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Updated: Jan 3, 2026

Quantitative Analysis of Alternative Pre-mRNA Splicing in Mouse Brain Sections Using RNA In Situ Hybridization Assay
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Gene expression amplification by nuclear speckle association.

Jiah Kim1, Neha Chivukula Venkata2, Gabriela Andrea Hernandez Gonzalez2

  • 1Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, IL.

The Journal of Cell Biology
|November 24, 2019
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Summary
This summary is machine-generated.

Gene positioning near nuclear speckles amplifies gene expression. Active genes near these compartments show significantly higher HSPA1B and Hsp70 mRNA levels after heat shock, demonstrating a spatial effect on transcription.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Active genes often localize near nuclear speckles, but the functional relevance of this proximity remains unclear.
  • Nuclear speckles are dynamic liquid-droplet compartments within the nucleus.

Purpose of the Study:

  • To investigate the functional significance of gene positioning relative to nuclear speckles.
  • To determine if proximity to nuclear speckles influences gene expression levels, particularly under stress conditions.

Main Methods:

  • Utilized HSPA1B BAC transgenes and endogenous Hsp70 genes in live-cell imaging.
  • Measured nascent transcript levels and total mRNA counts at various time points after heat shock.
  • Correlated gene positioning relative to nuclear speckles with gene expression output and RNA degradation pathways.

Main Results:

  • HSPA1B and Hsp70 genes activate rapidly after heat shock, regardless of speckle association.
  • Speckle-associated alleles exhibit twofold higher HSPA1B mRNA and nascent transcript levels 15 minutes post-heat shock.
  • Significant fold-increases in nascent transcripts for speckle-associated HSPA1B transgenes (12-56x) and endogenous genes (3-7x) observed 1-2 hours after heat shock.
  • Increased nascent transcript levels correlate with reduced exosome RNA degradation and larger RNA polymerase II foci.

Conclusions:

  • Gene positioning relative to nuclear speckles is a key factor in regulating gene expression.
  • Proximity to nuclear speckles can lead to "gene expression amplification," enhancing transcriptional output.
  • This spatial regulation provides a mechanism for modulating gene activity in response to cellular conditions.