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DNA binding with one finger (DOF) proteins are plant-specific transcription factors that play roles in diverse plant functions. However, little is known about the DOF protein repertoire of the allopolyploid crop,  Brassica napus . This  in silico  study identified 117  Brassica napus Dof  genes ( BnaDofs ) and classified them into nine groups (A, B1, B2, C1, C2.1, C2.2, C3, D1, and D2), based on phylogenetic analysis. Most members belonging to a particular group displayed conserved gene structural organisation and protein motif distribution. Evolutionary analysis exemplified that the divergence of the  Brassica  genus from Arabidopsis, the whole-genome triplication event, and the hybridisation of  Brassica oleracea  and  Brassica rapa  to form  B. napus , followed by gene loss and rearrangements, led to the expansion and divergence of the  Dof  transcription factor (TF) gene family in  B. napus . So far, this is the largest number of  Dof  genes reported in a single eudicot species. Functional annotation of BnaDof proteins, cis-element analysis of their promoters, and transcriptomic analysis suggested potential roles in organ development, the transition from the vegetative to the reproductive stage, light responsiveness, phytohormone responsiveness, as well as potential regulatory roles in abiotic stress. Overall, our results provide a comprehensive understanding of the molecular structure, evolution, and possible functional roles of  Dof  genes in plant development and abiotic stress response.

Genome-Wide In Silico Identification and Comparative Analysis of Dof Gene Family in Brassica napus