畜牧兽医学报 ›› 2016, Vol. 47 ›› Issue (10): 1969-1976.doi: 10.11843/j.issn.0366-6964.2016.10.004

• 遗传繁育 • 上一篇    下一篇

ssc-miR-148a启动子克隆及其特征分析

王萍1,郝文艳1,曹丽华1,沈开元1,代小丽1,李海艳1,梁贤威2,石德顺1*,李湘萍1*   

  1. (1.广西大学,亚热带农业生物资源保护与利用国家重点实验室,南宁 530005;2.中国农业科学院广西水牛研究所,南宁 530001)
  • 收稿日期:2015-11-19 出版日期:2016-10-23 发布日期:2016-10-23
  • 通讯作者: 李湘萍,研究员,博士生导师,E-mail:xiangpingli@163.com;石德顺,研究员,博士生导师,E-mail:ardsshi@gxu.edu.cn
  • 作者简介:王萍(1987-),女,山东济宁人,博士,主要从事动物遗传育种与繁殖研究,E-mail:wangping.online@163.com
  • 基金资助:

    广西壮族自治区研究生教育创新计划项目(YCBZ2014013);国家自然科学基金(31560632);广西自然科学基金项目(2014GXNSFAA118084);广西水牛遗传繁育重点实验室开放课题项目(SNKF-2014-03)

Cloning and Analysis of ssc-miR-148a Promoter

WANG Ping 1,HAO Wen-yan 1,CAO Li-hua 1,SHEN Kai-yuan 1,DAI Xiao-li 1,LI Hai-yan 1,LIANG Xian-wei 2,SHI De-shun 1*,LI Xiang-ping 1*   

  1. (1.State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresource,Guangxi University,Nanning 530005,China;2.Buffalo Research Institute,Chinese Academy of Agricultural Sciences,Nanning 530001,China)
  • Received:2015-11-19 Online:2016-10-23 Published:2016-10-23

摘要:

为研究猪miR-148a(ssc-miR-148a)的转录调控机制,对其启动子进行了克隆及分析。本试验首先设计特异性PCR扩增引物,分别得到ssc-miR-148a前体上游3个片段,并将其连接到荧光素酶报告载体pGL3-Basic上。通过生物信息学方法,在线分析ssc-miR-148a启动子大概区域、甲基化部位和转录因子结合部位。将重组报告质粒转染293T细胞,分析启动子活性。采用不同浓度碱性成纤维生长因子(bFGF)处理猪成纤维细胞和转染有重组报告质粒的猪成纤维细胞,检测ssc-miR-148a和DNA甲基化转移酶1(DNMT1)的表达,及其对启动子活性的影响。结果显示,克隆得到的ssc-miR-148a启动子区2 043 bp片段具有启动子活性,该序列存在5个CpG岛、Sp1及AP2等转录因子结合位点。 0、5和10 ng•mL-1浓度bFGF处理猪成纤维细胞和转染重组报告质粒的猪成纤维细胞后,ssc-miR-148a表达均显著下降(P<0.05),DNMT1 mRNA显著增加(P<0.05)。启动子活性均显著下降(P<0.05),5和10 ng•mL-1浓度间无显著差异(P>0.05)。结果表明,ssc-miR-148a启动子位于前体上游2 043 bp片段内,启动子区域有转录因子SP1结合位点,其表达受bFGF的调控。

Abstract:

In order to understand the transcriptional regulatory mechanism of ssc-miR-148a,we have cloned and analyzed its promoter.Firstly,we designed specific PCR primers to amplify 3 upstream fragments of ssc-miR-148a precursors,then inserted them into pGL3-Basic expression vector.Based on the amplified fragments,ssc-miR-148a promoter region,methylation sites and transcription factor binding sites were predicted by bioinformatics.The plasmid was transfected into 293T cells to analyze the promoter activity.Expression of ssc-miR-148a and DNA methylation transferase 1 (DNMT1) in treated porcine fibroblasts by Basic Fibroblast Growth Factor(bFGF)with different concentrations was detected.The results showed that the cloned 2 043 bp sequence had promoter activity,which had 5 CpGs and transcriptional factor binding sites,such as Sp1,AP2.After treated porcine fibroblasts with 0,5 and 10 ng•mL-1 bFGF,the expression of ssc-miR-148a was decreased significantly(P<0.05),DNMT1 mRNA level increased significantly (P<0.05).The promoter activity significantly reduced (P<0.05),but no significant difference between 5 and 10 ng•mL-1 concentrations (P>0.05).The results indicate that the promoter region of ssc-miR-148a locate at -2 043 bp,which has Sp1 transcription factor binding sites.The expression of ssc-miR-148a is regulated by the bFGF.

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