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XB-ART-39599
Dev Biol April 15, 2009; 328 (2): 392-402.

The Xenopus MEF2 gene family: evidence of a role for XMEF2C in larval tendon development.

della Gaspera B , Armand AS , Sequeira I , Lecolle S , Gallien CL , Charbonnier F , Chanoine C .


Abstract
MEF2 transcription factors are well-established regulators of muscle development. In this report, we describe the cloning of multiple splicing isoforms of the XMEF2A and XMEF2C encoding genes, differentially expressed during Xenopus development. Using whole-mount in situ hybridization, we found that the accumulation of XMEF2C mRNA in the tadpole stages was restricted to intersomitic regions and to the peripheral edges of hypaxial and cranial muscle masses in contrast to XMEF2A and XMEF2D, characterized by a continuous muscle cell expression. The XMEF2C positive cells express the bHLH transcription factor, Xscleraxis, known as a specific marker for tendons. Gain of function experiments revealed that the use of a hormone-inducible XMEF2C construct is able to induce Xscleraxis expression. Furthermore, XMEF2C specifically cooperates with Xscleraxis to induce tenascin C and betaig-h3, two genes preferentially expressed in Xenopus larval tendons. These findings 1) highlight a previously unappreciated and specific role for XMEF2C in tendon development and 2) identify a novel gene transactivation pathway where MEF2C cooperates with the bHLH protein, Xscleraxis, to activate specific gene expression.

PubMed ID: 19389348
Article link: Dev Biol

Genes referenced: col12a1 col1a2 col5a1 mef2a mef2c mef2d myf6 myh4 myod1 pax3 scx tgfbi tnc tnmd


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