ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2017, Vol. 48 ›› Issue (9): 1635-1647.doi: 10.11843/j.issn.0366-6964.2017.09.008

Previous Articles     Next Articles

Identify and Analyze the Expression Profile and Mechanism of Buffalo Mammary Gland miRNAs in the Lactation and Non-lactation Periods

CAI Xiao-yan1,2, BAO Zheng-pan1, GU Jing-kai1, DENG Kai1, ZHANG Xiao-xi1, REN Yan-ping1, SHEN Peng-lei1, SHI De-shun1*, LIU Qing-you1*   

  1. 1. State Key Laboratory of Subtropical Bioresource Conservation and Utilization, Guangxi University, Nanning 530004, China;
    2. Guangxi Institute of Animal Science, Nanning 530001, China
  • Received:2017-01-09 Online:2017-09-23 Published:2017-09-23

Abstract:

This study aimed to identify and analyze the expression patterns and mechanism of buffalo mammary gland miRNAs in the lactation and non-lactation periods. Buffalo mammary gland tissues in lactation and non-lactation periods were collected, their miRNAs expression profiles were analyzed by Solexa sequencing technology, pre-miRNAs, mature miRNAs and novel miRNAs were identified, respectively, the first preferred nucleotide and chromosome distribution were analyzed. The highly and differentially expressed miRNAs in the lactation and non-lactation periods were detected. The results showed that 2 miRNAs expression profiles from buffalo lactation and non-lactation mammary glands were constructed. 12 768 110 and 12 569 467 high-quality reads between 18 and 31 nt were obtained seperately. Three hundred fifty-nine mature miRNAs and 363 pre-miRNAs belonged to 259 miRNAs families, and 5 buffalo-specific miRNAs were confirmed by sequencing. U was the most common nucleotide at the 5'end of 19 and 25 nt miRNAs. The bbu-let-7b, bbu-let-7a, miR-26a and miR-21 showed high expression in both periods. bbu-miR-148a, 143, 200c, 200a and bbu-let-7f were specificially highly expressed in non-lactation period, the bbu-miR-125b, 29a and bbu-let-7c were specifically highly expressed in lactation period. The bbu-miR-148a, 143, 200a, 141 and 30a-5p decreased the expression in the lactation period to less than 1/2 of the non-lactation period, bbu-miR-26a, 29a, 125b, 99a and bbu-let-7c were highly expressed in the lactation period more than or equal to 2 times of the lactation period. The result indicate that 2 miRNAs profiles from buffalo lactation and non-lactation mammary gland tissues were constructed. 359 mature miRNAs and 363 pre-miRNAs belonging to 259 buffalo miRNAs families were identified. 5 buffalo genome-specific miRNAs and 10 highly differentially expressed miRNAs were obtained, which lay the foundation for further elucidating the mechanism of key miRNAs in lactating buffalo.

CLC Number: