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This proposal is significant because we propose a novel model forthe role of nuclear organization in regulating gene expression: 1) Nuclear speckles and still unknown nuclearcompartments/bodies help organize other phase-separated condensates to modulate gene expression; 2)Nuclear speckles together with surrounding nuclear compartments/bodies and associated phase-separatedcondensates together represent active nuclear niches which may have different functional properties; 3) Smalldistances matter: gene movements of only a few hundred nm between repressive and these different activenuclear niches may differentially regulate gene expression; 4) Action-at-a distance: component flux into andout of these nuclear compartments will have global effects on gene expression; 5) These same nuclearcompartments/bodies may similarly modulate RNA processing and organize nuclear export. Here we propose to: 1) Identify multiple components of known and still unknown nuclear \u201cactiveniches\u201d; 2) Map genome-wide the positions and predicted movements of genes relative to these active nichesduring physiological transitions; 3) Visualize nuclear body/compartment dynamics and fluxes of proteinsbetween nuclear bodies in steady-state and through physiological transitions; 4) Visualize movements ofreporter transgenes, endogenous genes, and rewired chromosome loci relative to these nuclearbodies/compartments and temporally correlate changes in gene expression with their dynamic movements andcompartment associations; 5) Visualize movements of pre-mRNAs and nuclear mRNAs during RNAprocessing and export; 6) Measure fluxes of nuclear body components to and from adjacent transcribingchromatin. Additionally, we propose developing relatively low-cost, novel microscope platforms and softwarespecifically designed to facilitate these live-cell imaging goals in our laboratories as well as others. Our Aims will be to: 1. Map proteins, genes, RNAs relative to active nuclear compartment(s) usingiterative rounds of TSA-MS-Ratio, validation by light microscopy, and TSA-Seq; 2. Measure dynamics ofbodies, components of nuclear bodies using live-cell imaging; 3. Measure temporal correlation betweenchanges in gene expression and gene movement relative to nuclear bodies and visualize the export path ofexpressed transcripts; 4. Design and deliver two novel microscopes designed to facilitate Aims 1-3 at amodest cost. Successful completion of these Aims should significantly change our current understanding of therole of nuclear organization in regulating gene expression with impact across a wide range of research fields.\"", "@type": ["Award", "Item"], "center_title": "Belmont", "status": "current", "pi": {"error": "no view permissions"}, "principals_allowed": {"view": ["system.Everyone"], "edit": ["group.admin"]}}, "md5sum": "feb76a9555b7f009255e0cfeea77f2a2", "status": "released", "aliases": ["belmont-lab:U2OS_DDX39B_2xDTT_bio2_rep1_hg38.bw"], "filename": "U2OS_DDX39B_2xDTT_bio2_rep1_hg38.bw", "accession": "4DNFI9PYJ45S", "file_size": 1117145, "file_type": "normalized counts", "description": "20kb bin (read normalized) count track", "file_format": {"status": "released", "file_format": "bw", "display_title": "bw", "uuid": "d1311111-218e-4f61-aaf0-91f226248b2c", "@id": "/file-formats/bw/", "@type": ["FileFormat", "Item"], "principals_allowed": {"view": ["system.Everyone"], "edit": ["group.admin"]}}, "higlass_uid": "5f3c805b-b6e7-42ce-b146-f34646cca02b", "date_created": "2025-07-21T18:53:38.134246+00:00", "submitted_by": {"error": "no view permissions"}, "last_modified": {"modified_by": {"error": "no view permissions"}, "date_modified": "2025-09-05T17:46:53.007814+00:00"}, "produced_from": ["belmont-lab:U2OS_2xDTT_DDX39B_PULLDOWN_bio2_rep1_GCCAATAT-AGATCTCG_L002_R1_001.fastq", "belmont-lab:U2OS_2xDTT_DDX39B_INPUT_bio2_rep1_ACAGTGAT-AGATCTCG_L002_R1_001.fastq"], "content_md5sum": "feb76a9555b7f009255e0cfeea77f2a2", "public_release": "2025-08-27", "schema_version": "3", "static_content": [{"content": {"title": "4DNFI9PYJ45S - 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