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Functional analysis of the Myostatin gene promoter in sheep

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Abstract

Compared with the understanding for the functional mechanism of the myostatin gene, little is known about the regulatory mechanism of the myostatin gene transcription and expression. To better understand the function of the myostatin gene promoter (MSTNpro) in the transcriptional regulation of the myostatin gene and to further investigate the transcriptional regulation mechanism of the myostatin gene, the promoter region of the myostatin gene in sheep has been cloned in our recent study (AY918121). In this study, the wild (W) type MSTNProW-EGFP vectors and E-box (E) (CANNTG) mutant (M) type MSTNProE(3+5+7)M-EGFP vectors were constructed and the transcriptional regulation activities were compared by detecting the fluorescent strength of EGFP (enhanced green fluorescent protein) in C2C12 myoblasts (or myotubes) and sheep fibroblasts transfected with the vectors. Results showed that the 0.3–1.2 kb sheep myostatin promoter could activate the transcription and expression of EGFP gene in C2C12 myoblasts to different extent and the 1.2 kb promoter was the strongest. However, fluorescence was not observed in the sheep fibroblasts transfected with the 1.2 kb sheep myostatin promoter. These results suggested that the specific nature of the myostatin gene expression in skeletal muscle was attributed to the specific nature of the myostatin promoter activity. The increasing growth density of C2C12 myoblasts inhibited the transcriptional regulation activity of the wild type sheep myostatin promoter by a mechanism of feedback. The transcriptional regulation activity of the 1.2 kb wild type sheep myostatin promoter increased significantly after C2C12 myoblasts were differentiated, while the activity of 1.2 kb E(3+5+7)-mutant type myostatin promoter had no obvious change. This result suggested that MyoD may be responsible for the difference of the myostatin gene transcription and expression between growing and differentiating conditions by binding to E-box of the myostatin promoter.

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Authors and Affiliations

  1. State Key Laboratory for Agrobiotechnology, College of Biological Science, China Agricultural University, Beijing, 100094, China

    Du Rong, An XiaoRong & Chen YongFu

  2. College of Animal Science and Technology, Shanxi Agricultural University, Taigu, 030801, China

    Du Rong

  3. College of Modern Education Technology, Shanxi Agricultural University, Taigu, 030801, China

    Qin Jian

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  1. Du Rong
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  2. An XiaoRong
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  3. Chen YongFu
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  4. Qin Jian
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Correspondence to An XiaoRong.

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Supported by the National Hi-Tech R&D Program (“863” Program) of China (Grant No. 2002AA206311)

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Du, R., An, X., Chen, Y. et al. Functional analysis of the Myostatin gene promoter in sheep. SCI CHINA SER C 50, 648–654 (2007). https://doi.org/10.1007/s11427-007-0085-2

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  • DOI: https://doi.org/10.1007/s11427-007-0085-2

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