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Milner MJ, Craze M, Hope MS, Wallington EJ. Turning Up the Temperature on CRISPR: Increased Temperature Can Improve the Editing Efficiency of Wheat Using CRISPR/Cas9. FRONTIERS IN PLANT SCIENCE 2020; 11:583374. [PMID: 33324433 PMCID: PMC7726164 DOI: 10.3389/fpls.2020.583374] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 10/23/2020] [Indexed: 05/24/2023]
Abstract
The application of CRISPR/Cas9 technologies has transformed our ability to target and edit designated regions of a genome. It's broad adaptability to any organism has led to countless advancements in our understanding of many biological processes. Many current tools are designed for simple plant systems such as diploid species, however, efficient deployment in crop species requires a greater efficiency of editing as these often contain polyploid genomes. Here, we examined the role of temperature to understand if CRISPR/Cas9 editing efficiency can be improved in wheat. The recent finding that plant growth under higher temperatures could increase mutation rates was tested with Cas9 expressed from two different promoters in wheat. Increasing the temperature of the tissue culture or of the seed germination and early growth phase increases the frequency of mutation in wheat when the Cas9 enzyme is driven by the ZmUbi promoter but not OsActin. In contrast, Cas9 expression driven by the OsActin promoter did not increase the mutations detected in either transformed lines or during the transformation process itself. These results demonstrate that CRISPR/Cas9 editing efficiency can be significantly increased in a polyploid cereal species with a simple change in growth conditions to facilitate increased mutations for the creation of homozygous or null knock-outs.
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Dmochowska-Boguta M, Kloc Y, Zielezinski A, Werecki P, Nadolska-Orczyk A, Karlowski WM, Orczyk W. TaWAK6 encoding wall-associated kinase is involved in wheat resistance to leaf rust similar to adult plant resistance. PLoS One 2020; 15:e0227713. [PMID: 31929605 PMCID: PMC6957155 DOI: 10.1371/journal.pone.0227713] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 12/25/2019] [Indexed: 11/19/2022] Open
Abstract
In wheat, adult plant resistance (APR) to leaf rust (Puccinia triticina), is effective in restricting pathogen growth and provides durable resistance against a wide range of virulent forms of P. triticina. Despite the importance, there is limited knowledge on the molecular basis of this type of resistance. We isolated and characterized the wall-associated kinase encoding gene in wheat, and assigned it as TaWAK6. Localization of TaWAK6 homeologs in A and B wheat subgenomes was consistent with the presence of the gene's orthologs in T. urartu (AA) and T. dicoccoides (AABB) and with the absence of its orthologs in Aegilops tauschii (DD). Overexpression of TaWAK6 did not change the wheat phenotype, nor did it affect seedling resistance. However, the adult plants overexpressing TaWAK6 showed that important parameters of APR were significantly elevated. Infection types scored on the first (flag), second and third leaves indicated elevated resistance, which significantly correlated with expression of TaWAK6. Analysis of plant-pathogen interactions showed a lower number of uredinia and higher rates of necrosis at the infection sites and this was associated with smaller size of uredinia and a longer latent period. The results indicated a role of TaWAK6 in quantitative partial resistance similar to APR in wheat. It is proposed that TaWAK6, which is a non-arginine-aspartate (non-RD) kinase, represents a novel class of quantitative immune receptors in monocots.
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Affiliation(s)
- Marta Dmochowska-Boguta
- Department of Genetic Engineering, Plant Breeding and Acclimatization Institute-National Research Institute, Radzikow, Blonie, Poland
| | - Yuliya Kloc
- Department of Genetic Engineering, Plant Breeding and Acclimatization Institute-National Research Institute, Radzikow, Blonie, Poland
| | - Andrzej Zielezinski
- Department of Computational Biology, Institute of Molecular Biology and Biotechnology, Faculty of Biology, Adam Mickiewicz University, Poznan, Poland
| | - Przemysław Werecki
- Department of Genetic Engineering, Plant Breeding and Acclimatization Institute-National Research Institute, Radzikow, Blonie, Poland
| | - Anna Nadolska-Orczyk
- Department of Functional Genomics, Plant Breeding and Acclimatization Institute-National Research Institute, Radzikow, Blonie, Poland
| | - Wojciech M. Karlowski
- Department of Computational Biology, Institute of Molecular Biology and Biotechnology, Faculty of Biology, Adam Mickiewicz University, Poznan, Poland
| | - Wacław Orczyk
- Department of Genetic Engineering, Plant Breeding and Acclimatization Institute-National Research Institute, Radzikow, Blonie, Poland
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Wu CS, Kuo WT, Chang CY, Kuo JY, Tsai YT, Yu SM, Wu HT, Chen PW. The modified rice αAmy8 promoter confers high-level foreign gene expression in a novel hypoxia-inducible expression system in transgenic rice seedlings. PLANT MOLECULAR BIOLOGY 2014; 85:147-61. [PMID: 24445591 DOI: 10.1007/s11103-014-0174-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 01/15/2014] [Indexed: 05/20/2023]
Abstract
Expression of α-amylase genes in rice is induced not only by sugar starvation and gibberellin (GA) but also by O2 deficiency. Promoters of two rice α-amylase genes, αAmy3 and αAmy8, have been shown to direct high-level production of recombinant proteins in rice suspension cells and germinated seeds. In the present study, we modified the cis-acting DNA elements within the sugar/GA response complex (SRC/GARC) of αAmy8 promoter. We found that addition of a G box and duplicated TA box leads to high-level expression of αAmy8 SRC/GARC and significantly enhances αAmy8 promoter activity in transformed rice cells and germinated transgenic rice seeds. We also show that these modifications have drastically increased the activity of αAmy8 promoter in rice seedlings under hypoxia. Our results reveal that the G box and duplicated TA box may play important roles in stimulating promoter activity in response to hypoxia in rice. The modified αAmy8 promoter was used to produce the recombinant human epidermal growth factor (hEGF) in rice cells and hypoxic seedlings. We found that the bioactive recombinant hEGF are stably produced and yields are up to 1.8% of total soluble protein (TSP) in transformed rice cells. The expression level of synthetic hEGF containing preferred rice codon usage comprises up to 7.8% of TSP in hypoxic transgenic seedlings. Our studies reveal that the modified αAmy8 promoter can be applicable in establishing a novel expression system for the high-level production of foreign proteins in transgenic rice cells and seedlings under hypoxia.
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Affiliation(s)
- Chung-Shen Wu
- Department of Bioagricultural Science, National Chiayi University, Chiayi, 60004, Taiwan, ROC
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Shakeel SN, Ul Haq N, Heckathorn S, Luthe DS. Analysis of gene sequences indicates that quantity not quality of chloroplast small HSPs improves thermotolerance in C4 and CAM plants. PLANT CELL REPORTS 2012; 31:1943-1957. [PMID: 22797908 DOI: 10.1007/s00299-012-1307-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Revised: 06/07/2012] [Accepted: 06/19/2012] [Indexed: 06/01/2023]
Abstract
Chloroplast-localized small heat-shock proteins (Cp-sHSP) protect Photosystem II and thylakoid membranes during heat and other stresses, and Cp-sHSP production levels are related to plant thermotolerance. However, to date, a paucity of Cp-sHSP sequences from C4 or CAM species, or from other extremely heat-tolerant species, has precluded an examination to determine if Cp-sHSP genes or proteins might differ among plants with photosynthetic pathways or between heat-sensitive and heat-tolerant species. To investigate this, we isolated and characterized novel Cp-sHSP genes in four plant species: two moderately heat-tolerant C4 species, Spartina alterniflora (monocot) and Amaranthus retroflexus (eudicot), and two very heat-tolerant CAM species, Agave americana (monocot) and Ferocactus wislizenii (eudicot) (respective genes: SasHSP27.12, ArsHSP26.43, AasHSP26.85 and FwsHSP27.52) by PCR-based genome walking and cDNA RACE. Analysis of these Cp-sHSPs has confirmed the presence of conserved domains common to previously examined species. As expected, the transit peptide was found to be the most variable part of these proteins. Promoter analysis of these genes revealed differences in CAM versus C3 and C4 species that were independent of a general difference between monocots and eudicots observed for the entire protein. Heat-induced gene and protein expression indicated that Cp-sHSP protein levels were correlated with thermotolerance of photosynthetic electron transport, and that in most cases protein and transcript levels were correlated. Thus, available evidence indicates little variation in the amino acid sequence of Cp-sHSP mature proteins between heat-sensitive and -tolerant species, but that variation in Cp-sHSP protein production is related to heat tolerance or photosynthetic pathway (CAM vs. C3 and C4) and is driven by promoter differences. Key message We isolated and characterized four novel Cp-sHSP genes with promoters from wild plants, analysis has shown qualitative and quantitative interspecific variations in Cp-sHSPs of C3, C4, and CAM plant thermotolerance.
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MESH Headings
- Adaptation, Physiological
- Agave/genetics
- Agave/physiology
- Amaranthus/genetics
- Amaranthus/physiology
- Amino Acid Sequence
- Chloroplast Proteins/genetics
- Chloroplast Proteins/metabolism
- Chloroplasts/genetics
- Chloroplasts/physiology
- Conserved Sequence
- DNA, Complementary/genetics
- DNA, Complementary/metabolism
- Genes, Chloroplast
- Genes, Plant
- Genomics/methods
- Heat-Shock Proteins, Small/genetics
- Heat-Shock Proteins, Small/metabolism
- Hot Temperature
- Molecular Sequence Data
- Photosynthesis
- Photosystem II Protein Complex/genetics
- Photosystem II Protein Complex/physiology
- Phylogeny
- Polymerase Chain Reaction
- Promoter Regions, Genetic
- Protein Biosynthesis
- Protein Structure, Tertiary
- Sequence Analysis, DNA
- Sequence Analysis, Protein/methods
- Species Specificity
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Affiliation(s)
- Samina N Shakeel
- Department of Biochemistry and Molecular Biology, Mississippi State University, Starkville, MS, USA.
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Mann DGJ, King ZR, Liu W, Joyce BL, Percifield RJ, Hawkins JS, LaFayette PR, Artelt BJ, Burris JN, Mazarei M, Bennetzen JL, Parrott WA, Stewart CN. Switchgrass (Panicum virgatum L.) polyubiquitin gene (PvUbi1 and PvUbi2) promoters for use in plant transformation. BMC Biotechnol 2011; 11:74. [PMID: 21745390 PMCID: PMC3161867 DOI: 10.1186/1472-6750-11-74] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Accepted: 07/11/2011] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND The ubiquitin protein is present in all eukaryotic cells and promoters from ubiquitin genes are good candidates to regulate the constitutive expression of transgenes in plants. Therefore, two switchgrass (Panicum virgatum L.) ubiquitin genes (PvUbi1 and PvUbi2) were cloned and characterized. Reporter constructs were produced containing the isolated 5' upstream regulatory regions of the coding sequences (i.e. PvUbi1 and PvUbi2 promoters) fused to the uidA coding region (GUS) and tested for transient and stable expression in a variety of plant species and tissues. RESULTS PvUbi1 consists of 607 bp containing cis-acting regulatory elements, a 5' untranslated region (UTR) containing a 93 bp non-coding exon and a 1291 bp intron, and a 918 bp open reading frame (ORF) that encodes four tandem, head -to-tail ubiquitin monomer repeats followed by a 191 bp 3' UTR. PvUbi2 consists of 692 bp containing cis-acting regulatory elements, a 5' UTR containing a 97 bp non-coding exon and a 1072 bp intron, a 1146 bp ORF that encodes five tandem ubiquitin monomer repeats and a 183 bp 3' UTR. PvUbi1 and PvUbi2 were expressed in all examined switchgrass tissues as measured by qRT-PCR. Using biolistic bombardment, PvUbi1 and PvUbi2 promoters showed strong expression in switchgrass and rice callus, equaling or surpassing the expression levels of the CaMV 35S, 2x35S, ZmUbi1, and OsAct1 promoters. GUS staining following stable transformation in rice demonstrated that the PvUbi1 and PvUbi2 promoters drove expression in all examined tissues. When stably transformed into tobacco (Nicotiana tabacum), the PvUbi2+3 and PvUbi2+9 promoter fusion variants showed expression in vascular and reproductive tissues. CONCLUSIONS The PvUbi1 and PvUbi2 promoters drive expression in switchgrass, rice and tobacco and are strong constitutive promoter candidates that will be useful in genetic transformation of monocots and dicots.
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Affiliation(s)
- David GJ Mann
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Zachary R King
- Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Wusheng Liu
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996, USA
| | - Blake L Joyce
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996, USA
| | - Ryan J Percifield
- Department of Genetics, University of Georgia, Athens, GA 30602, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Jennifer S Hawkins
- Department of Genetics, University of Georgia, Athens, GA 30602, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Peter R LaFayette
- Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Barbara J Artelt
- Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Jason N Burris
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Mitra Mazarei
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Jeffrey L Bennetzen
- Department of Genetics, University of Georgia, Athens, GA 30602, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Wayne A Parrott
- Department of Crop and Soil Sciences, University of Georgia, Athens, GA 30602, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
| | - Charles N Stewart
- Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996, USA
- The BioEnergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6026, USA
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Husaini AM, Rashid Z, Mir RUR, Aquil B. Approaches for gene targeting and targeted gene expression in plants. ACTA ACUST UNITED AC 2011; 2:150-62. [PMID: 22179193 DOI: 10.4161/gmcr.2.3.18605] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Transgenic science and technology are fundamental to state-of-the-art plant molecular genetics and crop improvement. The new generation of technology endeavors to introduce genes 'stably' into 'site-specific' locations and in 'single copy' without the integration of extraneous vector 'backbone' sequences or selectable markers and with a 'predictable and consistent' expression. Several similar strategies and technologies, which can push the development of 'smart' genetically modified plants with desirable attributes, as well as enhance their consumer acceptability, are discussed in this review.
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Affiliation(s)
- Amjad Masood Husaini
- Division of Plant Breeding and Genetics; Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir; Shalimar, India.
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7
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Masura SS, Parveez GKA, Ismail I. Isolation and characterization of oil palm constitutive promoter derived from ubiquitin extension protein (uep1) gene. N Biotechnol 2010; 27:289-99. [PMID: 20123048 DOI: 10.1016/j.nbt.2010.01.337] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2009] [Revised: 01/08/2010] [Accepted: 01/25/2010] [Indexed: 11/30/2022]
Abstract
The ubiquitin extension protein (uep1) gene was identified as a constitutively expressed gene in oil palm. We have isolated and characterized the 5' region of the oil palm uep1 gene, which contains an 828 bp sequence upstream of the uep1 translational start site. Construction of a pUEP1 transformation vector, which contains gusA reporter gene under the control of uep1 promoter, was carried out for functional analysis of the promoter through transient expression studies. It was found that the 5' region of uep1 functions as a constitutive promoter in oil palm and could drive GUS expression in all tissues tested, including embryogenic calli, embryoid, immature embryo, young leaflet from mature palm, green leaf, mesocarp and meristematic tissues (shoot tip). This promoter could also be used in dicot systems as it was demonstrated to be capable of driving gusA gene expression in tobacco.
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Affiliation(s)
- Subhi Siti Masura
- Advanced Biotechnology and Breeding Centre, Biological Research Division, Malaysian Palm Oil Board, P.O. Box 10620, 50720 Kuala Lumpur, Malaysia
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Sattarzadeh A, Fuller J, Moguel S, Wostrikoff K, Sato S, Covshoff S, Clemente T, Hanson M, Stern DB. Transgenic maize lines with cell-type specific expression of fluorescent proteins in plastids. PLANT BIOTECHNOLOGY JOURNAL 2010; 8:112-25. [PMID: 20051034 DOI: 10.1111/j.1467-7652.2009.00463.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Plastid number and morphology vary dramatically between cell types and at different developmental stages. Furthermore, in C4 plants such as maize, chloroplast ultrastructure and biochemical functions are specialized in mesophyll and bundle sheath cells, which differentiate acropetally from the proplastid form in the leaf base. To develop visible markers for maize plastids, we have created a series of stable transgenics expressing fluorescent proteins fused to either the maize ubiquitin promoter, the mesophyll-specific phosphoenolpyruvate carboxylase (PepC) promoter, or the bundle sheath-specific Rubisco small subunit 1 (RbcS) promoter. Multiple independent events were examined and revealed that maize codon-optimized versions of YFP and GFP were particularly well expressed, and that expression was stably inherited. Plants carrying PepC promoter constructs exhibit YFP expression in mesophyll plastids and the RbcS promoter mediated expression in bundle sheath plastids. The PepC and RbcS promoter fusions also proved useful for identifying plastids in organs such as epidermis, silks, roots and trichomes. These tools will inform future plastid-related studies of wild-type and mutant maize plants and provide material from which different plastid types may be isolated.
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Affiliation(s)
- Amir Sattarzadeh
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA
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9
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Abstract
The design of reverse genetic experiments that utilize transgenic approaches often requires transgenes to be expressed in a predefined pattern and there is limited information regarding the gene expression profile for specific promoters. It is important that expression patterns are predetermined in the specific genotype targeted for transformation because the same promoter-transgene construct can produce different expression patterns in different host species. This chapter compares constitutive, targeted, or inducible promoters that have been characterized in specific cereal species.
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Affiliation(s)
- Huw D Jones
- Department of Plant Sciences, Rothamsted Research, Centre for Crop Genetic Improvement, Harpenden, Hertfordshire, UK
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10
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Lu J, Sivamani E, Li X, Qu R. Activity of the 5' regulatory regions of the rice polyubiquitin rubi3 gene in transgenic rice plants as analyzed by both GUS and GFP reporter genes. PLANT CELL REPORTS 2008; 27:1587-600. [PMID: 18636262 DOI: 10.1007/s00299-008-0577-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2008] [Revised: 06/03/2008] [Accepted: 06/20/2008] [Indexed: 05/09/2023]
Abstract
Ubiquitin is an abundant protein involved in protein degradation and cell cycle control in plants and rubi3 is a polyubiquitin gene isolated from rice (Oryza sativa L.). Using both GFP and GUS as reporter genes, we analyzed the expression pattern of the rubi3 promoter as well as the effects of the rubi3 5'-UTR (5' untranslated region) intron and the 5' terminal 27 bp of the rubi3 coding sequence on the activity of the promoter in transgenic rice plants. The rubi3 promoter with the 5'-UTR intron was active in all the tissue and cell types examined and supported more constitutive expression of reporter genes than the maize Ubi-1 promoter. The rubi3 5'-UTR intron mediated enhancement on the activity of its promoter in a tissue-specific manner but did not alter its overall expression pattern. The enhancement was particularly intense in roots, pollen grains, inner tissue of ovaries, and embryos and aleurone layers in maturing seeds. The translational fusion of the first 27 bp of the rubi3 coding sequence to GUS gene further enhanced GUS expression directed by the rubi3 promoter in all the tissues examined. The rubi3 promoter should be an important addition to the arsenal of strong and constitutive promoters for monocot transformation and biotechnology.
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Affiliation(s)
- Jianli Lu
- Department of Crop Science, North Carolina State University, Raleigh, NC 27695, USA
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11
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Zhao X, de Palma J, Oane R, Gamuyao R, Luo M, Chaudhury A, Hervé P, Xue Q, Bennett J. OsTDL1A binds to the LRR domain of rice receptor kinase MSP1, and is required to limit sporocyte numbers. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2008; 54:375-87. [PMID: 18248596 PMCID: PMC2408674 DOI: 10.1111/j.1365-313x.2008.03426.x] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2007] [Revised: 12/20/2007] [Accepted: 12/21/2007] [Indexed: 05/18/2023]
Abstract
Hybrids lose heterotic yield advantage when multiplied sexually via meiosis. A potential alternative breeding system for hybrids is apospory, where female gametes develop without meiosis. Common among grasses, apospory begins in the nucellus, where aposporous initials (AIs) appear near the sexual megaspore mother cell (MeMC). The cellular origin of AIs is obscure, but one possibility, suggested by the mac1 and msp1 mutants of maize and rice, is that AIs are apomeiotic derivatives of the additional MeMCs that appear when genetic control over sporocyte numbers is relaxed. MULTIPLE SPOROCYTES1 (MSP1) encodes a leucine-rich-repeat receptor kinase, which is orthologous to EXS/EMS1 in Arabidopsis. Like mac1 and msp1, exs/ems1 mutants produce extra sporocytes in the anther instead of a tapetum, causing male sterility. This phenotype is copied in mutants of TAPETUM DETERMINANT1 (TPD1), which encodes a small protein hypothesized to be an extracellular ligand of EXS/EMS1. Here we show that rice contains two TPD1-like genes, OsTDL1A and OsTDL1B. Both are co-expressed with MSP1 in anthers during meiosis, but only OsTDL1A and MSP1 are co-expressed in the ovule. OsTDL1A binds to the leucine-rich-repeat domain of MSP1 in yeast two-hybrid assays and bimolecular fluorescence complementation in onion cells; OsTDL1B lacks this capacity. When driven by the maize Ubiquitin1 promoter, RNA interference against OsTDL1A phenocopies msp1 in the ovule but not in the anther. Thus, RNAi produces multiple MeMCs without causing male sterility. We conclude that OsTDL1A binds MSP1 in order to limit sporocyte numbers. OsTDL1A-RNAi lines may be suitable starting points for achieving synthetic apospory in rice.
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Affiliation(s)
- Xinai Zhao
- College of Agriculture and Biotechnology, Zhejiang UniversityHangzhou, China
- Plant Breeding, Genetics and Biotechnology Division, International Rice Research InstituteManila, Philippines
| | - Justina de Palma
- Plant Breeding, Genetics and Biotechnology Division, International Rice Research InstituteManila, Philippines
| | - Rowena Oane
- Plant Breeding, Genetics and Biotechnology Division, International Rice Research InstituteManila, Philippines
| | - Rico Gamuyao
- Plant Breeding, Genetics and Biotechnology Division, International Rice Research InstituteManila, Philippines
| | - Ming Luo
- Division of Plant Industry, Commonwealth Scientific and Industrial Research OrganizationCanberra, Australia
| | - Abdul Chaudhury
- Division of Plant Industry, Commonwealth Scientific and Industrial Research OrganizationCanberra, Australia
| | - Philippe Hervé
- Plant Breeding, Genetics and Biotechnology Division, International Rice Research InstituteManila, Philippines
| | - Qingzhong Xue
- College of Agriculture and Biotechnology, Zhejiang UniversityHangzhou, China
| | - John Bennett
- Plant Breeding, Genetics and Biotechnology Division, International Rice Research InstituteManila, Philippines
- For correspondence (fax +632 5805699; e-mail )
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12
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Perales L, Peñarrubia L, Cornejo MJ. Induction of a polyubiquitin gene promoter by dehydration stresses in transformed rice cells. JOURNAL OF PLANT PHYSIOLOGY 2008; 165:159-71. [PMID: 17570562 DOI: 10.1016/j.jplph.2006.12.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2006] [Revised: 12/15/2006] [Accepted: 12/18/2006] [Indexed: 05/11/2023]
Abstract
The expression of the maize polyubiquitin gene promoter UBI1 in rice cells has been used to study the involvement of ubiquitin in cell protection responses to dehydration caused by osmotic, saline or freezing stress. The effect of these stresses on UBI1 activity was investigated by the use of stably transformed rice calli (UBI1:GUS), as well as by transient expression experiments performed with cell lines with high or low tolerance to each type of stress. The theoretical analysis of the UBI1 promoter shows several putative stress-regulated boxes that could account for the stress-related UBI1 induction pattern described in this work. We suggest that the study of the differential UBI1 promoter-driven expression in rice cell lines with different level of tolerance to stress might be useful to elucidate complex signal transduction pathways in response to dehydration stresses in monocots.
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Affiliation(s)
- Lorena Perales
- Departmento de Biología Vegetal, Facultad de Biología, Avda. Dr Moliner 50, 46100 Burjasot, Valencia, Spain
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13
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Streatfield SJ. Approaches to achieve high-level heterologous protein production in plants. PLANT BIOTECHNOLOGY JOURNAL 2007; 5:2-15. [PMID: 17207252 DOI: 10.1111/j.1467-7652.2006.00216.x] [Citation(s) in RCA: 222] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Plants offer an alternative to microbial fermentation and animal cell cultures for the production of recombinant proteins. For protein pharmaceuticals, plant systems are inherently safer than native and even recombinant animal sources. In addition, post-translational modifications, such as glycosylation, which cannot be achieved with bacterial fermentation, can be accomplished using plants. The main advantage foreseen for plant systems is reduced production costs. Plants should have a particular advantage for proteins produced in bulk, such as industrial enzymes, for which product pricing is low. In addition, edible plant tissues are well suited to the expression of vaccine antigens and pharmaceuticals for oral delivery. Three approaches have been followed to express recombinant proteins in plants: expression from the plant nuclear genome; expression from the plastid genome; and expression from plant tissues carrying recombinant plant viral sequences. The most important factor in moving plant-produced heterologous proteins from developmental research to commercial products is to ensure competitive production costs, and the best way to achieve this is to boost expression. Thus, considerable research effort has been made to increase the amount of recombinant protein produced in plants. This research includes molecular technologies to increase replication, to boost transcription, to direct transcription in tissues suited for protein accumulation, to stabilize transcripts, to optimize translation, to target proteins to subcellular locations optimal for their accumulation, and to engineer proteins to stabilize them. Other methods include plant breeding to increase transgene copy number and to utilize germplasm suited to protein accumulation. Large-scale commercialization of plant-produced recombinant proteins will require a combination of these technologies.
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Affiliation(s)
- Stephen J Streatfield
- Applied Biotechnology Institute, Building 36, California Polytechnic State University, San Luis Obispo, CA 93407, USA.
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14
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Streatfield SJ. Mucosal immunization using recombinant plant-based oral vaccines. Methods 2006; 38:150-7. [PMID: 16431131 DOI: 10.1016/j.ymeth.2005.09.013] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2005] [Accepted: 09/19/2005] [Indexed: 11/21/2022] Open
Abstract
The induction of mucosal immunity is very important in conferring protection against pathogens that typically invade via mucosal surfaces. Delivery of a vaccine to a mucosal surface optimizes the induction of mucosal immunity. The apparent linked nature of the mucosal immune system allows delivery to any mucosal surface to potentially induce immunity at others. Oral administration is a very straightforward and inexpensive approach to deliver a vaccine to the mucosal lining of the gut. However, vaccines administered by this route are subject to proteolysis in the gastrointestinal tract. Thus, dose levels for protein subunit vaccines are likely to be very high and the antigen may need to be protected from proteolysis for oral delivery to be efficacious. Expression of candidate vaccine antigens in edible recombinant plant material offers an inexpensive means to deliver large doses of vaccines in encapsulated forms. Certain plant tissues can also stably store antigens for extensive periods of time at ambient temperatures, obviating the need for a cold-chain during vaccine storage and distribution, and so further limiting costs. Antigens can be expressed from transgenes stably incorporated into a host plant's nuclear or plastid genome, or from engineered plant viruses infected into plant tissues. Molecular approaches can serve to boost expression levels and target the expressed protein for appropriate post-translational modification. There is a wide range of options for processing plant tissues to allow for oral delivery of a palatable product. Alternatively, the expressed antigen can be enriched or purified prior to formulation in a tablet or capsule for oral delivery. Fusions to carrier molecules can stabilize the expressed antigen, aid in antigen enrichment or purification strategies, and facilitate delivery to effector sites in the gastrointestinal tract. Many antigens have been expressed in plants. In a few cases, vaccine candidates have entered into early phase clinical trials, and in the case of farmed animal vaccines into relevant animal trials.
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MESH Headings
- Administration, Oral
- Animals
- Antigens/administration & dosage
- Antigens/genetics
- Antigens/immunology
- Bacterial Toxins/genetics
- Bacterial Toxins/immunology
- Chloroplasts/genetics
- Clinical Trials, Phase I as Topic
- Gastroenteritis, Transmissible, of Swine/immunology
- Gastroenteritis, Transmissible, of Swine/prevention & control
- Gene Expression Regulation, Plant/genetics
- Gram-Negative Bacterial Infections/immunology
- Gram-Negative Bacterial Infections/prevention & control
- Humans
- Immunity, Mucosal/immunology
- Plant Extracts/genetics
- Plant Extracts/immunology
- Plant Viruses/genetics
- Plants, Genetically Modified/genetics
- Plants, Genetically Modified/immunology
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/immunology
- Recombinant Fusion Proteins/isolation & purification
- Rhizobium/genetics
- Seeds/chemistry
- Seeds/genetics
- Seeds/immunology
- Swine
- Transformation, Genetic
- Vaccination/methods
- Vaccines, Edible/administration & dosage
- Vaccines, Edible/genetics
- Vaccines, Edible/immunology
- Virus Diseases/immunology
- Virus Diseases/prevention & control
- Zea mays/genetics
- Zea mays/immunology
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Affiliation(s)
- Stephen J Streatfield
- Applied Biotechnology Institute, 101 Gateway Boulevard, Suite 100, College Station, TX 77845, USA.
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15
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Sivamani E, Qu R. Expression enhancement of a rice polyubiquitin gene promoter. PLANT MOLECULAR BIOLOGY 2006; 60:225-39. [PMID: 16429261 DOI: 10.1007/s11103-005-3853-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2005] [Accepted: 10/06/2005] [Indexed: 05/06/2023]
Abstract
An 808 bp promoter from a rice polyubiquitin gene, rubi3, has been isolated. The rubi3 gene contained an open reading frame of 1,140 bp encoding a pentameric polyubiquitin arranged as five tandem, head-to-tail repeats of 76 aa. The 1,140 bp 5' UTR intron of the gene enhanced its promoter activity in transient expression assays by 20-fold. Translational fusion of the GUS reporter gene to the coding sequence of the ubiquitin monomer enhanced GUS enzyme activity in transient expression assays by 4.3-fold over the construct containing the original rubi3 promoter (including the 5' UTR intron) construct. The enhancing effect residing in the ubiquitin monomer coding sequence has been narrowed down to the first 9 nt coding for the first three amino acid residues of the ubiquitin protein. Mutagenesis at the third nucleotide of this 9 nt sequence still maintains the enhancing effect, but leads to translation of the native GUS protein rather than a fusion protein. The resultant 5' regulatory sequence, consisting of the rubi3 promoter, 5' UTR exon and intron, and the mutated first 9 nt coding sequence, has an activity nearly 90-fold greater than the rubi3 promoter only (without the 5' UTR intron), and 2.2-fold greater than the maize Ubi1 gene promoter (including its 5' UTR intron). The newly created expression vector is expected to enhance transgene expression in monocot plants. Considering the high conservation of the polyubiquitin gene structure in higher plants, the observed enhancement in gene expression may apply to 5' regulatory sequences of other plant polyubiquitin genes.
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Affiliation(s)
- Elumalai Sivamani
- Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620, USA
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16
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Clough RC, Pappu K, Thompson K, Beifuss K, Lane J, Delaney DE, Harkey R, Drees C, Howard JA, Hood EE. Manganese peroxidase from the white-rot fungus Phanerochaete chrysosporium is enzymatically active and accumulates to high levels in transgenic maize seed. PLANT BIOTECHNOLOGY JOURNAL 2006; 4:53-62. [PMID: 17177785 DOI: 10.1111/j.1467-7652.2005.00157.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Manganese peroxidase (MnP) has been implicated in lignin degradation and thus has potential applications in pulp and paper bleaching, enzymatic remediation and the textile industry. Transgenic plants are an emerging protein expression platform that offer many advantages over traditional systems, in particular their potential for large-scale industrial enzyme production. Several plant expression vectors were created to evaluate the accumulation of MnP from the wood-rot fungus Phanerochaete chrysosporium in maize seed. We showed that cell wall targeting yielded full-length MnP, whereas cytoplasmic localization resulted in multiple truncated peroxidase polypeptides as detected by immunoblot analysis. In addition, the use of a seed-preferred promoter dramatically increased the expression levels and reduced the negative effects on plant health. Multiple independent transgenic lines were backcrossed with elite inbred corn lines for several generations with the maintenance of high-level expression, indicating genetic stability of the transgene.
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Affiliation(s)
- Richard C Clough
- ProdiGene, Inc., 101 Gateway Blvd., Suite 100, College Station, TX 77845, USA.
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