Project description:miRNAs have been implicated in the regulation of milk protein synthesis and development of mammary gland. However, the function of miRNAs in regulating lactation is unclear. Therefore, the elucidation of miRNA expression profiles in MG provides a crucial entry into the understanding of the mechanisms of lactation initiation. Our present work is to examine miRNA expression profiles in bovine mammary gland, and to evaluate miRNAs function through the identification of differentially expressed miRNA between lactation and non-lactation mammary gland. Identification of novel miRNAs highlights the important function of low abundance and less conserved miRNAs. An interaction network of known miRNAs and their target genes around the lactation function was constructed to postulate the functional roles of miRNAs in mammary gland. This integrated analysis provides important information that will inspire further experimental investigations into the field of miRNAs and their targets during lactation.
Project description:We investigated miRNA expression in Holstein dairy cow of mammary gland with different producing quality milk using high-throughput sequence and qRT-PCR techniques. miRNA libraries were constructed from mammary gland tissues taken from a high producing quality milk and a low producing quality milk Holstein dairy cow, the small RNA digitalization analysis based on HiSeq high-throughput sequencing takes the SBS-sequencing by synthesis.The libraries included 4732 miRNAs. A total of 124 miRNAs in the high producing quality milk mammary gland showed significant differences in expression compared to low producing quality milk mammary gland (P<0.05). Conclusion: Our study provides a broad view of the bovine mammary gland small RNA expression profile characteristics. Differences in types and expression levels of miRNAs were observed between high producing quality milk and a low producing quality milk Holstein dairy cow
Project description:In this study, two small RNA libraries were constructed using dry period and peak lactation dairy goat mammary gland tissues and sequenced by the Illumina Solexa high-throughput sequencing system. A total of 346 conserved and 95 novel miRNAs were identified in the dairy goat. The expression of miRNAs was confirmed by qRT-PCR in nine tissues and the mammary gland during development cycles. In addition, several candidate miRNAs that may be involved in mammary gland development and lactation were found by the comparison of miRNA expression profiles among different tissue and developmental stages of the mammary gland. This study provides the identification and profile of miRNAs related to the biology of the mammary gland in the dairy goat. The identification of these miRNAs could contribute to understanding the molecular mechanisms of lactation physiology and the development of the mammary gland in the dairy goat.
Project description:miRNAs have been implicated in the regulation of milk protein synthesis and development of mammary gland. However, the function of miRNAs in regulating lactation is unclear. Therefore, the elucidation of miRNA expression profiles in MG provides a crucial entry into the understanding of the mechanisms of lactation initiation. Our present work is to examine miRNA expression profiles in bovine mammary gland, and to evaluate miRNAs function through the identification of differentially expressed miRNA between lactation and non-lactation mammary gland. Identification of novel miRNAs highlights the important function of low abundance and less conserved miRNAs. An interaction network of known miRNAs and their target genes around the lactation function was constructed to postulate the functional roles of miRNAs in mammary gland. This integrated analysis provides important information that will inspire further experimental investigations into the field of miRNAs and their targets during lactation. Examination of 2 different miRNA expression profilings in bovine mammary gland
Project description:Previoulsly miRNA expression profiling of the whole mammary gland across different stages of pregnancy and lactation has been performed in mice. Since mammary gland has both epithelial and stromal compartments, to specifically identify the miRNAs involved in the transition from pregnancy to lactation a process termed as secretory activation, expression profiling of isolated mammary epithelial cells (MECs) from four CD1 mice each at Pregnancy day 14 (P14) and Lactation day 2 (L2) was performed in the current study. Statistical analysis of the miRNA changes between P14 and L2 identified 32 miRNAs to be differentially expressed with a fold change greater than or equal to 2, of which, the majority of them declinied at the onset of lactation.