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The human branchpoint-interacting stem-loop sequence and structure regulates U2 snRNA expression, branchpoint

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Altering the U2 snRNA branchpoint-interacting stem loop (BSL) impacts splicing and gene expression in human cells. Mutations suggest a shared mechanism linking splicing changes to oncogenic pathways.

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Genetics

Background:

  • Pre-mRNA splicing is crucial for gene expression, involving spliceosome assembly initiated by U2 snRNP binding to introns.
  • The U2 snRNA branchpoint-interacting stem loop (BSL) is mutually exclusive with the functional branch helix.
  • While BSL alterations affect yeast splicing, their role in human cells remains unclear due to more flexible branchpoint usage.

Purpose of the Study:

  • To investigate the functional role of the U2 snRNA BSL in human cells.
  • To explore the impact of BSL mutations on U2 snRNA accumulation, splicing efficiency, and gene expression.
  • To elucidate the relationship between BSL stability, branchpoint recognition, and branch helix formation.

Main Methods:

  • Utilized a self-contained orthogonal splicing system with engineered U2 snRNA and splicing reporters in human cells.
  • Introduced specific BSL mutations to assess their effects on U2 snRNA levels and splicing.
  • Analyzed transcriptome-wide gene expression changes in response to BSL perturbations.

Main Results:

  • BSL mutations were found to significantly affect U2 snRNA accumulation and splicing efficiency in human cells.
  • Demonstrated a link between BSL stability, branchpoint sequence complementarity, and intron-mediated BSL stem unwinding.
  • Observed shared splicing and gene expression alterations between cancer-associated BSL mutants and branchpoint recognition mutants, suggesting a common cellular response.

Conclusions:

  • The U2 snRNA BSL plays a critical role in human splicing regulation.
  • Findings support and extend a toehold-mediated strand invasion model for branch helix formation.
  • Perturbations in BSL structure can lead to conserved cellular responses, including gene upregulation associated with oncogenic pathways.