Добірка наукової літератури з теми "In Vitro Compartmentalised Self Replication"

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Статті в журналах з теми "In Vitro Compartmentalised Self Replication"

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Bansho, Yohsuke, Taro Furubayashi, Norikazu Ichihashi, and Tetsuya Yomo. "Host–parasite oscillation dynamics and evolution in a compartmentalized RNA replication system." Proceedings of the National Academy of Sciences 113, no. 15 (March 28, 2016): 4045–50. http://dx.doi.org/10.1073/pnas.1524404113.

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To date, various cellular functions have been reconstituted in vitro such as self-replication systems using DNA, RNA, and proteins. The next important challenges include the reconstitution of the interactive networks of self-replicating species and investigating how such interactions generate complex ecological behaviors observed in nature. Here, we synthesized a simple replication system composed of two self-replicating host and parasitic RNA species. We found that the parasitic RNA eradicates the host RNA under bulk conditions; however, when the system is compartmentalized, a continuous oscillation pattern in the population dynamics of the two RNAs emerges. The oscillation pattern changed as replication proceeded mainly owing to the evolution of the host RNA. These results demonstrate that a cell-like compartment plays an important role in host–parasite ecological dynamics and suggest that the origin of the host–parasite coevolution might date back to the very early stages of the evolution of life.
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Dramé-Maigné, Adèle, Anton S. Zadorin, Iaroslava Golovkova, and Yannick Rondelez. "Quantifying the Performance of Micro-Compartmentalized Directed Evolution Protocols." Life 10, no. 2 (February 13, 2020): 17. http://dx.doi.org/10.3390/life10020017.

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High-throughput, in vitro approaches for the evolution of enzymes rely on a random micro-encapsulation to link phenotypes to genotypes, followed by screening or selection steps. In order to optimise these approaches, or compare one to another, one needs a measure of their performance at extracting the best variants of a library. Here, we introduce a new metric, the Selection Quality Index (SQI), which can be computed from a simple mock experiment, performed with a known initial fraction of active variants. In contrast to previous approaches, our index integrates the effect of random co-encapsulation, and comes with a straightforward experimental interpretation. We further show how this new metric can be used to extract general protocol efficiency trends or reveal hidden selection mechanisms such as a counterintuitive form of beneficial poisoning in the compartmentalized self-replication protocol.
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3

Mulaj, Mentor, Tatiana Miti, and Martin Muschol. "Self-Replication of Transthyretin Amyloid Aggregates from Native Tetramers in vitro." Biophysical Journal 108, no. 2 (January 2015): 45a. http://dx.doi.org/10.1016/j.bpj.2014.11.280.

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4

Wang, Li-juan, Hou-xiu Wang, Longhe Jiang, and Chun-yang Zhang. "Development of an in Vitro Autocatalytic Self-Replication System for Biosensing Application." ACS Sensors 3, no. 12 (November 21, 2018): 2675–83. http://dx.doi.org/10.1021/acssensors.8b01171.

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5

Rupp, Brigitte, Zsolt Ruzsics, Torsten Sacher, and Ulrich H. Koszinowski. "Conditional Cytomegalovirus Replication In Vitro and In Vivo." Journal of Virology 79, no. 1 (January 1, 2005): 486–94. http://dx.doi.org/10.1128/jvi.79.1.486-494.2005.

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ABSTRACT We have established a conditional gene expression system for cytomegalovirus which allows regulation of genes independently from the viral replication program. Due to the combination of all elements required for regulated expression in the same viral genome, conditional viruses can be studied in different cell lines in vitro and in the natural host in vivo. The combination of a self-sufficient tetracycline-regulated expression cassette and Flp recombinase-mediated insertion into the viral genome allowed fast construction of recombinant murine cytomegaloviruses carrying different conditional genes. The regulation of two reporter genes, the essential viral M50 gene and a dominant-negative mutant gene (m48.2) encoding the small capsid protein, was analyzed in more detail. In vitro, viral growth was regulated by the conditional expression of M50 by 3 orders of magnitude and up to a millionfold when the dominant-negative small capsid protein mutant was used. In vivo, viral growth of the dominant-negative mutant was reduced to detection limits in response to the presence of doxycycline in the organs of mice. We believe that this conditional expression system is applicable to genetic studies of large DNA viruses in general.
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6

Hwang, Yung, Melinda Futran, Daniel Hidalgo, Divya Ramalingam Iyer, Nicholas Rhind, and Merav Socolovsky. "Global Increase in Replication Fork Speed during a p57KIP2-Regulated Erythroid Cell Fate Switch." Blood 128, no. 22 (December 2, 2016): 698. http://dx.doi.org/10.1182/blood.v128.22.698.698.

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Abstract Cell cycle regulators are increasingly implicated in cell fate decisions such as the acquisition or loss of pluripotency and self-renewal potential. The cell cycle mechanisms that regulate these cell fate decisions are largely unknown. Here we studied an S phase- dependent cell fate switch in the erythroid fetal liver, in which murine early erythroid progenitors transition in vivo from a self-renewal state into a phase of active erythroid gene transcription and concurrent maturational cell divisions. In the fetal liver, this transition corresponds to the transition from subset S0 (CD71-low, Ter119-negative) to subset S1 (CD71-high, Ter119-negative). We found that the S0 to S1 transition takes place during an S phase that is abruptly shorter (decreasing from 7 hours to 4 hours). Further, self-renewing S0 cells uniquely express the cyclin-dependent kinase (CDK) inhibitor p57KIP2 during S phase. To investigate its potential role, we studied DNA replication in vitro and in vivo in p57KIP2 -deficient fetal liver progenitors, employing a variety of techniques, including DNA combing. We found that S0 erythroid progenitors are dependent on p57KIP2-mediated slowing of replication forks for self-renewal, either in vivo, or in dexamethasone-dependent expansion cultures in vitro. The switch from self-renewal in S0 to differentiation in wild-type S1 progenitors entails rapid downregulation of p57KIP2 with a consequent global increase in replication fork speed and an abruptly shorter S phase. In the absence of p57KIP2, replication fork processivity increases prematurely in self-renewing S0 cells, prior to the activation of the erythroid transcriptional program (Figure 1), resulting in replicative stress and cell death. It is well established that differentiation leads to reprogramming of DNA replication, reflected by changes to origin usage and to the timing of replication of chromatin domains. Here we find that the replication program is fundamentally altered in additional key respects: the global processivity of replication forks, regulated by CDK activity, increases abruptly with the switch from self-renewal to differentiation, affecting DNA synthesis rates and S phase duration. Our results are also of interest since the regulation of replication kinetics was thought to be primarily via the regulation of origin firing efficiency, rather than via fork processivity. Here we found no difference in the former (there was no significant change in inter-origin distances, Figure 1). While the full significance of faster forks to the activation of the erythroid transcriptional program is yet to be understood, a recent report found that T cell help leads to faster forks and a shorter S phase in B cells (Gitlin et al., Science 349, 643-646 2015). Regulation of global fork speed may therefore be an intrinsic part of physiological developmental programs. Disclosures No relevant conflicts of interest to declare.
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7

Sugiyama, Kazuo, Kenji Suzuki, Takahide Nakazawa, Kenji Funami, Takayuki Hishiki, Kazuya Ogawa, Satoru Saito, et al. "Genetic Analysis of Hepatitis C Virus with Defective Genome and Its Infectivity in Vitro." Journal of Virology 83, no. 13 (April 15, 2009): 6922–28. http://dx.doi.org/10.1128/jvi.02674-08.

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ABSTRACT Replication and infectivity of hepatitis C virus (HCV) with a defective genome is ambiguous. We molecularly cloned 38 HCV isolates with defective genomes from 18 patient sera. The structural regions were widely deleted, with the 5′ untranslated, core, and NS3-NS5B regions preserved. All of the deletions were in frame, indicating that they are translatable to the authentic terminus. Phylogenetic analyses showed self-replication of the defective genomes independent of full genomes. We generated a defective genome of chimeric HCV to mimic the defective isolate in the serum. By using this, we demonstrated for the first time that the defective genome, as it is circulating in the blood, can be encapsidated as an infectious particle by trans complementation of the structural proteins.
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8

Zitzmann, Carolin, Christopher Dächert, Bianca Schmid, Hilde van der Schaar, Martijn van Hemert, Alan S. Perelson, Frank J. M. van Kuppeveld, Ralf Bartenschlager, Marco Binder, and Lars Kaderali. "Mathematical modeling of plus-strand RNA virus replication to identify broad-spectrum antiviral treatment strategies." PLOS Computational Biology 19, no. 4 (April 4, 2023): e1010423. http://dx.doi.org/10.1371/journal.pcbi.1010423.

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Plus-strand RNA viruses are the largest group of viruses. Many are human pathogens that inflict a socio-economic burden. Interestingly, plus-strand RNA viruses share remarkable similarities in their replication. A hallmark of plus-strand RNA viruses is the remodeling of intracellular membranes to establish replication organelles (so-called “replication factories”), which provide a protected environment for the replicase complex, consisting of the viral genome and proteins necessary for viral RNA synthesis. In the current study, we investigate pan-viral similarities and virus-specific differences in the life cycle of this highly relevant group of viruses. We first measured the kinetics of viral RNA, viral protein, and infectious virus particle production of hepatitis C virus (HCV), dengue virus (DENV), and coxsackievirus B3 (CVB3) in the immuno-compromised Huh7 cell line and thus without perturbations by an intrinsic immune response. Based on these measurements, we developed a detailed mathematical model of the replication of HCV, DENV, and CVB3 and showed that only small virus-specific changes in the model were necessary to describe the in vitro dynamics of the different viruses. Our model correctly predicted virus-specific mechanisms such as host cell translation shut off and different kinetics of replication organelles. Further, our model suggests that the ability to suppress or shut down host cell mRNA translation may be a key factor for in vitro replication efficiency, which may determine acute self-limited or chronic infection. We further analyzed potential broad-spectrum antiviral treatment options in silico and found that targeting viral RNA translation, such as polyprotein cleavage and viral RNA synthesis, may be the most promising drug targets for all plus-strand RNA viruses. Moreover, we found that targeting only the formation of replicase complexes did not stop the in vitro viral replication early in infection, while inhibiting intracellular trafficking processes may even lead to amplified viral growth.
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Jain, Bhawana, Amita Jain, Om Prakash, Ajay K. Singh, Tanushree Dangi, Mastan Singh, and K. P. Singh. "In-vitro validation of self designed siRNA targeting non-structural 1 gene of Influenza A virus." South Asian Journal of Experimental Biology 4, no. 6 (February 4, 2015): 315–22. http://dx.doi.org/10.38150/sajeb.4(6).p315-322.

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The genomic variability makes Influenza A virus (IAV) difficult to be con-trolled by existing vaccines or anti-influenza drugs. Viral gene targeting siRNA induces the RNAi mechanism in the host and silents the gene by cleaving mRNA. Objective was to develop siRNA targeting non-structural 1 gene and to validate its efficiency in vitro. siRNA was designed rationally, targeting the most conserved region (delineated with the help of multiple sequence align-ment) of NS1 gene of IAV strains. To choose the most efficient siRNA, three levels screening method was developed. Ultimately one siRNA duplex was selected on the basis of its unique position in conserved region. siRNA effica-cy was confirmed in vitro on commonly used Madin Darby Canine Kidney (MDCK) cell line for IAV propagation using two clinical isolates i.e. Influenza A/H3N2 [A/India/LKO864/2011(H3N2)] and Influenza A/pdmH1N1 [A/India/LKO2151/2012(H1N1)]. Of total 173 strains worldwide and 30 strains from India, 32 bp long (position 561 - 592) conserved region was identified. The longest ORF of NS1 gene was targeted by the selected siRNA, which showed 65.5% inhibition in replication of Influenza A/pdmH1N1 and 67.2% inhibition in replication of Influenza A/H3N2 at 48 hpi on MDCK cell line. This study shows that siRNA targeting NS1 may be quite effective in controlling IAV rep-lication so can be used as anti-IAV therapeutic agent.
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Bourne, Christina, Sejin Lee, Bollu Venkataiah, Angela Lee, Brent Korba, M. G. Finn, and Adam Zlotnick. "Small-Molecule Effectors of Hepatitis B Virus Capsid Assembly Give Insight into Virus Life Cycle." Journal of Virology 82, no. 20 (August 6, 2008): 10262–70. http://dx.doi.org/10.1128/jvi.01360-08.

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ABSTRACT The relationship between the physical chemistry and biology of self-assembly is poorly understood, but it will be critical to quantitatively understand infection and for the design of antivirals that target virus genesis. Here we take advantage of heteroaryldihydropyrimidines (HAPs), which affect hepatitis B virus (HBV) assembly, to gain insight and correlate in vitro assembly with HBV replication in culture. Based on a low-resolution crystal structure of a capsid-HAP complex, a closely related series of HAPs were designed and synthesized. These differentially strengthen the association between neighboring capsid proteins, alter the kinetics of assembly, and give rise to aberrant structures incompatible with a functional capsid. The chemical nature of the HAP variants correlated well with the structure of the HAP binding pocket. The thermodynamics and kinetics of in vitro assembly had strong and predictable effects on product morphology. However, only the kinetics of in vitro assembly had a strong correlation with inhibition of HBV replication in HepG2.2.15 cells; there was at best a weak correlation between assembly thermodynamics and replication. The correlation between assembly kinetics and virus suppression implies a competition between successful assembly and misassembly, small molecule induced or otherwise. This is a predictive and testable model for the mechanism of action of assembly effectors.
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Дисертації з теми "In Vitro Compartmentalised Self Replication"

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Zahoransky, Viktor Wendelin. "Information Transmission Across Generations : Thermodynamics and Evolutionary Implications." Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLS012.

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La Phi29 ADN polymérase (DNAP) dérive du bactériophage Phi29 et réplique l'ADN dans des conditions isothermes par amplification en cercle roulant. Il s'agit d'une enzyme particulièrement intéressante en raison de son exceptionnelle processivité et de son faible taux d'erreur, de l'ordre d'une paire de bases mésapparente pour chaque 10^(-5) à 10^(-6) nucléotides incorporés. La Phi29 DNAP atteint cette haute fidélité grâce à une fonction catalytique supplémentaire: La capacité à corriger les erreurs d'incorporation de bases par excision de nucléotides. Malgré les nombreuses études qui ont déjà été menées sur cette enzyme, la coordination entre ses principales fonctions catalytiques, la synthèse de l'ADN et la correction des erreurs, n'est pas entièrement comprise. Dans ce travail, nous développons plusieurs essais massivement parallélisés et à très haut débit, basés sur de grandes bibliothèques de gènes (10^(6)), afin de tester et de cribler les variants de la Phi29 DNAP dans un contexte évolutif. Pour la première fois, une technique d'émulsification membranaire est adaptée aux réactions d'auto-réplication compartimentée isotherme in vitro (iviCSR) facilitant le criblage simultané de variants dans différentes conditions environnementales. Nous avons trouvé des preuves que le variant R223T de la Phi29 DNAP peut répliquer l'ADN de manière plus progressive que l'enzyme WT dans des conditions éprouvantes et que la position de l'acide aminé 223 contribue à la coordination du compromis activité-fidélité de l'enzyme
Phi29 DNA polymerase (DNAP) derives from bacteriophage Phi29 and replicates DNA under isothermal conditions by rolling circle amplification. It is a particularly interesting enzyme due to its outstanding processivity and low error rates in the range of one base-pair mismatch for every 10^(-5) to 10^(-6) nucleotides incorporated. Phi29 DNAP achieves such high fidelity by means of an additional catalytic function: The ability to correct for base misincorporations by nucleotide excision. Despite the many studies that have already been conducted on this enzyme, the coordination between its main catalytic functions, DNA synthesis and error correction, is not fully understood.In this work we develop several massively parallelised, ultra-high-throughput assays, based on large (10^(6)) gene libraries, to challenge and screen for Phi29 DNAP variants in an evolutionary setting. For the first time, a membrane emulsification technique is adapted to in vitro isothermal compartmentalised self-replication (iviCSR) reactions facilitating simultaneous screenings of variants in different environmental conditions. We found evidence that Phi29 DNAP variant R223T can replicate DNA more processively than the WT enzyme under challenging conditions and that amino acid position 223 contributes to the coordination of the enzyme's activity-fidelity trade-off
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2

Lamble, Sarah. "Directed evolution of Thermus aquaticus DNA polymerase by compartmentalised self-replication." Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507743.

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The thermophilic enzyme, Thermus aquaticus (Taq) DNA polymerase, is an essential tool in molecular biology because of its ability to synthesis DNA in vitro and its inherent thermal stability. Taq DNA polymerase is widely used in the polymerase chain reaction (PCR), an essential technique in a broad range of different fields from academic research to clinical diagnostics. The use of PCR-based tests in diagnostic testing is ever increasing; however, many of the samples being tested contain substances that inhibit PCR and prevent target amplification. Many attempts have been made to engineer polymerases not only to increase resistance to overcome the problem of inhibition, but also to enhance other characteristics such as fidelity, processivity and thermostability. Heparin, found in blood samples, and phytate, found in faecal samples, are two examples from a number of known PCR inhibitors. The mode of action of most PCR inhibitors is not well understood, but inhibition is thought to occur by enzyme binding or through the chelation of Mg2+ ions essential for PCR. In this project, a system of directed evolution by compartmentalised self-replication (CSR) was established and successfully employed to screen a mutant library for Taq DNA polymerase variants with enhanced resistance to the inhibitors heparin and phytate. CSR is a recently-established high-throughput method for the creation of novel polymerases, based on a feedback loop whereby polymerase variants replicate their own encoding gene. A mutant library of 106 variants was produced by random mutagenesis error-prone PCR, in which only the polymerase domain of Taq was mutagenised. Firstly, the CSR system was established and tested by performing a screen in the presence of heparin to select for heparin-resistant variants. Characterisation of selected variants revealed that a single round of CSR had produced a Taq variant (P550S, T588S) with a 4-fold increase in heparin resistance. The IC50 was increased from 0.012U/ml heparin to 0.050U/ml heparin. The study with heparin was followed by a phytate screen, in which two rounds of CSR were performed with an initial round of error-prone PCR followed by re-diversification (recombination) of the mutant library using the staggered extension process (StEP). The two rounds of CSR yielded a Taq variant with a 2-fold increase in phytate-resistance compared to the wild-type, with IC50 increased from 360μM phytate to 700μM phytate. The best phytate mutant (P685S, M761V, A814T) was further characterised and it was found that the catalytic activity, thermostability and fidelity of the mutant were comparable to the wildtype enzyme. The position of resistance-conferring mutations of the novel Taq variants evolved in this study provided some evidence for the inhibitors’ predicted modes of action in the case 2 of both phytate and heparin. As phytate’s mode of action is poorly understood, further investigations were performed to elucidate its role in PCR inhibition. A thorough investigation into the importance of relative phytate and Mg2+ levels on PCR was conducted and revealed for the first time convincing evidence that the primary mode of phytatemediated PCR inhibition is by chelation. Further work led to the successful crystallisation of Taq in the presence of phytate, although subsequent X-ray diffraction data to 2.5Å did not reveal phytate bound within the enzyme structure. Site-directed mutagenesis studies were used to probe cross-over between heparin and phytate-conferring mutations. Thus, in addition to providing valuable information for novel Taq variants with a potential application in fecal-based PCR diagnostic tests, this project has begun to provide insight into the fundamental aspects of the mode of action of phytate as a polymerase and PCR inhibitor.
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3

Davidson, Eric Alan. "Synthetic transcription systems." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-948.

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In this work, we seek to expand synthetic in vitro biological systems by using water-in-oil emulsions to provide an environment conducive to directed evolution. We approach this primarily by utilizing a model transcription system, the T7 RNA polymerase and promoter, which is orthogonal to both bacterial and eukaryotic transcription systems and is highly functional in vitro. First, we develop a method to identify functional promoter sequences completely in vitro. This method is tested using the T7 RNA polymerase-promoter model system. We then configure the T7 transcription system as an ‘autogene’ and investigate how this positive feedback circuit (whereby a T7 promoter expresses a T7 RNA polymerase gene) functions across various in vitro platforms, including while compartmentalized. The T7 autogene can be envisioned as a self-replicating system when compartmentalized, and its use for directed evolution is examined. Finally, we look towards future uses for these in vitro systems. One interesting application is to expand the utilization of unnatural base pairs within the context of a synthetic system. We investigate the ability of T7 RNA polymerase to recognize and utilize unnatural base pairs within the T7 promoter, complementing existing work on the utilization of unnatural base pairs for in vitro replication and transcription with an investigation of more complex protein-dependent regulatory function. We envision this work as a foundation for future in vitro synthetic biology efforts.
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Звіти організацій з теми "In Vitro Compartmentalised Self Replication"

1

Dawson, William O., and Moshe Bar-Joseph. Creating an Ally from an Adversary: Genetic Manipulation of Citrus Tristeza. United States Department of Agriculture, January 2004. http://dx.doi.org/10.32747/2004.7586540.bard.

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Citrus is one of the major agricultural crops common to Israel and the United States, important in terms of nutrition, foreign exchange, and employment. The economy of both citrus industries have been chronically plagued by diseases caused by Citrus tristeza virus (CTV). The short term solution until virus-resistant plants can be used is the use of mild strain cross-protection. We are custom designing "ideal" protecting viruses to immunize trees against severe isolates of CTV by purposely inoculating existing endangered trees and new plantings to be propagated as infected (protected) citrus budwood. We crossed the substantial technological hurdles necessary to accomplish this task which included developing an infectious cDNA clone which allows in vitro manipulation of the virus and methods to then infect citrus plants. We created a series of hybrids between decline-inducing and mild CTV strains, tested them in protoplasts, and are amplifying them to inoculate citrus trees for evaluation and mapping of disease determinants. We also extended this developed technology to begin engineering transient expression vectors based on CTV as tools for genetic improvement of tree crops, in this case citrus. Because of the long periods between genetic transformation and the ultimate assay of mature tree characteristics, there is a great need for an effective system that allows the expression or suppression of target genes in fruiting plants. Virus-based vectors will greatly expedite progress in citrus genetic improvement. We characterized several components of the virus that provides necessary information for designing virus-based vectors. We characterized the requirements of the 3 ’-nontranslated replication promoter and two 3 ’-ORF subgenomic (sg) mRNA controller elements. We discovered a novel type of 5’-terminal sgRNAs and characterized the cis-acting control element that also functions as a strong promoter of a 3 ’-sgRNA. We showed that the p23 gene controls negative-stranded RNA synthesis and expression of 3 ’ genes. We identified which genes are required for infection of plants, which are host range determinants, and which are not needed for plant infection. We continued the characterization of native dRNA populations and showed the presence of five different classes including class III dRNAs that consists of infectious and self-replicating molecules and class V dRNAs that contain all of the 3 ’ ORFs, along with class IV dRNAs that retain non-contiguous internal sequences. We have constructed and tested in protoplasts a series of expression vectors that will be described in this proposal.
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