Human Apolipoprotein B Transgenic Mice Generated with 207- and 145-Kilobase Pair Bacterial Artificial Chromosomes

Human Apolipoprotein B Transgenic Mice Generated with 207- and 145-Kilobase Pair Bacterial Artificial Chromosomes
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用 207 和 145 千碱基对细菌人工染色体产生的人载脂蛋白 B 转基因小鼠

DOI:
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发表时间:
1997
影响因子:
4.8
通讯作者:
S. Young
S. Young
中科院分区:
生物学2区
文献类型:
--
作者:
L. Nielsen;S. Mccormick;V. Pierotti;Carmen Tam;M. Gunn;H. Shizuya;S. Young

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我们以前报道过,跨越人或小鼠载脂蛋白B基因的∼80千碱基对(Kb)P1噬菌体克隆(分别为克隆p158和p649)在转基因小鼠的肝脏中表达载脂蛋白B,但在肠道中不表达。我们推测,缺乏肠道表达是因为这些克隆缺乏控制肠道表达的远距离DNA元件。为了测试这种可能性,用145和207 kb的细菌人工染色体(BAC)产生了转基因小鼠,这些BAC含有人类apoB基因以及更广泛的5‘和3’侧翼序列。核糖核酸酶保护、原位杂交、免疫组织化学和遗传互补研究表明,BAC转基因小鼠在肠道和肝脏均有apoB基因的适当表达,表明两种BAC都含有远端肠道成分。为了确定调控元件是否位于apoB基因的5‘或3’,通过将p158与来自145 kb BAC的5‘或3’序列共显微注射胚胎而产生转基因小鼠。对这些小鼠的分析表明,apoB基因的肠道元件位于结构基因的5‘端。总的来说,转基因小鼠的研究表明,肠道元件位于载脂蛋白B基因的−33和−70kb 5‘之间。
We reported previously that ∼80-kilobase pair (kb) P1 bacteriophage clones spanning either the human or mouse apoB gene (clones p158 and p649, respectively) confer apoB expression in the liver of transgenic mice, but not in the intestine. We hypothesized that the absence of intestinal expression was due to the fact that these clones lacked a distant DNA element controlling intestinal expression. To test this possibility, transgenic mice were generated with 145- and 207-kb bacterial artificial chromosomes (BACs) that contained the human apoB gene and more extensive 5′- and 3′-flanking sequences. RNase protection, in situ hybridization, immunohistochemical, and genetic complementation studies revealed that the BAC transgenic mice manifested appropriate apoB gene expression in both the intestine and the liver, indicating that both BACs contained the distant intestinal element. To determine whether the regulatory element was located 5′ or 3′ to the apoB gene, transgenic mice were generated by co-microinjecting embryos with p158 and either the 5′- or 3′-sequences from the 145-kb BAC. Analysis of these mice indicated that the apoB gene’s intestinal element is located 5′ to the structural gene. Cumulatively, the transgenic mouse studies suggest that the intestinal element is located between −33 and −70 kb 5′ to the apoB gene.
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