Birth, death and subfunctionalization in the Arabidopsis genome

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 accumulatio...

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Bibliographic Details
Published in:Trends in plant science 2012-04, Vol.17 (4), p.204-212
Main Authors: Rutter, Matthew T, Cross, Katilyn V, Van Woert, Patrick A
Format: Article
Language:English
Subjects:
Animals
Arabidopsis - genetics
Arabidopsis lyrata
Arabidopsis thaliana
Biological and medical sciences
Brassica rapa
Chromosome Duplication
death
Fundamental and applied biological sciences. Psychology
gene duplication
genes
Genetic Loci
Genome, Plant
genomics
Humans
mutation
parturition
Phenotype
plant biology
Polymorphism, Genetic
transposons
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Summary: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.
ISSN:1360-1385
1878-4372
DOI:10.1016/j.tplants.2012.01.006