Resources for targeted insertional and deletional mutagenesis in Arabidopsis

Resources for targeted insertional and deletional mutagenesis in Arabidopsis The maize transposons Activator (Ac) and Dissociation (Ds) are active in many monocots and dicots, including Arabidopsis. We describe a new Ac-derived transposon construct, designated the Ds-loxP T-DNA, which can be used for both insertional and deletional mutagenesis. There are loxP sites in both orientations on both the transposon and the donor site T-DNA and an arrangement of marker genes that permits selection of transposition events, as well as deletions and inversions extending from the donor site to a transposon reinserted on either side of it. We show that Cre-mediated deletions and inversions occur at a high frequency. The tendency of Ac-Ds transposons to reinsert near the donor site can be used to target both insertional and deletional mutagenesis, but efficient exploitation of this property requires a library of mapped marked donor sites distributed in the genome. We have created a population of independent Ds T-DNA transformants and we have mapped an initial set of 75 Ds T-DNA integration sites. We assessed the potential efficiency of targeted mutagenesis by detecting Ds reinsertion events at several loci over a 400 kb interval from each of two donor sites with different Ds T-DNA constructs. The distribution of reinsertion sites is similar around the two tested loci, with roughly 10, 4, and ca. 1% of reinsertions detected within 1–2 kb of sites 10, 100, and 200–400 kb from the donor site, respectively. To facilitate the use of this targeted mutagenesis system, we have constructed a searchable database of the mapped Ds T-DNA integration sites. Plant Molecular Biology Springer Journals

Resources for targeted insertional and deletional mutagenesis in Arabidopsis

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Kluwer Academic Publishers
Copyright © 2003 by Kluwer Academic Publishers
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
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