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Siodmak A, Martinez-Seidel F, Rayapuram N, Bazin J, Alhoraibi H, Gentry-Torfer D, Tabassum N, Sheikh AH, Kise J, Blilou I, Crespi M, Kopka J, Hirt H. Dynamics of ribosome composition and ribosomal protein phosphorylation in immune signaling in Arabidopsis thaliana. Nucleic Acids Res 2023; 51:11876-11892. [PMID: 37823590 PMCID: PMC10681734 DOI: 10.1093/nar/gkad827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 09/14/2023] [Accepted: 09/20/2023] [Indexed: 10/13/2023] Open
Abstract
In plants, the detection of microbe-associated molecular patterns (MAMPs) induces primary innate immunity by the activation of mitogen-activated protein kinases (MAPKs). We show here that the MAMP-activated MAPK MPK6 not only modulates defense through transcriptional regulation but also via the ribosomal protein translation machinery. To understand the effects of MPK6 on ribosomes and their constituent ribosomal proteins (RPs), polysomes, monosomes and the phosphorylation status of the RPs, MAMP-treated WT and mpk6 mutant plants were analysed. MAMP-activation induced rapid changes in RP composition of monosomes, polysomes and in the 60S ribosomal subunit in an MPK6-specific manner. Phosphoproteome analysis showed that MAMP-activation of MPK6 regulates the phosphorylation status of the P-stalk ribosomal proteins by phosphorylation of RPP0 and the concomitant dephosphorylation of RPP1 and RPP2. These events coincide with a significant decrease in the abundance of ribosome-bound RPP0s, RPP1s and RPP3s in polysomes. The P-stalk is essential in regulating protein translation by recruiting elongation factors. Accordingly, we found that RPP0C mutant plants are compromised in basal resistance to Pseudomonas syringae infection. These data suggest that MAMP-induced defense also involves MPK6-induced regulation of P-stalk proteins, highlighting a new role of ribosomal regulation in plant innate immunity.
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Affiliation(s)
- Anna Siodmak
- Center for Desert Agriculture, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Federico Martinez-Seidel
- Willmitzer Department, Max Planck-Institute of Molecular Plant Physiology, Potsdam, Germany
- School of Biosciences, The University of Melbourne, Parkville, VIC, Australia
| | - Naganand Rayapuram
- Center for Desert Agriculture, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Jeremie Bazin
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Univ Paris Sud, Univ Evry, Univ Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, Orsay, France
| | - Hanna Alhoraibi
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, 21551 Jeddah, Saudi Arabia
| | - Dione Gentry-Torfer
- Willmitzer Department, Max Planck-Institute of Molecular Plant Physiology, Potsdam, Germany
- School of Biosciences, The University of Melbourne, Parkville, VIC, Australia
| | - Naheed Tabassum
- Center for Desert Agriculture, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Arsheed H Sheikh
- Center for Desert Agriculture, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - José Kenyi González Kise
- Center for Desert Agriculture, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Ikram Blilou
- Center for Desert Agriculture, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Martin Crespi
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Univ Paris Sud, Univ Evry, Univ Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, Orsay, France
| | - Joachim Kopka
- Willmitzer Department, Max Planck-Institute of Molecular Plant Physiology, Potsdam, Germany
| | - Heribert Hirt
- Center for Desert Agriculture, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
- Max F. Perutz Laboratories, University of Vienna, Dr. Bohrgasse 9, 1030 Vienna, Austria
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Prall W, Sheikh AH, Bazin J, Bigeard J, Almeida-Trapp M, Crespi M, Hirt H, Gregory BD. Pathogen-induced m6A dynamics affect plant immunity. Plant Cell 2023; 35:4155-4172. [PMID: 37610247 PMCID: PMC10615206 DOI: 10.1093/plcell/koad224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 07/17/2023] [Accepted: 07/18/2023] [Indexed: 08/24/2023]
Abstract
Posttranscriptional regulation of mRNA mediated by methylation at the N6 position of adenine (N6-methyladenosine [m6A]) has profound effects on transcriptome regulation in plants. Focused studies across eukaryotes offer glimpses into the processes governed by m6A throughout developmental and disease states. However, we lack an understanding of the dynamics and the regulatory potential of m6A during biotic stress in plants. Here, we provide a comprehensive look into the effects of m6A on both the short-term and long-term responses to pathogen signaling in Arabidopsis (Arabidopsis thaliana). We demonstrate that m6A-deficient plants are more resistant to bacterial and fungal pathogen infections and have altered immune responses. Furthermore, m6A deposition is specifically coordinated on transcripts involved in defense and immunity prior to and proceeding the pathogen signal flagellin. Consequently, the dynamic modulation of m6A on specific stress-responsive transcripts is correlated with changes in abundance and cleavage of these transcripts. Overall, we show that the m6A methylome is regulated prior to and during simulated and active pathogen stress and functions in the coordination and balancing of normal growth and pathogen responses.
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Affiliation(s)
- Wil Prall
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104,USA
| | - Arsheed H Sheikh
- Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900,Saudi Arabia
| | - Jeremie Bazin
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Universite Paris Sud, Universite Evry, Universite Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, 91190 Gif-sur-Yvette,France
| | - Jean Bigeard
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Universite Paris Sud, Universite Evry, Universite Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, 91190 Gif-sur-Yvette,France
| | - Marilia Almeida-Trapp
- Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900,Saudi Arabia
| | - Martin Crespi
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Universite Paris Sud, Universite Evry, Universite Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, 91190 Gif-sur-Yvette,France
| | - Heribert Hirt
- Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900,Saudi Arabia
- Max F. Perutz Laboratories, University of Vienna, 1030 Vienna,Austria
| | - Brian D Gregory
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104,USA
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Butt H, Bazin J, Alshareef S, Eid A, Benhamed M, Reddy ASN, Crespi M, Mahfouz MM. Overlapping roles of spliceosomal components SF3B1 and PHF5A in rice splicing regulation. Commun Biol 2021; 4:529. [PMID: 33953336 PMCID: PMC8100303 DOI: 10.1038/s42003-021-02051-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 03/26/2021] [Indexed: 01/02/2023] Open
Abstract
The SF3B complex, a multiprotein component of the U2 snRNP of the spliceosome, plays a crucial role in recognizing branch point sequence and facilitates spliceosome assembly and activation. Several chemicals that bind SF3B1 and PHF5A subunits of the SF3B complex inhibit splicing. We recently generated a splicing inhibitor-resistant SF3B1 mutant named SF3B1GEX1ARESISTANT 4 (SGR4) using CRISPR-mediated directed evolution, whereas splicing inhibitor-resistant mutant of PHF5A (Overexpression-PHF5A GEX1A Resistance, OGR) was generated by expressing an engineered version PHF5A-Y36C. Global analysis of splicing in wild type and these two mutants revealed the role of SF3B1 and PHF5A in splicing regulation. This analysis uncovered a set of genes whose intron retention is regulated by both proteins. Further analysis of these retained introns revealed that they are shorter, have a higher GC content, and contain shorter and weaker polypyrimidine tracts. Furthermore, splicing inhibition increased seedlings sensitivity to salt stress, consistent with emerging roles of splicing regulation in stress responses. In summary, we uncovered the functions of two members of the plant branch point recognition complex. The novel strategies described here should be broadly applicable in elucidating functions of splicing regulators, especially in studying the functions of redundant paralogs in plants. Butt et al. used CRISPR-mediated directed evolution to generate rice mutants for the spliceosome components SF3B1 and PHF5A. They demonstrate that these mutants have different levels of sensitivity to salt treatments and suggest that the strategies they employed can be used in the future to study functions of redundant paralogs in plants.
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Affiliation(s)
- Haroon Butt
- Laboratory for Genome Engineering and Synthetic Biology, King Abdullah, University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Jeremie Bazin
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Univ Paris Sud, Univ Evry, Univ Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, Orsay, France
| | - Sahar Alshareef
- Laboratory for Genome Engineering and Synthetic Biology, King Abdullah, University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Ayman Eid
- Laboratory for Genome Engineering and Synthetic Biology, King Abdullah, University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Moussa Benhamed
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Univ Paris Sud, Univ Evry, Univ Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, Orsay, France
| | - Anireddy S N Reddy
- Department of Biology and Program in Cell and Molecular Biology, Colorado State University, Fort Collins, CO, USA
| | - Martin Crespi
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Univ Paris Sud, Univ Evry, Univ Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, Orsay, France
| | - Magdy M Mahfouz
- Laboratory for Genome Engineering and Synthetic Biology, King Abdullah, University of Science and Technology (KAUST), Thuwal, Saudi Arabia.
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Lucero L, Bazin J, Rodriguez Melo J, Ibañez F, Crespi MD, Ariel F. Evolution of the Small Family of Alternative Splicing Modulators Nuclear Speckle RNA-binding Proteins in Plants. Genes (Basel) 2020; 11:genes11020207. [PMID: 32085457 PMCID: PMC7073835 DOI: 10.3390/genes11020207] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 01/24/2020] [Accepted: 01/30/2020] [Indexed: 02/07/2023] Open
Abstract
RNA-Binding Protein 1 (RBP1) was first identified as a protein partner of the long noncoding RNA (lncRNA) ENOD40 in Medicago truncatula, involved in symbiotic nodule development. RBP1 is localized in nuclear speckles and can be relocalized to the cytoplasm by the interaction with ENOD40. The two closest homologs to RBP1 in Arabidopsis thaliana were called Nuclear Speckle RNA-binding proteins (NSRs) and characterized as alternative splicing modulators of specific mRNAs. They can recognize in vivo the lncRNA ALTERNATIVE SPLICING COMPETITOR (ASCO) among other lncRNAs, regulating lateral root formation. Here, we performed a phylogenetic analysis of NSR/RBP proteins tracking the roots of the family to the Embryophytes. Strikingly, eudicots faced a reductive trend of NSR/RBP proteins in comparison with other groups of flowering plants. In Medicago truncatula and Lotus japonicus, their expression profile during nodulation and in specific regions of the symbiotic nodule was compared to that of the lncRNA ENOD40, as well as to changes in alternative splicing. This hinted at distinct and specific roles of each member during nodulation, likely modulating the population of alternatively spliced transcripts. Our results establish the basis to guide future exploration of NSR/RBP function in alternative splicing regulation in different developmental contexts along the plant lineage.
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Affiliation(s)
- Leandro Lucero
- Instituto de Agrobiotecnología del Litoral, Universidad Nacional del Litoral, CONICET, FBCB, Centro Científico Tecnológico CONICET Santa Fe, Colectora Ruta Nacional No 168 km. 0, Paraje El Pozo, Santa Fe 3000, Argentina;
| | - Jeremie Bazin
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Universite Paris Sud, Universite Evry, Universite Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, 91405 Orsay, France;
| | - Johan Rodriguez Melo
- Instituto de Investigaciones Agrobiotecnológicas, CONICET, Universidad Nacional de Río Cuarto, Río Cuarto 5800, Argentina; (J.R.M.)
| | - Fernando Ibañez
- Instituto de Investigaciones Agrobiotecnológicas, CONICET, Universidad Nacional de Río Cuarto, Río Cuarto 5800, Argentina; (J.R.M.)
| | - Martín D. Crespi
- CNRS, INRA, Institute of Plant Sciences Paris-Saclay IPS2, Universite Paris Sud, Universite Evry, Universite Paris-Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, 91405 Orsay, France;
- Correspondence: (M.D.C.); (F.A.); Tel./Fax: +54-342-4511-370 (ext. 5017) (F.A.)
| | - Federico Ariel
- Instituto de Agrobiotecnología del Litoral, Universidad Nacional del Litoral, CONICET, FBCB, Centro Científico Tecnológico CONICET Santa Fe, Colectora Ruta Nacional No 168 km. 0, Paraje El Pozo, Santa Fe 3000, Argentina;
- Correspondence: (M.D.C.); (F.A.); Tel./Fax: +54-342-4511-370 (ext. 5017) (F.A.)
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Ling Y, Serrano N, Gao G, Atia M, Mokhtar M, Woo YH, Bazin J, Veluchamy A, Benhamed M, Crespi M, Gehring C, Reddy ASN, Mahfouz MM. Thermopriming triggers splicing memory in Arabidopsis. J Exp Bot 2018; 69:2659-2675. [PMID: 29474581 PMCID: PMC5920379 DOI: 10.1093/jxb/ery062] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [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: 11/13/2017] [Accepted: 02/13/2018] [Indexed: 05/18/2023]
Abstract
Abiotic and biotic stresses limit crop productivity. Exposure to a non-lethal stress, referred to as priming, can allow plants to survive subsequent and otherwise lethal conditions; the priming effect persists even after a prolonged stress-free period. However, the molecular mechanisms underlying priming are not fully understood. Here, we investigated the molecular basis of heat-shock memory and the role of priming in Arabidopsis thaliana. Comprehensive analysis of transcriptome-wide changes in gene expression and alternative splicing in primed and non-primed plants revealed that alternative splicing functions as a novel component of heat-shock memory. We show that priming of plants with a non-lethal heat stress results in de-repression of splicing after a second exposure to heat stress. By contrast, non-primed plants showed significant repression of splicing. These observations link 'splicing memory' to the ability of plants to survive subsequent and otherwise lethal heat stress. This newly discovered priming-induced splicing memory may represent a general feature of heat-stress responses in plants and other organisms as many of the key components are conserved among eukaryotes. Furthermore, this finding could facilitate the development of novel approaches to improve plant survival under extreme heat stress.
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Affiliation(s)
- Yu Ling
- Laboratory for Genome Engineering, Division of Biological Sciences, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Natalia Serrano
- Laboratory for Genome Engineering, Division of Biological Sciences, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Ge Gao
- Division of Biological Sciences, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Mohamed Atia
- Agricultural Genetic Engineering Research Institute (AGERI), Giza Egypt
| | - Morad Mokhtar
- Agricultural Genetic Engineering Research Institute (AGERI), Giza Egypt
| | - Yong H Woo
- Division of Biological Sciences, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Jeremie Bazin
- Institut des Sciences du Végétal (ISV), CNRS, UPR2355, Saclay Plant Sciences, Gif-sur-Yvette Cedex, France
| | - Alaguraj Veluchamy
- Division of Biological Sciences, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Moussa Benhamed
- Division of Biological Sciences, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Martin Crespi
- Institut des Sciences du Végétal (ISV), CNRS, UPR2355, Saclay Plant Sciences, Gif-sur-Yvette Cedex, France
| | - Christoph Gehring
- Division of Biological Sciences, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - A S N Reddy
- Department of Biology, Program in Molecular Plant Biology, Program in Cell and Molecular Biology, Colorado State University, Fort Collins, CO, USA
| | - Magdy M Mahfouz
- Laboratory for Genome Engineering, Division of Biological Sciences, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
- Correspondence:
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Scalbert-Dujardin M, Boldron A, Leroy E, Bazin J, Froment-Leclercq E. [Influenza vaccination and cystic fibrosis. Impact of an incentivisation campaign about influenza vaccination for patients attending the Dunkerque cystic fibrosis treatment centre and their health care workers]. Rev Mal Respir 2018; 35:279-286. [PMID: 29588090 DOI: 10.1016/j.rmr.2017.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 03/17/2017] [Indexed: 10/17/2022]
Abstract
INTRODUCTION The main aim of this study is to evaluate the effectiveness of preventive actions regarding influenza in the studied populations. The secondary objective is to analyze and understand the mechanisms which bring about a behavioural change regarding influenza vaccination. METHODS The interventional and prospective study was undertaken in the form of an anonymous questionnaire about influenza vaccination coverage and about the reasons for vaccinating or not vaccinating. The studied populations were patients followed for cystic fibrosis (n=67) in the Dunkerque cystic fibrosis treatment centre and their health care workers (n=117), before (April 2014) and after (April 2015) an information campaign and primary prevention actions (vaccination in the workplace with expanded time slots) in collaboration with the department of occupational medicine. RESULTS In 2015, the vaccination coverage rate of health care workers rose to 65.63%, that is to say 2.38 times more than in 2014 (27.55%). This difference is significant (χ2[1]=29.17, P<0.0001). However, no significant difference between 2014 and 2015 was observed among patients (children and adults) (χ2[1]=0.24, NS) whose vaccination coverage was already optimal before the study. CONCLUSIONS Raising awareness among health care workers about vaccination against influenza increases the coverage rate and decreases outbreaks of virus infection in the care services and among patients at risk. Three main levers were identified: the necessity of providing information on influenza vaccination to health care workers, the ease of vaccination access and the attitude towards vaccination of supervisory staff (health executives/doctors).
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Affiliation(s)
- M Scalbert-Dujardin
- Centre de ressources et de compétences de la mucoviscidose (CRCM) mixte, centre hospitalier de Dunkerque, 59385 Dunkerque, France.
| | - A Boldron
- Centre de ressources et de compétences de la mucoviscidose (CRCM) mixte, centre hospitalier de Dunkerque, 59385 Dunkerque, France
| | - E Leroy
- Centre de ressources et de compétences de la mucoviscidose (CRCM) mixte, centre hospitalier de Dunkerque, 59385 Dunkerque, France
| | - J Bazin
- Centre de ressources et de compétences de la mucoviscidose (CRCM) mixte, centre hospitalier de Dunkerque, 59385 Dunkerque, France
| | - E Froment-Leclercq
- Centre de ressources et de compétences de la mucoviscidose (CRCM) mixte, centre hospitalier de Dunkerque, 59385 Dunkerque, France
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Abstract
Translational regulation is important for plant growth, metabolism, and acclimation to environmental challenges. Ribosome profiling involves the nuclease digestion of mRNAs associated with ribosomes and mapping of the generated ribosome-protected footprints to transcripts. This is useful for investigation of translational regulation. Here we present a detailed method to generate, purify, and high-throughput-sequence ribosome footprints from Arabidopsis thaliana using two different isolation methods, namely, conventional differential centrifugation and the translating ribosome affinity purification (TRAP) technology. These methodologies provide researchers with an opportunity to quantitatively assess with high-resolution the translational activity of individual mRNAs by determination of the position and number of ribosomes in the corresponding mRNA. The results can provide insights into the translation of upstream open reading frames, alternatively spliced transcripts, short open reading frames, and other aspects of translation.
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Affiliation(s)
- Piyada Juntawong
- Center for Plant Cell Biology and Department of Botany and Plant Sciences, University of California, Riverside, CA, 92521, USA
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Bazin J, Bailey-Serres J. Emerging roles of long non-coding RNA in root developmental plasticity and regulation of phosphate homeostasis. Front Plant Sci 2015; 6:400. [PMID: 26106399 PMCID: PMC4460299 DOI: 10.3389/fpls.2015.00400] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 05/19/2015] [Indexed: 05/03/2023]
Abstract
Long non-coding RNAs (lncRNAs) have emerged as important regulators of gene expression in a variety of biological process and in multiple species. In plants, they are transcribed by different RNA polymerases and show diverse structural features. With the aid of next-generation sequencing technologies, a large number of lncRNA have been identified in model plants as well as in crops. This review focuses on the demonstration that lncRNAs control root system architecture, notably in response to phosphate availability, through regulation of transcription, alternative splicing, microRNA activity, messenger RNA stability and translation, illustrating remarkable diversity in their roles in regulating developmental plasticity.
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Affiliation(s)
- Jeremie Bazin
- Department of Botany and Plant Sciences, Center for Plant Cell Biology, University of California, Riverside, CA, USA
- Saclay Plant Science, Institut des Sciences du Végétal, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
- *Correspondence: Jeremie Bazin, Department of Botany and Plant Sciences, Center for Plant Cell Biology, University of California, Riverside, CA 92521, USA,
| | - Julia Bailey-Serres
- Department of Botany and Plant Sciences, Center for Plant Cell Biology, University of California, Riverside, CA, USA
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Bazin J, Batlla D, Dussert S, El-Maarouf-Bouteau H, Bailly C. Role of relative humidity, temperature, and water status in dormancy alleviation of sunflower seeds during dry after-ripening. J Exp Bot 2011; 62:627-40. [PMID: 20978143 PMCID: PMC3003820 DOI: 10.1093/jxb/erq314] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [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: 07/01/2010] [Revised: 08/27/2010] [Accepted: 09/03/2010] [Indexed: 05/26/2023]
Abstract
The effect of various combinations of temperature and relative humidity on dormancy alleviation of sunflower seeds during dry after-ripening was investigated. The rate of dormancy alleviation depended on both temperature and embryo moisture content (MC). Below an embryo MC of 0.1 g H(2)O g(-1) dw, dormancy release was faster at 15 °C than at higher temperatures. This suggests that dormancy release at low MC was associated with negative activation energy, supported by Arrhenius plots, and low Q(10) values. At higher MC, the rate of dormancy alleviation increased with temperature, correlating well with the temperature dependence of biochemical processes. These findings suggests the involvement of two distinct cellular mechanisms in dormancy release; non-enzymatic below 0.1 g H(2)O g(-1) dw and associated with active metabolism above this value. The effects of temperature on seed dormancy release above the threshold MC were analysed using a population-based thermal time approach and a model predicting the rate of dormancy alleviation is provided. Sunflower embryo dormancy release was effective at temperatures above 8 °C (the base temperature for after-ripening, Tb(AR), was 8.17 °C), and the higher the after-ripening temperature above this threshold value, the higher was the rate of dormancy loss. Thermodynamic analyses of water sorption isotherms revealed that dormancy release was associated with less bound water and increased molecular mobility within the embryonic axes but not the cotyledons. It is proposed that the changes in water binding properties result from oxidative processes and can, in turn, allow metabolic activities.
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Affiliation(s)
- J. Bazin
- UPMC Université Paris 06, UR5 UPMC - EAC 7180 CNRS, Bat C, 2ème étage, boîte 156, 4, place Jussieu, F-75252 Paris cedex 05, France
| | - D. Batlla
- IFEVA/Cátedra de Cerealicultura, CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE-Buenos Aires, Argentina
| | - S. Dussert
- IRD, UMR DIA-PC, 911 Av. Agropolis, BP64501, F-34394 Montpellier, France
| | - H. El-Maarouf-Bouteau
- UPMC Université Paris 06, UR5 UPMC - EAC 7180 CNRS, Bat C, 2ème étage, boîte 156, 4, place Jussieu, F-75252 Paris cedex 05, France
| | - C. Bailly
- UPMC Université Paris 06, UR5 UPMC - EAC 7180 CNRS, Bat C, 2ème étage, boîte 156, 4, place Jussieu, F-75252 Paris cedex 05, France
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Futier E, Vallet B, Robin E, Constantin J, Bazin J. ScvO2 and Pcv-aCO2 as complementary tools for goal-directed therapy during high-risk surgery. Crit Care 2010. [PMCID: PMC2934303 DOI: 10.1186/cc8386] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
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Futier E, Vallet B, Robin E, Vignaud M, Constantin J, Bazin J. Use of near-infrared spectroscopy during a vascular occlusion test to assess the microcirculatory response during fluid responsiveness. Crit Care 2010. [PMCID: PMC2934382 DOI: 10.1186/cc8384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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13
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Henocq E, Fanet G, Bazin J. [Immunotherapy of contact dermatitis]. Arch Mal Prof 1970; 31:147-9. [PMID: 5518881] [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: 01/15/2023]
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