Abstract
A new transposable element of tobacco, Slide, was isolated from thetl mutant line, which shows somatic instability, after its transposition into a locus encoding nitrate reductase (NR). The Slide-124 element is 3733 bp long and its coding sequences show similarities with conserved domains of the transposases ofAc, Tam3 andhobo. Excision from the NR locus is detectable in somatic leaf tissues and Slide mobility is triggered by in vitro tissue culture. Slide excision events create footprints similar to those left byAc and Tam3. Tobacco lines derived from thetl mutant line seem characterized by unmethylated copies of a few members of the highly repetitive Slide family. Slide mobility was monitored in transient expression assays. In wild-type tobacco protoplasts, the complete Slide element, as well as a defective copy, is able to excise. The complete Slide element, but not the defective version, is able to excise in protoplasts of the heterologous species lettuce (Lactuca sativa). These results show that Slide carries the functions required for its own mobility, and represents the first autonomousAc-like element characterized inSolanaceae species.
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Grappin, P., Audeon, C., Chupeau, M.C. et al. Molecular and functional characterization of Slide, anAc-like autonomous transposable element from tobacco. Molec. Gen. Genet. 252, 386–397 (1996). https://doi.org/10.1007/BF02173003
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DOI: https://doi.org/10.1007/BF02173003