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Caprine sex affects skeletal muscle profile and MRFs expression during postnatal development

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Abstract

The important roles of myogenic regulatory factors (MRFs) have been well addressed in the process of mammalian skeletal myogenesis, while limited research has been performed in small ruminants. Furthermore, the effects of gender on the development of skeletal muscle and MRFs expression remain unknown. In this study, we identified the caprine Myf5, Myf6, MyoD and myogenin genes and quantified their expressions at six different postnatal time points by real‐time RT‐PCR. The sex has a marked effect on the expression differences of Myf5, MyoD and myogenin in the five investigated skeletal muscles, while minor influence on the expression difference of Myf6 except for Semitendinosus and Quadriceps femoris tissues (P < 0.001). The histological sections of muscles revealed a constant increase of muscle fiber diameter with aging but non‐significant differences between genders. We provide novel evidence for MRFs expression in age‐ and gender‐dependent manners, which will contribute to prioritizing these genes as potential candidate genes for trait‐associated study and provide a foundation for understanding the molecular control of skeletal muscle growth in goat species.
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Document Type: Rapid Communication

Publication date: May 1, 2013

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