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Background  WD40 proteins represent a large family in eukaryotes, which have been involved in a broad spectrum of crucial functions. Systematic characterization and co-expression analysis of  OsWD40  genes enable us to understand the networks of the WD40 proteins and their biological processes and gene functions in rice.    Results  In this study, we identify and analyze 200 potential  OsWD40  genes in rice, describing their gene structures, genome localizations, and evolutionary relationship of each member. Expression profiles covering the whole life cycle in rice has revealed that transcripts of  OsWD40  were accumulated differentially during vegetative and reproductive development and preferentially up or down-regulated in different tissues. Under phytohormone treatments, 25  OsWD40  genes were differentially expressed with treatments of one or more of the phytohormone NAA, KT, or GA3 in rice seedlings. We also used a combined analysis of expression correlation and Gene Ontology annotation to infer the biological role of the  OsWD40  genes in rice. The results suggested that  OsWD40  genes may perform their diverse functions by complex network, thus were predictive for understanding their biological pathways. The analysis also revealed that  OsWD40  genes might interact with each other to take part in metabolic pathways, suggesting a more complex feedback network.    Conclusions  All of these analyses suggest that the functions of  OsWD40  genes are diversified, which provide useful references for selecting candidate genes for further functional studies.

Genomic survey, expression profile and co-expression network analysis of OsWD40 family in rice