Abstract
As one member of winged helix domain transcription factors, FoxD5 was reported to be a trunk organizer. Recent study showed that zebrafish foxd5 is expressed in the somites. To further understand the function of FoxD5 in fish muscle development, the FoxD5 gene was isolated from flounder. Its expression pattern was analyzed by in situ hybridization, while its function in regulating myogenic regulatory factor, MyoD, was analyzed by ectopic expression. It showed that flounder FoxD5 was firstly expressed in the tailbud, adaxial cells, and neural plate of the head. In flounder embryo, FoxD5 is expressed not only in forebrain but also in somite cells that will form muscle in the future. When flounder FoxD5 was over-expressed in zebrafish by microinjection, the expression of zebrafish MyoD in the somites was reduced, suggesting that FoxD5 is involved in myogenesis by regulating the expression of MyoD.
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