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The Ecoresponsive Genome of Daphnia pulex
Journal article   Peer reviewed

The Ecoresponsive Genome of Daphnia pulex

John K Colbourne, Michael E Pfrender, Donald Gilbert, W. Kelley Thomas, Abraham Tucker, Todd H Oakley, Shinichi Tokishita, Andrea Aerts, Georg J Arnold, Malay Kumar Basu, …
Science (American Association for the Advancement of Science), Vol.331(6017), pp.555-561
02/04/2011
DOI: 10.1126/science.1197761
PMCID: PMC3529199
PMID: 21292972
url
https://www.osti.gov/biblio/1056554View
Open Access

Abstract

We describe the draft genome of the microcrustacean Daphnia pulex, which is only 200 megabases and contains at least 30,907 genes. The high gene count is a consequence of an elevated rate of gene duplication resulting in tandem gene clusters. More than a third of Daphnia’s genes have no detectable homologs in any other available proteome, and the most amplified gene families are specific to the Daphnia lineage. The coexpansion of gene families interacting within metabolic pathways suggests that the maintenance of duplicated genes is not random, and the analysis of gene expression under different environmental conditions reveals that numerous paralogs acquire divergent expression patterns soon after duplication. Daphnia-specific genes, including many additional loci within sequenced regions that are otherwise devoid of annotations, are the most responsive genes to ecological challenges.

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