Low CO(2) Responsive Gene Co-Expression Network Identifies Regulators Facilitating Photosynthetic Growth of Synechocystis sp. Strain PCC 6803.

A gene co-expression network revealed that overexpression of slr6040 or sll5097 enhances photosynthetic growth of Synechocystis sp. PCC 6803 under low CO2 conditions, with up to a significant increase in CCM gene expression.

• Why it matters: Understanding regulators of photosynthesis and carbon concentration mechanisms in cyanobacteria is crucial for improving CO2 fixation and biotechnological applications, yet few transcription factors have been identified compared to higher plants.
• What they did: Researchers constructed a gene co-expression network from transcriptome data under varying CO2 levels, identifying new CO2-responsive regulators, and validated their roles through functional assays and gene expression analysis.
• The result: Overexpressing slr6040 or sll5097 promotes photosynthetic growth and upregulates CCM-related genes, providing a resource for engineering cyanobacteria with enhanced CO2 assimilation and productivity.