Abstract
The unicellular microalga Chlamydomonas reinhardtii exhibits immense metabolic flexibility, adjusting to changes in the environment and nutrient availability. One metabolic response under stress conditions is the synthesis of the neutral lipid triacylglycerol (TAG), accumulating as intracellular lipid droplets in the cytosol and chloroplast. With increased industrial interest in microalgal production of biofuels, feed, food, and chemicals, research on lipid metabolism using C. reinhardtii as a model system has accelerated in recent years. Conditions in which C. reinhardtii accumulates TAG have been identified, with nitrogen starvation as one of the most commonly used methods for induction. Genome, transcriptome, proteome, and lipidome analyses have provided information on the pathways involved in TAG synthesis and degradation. These studies have demonstrated that although a multitude of stress conditions induce TAG accumulation, there are differential response and regulatory mechanisms occurring under various induction conditions. Studies utilizing mutants have further led to the identification of pathways and regulatory components contributing to TAG synthesis and degradation. TAG metabolism is a multifaceted process in C. reinhardtii, and induction of TAG accumulation is accompanied by major reorganization of metabolic pathways, adjustments of photosynthetic complexes, membrane lipid recycling, and changes in carbon partitioning.
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I am grateful to Dr. Xiaobo Li for critical feedback and suggestions on the manuscript.
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Terashima, M. (2017). Chlamydomonas: Triacylglycerol Accumulation. In: Hippler, M. (eds) Chlamydomonas: Biotechnology and Biomedicine. Microbiology Monographs, vol 31. Springer, Cham. https://doi.org/10.1007/978-3-319-66360-9_8
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