Abstract
The domestic pig is an important agricultural animal used as a source of meat worldwide. As an important resource, Laiwu pig has some special characteristics compared with Yorkshire pig. It is necessary to identify the differentially expressed microRNAs (miRNAs) in skeletal muscle between two pig breeds. Therefore, we herein performed a comprehensive investigation for miRNA transcriptome of skeletal muscle from the two pig breeds. On average, we obtained approximately 13,493,607 clean reads in Laiwu pig and 12,938,257 clean reads in Yorkshire pig in this study. Totally, 265 known miRNAs were identified, and among these, 229 miRNAs were expressed in all the six pigs. From the 265 known miRNAs, 19 of these miRNAs were found significantly differentially expressed (q < 0.05). Of these significantly expressed miRNAs, seven miRNAs were significantly up-regulated and 12 miRNAs were down-regulated in Laiwu pig compared with Yorkshire pig. Among the significantly expressed miRNAs, ssc-miR-194-5p has the largest fold-change (6.35-fold). Ten differentially expressed miRNAs selected from high throughput sequencing were confirmed by real-time RT-PCR (RT-qPCR), and the results indicated that the expression patterns were consistent with sequencing results. Our results not only present a comprehensive miRNA transcriptome profile of skeletal muscle between two pig breeds with distinct phenotypes, but also could be useful for investigating the functions of differentially expressed miRNAs associated with the phenotype traits.
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Acknowledgements
This study was supported by the National Animal Breed Resource Preservation Project of China (2130135), the National Project for Breeding Transgenic Pigs of China (2013ZX08006-002), Shandong Province Modern Pig Technology and Industry System Project (SDAIT-08-02) and Shandong Province Agricultural Animal Breeding Project of China (2013LZ02-015, 2014LZ03-016).
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Wei Chen declares that he has no conflict of interest. Guo-Feng Fang declares that he has no conflict of interest. Shou-Dong Wang declares that he has no conflict of interest. Hui Wang declares that she has no conflict of interest. Yong-Qing Zeng declares that he has no conflict of interest.
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This work was approved by Institutional Animal Care and Use Ethics Committee of Shandong Agricultural University and carried out in accordance with the ‘‘Guidelines for Experimental Animals’’ of the Ministry of Science and Technology (Beijing, PR China).
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Chen, W., Fang, GF., Wang, SD. et al. Characterization and differential expression of microRNA in skeletal muscle of Laiwu and Yorkshire pig breeds. Genes Genom 39, 173–182 (2017). https://doi.org/10.1007/s13258-016-0484-5
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DOI: https://doi.org/10.1007/s13258-016-0484-5