Satellite cell is a kind of myogenic stem cells, which plays an important role in muscle development and injury repair. Through proliferation, differentiation and fusion of muscle fiber can satellite cells make new myonuclear, leading to the hypertrophy of skeletal muscle and fiber type transformation, and this would further affect the meat quality. Here, we review the relationship between muscle fiber development and meat quality attributes as well as the influence of the satellite cell differentiation on muscle fiber character. Besides, we also summarize the classical signaling pathway (i.e., Notch etc.) and influence of epigenetic regulation (i.e. miRNA) on muscle quality.
Growth differentiation factor 9 (GDF9) secreted by oocyte is essential for follicular growth and differentiation. This review introduced the structure, function and regulation of GDF9, as well as the cloning and structure, developmental expression, mapping and polymorphism of GDF9 gene. The relationship between GDF9 gene and reproductive performance was also discussed in mammals.
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