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Transposable elements and factors influencing their success in eukaryotes Pritham EJJ Hered 2009[Sep]; 100 (5): 648-55Recent advances in genome sequencing have led to a vast accumulation of transposable element data. Consideration of the genome sequencing projects in a phylogenetic context reveals that despite the hundreds of eukaryotic genomes that have been sequenced, a strong bias in sampling exists. There is a general under-representation of unicellular eukaryotes and a dearth of genome projects in many branches of the eukaryotic phylogeny. Among sequenced genomes, great variation in genome size exists, however, little difference in the total number of cellular genes is observed. For many eukaryotes, the remaining genomic space is extremely dynamic and predominantly composed of a menagerie of populations of transposable elements. Given the dynamic nature of the genomic niche filled by transposable elements, it is evident that these elements have played an important role in genome evolution. The contribution of transposable elements to genome architecture and to the advent of genetic novelty is likely to be dependent, at least in part, on the transposition mechanism, diversity, number, and rate of turnover of transposable elements in the genome at any given time. The focus of this review is the discussion of some of the forces that act to shape transposable element diversity within and between genomes.|*Genetic Variation[MESH]|Animals[MESH]|DNA Transposable Elements/*genetics[MESH]|Eukaryotic Cells/*physiology[MESH]|Evolution, Molecular[MESH]|Genome/*genetics[MESH] |
