Co-evolution of plant LTR-retrotransposons and their host genomes

查看全文 作　　者：Meixia [1]Zhao;Jianxin [1,2]Ma

机构地区：[1]Department of Agronomy,Purdue University,West Lafayette,IN 47907,USA;[2]College of Life Sciences,Qingdao Agricultural University,Qingdao 266109,China

出　　处：《Protein & Cell》索引2013年第4卷第7期,共9页

摘　　要：Transposable elements(TEs),particularly,long terminal repeat retrotransposons(LTR-RTs),are the most abun-dant DNA components in all plant species that have been investigated,and are largely responsible for plant genome size variation.Although plant genomes have experi-enced periodic proliferation and/or recent burst of LTR-retrotransposons,the majority of LTR-RTs are inactivated by DNA methylation and small RNA-mediated silencing mechanisms,and/or were deleted/truncated by unequal homologous recombination and illegitimate recombina-tion,as suppression mechanisms that counteract genome expansion caused by LTR-RT amplifi cation.LTR-RT DNA is generally enriched in pericentromeric regions of the host genomes,which appears to be the outcomes of pref-erential insertions of LTR-RTs in these regions and low effectiveness of selection that purges LTR-RT DNA from these regions relative to chromosomal arms.Potential functions of various TEs in their host genomes remain blurry;nevertheless,LTR-RTs have been recognized to play important roles in maintaining chromatin structures and centromere functions and regulation of gene expres-sions in their host genomes. 关键词：LTR-retrotransposons recombination evolu-tion epigenetic regulation PLANTS

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Co-evolution of plant LTR-retrotransposons and their host genomes

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