|
1
|
Lim DKY, Schuhmann H, Thomas-Hall SR, Chan KCK, Wass TJ, Aguilera F, Adarme-Vega TC, Dal'Molin CGO, Thorpe GJ, Batley J, Edwards D, Schenk PM. RNA-Seq and metabolic flux analysis of Tetraselmis sp. M8 during nitrogen starvation reveals a two-stage lipid accumulation mechanism. Bioresour Technol 2017; 244:1281-1293. [PMID: 28625352 DOI: 10.1016/j.biortech.2017.06.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/31/2017] [Accepted: 06/01/2017] [Indexed: 05/18/2023]
Abstract
To map out key lipid-related pathways that lead to rapid triacylglyceride accumulation in oleaginous microalgae, RNA-Seq was performed with Tetraselmis sp. M8 at 24h after exhaustion of exogenous nitrogen to reveal molecular changes during early stationary phase. Further gene expression profiling by quantitative real-time PCR at 16-72h revealed a distinct shift in expression of the fatty acid/triacylglyceride biosynthesis and β-oxidation pathways, when cells transitioned from log-phase into early-stationary and stationary phase. Metabolic reconstruction modeling combined with real-time PCR and RNA-Seq gene expression data indicates that the increased lipid accumulation is a result of a decrease in lipid catabolism during the early-stationary phase combined with increased metabolic fluxes in lipid biosynthesis during the stationary phase. During these two stages, Tetraselmis shifts from reduced lipid consumption to active lipid production. This process appears to be independent from DGAT expression, a key gene for lipid accumulation in microalgae.
Collapse
Affiliation(s)
- David K Y Lim
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane 4072, Australia
| | - Holger Schuhmann
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane 4072, Australia
| | - Skye R Thomas-Hall
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane 4072, Australia
| | - Kenneth C K Chan
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane 4072, Australia; School of Plant Biology, The University of Western Australia, Perth 6009, Australia
| | - Taylor J Wass
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane 4072, Australia
| | - Felipe Aguilera
- School of Biological Sciences, The University of Queensland, Brisbane 4072, Australia
| | - T Catalina Adarme-Vega
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane 4072, Australia
| | - Cristiana G O Dal'Molin
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane 4072, Australia
| | - Glen J Thorpe
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane 4072, Australia
| | - Jacqueline Batley
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane 4072, Australia; School of Plant Biology, The University of Western Australia, Perth 6009, Australia
| | - David Edwards
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane 4072, Australia; School of Plant Biology, The University of Western Australia, Perth 6009, Australia
| | - Peer M Schenk
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane 4072, Australia.
| |
Collapse
|
|
2
|
Thorpe GJ. The U.K.: ready, willing, and able. J Palliat Care 1988; 4:26-8. [PMID: 2459346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
|
4
|
Abstract
A congestive cardiomyopathy, known locally as heart muscle disease, accounts for 32% of the cases of cardiovascular disease seen at University College Hospital, Ibadan, Nigeria.
Following a brief outline of the clinical picture and necropsy findings, the radiological features of the disease are described. Thirty-four cases were studied, and angiography was performed in 13. In the acute stage of the disease there was a generalized, globular, cardiac enlargement, and cardiac movements, especially of the left border of the heart, were reduced. Pulmonary venous congestion was invariably present and pleural effusions occurred frequently. Ventricular angiography demonstrated an enlarged chamber with little change in size and shape throughout the cardiac cycle, and persistence of contrast. Mitral incompetence was present in some cases. The value of angiography in differential diagnosis in emphasized.
Collapse
|
|
5
|
Thorpe GJ. Anuria following intravenous iron-dextran complex. Br J Clin Pract 1965; 19:703. [PMID: 5857544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|