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Chatelain P, Blanchard C, Astier J, Klinguer A, Wendehenne D, Jeandroz S, Rosnoblet C. Reliable reference genes and abiotic stress marker genes in Klebsormidium nitens. Sci Rep 2022; 12:18988. [PMID: 36348043 PMCID: PMC9643330 DOI: 10.1038/s41598-022-23783-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 11/04/2022] [Indexed: 11/09/2022] Open
Abstract
Microalgae have recently emerged as a key research topic, especially as biological models. Among them, the green alga Klebsormidium nitens, thanks to its particular adaptation to environmental stresses, represents an interesting photosynthetic eukaryote for studying the transition stages leading to the colonization of terrestrial life. The tolerance to different stresses is manifested by changes in gene expression, which can be monitored by quantifying the amounts of transcripts by RT-qPCR. The identification of optimal reference genes for experiment normalization was therefore necessary. In this study, using four statistical algorithms followed by the RankAggreg package, we determined the best reference gene pairs suitable for normalizing RT-qPCR data in K. nitens in response to three abiotic stresses: high salinity, PEG-induced dehydration and heat shock. Based on these reference genes, we were able to identify marker genes in response to the three abiotic stresses in K. nitens.
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Affiliation(s)
- Pauline Chatelain
- grid.493090.70000 0004 4910 6615Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
| | - Cécile Blanchard
- grid.493090.70000 0004 4910 6615Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
| | - Jeremy Astier
- grid.493090.70000 0004 4910 6615Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
| | - Agnès Klinguer
- grid.493090.70000 0004 4910 6615Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
| | - David Wendehenne
- grid.493090.70000 0004 4910 6615Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
| | - Sylvain Jeandroz
- grid.493090.70000 0004 4910 6615Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
| | - Claire Rosnoblet
- grid.493090.70000 0004 4910 6615Agroécologie, CNRS, INRAE, Institut Agro, Université de Bourgogne, Université Bourgogne Franche-Comté, Dijon, France
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Lapina T, Statinov V, Puzanskiy R, Ermilova E. Arginine-Dependent Nitric Oxide Generation and S-Nitrosation in the Non-Photosynthetic Unicellular Alga Polytomella parva. Antioxidants (Basel) 2022; 11:antiox11050949. [PMID: 35624813 PMCID: PMC9138000 DOI: 10.3390/antiox11050949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 05/04/2022] [Accepted: 05/10/2022] [Indexed: 11/16/2022] Open
Abstract
Nitric oxide (NO) acts as a key signaling molecule in higher plants, regulating many physiological processes. Several photosynthetic algae from different lineages are also known to produce NO. However, it remains unclear whether this messenger is produced by non-photosynthetic algae. Among these organisms, the colorless alga Polytomella parva is a special case, as it has lost not only its plastid genome, but also nitrate reductase and nitrite reductase. Up to now, the question of whether NO synthesis occurs in the absence of functional nitrate reductase (NR) and the assimilation of nitrates/nitrites in P. parva has not been elucidated. Using spectrofluorometric assays and confocal microscopy with NO-sensitive fluorescence dye, we demonstrate L-arginine-dependent NO synthesis by P. parva cells. Based on a pharmacological approach, we propose the existence of arginine-dependent NO synthase-like activity in this non-photosynthetic alga. GC-MS analysis provides primary evidence that P. parva synthesizes putrescine, which is not an NO source in this alga. Moreover, the generated NO causes the S-nitrosation of protein cysteine thiol groups. Together, our data argue for NR-independent NO synthesis and its active role in S-nitrosation as an essential post-translational modification in P. parva.
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Affiliation(s)
- Tatiana Lapina
- Biological Faculty, Saint-Petersburg State University, 199034 Saint-Petersburg, Russia; (T.L.); (V.S.); (R.P.)
| | - Vladislav Statinov
- Biological Faculty, Saint-Petersburg State University, 199034 Saint-Petersburg, Russia; (T.L.); (V.S.); (R.P.)
| | - Roman Puzanskiy
- Biological Faculty, Saint-Petersburg State University, 199034 Saint-Petersburg, Russia; (T.L.); (V.S.); (R.P.)
- Komarov Botanical Institute of the Russian Academy of Sciences, 197376 Saint Petersburg, Russia
| | - Elena Ermilova
- Biological Faculty, Saint-Petersburg State University, 199034 Saint-Petersburg, Russia; (T.L.); (V.S.); (R.P.)
- Correspondence:
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