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Unraveling the transcriptional regulatory machinery in chondrogenesis

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Abstract

Since the discovery of SOX9 mutations in the severe human skeletal malformation syndrome campomelic dysplasia in 1994, Sox9 was shown to be both required and sufficient for chondrocyte specification and differentiation. At the same time, its distant relatives Sox5 and Sox6 were shown to act in redundancy with each other to robustly enhance its functions. The Sox trio is currently best known for its ability to activate the genes for cartilage-specific extracellular matrix components. Sox9 and Sox5/6 homodimerize through domains adjacent to their Sry-related high-mobility-group DNA-binding domain to increase the efficiency of their cooperative binding to chondrocyte-specific enhancers. Sox9 possesses a potent transactivation domain and thereby recruits diverse transcriptional co-activators, histone-modifying enzymes, subunits of the mediator complex, and components of the general transcriptional machinery, such as CBP/p300, Med12, Med25, and Wwp2. This information helps us begin to unravel the mechanisms responsible for Sox9-mediated transcription. We review here the discovery of this master chondrogenic trio and its roles in chondrogenesis in vivo and at the molecular level, and we discuss how these pioneering studies open the way for many additional studies that are needed to further increase our understanding of the transcriptional regulatory machinery operating in chondrogenesis.

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Authors and Affiliations

  1. Department of Orthopaedics, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo, Kyoto, 606-8507, Japan

    Haruhiko Akiyama

  2. Department of Cell Biology, Rheumatologic and Orthopaedic Research Center, Cleveland Clinic Lerner Research Institute, 9500 Euclid Avenue, NC-10, Cleveland, OH 44195, USA

    Véronique Lefebvre

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  1. Haruhiko Akiyama
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  2. Véronique Lefebvre
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Correspondence to Haruhiko Akiyama.

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H. Akiyama is a recipient of the 2010 JSBMR Distinguished Scientist Award.

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Akiyama, H., Lefebvre, V. Unraveling the transcriptional regulatory machinery in chondrogenesis. J Bone Miner Metab 29, 390–395 (2011). https://doi.org/10.1007/s00774-011-0273-9

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