ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (9): 1908-1918.doi: 10.11843/j.issn.0366-6964.2018.09.012

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Effects of Conjugated Linoleic Acid Supplementation in Diet on the Expression Profile of miRNAs in Porcine Muscle Tissue

WANG Qi1,2, QI Ren-li1,2, LIU Hong1, WANG Jing1,2, HUANG Jin-xiu1,2*   

  1. 1. Chongqing Academy of Animal Sciences, Chongqing 402460, China;
    2. Key Laboratory of Pig Industry Sciences of Ministry of Agriculture, Chongqing 402460, China
  • Received:2017-12-28 Online:2018-09-23 Published:2018-09-26

Abstract:

This study was conducted to investigate the molecular mechanisms of muscle metabolism regulated by conjugated linoleic acid (CLA) through affecting the expression of miRNA in porcine muscle. Twelve purebred Rongchang gilts with similar body weight were randomly divided into control and CLA groups. The pregnant gilts in CLA group were fed with 1.5% CLA diet from the beginning of pregnancy to weaning at 28 days old; After weaning, 30 piglets were respectively selected from the control and CLA groups, and the diet of piglets in original CLA group was also added 1.5% CLA. When the body weight of piglets was about 30 kg, 6 piglets from each group were slaughtered to collect the back muscle and leg muscle samples. After RNA extraction, cDNA libraries were constructed by the back muscle and leg muscle samples of the control and CLA groups; The Solexa deep sequencing was performed to analyze the effect of CLA on the miRNA expression profiles in porcine muscle tissue, the target genes prediction and function analysis for differentially expressed miRNA were carried out through the bioinformatics method. The results showed that:1)There were 44 869 982 and 45 105 806 clean reads in the back muscle and leg muscle tissues, respectively, and most of the small RNA sequence were 20-23 nt. 2) 306 and 304 known miRNAs were respectively found in the back muscle and leg muscle tissues, 295 known miRNAs were co-expressed in two tissues. 3) The expression of miRNA in porcine muscle was changed by CLA supplementation and the effect of CLA on miRNA expression in leg muscle was stronger than that in back muscle; 5 miRNAs in the back muscle and 12 miRNAs in the leg muscle were differentially expressed in corresponding CLA treatment (P<0.05), of which only the ssc-miR-224 was differentially expressed in both two tissues, thus 16 differentially expressed miRNAs were identified. 4) KEGG analysis revealed that the target genes of 16 differentially expressed miRNAs were involved in 292 biological pathways, of which 24 pathways were significantly enriched (P<0.05), including the MAPK and Notch signaling pathways, which were known to regulate muscle metabolism. 5) Six differentially expressed miRNAs were randomly selected to validate the sequencing results by qRT-PCR, the qRT-PCR expression results corresponded well with the results from the sequencing. This study suggests that CLA may regulate muscle metabolic pathways by affecting the expression of miRNA.

Key words: CLA, pig, miRNA, Solexa sequencing, muscle tissue

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