Lin Cheng-Yung, Yung Rong-Feng, Lee Hung-Chieh, Chen Wei-Ta, Chen Yau-Hung, Tsai Huai-Jen
Institute of Molecular and Cellular Biology, National Taiwan University, Room 307, Fisheries Science Building, No. 1, Section 4, Roosevelt Road, Taipei 106, Taiwan.
Dev Biol. 2006 Nov 15;299(2):594-608. doi: 10.1016/j.ydbio.2006.08.042. Epub 2006 Aug 24.
The functions of Myf5 and Myod are well known in trunk myogenesis. However, the roles that Myf5 and Myod play during craniofacial myogenesis are far from well known. We observed that zebrafish myf5 was detected in the primordia of the obliques, lateral rectus, sternohyoideus, and pharyngeal mesoderm cores. In contrast, myod transcripts were expressed in all head muscle precursors at later stages. Knockdown of myf5 revealed that Myf5 was required for the development of the obliques, lateral rectus, sternohyoideus, and all pharyngeal muscles, whereas knockdown of myod proved that Myod was required for the development of superior rectus, medial rectus, inferior rectus, lateral rectus, and the ventral pharyngeal muscles. myod mRNA did not rescue the loss of the cranial muscle caused by injecting myf5-morpholino, or vice versa, suggesting that the functions of Myf5 and Myod were not redundant in head paraxial mesoderm, a finding different from their functions in trunk myogenesis. Myf5, but not Myod, was required for the forward migration of myf5-positive oblique precursors. All evidences reveal that Myf5 and Myod function independently during cranial myogenesis. On the basis of the expression patterns of myf5 and myod, we propose a model to present how Myf5 and Myod are involved in head myogenesis of zebrafish.
Myf5和Myod在躯干肌生成中的功能已为人熟知。然而,Myf5和Myod在颅面肌生成过程中所起的作用却远未明确。我们观察到,斑马鱼myf5在斜肌、外直肌、胸骨舌骨肌和咽中胚层核心的原基中被检测到。相比之下,myod转录本在后期的所有头部肌肉前体细胞中表达。敲低myf5表明,Myf5是斜肌、外直肌、胸骨舌骨肌和所有咽肌发育所必需的,而敲低myod则证明,Myod是上直肌、内直肌、下直肌、外直肌和腹侧咽肌发育所必需的。myod mRNA不能挽救因注射myf5吗啉代寡核苷酸而导致的颅面肌肉缺失,反之亦然,这表明Myf5和Myod在头部轴旁中胚层中的功能并非冗余,这一发现与它们在躯干肌生成中的功能不同。Myf5阳性的斜肌前体细胞向前迁移需要Myf5,而不是Myod。所有证据表明,Myf5和Myod在颅面肌生成过程中独立发挥作用。基于myf5和myod的表达模式,我们提出了一个模型来展示Myf5和Myod如何参与斑马鱼的头部肌生成。
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