Genome-wide analysis of the emigrant family of MITEs: amplification dynamics and evolution of genes in Arabidopsis thaliana
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MITEs are structurally similar to defective class II elements but their high copy number and the size and sequence conservation of most MITE families suggest that they can be amplified by a replicative mechanism. Here we present a genome-wide analysis of the Emigrant family of MITEs from Arabidopsis thaliana. In order to be able to detect divergent ancient copies and low copy number subfamilies with a different internal sequence we have developed a computer program (http://www.lsi.upc.es/~alggen) that allows looking for Emigrant elements based solely on its TIR sequence. Our results show that different bursts of amplification of one or very few active, or master, elements have occurred at different times during Arabidopsis evolution, with an insertion dynamics similar to that of some SINEs. The analysis of the insertion sites of the Emigrant elements show that, although Emigrant elements tend to integrate far from ORFs, the elements inserted within or close to genes are preferentially maintained during evolution.
CitacióSantiago, N., Herráiz, C., Messeguer, X., Goñi, R., Casacuberta, J. "Genome-wide analysis of the emigrant family of MITEs: amplification dynamics and evolution of genes in Arabidopsis thaliana". 2002.