Epigenetic and post-translational modifier regulation of juvenile hormone action

保幼激素作用的表观遗传和翻译后修饰调节

• 批准号: 9028572
• 负责人: SUBBA R PALLI
• 金额: $ 28万
• 依托单位: UNIVERSITY OF KENTUCKY
• 依托单位国家: 美国
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-02-01 至 2020-01-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9028572
• 关键词: Acetylation; Adult; Agonist; Biological; Biological Assay; Biological Metamorphosis; Biological Models; CHD1 gene; Cell Culture Techniques; Cells; Chromatin; Culicidae; Cyclic AMP-Responsive DNA-Binding Protein; DNA; Development; Disease; Disease Vectors; Ecdysone; Ecdysteroids; Ensure; Epigenetic Process; Event; Food; Gene Expression Regulation; Genes; Helix-Turn-Helix Motifs; Histone Acetylation; Histone Deacetylase; Histone Deacetylase Inhibitor; Histone H3; Histones; Homologous Gene; Hormone Receptor; Hormones; Human; Insect Control; Insect Vectors; Insecta; Insecticides; Juvenile Hormones; Knowledge; Laboratories; Lead; Livestock; Lysine; Mass Spectrum Analysis; Mediating; Medicine; Methods; Methoprene; Molecular; Molting; Nuclear Proteins; Outcome Study; Physiological; Play; Post-Translational Protein Processing; Post-Translational Regulation; Proteins; RNA Interference; Regulation; Reporter; Reproduction; Research; Role; Steroid Receptors; Testing; Tissues; Transferase; Tribolium; Trichostatin A; Vertebrates; base; brahma; genome sequencing; hormone regulation; human disease; method development; novel; promoter; public health relevance; receptor; research study; response; success; transcription factor; vector control; whole genome; yeast two hybrid system

 DESCRIPTION (provided by applicant): There has been a continuous demand for the development of insect control methods that are target-specific. Juvenile hormone (JH) and ecdysteroids are the major hormones that regulate development and reproduction in insects. Since these hormones are not present in vertebrates, they represent attractive targets for the development of insect control methods. Hindering this effort is the lack of understanding on the molecular basis of JH action. Tremendous progress has been made in understanding JH action at the molecular level during the past few years. A bHLH transcription factor, methoprene tolerant (Met), has been identified as a JH receptor. A steroid receptor co-activator homologue (SRC/Taiman/FISC) and Cycle have been identified as important co-factors involved in JH action. Kruppel homologue (Kr-h1) and bHLH transcription factor, Hairy and E93 have been identified as important transcription factors that mediate JH action. Preliminary experiments showed that Cyclic AMP response-element binding protein (CBP) is required for acetylation of histone H3 as well as for JH induction of JH-response genes in Tribolium castaneum tissues, TcA and Aag-2 cells. In addition, histone deacetylase (HDAC) inhibitor, Trichostatin A (TSA) also induces expression of JH-response genes in TcA and Aag-2 cells. Chromatin modifiers Brahma, Snr1 and CHD1 but not DNA methyl transferase are required for regulation of metamorphosis and reproduction in T. castaneum. JH exerts diverse functions in different tissues and under various physiological conditions. We hypothesize that epigenetic and post- translational modification of proteins involved in JH action play critical roles in multi-dimensionl gene regulation strategies employed by JH. Therefore, the main objective of this proposal is to capitalize on these latest developments to identify epigenetic modifiers and determine their mechanisms of action in modulation of JH response using T. castaneum, TcA and Aag-2 cells. The two Specific Aims of the proposal are 1. To identify key players involved in epigenetic and post-translational modifier regulation of JH action and 2. To determine the mechanisms involved in epigenetic and post-translational modifier regulation of JH action. In the first Specific Aim, w will employ RNAi, cell culture and reporter assays to identify and characterize key proteins including histone acetyl transferases (HAT), HDACs and chromatic modifiers involved in modulation of JH action. Temporal, spatial and hormonal regulation of identified genes as well as their function in JH action will be determined. In the second Specific Aim, we will employ mass spectrometry, RNAi, two-hybrid, pull- down, Chip and reporter assays to identify acetylated lysines in Met, domains of HATs, HDACs and Brahma, Snr1 and CHD1 required for JH action, localize HATs, HDACs and Brahma, Snr1 and CHD1 on Kr-h1, Hairy and E93 promoters and identify interacting partners of HATs, HDACs, Brahma, Snr1 and CHD1. The expected outcome of this study, an understanding of the molecular basis of JH action and identification of critical proteins involved in JH action will help in development of methods for control of insect vectors. The proposed studies will also advance our knowledge on epigenetic and post-translational modification of histones and other nuclear proteins especially on the functions and mechanisms of action of the modifiers.