Expansion of the circadian transcriptome in Brassica rapa and genome-wide diversification of paralog expression patterns.

ABSTRACT: An important challenge of crop improvement strategies is assigning function to paralogs in polyploid crops. Here we describe the circadian transcriptome in the polyploid crop Brassica rapa. Strikingly, almost three-quarters of the expressed genes exhibited circadian rhythmicity. Genetic redundancy resulting from whole genome duplication is thought to facilitate evolutionary change through sub- and neo-functionalization among paralogous gene pairs. We observed genome-wide expansion of the circadian expression phase among retained paralogous pairs. Using gene regulatory network models, we compared transcription factor targets between B. rapa and Arabidopsis circadian networks to reveal evidence for divergence between B. rapa paralogs that may be driven in part by variati

SUBMITTER: Greenham K 

PROVIDER: S-EPMC7655105 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature