QUANTITATIVE GENETIC ANALYSIS OF SIGNAL TRANSDUCTION

拟议研究的长期目标是确定如何 参与信号转导的特定蛋白质的分子变异 途径有助于表型变异。该项目的重点是 与翅形和光感受器变异相关的发育途径 在果蝇中。一般的方法是使用遗传"测试者"背景， 具有吉布森博士所显示的选择性的低形态和高形态突变， 表达的修饰语。他提出，这些修饰因子是同一基因中的基因， 信号转导通路有助于潜在的微妙的，也许是隐蔽的 自然种群中的遗传变异。在这些"敏感"的 背景测量的表型效应被映射到候选基因， 相关EGF-Ras通路使用关联或连锁不平衡 作图，如已被用于定义自然环境中刚毛变异的QTL 种群D.黑腹菌目前的目标不是确定 负责功能变异的特定突变，但要量化 途径中不同位点的相对效应。

The long-term objective of the proposed study is to establish how molecular variation in specific proteins involved in a signal transduction pathway contributes to phenotypic variation. The project focuses on the developmental pathways associated with wing shape and photoreceptor variation in Drosophila. The general approach is to use genetic "tester" backgrounds that bear selected hypo- and hypermorphic mutations shown by Dr. Gibson to reveal modifiers of expression. He proposes that these modifiers are genes in the same signal transduction pathway that contribute to potential subtle perhaps cryptic standing genetic variation in natural populations. In these "sensitized" backgrounds measured phenotypic effects are mapped to the candidate genes of the associated EGF-Ras pathway using association or linkage disequilibrium mapping, as has been used to define QTLs for bristle variation in natural populations of D. melanogaster. The objective at this point is not to identify specific mutations responsible for functional variation yet, but to quantify relative effects of different loci in the pathway.