Journal
TRENDS IN PLANT SCIENCE
Volume 17, Issue 4, Pages 204-212Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tplants.2012.01.006
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Funding
- National Science Foundation [IOS-1052262, DEB-0845413]
- Howard Hughes Medical Institute
- Direct For Biological Sciences
- Division Of Environmental Biology [0844820] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1052262] Funding Source: National Science Foundation
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Arabidopsis thaliana is now a model system, not just for plant biology but also for comparative genomics. The completion of the sequences of two closely related species, Arabidopsis lyrata and Brassica rapa, is complemented by genomic comparisons among A. thaliana accessions and mutation accumulation lines. Together these genomic data document the birth of new genes via gene duplication, transposon exaptation and de novo formation of new genes from noncoding sequence. Most novel loci exhibit low expression, and are undergoing pseudogenization or subfunctionalization. Comparatively, A. thaliana has lost large amounts of sequence through deletion, particularly of transposable elements. Intraspecific genomic variation indicates high rates of deletion mutations and deletion polymorphisms across accessions, shedding light on the history of Arabidopsis genome architecture.
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