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Using the E1A Minigene Tool to Study mRNA Splicing Changes
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Modeling splicing outcome by combining 5'ss strength and splicing regulatory elements.

Lisa Müller1, Johannes Ptok1, Azlan Nisar1,2

  • 1Institute of Virology, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf 40225, Germany.

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Summary

We designed novel sequences to precisely control pre-mRNA splicing. Experimental validation confirmed their effectiveness, leading to improved splice site recognition and potential applications in genetic mutation assessment.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Bioinformatics

Background:

  • Accurate pre-mRNA splicing in eukaryotes relies on splice site recognition.
  • Splicing regulatory elements (SREs) are crucial for splice site recognition beyond conserved motifs.
  • Understanding SREs' impact is vital for deciphering gene expression and disease mechanisms.

Purpose of the Study:

  • To design and validate in silico sequences with predictable splicing regulatory properties.
  • To develop a unified framework for 'functional splice site strength' considering U1 snRNA complementarity and SREs.
  • To improve the prediction of 5' splice site (5'ss) usage and distinguish functional sites from cryptic ones.

Main Methods:

  • In silico design of splicing regulatory sequences with specific HEXplorer properties.
  • Massively parallel splicing reporter assays for experimental validation of designed sequences.
  • RNA-sequencing (RNA-seq) analysis to create a 5'ss usage landscape.
  • Development of a logistic regression model for 5'ss usage prediction.

Main Results:

  • Successfully designed and validated in silico sequences with controllable splicing regulatory functions.
  • Identified SRE binding proteins associated with the designed sequences.
  • Developed a novel RNA-seq based 5'ss usage landscape integrating HBond and HEXplorer scores.
  • Achieved improved discrimination between strong unused exonic GT sites and annotated 5'ss using a predictive model.

Conclusions:

  • The developed in silico sequences offer precise control over splicing regulation.
  • The 5'ss usage landscape provides a unified view of 5'ss and SRE neighborhood impacts.
  • This work enhances understanding of splice site recognition and has potential for improved mutation assessment in human genetics.