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U1 snRNP telescripting regulates a size-function-stratified human genome.

Jung-Min Oh1, Chao Di1, Christopher C Venters1

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This summary is machine-generated.

U1 snRNP (U1) prevents premature gene transcription termination in large genes. Inhibiting U1 boosts small gene expression, revealing a size-based gene regulation mechanism crucial for cellular responses.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Gene Regulation

Background:

  • U1 snRNP (U1) is essential for RNA splicing and a process called telescripting.
  • Telescripting suppresses premature cleavage and polyadenylation (PCPA), a mechanism that can prematurely terminate transcription.

Purpose of the Study:

  • To investigate the role of U1 telescripting in regulating transcription elongation, particularly in large genes.
  • To determine if U1 telescripting acts as a gene-size-based mRNA regulation mechanism.

Main Methods:

  • U1 inhibition was performed in human cells.
  • Analysis of transcription elongation, PCPA, and spliced-mRNA productivity in both large and small genes.
  • Functional enrichment analysis of genes affected by U1 inhibition.

Main Results:

  • U1 telescripting is critical for maintaining transcription elongation in large genes (median 39 kb), preventing PCPA.
  • Large genes naturally experience transcription attrition due to PCPA.
  • Small genes (median 6.8 kb) were not sensitive to PCPA and showed increased mRNA productivity upon U1 inhibition.
  • Upregulated small genes were enriched in acute stimuli and cell-survival functions, while PCPA-affected genes were linked to cell-cycle and development.

Conclusions:

  • U1 telescripting is a gene-size-dependent mRNA regulation mechanism.
  • Gene size and function are polarized, with large genes involved in development and small genes in rapid responses.
  • Intron expansion in metazoan evolution likely enhanced this size-function stratification, enabling dynamic shifts in gene expression priorities.