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Related Experiment Videos

Large exon size does not limit splicing in vivo

I T Chen1, L A Chasin

  • 1Department of Biological Sciences, Columbia University, New York, New York 10027.

Molecular and Cellular Biology
|March 1, 1994
PubMed
Summary

Vertebrate exon size limits are not due to exon definition. Experiments show that expanded exons, even up to 1,400 bases, can be efficiently spliced into messenger RNA.

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Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Splicing

Background:

  • Vertebrate exons typically measure under 300 bases.
  • This size limitation may stem from the exon definition model of splice site recognition.

Purpose of the Study:

  • To investigate if exon size limitations are inherent to the exon definition mechanism.
  • To test if proximity between splice sites is required for efficient splicing.

Main Methods:

  • Insertion of random DNA fragments from Escherichia coli into a central exon of a dihydrofolate reductase minigene.
  • Transfection of CHO cells with expanded minigene plasmids.
  • Polymerase Chain Reaction (PCR) analysis of DNA and RNA to assess exon splicing and size.

Main Results:

  • Central exons as large as 1,400 bases were successfully spliced into mRNA.
  • Individual clones with exon inserts up to 1,200 bases were included in mRNA.
  • The observed splicing efficiency contradicted the proposed 300-base exon size limit.

Conclusions:

  • Exon size limitation is not an intrinsic part of the exon definition mechanism.
  • The exon definition model does not necessitate close proximity between splice sites.
  • Splicing machinery can accommodate significantly larger exons than naturally observed.

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