Massive Horizontal Gene Transfer in Bdelloid Rotifers
@article{Gladyshev2008MassiveHG, title={Massive Horizontal Gene Transfer in Bdelloid Rotifers}, author={Eugene Gladyshev and Matthew Meselson and Irina R. Arkhipova}, journal={Science}, year={2008}, volume={320}, pages={1210 - 1213} }
Horizontal gene transfer in metazoans has been documented in only a few species and is usually associated with endosymbiosis or parasitism. [] Key Result Some of the foreign genes were defective, whereas others were intact and transcribed; some of the latter contained functional spliceosomal introns. One such gene, apparently of bacterial origin, was overexpressed in Escherichia coli and yielded an active enzyme. The capture and functional assimilation of exogenous genes may represent an important force in…
405 Citations
Horizontal gene transfer in bdelloid rotifers is ancient, ongoing and more frequent in species from desiccating habitats
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HGT is ongoing in bdelloids and has contributed to putative functional differences among species, and Variation among the authors' study species is consistent with the hypothesis that desiccating habitats promote HGT.
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It is argued that the transfer of genes between host and symbiont may occasionally be of great evolutionary importance, particularly in the evolution of the symbiotic interaction itself.
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The number of well-supported cases of transfer from both prokaryotes and eukaryotes, many with significant functional implications, is now expanding rapidly and major recent trends include the important role of HGT in adaptation to certain specialized niches and the highly variable impact of H GT in different lineages.
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Bdelloid rotifers express horizontally acquired genes on a scale unprecedented in animals, and foreign genes make a profound contribution to their metabolism, which represents a potential mechanism for ancient asexuals to adapt rapidly to changing environments and thereby persist over long evolutionary time periods in the absence of sex.
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The genome of a bdelloid rotifer, Adineta vaga, is reported and it is shown that its structure is incompatible with conventional meiosis, and abundant evidence of gene conversion is found, which may limit the accumulation of deleterious mutations in the absence of meiosis.
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