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- W2080331377 abstract "As part of the analysis of the Arabidopsis mutant iae1-1 (increased Ac excision), quantitative studies of the Ac transposase transcript were conducted. The primary transcript of Ac contains three small introns (introns 1–3; mean size 89 bp) and one larger intron (intron 4; 387 bp). We analysed the splicing of intron 3 and intron 4 in wild-type Arabidopsis and the iae1-1 mutant. Our results demonstrate that the splicing of Ac introns 3 and 4 is inefficient (splicing efficiencies 57 and 30% respectively) compared with that of an intron of an endogenous Arabidopsis gene (PHYB intron 1; splicing efficiency 90%). The poor splicing efficiency of Ac intron 4 was found to correlate with aberrant processing. Steady state levels of total Ac transcript were higher in the iae1-1 mutant than wild-type, but the same aberrant processing occurred. The inefficient processing of Ac in Arabidopsis prompted us to construct an Ac element lacking introns (Ac::cDNA) in an attempt to increase transposition frequencies. Autonomous activity of the Ac::cDNA element was undetectable in Arabidopsis, despite its ability to transpose at high frequency in response to a strong transposase source (35S::transposase) in trans, and the demonstrable autonomy of the same element in tobacco. A number of smaller transcripts were detected in Arabidopsis lines containing Ac::cDNA or Ac. Analysis of these smaller transcripts revealed a high frequency of premature polyadenylation in exon 2 and splicing of cryptic introns." @default.
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- W2080331377 date "1997-05-01" @default.
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- W2080331377 title "Inefficient and incorrect processing of the Ac transposase transcript in iae1 and wild-type Arabidopsis thaliana" @default.
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- W2080331377 doi "https://doi.org/10.1046/j.1365-313x.1997.11050921.x" @default.
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