Cited by 511Algal biology and biofuel productionLipid metabolism and biosynthesisMicrobial Metabolic Engineering and Bioproduction

Changes in Transcript Abundance in Chlamydomonas reinhardtii following Nitrogen Deprivation Predict Diversion of Metabolism

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Miller, Rachel, Wu, Guangxi, Deshpande, Rahul R., Vieler, Astrid, Gärtner, Katrin, Li, Xiaobo, Moellering, Eric R., Zäuner, Simone +9 more·2010·PLANT PHYSIOLOGY

Abstract

Like many microalgae, Chlamydomonas reinhardtii forms lipid droplets rich in triacylglycerols when nutrient deprived. To begin studying the mechanisms underlying this process, nitrogen (N) deprivation was used to induce triacylglycerol accumulation and changes in developmental programs such as gametogenesis. Comparative global analysis of transcripts under induced and noninduced conditions was applied as a first approach to studying molecular changes that promote or accompany triacylglycerol accumulation in cells encountering a new nutrient environment. Towards this goal, high-throughput sequencing technology was employed to generate large numbers of expressed sequence tags of eight biologically independent libraries, four for each condition, N replete and N deprived, allowing a statistically sound comparison of expression levels under the two tested conditions. As expected, N deprivation activated a subset of control genes involved in gametogenesis while down-regulating protein biosynthesis. Genes for components of photosynthesis were also down-regulated, with the exception of the PSBS gene. N deprivation led to a marked redirection of metabolism: the primary carbon source, acetate, was no longer converted to cell building blocks by the glyoxylate cycle and gluconeogenesis but funneled directly into fatty acid biosynthesis. Additional fatty acids may be produced by membrane remodeling, a process that is suggested by the changes observed in transcript abundance of putative lipase genes. Inferences on metabolism based on transcriptional analysis are indirect, but biochemical experiments supported some of these deductions. The data provided here represent a rich source for the exploration of the mechanism of oil accumulation in microalgae.

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Crossref · 10.1104/pp.110.165159

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  • Different responses of the TCA cycle in C. reinhardtii and T. pseudonana to nitrogen starvation have been observed, showing that the flux of the TCA cycle may be adaptable.

    “Different responses of the TCA cycle in C. reinhardtii and T. pseudonana to nitrogen starvation have been observed (Miller et al., 2010;Hockin et al., 2012), showing that the flux of the TCA cycle may be adaptable.”

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Authors
Miller, R., Wu, G., Deshpande, R. R., Vieler, A., Gärtner, K., Li, X., Moellering, E. R., Zäuner, S., Cornish, A. J., Liu, B., Bullard, B., Sears, B. B., Kuo, M.-H., Hegg, E. L., Shachar-Hill, Y., Shiu, S.-H., & Benning, C.
Affiliations
Cell and Molecular Biology Program (R.M., G.W.), Department of Energy-Plant Research Laboratory (R.M., X.L., E.R.M.), Department of Plant Biology (R.R.D., X.L., B.B.S., Y.S.-H., S.-H.S.), and Department of Biochemistry and Molecular Biology (A.V., K.G., E.R.M., S.Z., A.J.C., B.L., B.B., M.-H.K., E.L.H., C.B.), Michigan State University, East Lansing, Michigan 48824
Venue
PLANT PHYSIOLOGY
Published
2010-10-08
Volume
154
Issue
4
Pages
1737-1752
ISSN
  • 0032-0889 (ISSN-L)
  • 1532-2548
OpenAlex
W2120780572
Cited by
511
References
76
Citations by year
2026: 10 · 2025: 13 · 2024: 21 · 2023: 15 · 2022: 28 · 2021: 30 · 2020: 27 · 2019: 40 · 2018: 36 · 2017: 41 · 2016: 54 · 2015: 48 · 2014: 41 · 2013: 51 · 2012: 33
FWCI
15.86
Type
journal article
Language
en
Open access
Locations
  • PLANT PHYSIOLOGY (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Joint Genome Institute
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
Keywords
Chlamydomonas reinhardtii, nitrogen starvation, triglyceride accumulation, lipid droplets, mRNA levels, gene expression profiling, gametogenesis, fatty acid synthesis, acetate metabolism, glyoxylate cycle, gluconeogenesis, membrane remodeling, lipase gene, photosynthesis genes
MeSH terms
Base Sequence, Gas Chromatography-Mass Spectrometry, Nitrogen, Photosynthesis, RNA, Messenger, Transcription Factors, Blotting, Northern, Gene Expression, Chlamydomonas reinhardtii, DNA Primers, Reverse Transcriptase Polymerase Chain Reaction, Lipid Metabolism

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