RNA METABOLISM IN DEVELOPMENT AND HORMONAL REGULATION

发育和荷尔蒙调节中的 RNA 代谢

• 批准号: 3277990
• 负责人: JOEL L KEY
• 金额: $ 16.79万
• 依托单位: UNIVERSITY OF GEORGIA
• 依托单位国家: 美国
• 财政年份: 1981
• 资助国家: 美国
• 起止时间: 1981-08-01 至 1991-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3277990
• 关键词: DNA directed RNA polymerase; Leguminoseae; RNA; RNA biosynthesis; autoradiography; cell cycle; cell growth regulation; complementary DNA; enzyme linked immunosorbent assay; eukaryote; gene expression; genetic manipulation; genetic mapping; genetic promoter element; genetic transcription; genetic translation; hormone regulation /control mechanism; messenger RNA; molecular cloning; nucleic acid metabolism; nucleic acid sequence; plant growth /development; plant population genetics; polyadenylate; radiotracer; tissue /cell culture

The objectives are to understand how hormones regulate gene expression and to correlate hormone-induced changes in gene expression with hormone-mediated changes in growth and development. The specific research aims are to analyze the role(s) of auxin-regulated gene expression in the growth responses mediated by this hormone in soybean seedling tissues. The growth responses of major interest are the control of cell elongation by auxin and the induction of massive tissue proliferation by auxin. A number of cDNA clones have been isolated, and additional clones will be identified, which are representative of mRNAs whose cytoplasmic concentrations increase or decrease rapidly and selectively following auxin treatment. The expression of these mRNAs will be assessed during various developmental stages, auxin-induced growth, and interactions of auxin with other hormones and growth regulators which result in altered and/or aberrant growth responses. Genes that encode these auxin-responsive mRNAs will be sequenced in order a) to determine the amino acid sequence and some properties of the encoded protein, b) to identify conserved regions which may be important to the regulation of their expression, and c) to define antigenic regions of the protein for peptide synthesis and antibody production. Antibodies will be used to identify the cellular localization of the relevant proteins and to quantify their abundance during the noted growth transitions. Auxin responsive genes will be cloned into T-DNA vectors and used in transformation experiments. These experiments are designed to evaluate which sequences are important to the developmental and hormone-regulated pattern of gene expression. Additionally, they will assess the physiological consequences of over expression of the gene (using very strong constitutive or inducible promoters) or of under expression of the gene (using these same promoters to express the negative strand to suppress translation of the mRNA). As progress is made in understanding the role of auxin-regulated gene expression during physiological responses to auxin (e.g. cell elongation or cell proliferation) and in defining cis-elements important in controlling the expression of these genes, analyses of trans-acting factors essential in the selective regulation of these genes will be initiated.

其目的是了解荷尔蒙如何调节基因表达和 将激素诱导的基因表达变化与 荷尔蒙调节生长发育的变化。具体研究 目的是分析生长素调节的基因表达在植物生长中的作用(S) 大豆幼苗组织中由该激素介导的生长反应。这个 主要关注的生长反应是通过以下方式控制细胞伸长 生长素和生长素诱导的大量组织增殖。一个数字 %的cdna克隆已被分离，并将进一步克隆 经鉴定，它们代表了其细胞质中 生长素后浓度有选择地快速增加或减少 治疗。这些mRNAs的表达将在不同的 生长素诱导的生长发育阶段及其与生长素的相互作用 其他激素和生长调节剂，导致改变和/或 异常的生长反应。编码这些生长素反应基因的基因 将按a)顺序进行测序，以确定氨基酸序列和一些 编码蛋白的性质，b)识别 可能对它们的表达调控很重要，以及c)定义 多肽合成蛋白和抗体的抗原区 制作。抗体将被用来识别细胞定位 相关蛋白质的含量，并在注意到的 增长转型。生长素反应基因将被克隆到T-DNA中 向量，并用于变换实验。这些实验是 旨在评估哪些序列对发育和 激素调节的基因表达模式。此外，他们还将 评估基因过度表达的生理后果(使用 非常强的构成或可诱导的启动子)或表达不足 基因(使用这些相同的启动子来表达负链以 抑制信使核糖核酸的翻译)。随着在理解上取得进展 生长素调节的基因表达在生理反应中的作用 与生长素(如细胞伸长或细胞增殖)有关，并在定义 顺式元件对控制这些基因的表达很重要， 选择性规制中的交易要素分析 这些基因将被启动。