EPIGENETIC ACTIVATION OF THE HUMAN GROWTH HORMONE GENE

人类生长激素基因的表观遗传激活

• 批准号: 6712116
• 负责人: YUGONG HO
• 金额: $ 9.94万
• 依托单位: UNIVERSITY OF PENNSYLVANIA
• 依托单位国家: 美国
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6712116
• 关键词: acetylation; chromatin; functional /structural genomics; gene expression; genetic promoter element; genetic regulatory element; genetic transcription; genetically modified animals; laboratory mouse; nucleic acid quantitation /detection; regulatory gene; somatotropin; transfection

DESCRIPTION (provided by applicant): A tissue-specific locus control region (hGH LCR) regulates the human growth hormone (hGH) gene cluster. The components of the hGH LCR, marked by DNase I hypersensitive sites (HS), are located from 14.5 to 32 kb upstream of the hGH cluster. We have defined HSI, at -14.5 kb, as the major enhancer component of the hGH LCR in pituitary somatotropes. This determinant plays an essential and non-redundant role in hGH-N transgene activation in the mouse pituitary. The hGH LCR and hGH-N gene are encompassed within a continuous 32 kb somatotrope-specific acetylated chromatin domain. HSI contains an array of three binding sites for the pituitary-specific POU-homeodomain trans-factor, Pit-1. These core determinants of HSI are critical for establishment of the broad acetylated domain and for the activation of the hGH-N gene during development. To extend the mechanistic understanding of hGH LCR action we propose the following three aims. Aim 1. Define cis- and trans-effectors of LCR-mediated long-range transcriptional enhancement. This aim will focus on the identification of the full complement of cis- and trans-regulatory elements that facilitate HSI-mediated long-range activation of the hGH-N promoter over a distance of 14.5 kb and that define the borders of the modified chromatin domain. Aim II. Define the mechanism of acetylation spreading within the hGH LCR. This aim will address the mechanisms by which these determinants establish an extensive domain of chromatin modification and trigger long-range gene activation of the target hGH-N promoter. Aim III. Establish functional relationships between specific hGH LCR activities and the sub-nuclear localization of the hGH locus. This aim will utilize a series of transgenes that reflect a matrix of LCR activities to establish the linkages between LCR functions and sub-nuclear localization of the hGH locus. Significantly, the proposed studies will provide the P.I. the opportunity to fully exploit a set of time-intensive but highly informative mouse transgenic studies, broadening and strengthening his scientific capabilities in preparation for an independent career as an academic researcher

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