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Related Experiment Video

Updated: Jun 30, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Mutational analysis of the U12-dependent branch site consensus sequence.

Jay E Brock¹, Rosemary C Dietrich, Richard A Padgett

¹Department of Molecular Genetics, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.

RNA (New York, N.Y.)

|October 1, 2008

Summary

Mutations in the U12-dependent intron branch site significantly impair splicing. RNA base-pairing stability is crucial for accurate U12-dependent intron recognition and splice site selection.

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Area of Science:

Molecular Biology
Genetics
RNA Biology

Background:

U12-dependent introns are a small class of spliceosomes essential for specific gene expression.
Conserved sequences at the 5' splice and branch sites are critical for U12-dependent splicing.
The branch site sequence's role in U12-dependent intron recognition requires further investigation.

Purpose of the Study:

To investigate the in vivo splicing phenotypes of mutations in the U12-dependent intron branch site consensus sequence.
To determine the impact of branch site sequence alterations on U12-dependent splicing efficiency and accuracy.
To correlate branch site sequence mutations with thermodynamic stability of RNA-RNA interactions.

Main Methods:

Site-directed mutagenesis of the U12-dependent intron F branch site in a human NOL1 minigene.
In vivo splicing analysis to assess splicing efficiency and accuracy.
Evaluation of RNA secondary structure stability and RNA:RNA interactions.

Main Results:

Mutations at most branch site positions significantly reduced correct U12-dependent splicing.
Splicing defects included increased unspliced RNA and activation of cryptic splice sites (U2- and U12-dependent).
A strong correlation exists between predicted branch site:U12 snRNA interaction stability and correct splicing.

Conclusions:

The U12-dependent intron branch site sequence is vital for accurate spliceosome assembly and function.
RNA/RNA base-pairing interactions, rather than a polypyrimidine tract, are key for U12-dependent intron recognition.
Understanding these interactions is crucial for splice site selection in U12-dependent splicing pathways.