Genome-Wide Identification and Evolutionary and Expression Analyses of the Cyclin B Gene Family in <i>Brassica napus</i>
2024
Mingyue Li | Minghao Zhang | Boyu Meng | Likai Miao | Yonghai Fan
Cyclin B (CYCB) is a regulatory subunit of cyclin-dependent kinase (CDK), the concentration of which fluctuates to regulate cell cycle progression. Extensive studies have been performed on cyclins in numerous species, yet the evolutionary relationships and biological functions of the <i>CYCB</i> family genes in <i>Brassica napus</i> remain unclear. In this study, we identified 299 <i>CYCB</i> genes in 11 <i>B</i>. <i>napus</i> accessions. Phylogenetic analysis suggests that <i>CYCB</i> genes could be divided into three subfamilies in angiosperms and that the <i>CYCB3</i> subfamily members may be a newer group that evolved in eudicots. The expansion of <i>BnaCYCB</i> genes underwent segmental duplication and purifying selection in genomes, and a number of drought-responsive and light-responsive <i>cis</i>-elements were found in their promoter regions. Additionally, expression analysis revealed that <i>BnaCYCBs</i> were strongly expressed in the developing seed and silique pericarp, as confirmed by the obviously reduced seed size of the mutant <i>cycb3;1</i> in <i>Arabidopsis thaliana</i> compared with Col-0. This study provides a comprehensive evolutionary analysis of <i>CYCB</i> genes as well as insight into the biological function of <i>CYCB</i> genes in <i>B</i>. <i>napus</i>.
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