Evolution and biodiversity of L1 retrotransposons in angiosperm genomes
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At present, only fragmentary data about the biodiversity and structural features of L1 retrotransposons of angiosperms related to individual elements from few genomes are available. There is no clear cladistic classification of transposable elements of this family. Structural data on elements from particular groups of angiosperm L1 retrotransposons are also scarce. For these reasons, a comprehensive structural and phylogenetic analysis of L1 retrotransposons in angiosperms has been undertaken. We have compiled information on 19 genomes of angiosperm species that was available in databases and discerned three clades of L1 elements on the base of the phylogeny of the conserved reverse transcriptase region and on their structural organization. It is demonstrated that the emergence of new protein types that form the ribonucleoprotein particles of the retrotransposons and the acquisition of RNH protein-encoding regions by several elements were crucial steps in the formation of new L1 retrotransposon types.
KeywordsL1 non-LTR retrotransposons angiosperms bioinformatic search molecular evolution
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