MOLECULAR STUDIES OF RETINAL DEGENERATION IN DROSOPHILA

果蝇视网膜变性的分子研究

• 批准号: 3465821
• 负责人: Nansi J. Colley
• 金额: $ 10.04万
• 依托单位: UNIVERSITY OF CALIFORNIA, SAN DIEGO
• 依托单位国家: 美国
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1995-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3465821
• 关键词: Drosophilidae; cellular pathology; congenital eye disorder; cytogenetics; electron microscopy; electrophoresis; electroretinography; evolution; gene complementation; gene expression; gene mutation; genetic library; genetic mapping; genetic markers; genome; immunocytochemistry; immunoelectron microscopy; immunofluorescence technique; microscopy; molecular cloning; molecular pathology; nucleic acid sequence; protein sequence; retina degeneration; structural genes; transposon /insertion element; visual photoreceptor; western blottings

The overall objective of this project is to focus on newly generated insertional mutants which display retinal degeneration in Drosophila melanogaster. The strategy for accomplishing this goal involves a recently developed mutagenesis and screening procedure that utilizes P-transposable element containing vectors, called "enhancer trap". The specific aims are to study the cellular and molecular basis for the retinal degeneration using the following approaches. First, obtain lines of flies containing P-transposon insertions, and screen the lines for: 1) LacZ expression in the photoreceptors; 2) disruption of normal visual physiology by ERG analysis; and 3) evidence )f retinal degeneration. Second, the cytogenetic location of the P-transposon insertion will be determined and the effected gene will be cloned and subjected to a detailed molecular characterization. To ensure that the cloned DNA indeed corresponds to the mutated gene, genetic complementation with the cloned DNA will be carried out. We #W then focus on characterizing the gene product defined by the mutation, as well as a biochemical and physiological dissection of the retinal degeneration. Finally, the developmental program for gene expression will )e assessed and the phylogenetic distribution of the gene and its encoded products determined. A combination of these approaches is likely to lead to a characterization of the retinal degeneration, as well as provide important information on how the components of the photoreceptor cells function and are integrated. This project is part of a larger interest in genetically inherited retinal diseases that result in progressive retinal degeneration and eventual blindness. Retinitis pigmentosa (RP) is an example of such a disease in humans. However, due to the difficulty in obtaining human RP ocular tissues, much work has been carried out in animal models. The complexity of human RP degenerations suggest that each one may have a distinct genetic and chemical basis. Therefore, it is expected that results arising from this study will be relevant to at least one of the diseases.

该项目的总体目标是专注于新生成的 果蝇视网膜变性的插入突变体 黑猩猩。实现这一目标的战略包括最近 开发了利用P-转座的诱变和筛选程序 含有载体的元素，称为“增强子陷阱”。具体目标是 视网膜变性的细胞和分子基础研究 使用以下方法。首先，获取含有以下内容的苍蝇行 P-转座子插入，并筛选下列行：1)LacZ在 光感受器；2)ERG对正常视觉生理的干扰 分析；3)视网膜变性的证据。第二，细胞遗传学 将确定P-转座子插入的位置并影响 该基因将被克隆并进行详细的分子鉴定。 为了确保克隆的DNA确实与突变的基因相对应， 将与克隆的DNA进行遗传互补。那么我们#W。 也要关注由突变定义的基因产物的特征 作为对视网膜变性的生化和生理学解剖。 最后，将对基因表达的发展计划进行评估和 该基因及其编码产物的系统发育分布 下定决心。这些方法的组合可能会导致 视网膜退行性变的特征，以及提供重要的 光感受器细胞的组成如何起作用的信息以及 是一体化的。 这个项目是人们对遗传视网膜的更大兴趣的一部分 导致进行性视网膜变性并最终导致 失明。视网膜色素变性(RP)是这种疾病的一个例子。 人类。然而，由于获取人RP眼的难度较大 在组织方面，已经在动物模型中进行了大量的工作。的复杂性 人类的RP退变表明每个人可能有一个不同的基因 和化学基础。因此，预计产生的结果是 这项研究将与至少一种疾病相关。