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Succession of splicing regulatory elements determines cryptic 5΄ss functionality.

Anna-Lena Brillen1, Katrin Schöneweis2, Lara Walotka1

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Summary
This summary is machine-generated.

Cis-acting splicing regulatory elements (SREs) guide splice donor (5’ss) selection by U1 snRNA. SREs act like a relay race, suppressing incorrect 5’ss and ensuring accurate exon definition and 3’ exon end determination.

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Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Biology

Background:

  • Accurate exon definition is crucial for gene expression, relying on splice donor (5’ss) recognition by U1 snRNA.
  • Cis-acting splicing regulatory elements (SREs) play a vital role in selecting the correct 5’ss among potential sites.

Purpose of the Study:

  • To investigate the mechanism of cryptic 5’ss selection within the human fibrinogen Bβ-chain gene (FGB) exon 7.
  • To elucidate the role of exonic SREs in modulating 5’ss selection and 3’ exon end definition.

Main Methods:

  • Utilized a model system involving cryptic 5’ss selection in FGB exon 7.
  • Analyzed RNA-Seq data from 19 genes with competing 5’ss.
  • Performed extensive SRE analysis using various algorithms.

Main Results:

  • Identified exonic SREs that act on both upstream and downstream cryptic 5’ss in the FGB exon 7 model.
  • Demonstrated an iterative process of 5’ss selection involving alternating U1 snRNA binding sites and SREs.
  • Found that authentic 5’ss are significantly more supported by SREs than silent U1 snRNA binding sites.

Conclusions:

  • SREs play a critical role in suppressing incorrect 5’ss and ensuring accurate 3’ exon end definition.
  • The findings support a generalized model for 5’ss selection and 3’ exon end definition based on SRE activity.