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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
Regulation of Runx2 by Histone Deacetylases in Bone.
Osteogenesis involves a cascade of processes wherein mesenchymal stem cells differentiate towards osteoblasts, strictly controlled by a number of regulatory factors. Runx2 protein is a key transcription factor which serves as a master regulator for osteogenesis by activating the promoters of various osteoblastic genes. Runx2 is regulated by several cofactors, including the histone deacetylase enzymes known as HDACs. HDACs are a family of proteins that regulate gene expression and/or activity through the mechanism of deacetylation and they can be divided into four classes, namely classes I, II, III and IV HDACs based on their sequence identity and nuclear or cytoplasmic localization. Knockout studies of all classes of HDACs showed their specific developmental roles. Evidence has proved Runx2 to be a repressible target of HDACs and this interplay is found to be a crucial factor controlling osteoblast differentiation. Further, another level of osteogenic regulation involves microRNAs (miRNAs), which are small, non-coding endogenous molecules capable of gene silencing by partial or complete complementary binding of their seed sequences to the 3' untranslated region (UTR) of target mRNAs. In this study, the recent developments on identifying the function of HDACs on Runx2 expression/activity and the impact of miRNAs on HDACs in regulation of osteogenesis are reviewed.
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