Characterization of microRNA expression in goat muscle was studied, with the purposes of providing basic information for further studies of goat growth and development activities such as goat muscle cell proliferation and differentiation. The small RNAs isolated from total RNA of goat muscle were sequenced by Solexa and then bioinformatics analysis was perfomed. Meanwhile, the expression of selected miRNA was validated by q-PCR. Based on Solexa sequencing and bioinformatics analysis, 517 muscle miRNAs, which are conservative on evolution of mammals (sheep, bovine, swine, horse, dog), and 2 goat genome-specific miRNA were identified. Among them, 306 exceeded 100 in the expression levels. The expression of 8 selected miRNA in muscle tissues obtained by q-PCR was agreement with Solexa sequencing results. MiRNA target gene prediction and functional analysis showed that many miRNAs among them may affect cell signaling pathways and animal muscle development. Succeed in construction of expression profiling of miRNA which are abundant and differentially expressed in goat muscle tissues. This study provides important information on the role of miRNA regulation in muscle growth and development.%本研究旨在挖掘山羊肌肉组织miRNA,获取山羊肌肉组织miRNA表达谱并分析其生物学特征,为进一步研究特定miRNA参与山羊肌肉细胞的增殖与分化等生长发育机制奠定理论基础.从山羊肌肉组织中提取总RNA,分离、构建小片段RNA文库,利用Solexa方法进行测序并进行生物信息学分析,最后利用q-PCR技术验证miRNA在山羊肌肉组织中的表达情况.共鉴定出517个物种间保守的和2个山羊基因组特有的miRNA.其中306个表达量在100以上.随机选择8个miRNA,利用q-PCR验证其在山羊肌肉组织中的表达情况,结果与测序结果一致.同时miRNA靶基因预测和功能分析表明,很多miRNA可能影响一些与动物肌肉发育相关的细胞信号通路.测序成功获取了山羊肌肉组织miRNA序列及其表达谱,山羊肌肉组织miRNA表达丰富且表达量各异.本研究也为进一步研究miRNA调控哺乳动物肌肉发育奠定了理论基础.
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