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      Bioinformatic analysis of the ssc-miR-146b upstream promoter region

      Xin Tao;Xiaoming Men;Ziwei Xu;Institute of Animal Husbandry and Veterinary Science, Zhejiang Academy of Agricultural Sciences;  
      Sus Scrofa microRNA-146b-5p(ssc-miR-146b) was found to be one of differentially expressional microRNAs(miRNA) in our previous study. Not only it is highly expressed but also it maintains the largest up-regulated differences on the expressional level at different time points in the small intestinal mucosa of weaned piglets. To further explore the regulation mechanism of microRNA-146b-5 p(miR-146b)during the stressful progress in weaned piglets, the present study predicted the functions of the ssc-miR-146b upstream promoter region using biological analysis. The analytical results showed that ssc-miR-146b is an intergenic miRNA. The length of the promoter region of ssc-miR-146b was predicted to be2,249 bp using the Ensemble database. The length of the CpG island in the ssc-miR-146b promoter region was found to be 167 bp and it was located from 464 to 630 bp. Twenty six binding sites of 9 transcription factors in the upstream promoter region, including the sites of genes such as Spl, AP-1, MyoD, GATA etc,were discovered using different kinds of analytical software. The predictions of the CpG island and transcription factor binding sites provided significant information for further studying the transcriptional regulation mechanism of ssc-miR-146b on the small intestinal injury due to weaning stress.
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