Genetic jockers: Transposable elements in plants -A review

Transpoable elements and remnants thereof constitute a large fraction of the repetitive DNA of plant as well as animal genomes. They have been classified into class I and class II groups. Class I includes retrotransposons and other retroelements. Retroelements consists of LTRs such as Ty 1 -copia and Ty 3 -gypsy retroelements and non -LTRs, subdivided into LINEs (long interspersed nuclear elements) and SINEs (short interspersed nuclear elements). The retroelements have been discovered as ubiquitous components of nuclear genome in many species across the plant kingdom.