Comparative analysis of gene regulatory networks identifies conserved regulators in seed plants

Gene regulatory networks based on transcription factors control development and environmental responses in plants. Networks calculated by the machine learning algorithm random forest decision tree-based regression for the grasses barley, maize, wheat, Brachypodium, sorghum, and rice compared with Arabidopsis and an alga show substantial conservation. The degree of conservation depends on phylogenetic closeness. The processes, which are conserved between all species include basic cellular functions while the processes conserved in the grasses also more specific gene ontology terms. In the three species with a carbon concentration mechanism, photorespiration is partially disassociated from photosynthetic regulation. In contrast, in the C4 species, the regulation of C4 genes associates with photosynthetic regulation. The comparative analyses reveal conserved transcription factors, which control photosynthesis in seed plants but not in the alga. An analysis pipeline for the general transfer of information between the small weed Arabidopsis and the commercially relevant grasses is presented.