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Related Experiment Videos

Sequence-specific affinity selection of mammalian splicing complexes.

U Ryder1, B S Sproat, A I Lamond

  • 1European Molecular Biology Laboratory, Heidelberg, FRG.

Nucleic Acids Research
|December 25, 1990
PubMed
Summary

Antisense oligonucleotides precisely bind pre-mRNA, enabling the selection of splicing complexes. This method reveals dynamic pre-mRNA accessibility and the limited participation of small nuclear ribonucleoproteins (snRNPs) in spliceosome assembly.

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Gene Regulation

Background:

  • Splicing is a critical process in gene expression.
  • Understanding spliceosome dynamics is essential for deciphering gene regulation.

Purpose of the Study:

  • To investigate the utility of 2'-OMe RNA antisense oligonucleotides for affinity selection of spliceosomes.
  • To analyze the accessibility of pre-mRNA during splicing.
  • To characterize the composition and dynamics of spliceosomal complexes.

Main Methods:

  • Affinity selection using streptavidin/biotin chromatography with 2'-OMe RNA antisense oligonucleotides.
  • Analysis of pre-mRNA sequence accessibility to probes.
  • Detection of snRNAs within selected complexes.

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  • Quantitative analysis of snRNP participation.

    • Main Results:

    • 2'-OMe RNA antisense oligonucleotides specifically bind pre-mRNA, allowing affinity selection of splicing complexes.
    • Probe binding position influences the type of splicing complex selected.
    • Pre-mRNA accessibility to probes varies during the splicing reaction.
    • U1, U2, U4, U5, and U6 snRNAs are present in selected mammalian splicing complexes.
    • Antisense oligonucleotides targeting snRNAs can inhibit snRNP binding.
    • Only a small fraction of snRNPs in HeLa nuclear extracts participate in spliceosome formation.

    Conclusions:

    • Antisense oligonucleotide-based affinity selection is a viable method for studying splicing complexes.
    • Spliceosome composition and dynamics are complex and involve dynamic interactions.
    • The limited participation of snRNPs suggests regulatory mechanisms controlling spliceosome assembly.