Despite extensive correlations, a direct functional relationship has not yet been established between the highest levels of chromatin folding, or large-scale chromatin structure, and regulation of transcription. Similarly, despite extensive correlations of changes in intranuclear gene positioning and association with specific nuclear compartments, we still do not know how genes change intranuclear positions and associations, let alone understand the functional consequences of these changes. Our long-term objectives are to determine the large-scale chromatin folding and intranuclear positioning of specific gene loci, to identify the cis and trans determinants of this folding and intranuclear positioning, and to understand the functional significance of this level of chromatin organization with regard to transcriptional regulation.
The specific aims of this proposal are to: : 1. Determine the relationship between large-scale chromatin compaction versus transcriptional activation. 2. Determine the relationship between nuclear speckle compartmentalization versus transcriptional activity and/or RNA processing. 3. Determine the relationship between localization to the nuclear periphery and specific epigenetic modifications versus transcription activity and induction. This project will exploit a novel system using BAC transgenes to reconstitute key features of endogenous gene loci as well as new methodologies for visualizing specific chromosome loci in live cells and at the ultrastructural level. Our project will critically test both old and new models for how the highest levels of chromatin folding modulate gene expression. Additional impact on a still wider range of basic science and biotechnology will come from our continued development of new technology for visualizing chromosome structure and dynamics and application of these methods for improved transgene and multi-transgene expression.

Public Health Relevance

A major impediment to development of gene therapy methods is our incomplete understanding of how to ensure high and sustained levels of expression from transgenes. Insight from our studies should be useful in guiding the design of future gene constructs and artificial chromosomes used in gene therapy.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM058460-16
Application #
8668979
Study Section
Nuclear and Cytoplasmic Structure/Function and Dynamics Study Section (NCSD)
Program Officer
Preusch, Peter
Project Start
1999-02-01
Project End
2015-05-31
Budget Start
2014-06-01
Budget End
2015-05-31
Support Year
16
Fiscal Year
2014
Total Cost
$348,615
Indirect Cost
$108,409
Name
University of Illinois Urbana-Champaign
Department
Anatomy/Cell Biology
Type
Schools of Arts and Sciences
DUNS #
041544081
City
Champaign
State
IL
Country
United States
Zip Code
61820
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Tasan, Ipek; Sustackova, Gabriela; Zhang, Liguo et al. (2018) CRISPR/Cas9-mediated knock-in of an optimized TetO repeat for live cell imaging of endogenous loci. Nucleic Acids Res 46:e100
van Steensel, Bas; Belmont, Andrew S (2017) Lamina-Associated Domains: Links with Chromosome Architecture, Heterochromatin, and Gene Repression. Cell 169:780-791
Teng, Kai Wen; Ishitsuka, Yuji; Ren, Pin et al. (2016) Labeling proteins inside living cells using external fluorophores for microscopy. Elife 5:
Tajik, Arash; Zhang, Yuejin; Wei, Fuxiang et al. (2016) Transcription upregulation via force-induced direct stretching of chromatin. Nat Mater 15:1287-1296
Deng, Xiang; Zhironkina, Oxana A; Cherepanynets, Varvara D et al. (2016) Cytology of DNA Replication Reveals Dynamic Plasticity of Large-Scale Chromatin Fibers. Curr Biol 26:2527-2534
Kaya-Okur, Hatice S; Belmont, Andrew S (2015) CRISPR EATING on a Low Budget. Dev Cell 34:253-4
Khanna, Nimish; Hu, Yan; Belmont, Andrew S (2014) HSP70 transgene directed motion to nuclear speckles facilitates heat shock activation. Curr Biol 24:1138-44
Belmont, Andrew S (2014) Large-scale chromatin organization: the good, the surprising, and the still perplexing. Curr Opin Cell Biol 26:69-78
Khanna, Nimish; Bian, Qian; Plutz, Matt et al. (2013) BAC manipulations for making BAC transgene arrays. Methods Mol Biol 1042:197-210

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