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MicroRNA-203a regulates fast muscle differentiation by targeting dmrt2a in zebrafish embryos.

Gene. 2017 Aug 20;625:49-54. Epub 2017 May 05
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摘要


Dmrt2b (doublesex and mab-3 related transcription factor 2b) has been revealed to be involved in zebrafish slow muscle development. However, the function of dmrt2a, a paralogue gene of dmrt2b, remains unclear during zebrafish muscle development. Here, we demonstrated that knockdown of dmrt2a resulted in severe developmental defects, and caused downregulation of fast muscle marker myhz-2 and upregulation of slow muscle marker myhz-5, respectively. It is known that microRNAs (miRNAs) control many biological events including muscle development. Dmrt2a was predicted to be a target gene of miR-203, which was further verified by luciferase reporter assay, since miR-203a was found to directly reduce the expression of dmrt2a by binding to the seed sequence of its 3'UTR. After miR-203a injection into zebrafish embryos, the expression of dmrt2a was significantly inhibited. Similar to the effect of dmrt2a knockdown, miR-203a overexpression led to downregulation of myhz-2 and upregulation of myhz-5. Our studies indicated that miR-203a directly regulated dmrt2a expression to control fast and slow muscle differentiation, while overexpression of miR-203a or knockdown of dmrt2a will impair fast muscle development and promote slow muscle development.

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