Abstract:
BACKGROUND:Recurrent gene duplication and retention played an important role in angiosperm genome evolution. It has been hypothesized that these processes contribute significantly to plant adaptation but so far this hypothesis has not been tested at the genome scale. RESULTS:We studied available sequenced angiosperm genomes to assess the frequency of positive selection footprints in lineage specific expanded (LSE) gene families compared to single-copy genes using a dN/dS-based test in a phylogenetic framework. We found 5.38% of alignments in LSE genes with codons under positive selection. In contrast, we found no evidence for codons under positive selection in the single-copy reference set. An analysis at the branch level shows that purifying selection acted more strongly on single-copy genes than on LSE gene clusters. Moreover we detect significantly more branches indicating evolution under positive selection and/or relaxed constraint in LSE genes than in single-copy genes. CONCLUSIONS:In this - to our knowledge -first genome-scale study we provide strong empirical support for the hypothesis that LSE genes fuel adaptation in angiosperms. Our conservative approach for detecting selection footprints as well as our results can be of interest for further studies on (plant) gene family evolution.
journal_name
BMC Plant Bioljournal_title
BMC plant biologyauthors
Fischer I,Dainat J,Ranwez V,Glémin S,Dufayard JF,Chantret Ndoi
10.1186/1471-2229-14-151subject
Has Abstractpub_date
2014-05-31 00:00:00pages
151issn
1471-2229pii
1471-2229-14-151journal_volume
14pub_type
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