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Gene
2007 Dec 30;4061-2:1-7. doi: 10.1016/j.gene.2007.04.031.
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A basal deuterostome genome viewed as a natural experiment.
Andrew Cameron R
,
Davidson EH
.
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With the determination of its genome sequence the utility of the sea urchin model system increases. The phylogenetic position of the sea urchin among the deuterostomes allows for informative comparisons to vertebrate research models. A combined whole genome shotgun and bacterial artificial chromosome based strategy yielded a high quality draft genome sequence of 814 Mb. The predicted gene set estimated to include 23,300 genes was annotated and compared to those of other metazoan animals. Gene family expansions in the innate immune system are large and offer a first glimpse of how the long-lived sea urchin defends itself. The gene sets of the sea urchin place it firmly among the deuterostomes and indicate that various gene family-specific expansions and contractions characterize the evolution of animal genomes rather than the invention of new genes.
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