畜牧兽医学报 ›› 2016, Vol. 47 ›› Issue (6): 1162-1169.doi: 10.11843/j.issn.0366-6964.2016.06.011

• 遗传繁育 • 上一篇    下一篇

共表达3种纤维素降解酶的转基因小鼠模型的建立与分析

何祖勇1# ,刘志国1,2# ,孙燕霞1,丛佩清1,陈瑶生1*   

  1. (1.中山大学生命科学学院,有害生物控制与资源利用国家重点实验室,广州 510006;2.中国农业科学院北京畜牧兽医研究所,北京 100193)
  • 收稿日期:2015-11-19 出版日期:2016-06-23 发布日期:2016-06-23
  • 通讯作者: 陈瑶生,教授,主要从事动物遗传育种研究,E-mail:chyaosh@mail.sysu.edu.cn
  • 作者简介:何祖勇(1981-),男,福建莆田人,副教授,博士,主要从事动物生物技术研究,E-mail:zuyonghe@foxmail.com,Tel:020-39943536;刘志国(1986-),男,河北唐山人,助理研究员,博士,主要从事胚胎工程与转基因动物研究,E-mail: zhiguoliu2010@126.com,Tel:010-62813339。何祖勇和刘志国为共同第一作者
  • 基金资助:

    广东省自然科学基金项目(U1201213);国家转基因动物新品种培育重大专项(2014ZX08006005-005)

Generation of a Transgenic Mouse Model Co-expressing Three Fibrolytic Enzyme Genes

HE Zu-yong1#,LIU Zhi-guo1,2#,SUN Yan-xia1,CONG Pei-qing1,CHEN Yao-sheng1*   

  1. (1.State Key Laboratory of Biocontrol,School of Life Sciences,Sun Yat-Sen University,Guangzhou 510006,China;2.Institute of Animal Science,Chinese Academy of Agricultural Sciences,Beijing 100193,China)
  • Received:2015-11-19 Online:2016-06-23 Published:2016-06-23

摘要:

本研究旨在应用转基因技术制作能特异性分解纤维素和木质素的转基因单胃动物,对于培育高饲料转化率的家畜具有重要的研究意义。利用2A肽策略构建由EF1α启动子驱动的可同时表达3种能够降解纤维素和木质素的酶(EGXA、BGL4和XYNB)的真核表达载体,并通过原核显微注射技术获得同时表达3种酶的转基因小鼠。经检测发现,2A肽能够介导3种酶同时在HEK293A细胞中正常表达。通过酶活分析、Western blot和免疫组织化学等检测发现,3种酶均能在转基因小鼠消化系统各组织中表达,并且具有正常活性。本研究结果表明,在EF1α启动子的控制下,2A肽能够在小鼠中介导EGXA、BGL4和XYNB的正常表达,并成功建立表达外源纤维素酶和木质素酶的转基因小鼠模型,为培育具有高饲料转化率的动物奠定研究基础。

Abstract:

By expressing fibrolytic enzymes targeting cellulose and xylan through transgenic technology,new breeds of monogastric animals with enhanced feed conversion rates could be developed.Here we described the co-expression of cellulase genes EGXA and BGL4,and the xylanase gene XYNB,under the control of EF1α promoter and linked via 2A peptides,in both HEK293A cells and transgenic mice.Recombinant enzyme expression was detected in gastrointestinal tract as determined by both Western blot and immunohistochemistry,and were functionally active in cellulolytic enzyme assays.Notably,all 3 fibrolytic enzymes were highly expressed in the intestine tissue of transgenic mice.In summary,we have demonstrated that the EF1α promoter in conjunction with 2A peptide sequences could successfully mediate the co-expression of EGXABGL4 and XYNB genes in transgenic mice.The study presents a feasible method for generating genetically modified animals with enhanced feed conversion ability.

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