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Conserved role for spliceosomal component PRPF40A in microexon splicing.

Bikash Choudhary1, Adam Norris2

  • 1University of California, Riverside. Department of Biochemistry.

Biorxiv : the Preprint Server for Biology
|October 10, 2024
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Summary

The spliceosome component PRPF40A is crucial for splicing microexons in mouse neurons, working with SRRM4. This protein also regulates its own splicing, demonstrating cross-regulation within the spliceosome.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Neuroscience

Background:

  • Microexons are critical for neuronal transcriptome complexity but present splicing challenges.
  • PRP-40, a U1 spliceosome component, was previously found essential for microexon splicing in C. elegans.

Purpose of the Study:

  • To investigate the role of the homologous PRPF40A in microexon splicing in mouse neuroblastoma cells.
  • To understand the relationship between PRPF40A, SRRM4, and microexon splicing.
  • To explore the impact of PRPF40A knockdown on its binding partners' splicing.

Main Methods:

  • Utilized mouse neuroblastoma cells for experimental analysis.
  • Investigated the co-regulation of microexons by PRPF40A and SRRM4.
  • Analyzed the impact of PRPF40A knockdown on splicing patterns, including poison exon skipping.

Main Results:

  • PRPF40A is globally required for microexon splicing in mouse neuroblastoma cells.
  • PRPF40A co-regulates microexons with SRRM4, showing distinct size-dependent relationships.
  • PRPF40A knockdown leads to increased productive splicing of Luc7l via poison exon skipping.

Conclusions:

  • PRPF40A plays a vital role in neuronal microexon splicing, similar to its C. elegans homolog.
  • Functional and physical coupling exists between spliceosomal components, extending the concept of cross-regulation.
  • This study highlights conserved mechanisms in spliceosome function across evolution.