The pivotal role of omics technologies in the production of third and fourth generation biodiesel

Abstract

The transition toward sustainable energy sources has necessitated the exploration of advanced biofuels, with third- and fourth-generation biodiesel emerging as promising alternatives to fossil fuels. These biodiesel generations leverage microalgae and genetically engineered organisms as biofactories, offering superior lipid yields and enhanced carbon sequestration capabilities. The integration of omics technologies including genomics, transcriptomics, proteomics, and metabolomics, has revolutionized metabolic engineering by providing a comprehensive understanding of the molecular mechanisms governing lipid biosynthesis and accumulation. Genomic and transcriptomic studies have facilitated the identification of key genes and regulatory networks involved in fatty acid and triacylglycerol (TAG) synthesis, while proteomic analyses have elucidated enzyme functions and post-translational modifications that influence lipid metabolism. More recently, metabolomics has emerged as a pivotal tool in refining strain optimization strategies, uncovering metabolic fluxes and novel pathways that enhance lipid production in microalgae under diverse environmental conditions. Despite significant advancements, challenges such as the complexity of metabolic interactions, regulatory bottlenecks, and the absence of standardized metabolomic databases persist. This review critically examines the state-of-the-art multi-omics-enabled algal biofuel research, highlighting recent breakthroughs in metabolic engineering and strain optimization. Emphasis is placed on the integration of omics data to enhance lipid yield, stress resilience, and carbon conversion efficiency. By addressing current limitations and leveraging emerging tools in systems and synthetic biology, multi-omics approaches hold the potential to accelerate the development of industrially viable algal strains, ultimately bridging the gap between laboratory-scale innovation and commercial-scale biodiesel production.