遗传 ›› 2008, Vol. 30 ›› Issue (3): 341-346.doi: 10.3724/SP.J.1005.2008.00341

• 研究报告 • 上一篇    下一篇

骨形成蛋白4条件性RNA干扰小鼠的建立

李福兵; 杜晓兰; 余瑛; 赵玲; 何启芬; 陈林   

  1. 第三军医大学大坪医院野战外科研究所全军创伤中心, 创伤、烧伤、复合伤国家重点实验室, 重庆 400042

  • 收稿日期:2007-10-17 修回日期:2007-12-24 出版日期:2008-03-10 发布日期:2008-03-10
  • 通讯作者: 陈林

Generation of bone morphogenetic protein 4 conditional RNA inter-ference mice

LI Fu-Bing; DU Xiao-Lan; YU Ying; ZHAO Ling; HE Qi-Fen; CHEN Lin

  

  1. State Key Laboratory of Trauma, Burns and Combined Injury, Trauma Center, Institute of Surgery Research, Daping Hospital, Third Mili-tary Medical University, Chongqing 400042, China
  • Received:2007-10-17 Revised:2007-12-24 Online:2008-03-10 Published:2008-03-10
  • Contact: CHEN Lin

摘要:

为研究骨形成蛋白4(Bone morphogenetic protein 4, BMP4)在骨骼发育中的作用, 我们以含有LoxPneo的pBSK/U6载体为骨架, 构建小鼠BMP4条件性RNAi(conditional RNA interference), CRNA; 载体(BMP4CRNAi), 经KpnⅠ和AflⅢ双酶切获取针对bmp4并含neo基因的目的干扰片段, 纯化后的目的片段显微注射入0.5 d的FVB/NJ小鼠受精卵, 并植入同期发情的假孕母鼠中, 获取G0代转基因小鼠; 利用PCR对G0代转基因小鼠基因型进行鉴定, PCR阳性的小鼠与FVB/NJ小鼠交配, 最终获取稳定传代的BMP4CRNAi小鼠。稳定传代的BMP4CRNAi小鼠与成骨和软骨前体细胞表达Cre的转基因小鼠(Col2a1-Cre)交配, 获取BMP4Col2a1-CRNAi小鼠。分离BMP4Col2a1-CRNAi小鼠原代软骨细胞, 提取总RNA, 利用半定量RT-PCR检测RNA干扰效率。小鼠基因型鉴定结果表明:成功获得条件性RNAi转基因小鼠; BMP4干扰效率检测结果表明:在软骨细胞中BMP4的干扰效率为81%。以上结果表明, 我们成功制备了BMP4CRNAi小鼠和BMP4Col2a1-CRNAi小鼠, BMP4CRNAi小鼠与不同Cre转基因小鼠交配, 可以研究BMP4在不同细胞、组织和器官的功能, BMP4Col2a1-CRNAi小鼠的获得为研究BMP4在软骨发育中的作用提供了合适的动物模型。

关键词: 条件性敲低, 转基因, 条件性RNA干扰, 骨形成蛋白4

Abstract:

To explore bone morphogenetic protein 4 (BMP4) function in the developing bone, a BMP4 conditional RNA interference (CRNAi) vector was constructed based on the pBSK/U6 vector with a LoxPneo cassette. The transgene fragment targeting bmp4 was obtained by KpnⅠ and AflⅢ double digestion and was purified before being microinjected into fertilized eggs from FVB/NJ mice. BMP4CRNAi transgenic mice were genotyped by PCR. And the PCR positive mice were crossed with Col2a1-Cre transgenic mice, whose Cre recombinase was specifically expressed in osteo-chondro-progenitor cells. Bmp4 mRNA expression in primary chondrocytes were examined by semi-quantitive RT-PCR to determine RNA interference efficiency. Results showed that BMP4CRNAi mice and BMP4 Col2a1-CRNAi mice were produced successfully, and bmp4 knockdown efficiency in primary chondrocytes of BMP4 Col2a1-CRNAi mice was 81%. This transgenic mouse line provides excellent model for studying the role of BMP4 in chondrocyte development, and BMP4CRNAi mouse may be a good model for studying the role of BMP4 in different cells, tissues and organs through crossing with different Cre transgenic mice.