Nonautonomous Long Terminal Repeat Retrotransposons in Plants: Progress and Perspective

Abstract Long terminal repeat retrotransposons (LTR-RTs), the major genomic components in plants, can be classified into autonomous and nonautonomous elements based on their internal structures and retrotranspositional properties. Large numbers of nonautonomous elements have been identified, but the factors, and mechanisms that govern their retrotranspositional processes are poorly understood. Here we summarize the recent advance of LTR-RTs in plants, and discuss how nonautonomous LTR-RTs were generated, proliferated and evolved in their host genomes, with an emphasis on the discussion of the partnership and interaction between nonautonomous elements and their autonomous partners. Thus this review will provide insights into the evolution of nonautonomous LTR-RTs, and facilitate our full understanding of the retrotranspositional process of LTR-RTs in plants.

Keywords Retrotansposons, long terminal repeats, evolution, plants.

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