概括
转基因小鼠具有重新排列的免疫球蛋白Mu重链基因,可以防止内源基因进一步的DNA重排列. 这表明成功重组的基因积极地阻断了B细胞的进一步遗传变化.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 免疫球蛋白 (Ig) 基因重组对于B细胞发育至关重要.
- 了解Ig基因重组的调节是免疫系统功能的关键.
研究的目的:
- 研究微注射的重排列免疫球蛋白Mu重链基因对转基因小鼠内源性Ig基因DNA重排列的影响.
- 为了确定内源性IgDNA重组被阻断的阶段.
主要方法:
- 携带重新排列的Ig mu重链基因的转基因小鼠的生成.
- 从转基因和正常幼鼠的B前细胞中分离和分析阿贝尔森小鼠白血病病毒 (A-MuLV) 细胞系.
- 检测mu基因RNA,mu重链蛋白和JH等位基因.
主要成果:
- 转基因A-MuLV细胞系合成微注射mu基因RNA和mu重链蛋白,与大多数正常小鼠A-MuLV转基因不同.
- 显著的百分比 (40%) 的转基因系保留了生殖系JH等位基因,这表明重链DNA连接阶段内源性Ig DNA重排的阻断.
- 在10%的转基因杂交瘤中也发现了生殖系JH等位基因.
结论:
- 一个成功重组的重链基因产品的存在积极地阻止了内源性Ig基因的进一步的DNA重组.
- 这一发现支持B细胞发育过程中受调节的基因重组模型.
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