Transcriptional similarities, dissimilarities, and conservation of cis-elements in duplicated genes of Arabidopsis.
In plants, duplication of individual genes, long chromosomal regions, and complete genomes provides a major source for evolutionary innovation. We investigated two different types of duplications, tandem and segmental duplications, in Arabidopsis for correlation, conservation, and differences of expression characteristics by making use of large genome-wide expression data as measured by the massively parallel signature sequencing method. Our analysis indicates that large fractions of duplicated gene pairs still share transcriptional characteristics. However, our results also indicate that expression divergence occurs frequently between duplicated gene pairs, a process which frequently might be employed for the retention of sequence redundant gene pairs. Preserved overall similarity between promoters of duplicated genes as well as preservation of individual cis-elements within the respective promoters indicates that the process of transcriptional neo- and subfunctionalization is restricted to only a fraction of cis-elements. We show that sequence similarities and shared regulatory properties within duplicated promoters provide a powerful means to undertake large-scale cis-regulatory element identification by applying an intragenomic phylogenetic footprinting approach. Our work lays a foundation for future comparative studies to elucidate the molecular manifestation of regulatory similarities and dissimilarities of duplicated genes.
Munich Information Center for Protein Sequences, Institute for Bioinformatics, GSF Research Center for Environment and Health, 85758 Neuherberg, Germany.
Georg
G
Haberer
Tobias
T
Hindemitt
Blake C
BC
Meyers
Klaus F X
KF
Mayer
D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics; D017124:Conserved Sequence; D018983:DNA Footprinting; D020440:Gene Duplication; D018506:Gene Expression Regulation, Plant; D010802:Phylogeny; D011401:Promoter Regions, Genetic; D012045:Regulatory Sequences, Nucleic Acid; D014158:Transcription, Genetic
D029681:Arabidopsis Proteins