在Drosophila中高频P元素的损失是同类基因依赖的
W R Engels1, D M Johnson-Schlitz, W B Eggleston
1Genetics Department, University of Wisconsin, Madison 53706.
Cell
|August 10, 1990
概括
在高频率下,Drosophila melanogaster中的P可转移元素可以被精确地丢失. 这一过程涉及P转基因酶和双链间隙修复,为定位基因突变产生提供了一种新的方法.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 德洛索菲拉黑虫研究 研究 科研
背景情况:
- P可转移元素是Drosophila melanogaster中发现的移动遗传序列.
- 精确的P元素的损失发生在一个显著的速度,超过13%的每一代.
- 这种损失机制与基因转换有相似之处,但表现出不同的特征.
研究的目的:
- 阐明了P可转换元素的精确损失背后的分子机制.
- 研究P转移酶和同源重组在这个过程中的作用.
- 探索这种现象的潜力,以开发Drosophila的位点定向突变发生技术.
主要方法:
- 对Drosophila melanogaster中P元素损失率的分析.
- 调查对同类野生类型插入点的要求.
- 抑制同源配对对P元素损失频率的影响的评估.
- 描述P转化酶在转化和修复过程中的作用.
主要成果:
- P可转换元件在每代13%以上的频率下经历精确损失.
- 该过程需要在插入点处有一个野生类型的同类物质,并且受到抑制配对的阻碍.
- 与经典的基因转换不同,P元素损失是单向的,发生在体细胞和前生物细胞中,并且取决于P转基因酶.
结论:
- 提出了一个模型,其中P元素通过"切入粘贴"进行转换,然后进行双链间隙修复,在捐赠点恢复元素.
- 这种机制为可转换元素动力学提供了新的理解.
- 这些发现表明,Drosophila melanogaster.的部位导向突变发生的新技术.
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