Plant Molecular Biology

, Volume 36, Issue 4, pp 573–583 | Cite as

U-richness is a defining feature of plant introns and may function as an intron recognition signal in maize

  • Christopher H. Ko
  • Volker Brendel
  • Rebecca D. Taylor
  • Virginia Walbot


Using a large set of plant gene sequences we compared individual introns to their flanking exons. Both Zea mays and Arabidopsis thaliana introns are U-rich but display no apparent bias for A. We identified fifteen 11-mer U-rich motifs as frequent elements of maize introns, and these are virtually absent from exons. By mutagenesis, we show that the single U-rich motif in the Bronze2 intron of maize plays a key role in intron processing in vivo.

intron processing base composition U-rich motif Zea mays 


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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Christopher H. Ko
    • 1
  • Volker Brendel
    • 2
  • Rebecca D. Taylor
    • 1
  • Virginia Walbot
    • 1
  1. 1.Department of Biological SciencesUSA
  2. 2.Department of MathematicsStanford UniversityStanfordUSA

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