are consistent with involvement of multiple levels of nuclear architecture in tissue-specific gene expression during differentiation. Growth factor and steroid hormone responsive modifications in chromatin structure, nucleosome organization and the nuclear matrix are considered which influence transcription of the bone tissue-specific osteocalcin gene during progressive expression of the osteoblast phenotype.
    Source

    Mol Biol Rep. 1997 Aug;24(3):185-96.

    DOI
    10.1023/A:1006803615430
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/32609
    PubMed ID
    9291092
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    ae974a485f413a2113503eed53cd6c53
    10.1023/A:1006803615430
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