IFG, a gypsy-like retrotransposon in Pinus (Pinaceae), has an extensive history in pines

IFG, a gypsy-like retrotransposon in Pinus (Pinaceae), has an extensive history in pines A 1 kb EcoRI restriction fragment cloned from a band visible in an agarose gel of Pinus lambertiana (sugar pine) genomic DNA is present in both subgenera of Pinus with at least 104 copies/genome. A full-length copy of this repeated element recovered from a P. radiata (Monterey pine) genomic DNA library was found to possess all of the sequence features associated with gypsy-like retrotransposons. This report describes the biology and history of the IFG (Institute of Forest Genetics) family of retrotransposons. The characterized IFG7 is 5937 bp long. Immediately interior to its 5′ and 3′ long terminal repeats are sequences consistent with primer binding sites for reverse transcription of the RNA genome. Presumptive gene products associated with retrotransposition appear to be coded in a single reading frame and are in the same order as the gypsy-like retrotransposons and retroviruses. The 1.0 kb EcoRI fragment of IFG elements codes for the 3′ half of IFG's reverse transcriptase and the entire RNase H domain. Southern blot analysis suggests IFG was present in Pinaceae before its division into its modern genera. Sequence analysis of IFG 1.0 kb RI fragments and southern analysis also suggest that IFG continued to evolve in Pinus with restriction fragment length polymorphism (RFLP) subfamilies appearing early in the history of each subgenus often correlating with subdivisions of Pinus. Features shared with other plant retrotransposons are also discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

IFG, a gypsy-like retrotransposon in Pinus (Pinaceae), has an extensive history in pines

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Kluwer Academic Publishers
Copyright © 1999 by Kluwer Academic Publishers
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
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