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PubMed1978

Bacteriophage lambda and plasmid vectors, allowing fusion of cloned genes in each of the three translational phases.

We have constructed vectors from bacteriophage lambda and from plasmid pBR322 having a single EcoRI restriction site which is immediately downstream from the lac UV5 promotor. Each vector allows the fusion of a cloned gene to the lac Z gene in a different phase relative to the translation initiation codon of the lac Z gene. These vectors were constructed through modification of the initial EcoRI restriction site by S1 endonuclease treatment and then addition of octadeoxyribonucleotides (EcoRI linkers), which shifted the restriction site by 2 or 4 nucleotides. Used in combination these vectors should allow translation of a cloned gene in any one of the three coding phases. The bacteriophages vectors are certified as B2 (EK2) safety level vectors by the French "recombinaison génétique in vitro" committee (D.G.R.S.T.).

Base Sequence↗
PubMed2016

Adeno-associated virus (AAV) vectors in cancer gene therapy.

Gene delivery vectors based on adeno-associated virus (AAV) have been utilized in a large number of gene therapy clinical trials, which have demonstrated their strong safety profile and increasingly their therapeutic efficacy for treating monogenic diseases. For cancer applications, AAV vectors have been harnessed for delivery of an extensive repertoire of transgenes to preclinical models and, more recently, clinical trials involving certain cancers. This review describes the applications of AAV vectors to cancer models and presents developments in vector engineering and payload design aimed at tailoring AAV vectors for transduction and treatment of cancer cells. We also discuss the current status of AAV clinical development in oncology and future directions for AAV in this field.

Capsid Proteins↗
PubMed1975

Epidemic Venezuelan equine encephalitis in North America in 1971: vector studies.

A major epidemic of Venezuelan equine encephalitis occurred in south Texas in the summer of 1971. More than 1500 equines died of VEE in Texas, and 110 human cases with no deaths were reported. Vector studies in south Texas and northern Tamaulipas revealed that the overall mosquito infection rates during the peak of the epidemic were about 1:100, one of the highest rates observed for a major epidemic. Mosquito infection rates of this magnitude could easily explain the intensity of VEE outbreaks in both equines and man. A total of 943 VEE virus isolations were made from mosquitoes. Eight of the 12 mosquito species found infected were implicated in the epidemic cycle of VEE for the first time. Sufficient laboratory and field evidence is available to prove that Psorophora confinnis was one of the primary vectors of VEE. The lack of laboratory evidence necessitates the use of the term "probable" primary vectors for other species apparently equally as involved on the basis of field infections; these include Aedes sollicitans, Aedes thelcter and Psorophora discolor. Eight other species from which less than 10 VEE virus isolations were made were considered auxiliary vectors. Mosquitoes of some species were tested individually; such tests showed 2-4% of the probable primary vectors to be infected. The first isolation of VEE virus of the epidemic was made from P. confinnis on June 28, 1971. Highest mosquito infection rates occurred during the week of July 5. Mosquito infection rates declined precipitously in the last 3 weeks of July 1971, signaling the end of the epidemic in the study area. One explanation for the decline was that equines, the principal epidemic hosts, were eliminated as a source of virus by death or by acquisition of natural or induced immunity. Mosquito control appeared to be effective in reducing the infected mosquito population while the immunization of equines with TC 83 VEE vaccine was accomplished. Quarantines appeared to be effective in restricting the VEE virus activity to south Texas. Undoubtedly all of the control measures contributed to stopping the epidemic. Continued VEE surveillance by various government and other agencies failed to reveal any further epidemic VEE activity in the US in 1972. Other arboviruses isolated during the VEE studies in south Texas included St. Louis encephalitis virus, and San Angelo subtype of the California Group. A virus of the Bunyamwera Group was also isolated from Palo Blanco, Tamaulipas.

Animals↗
PubMed2026

Phytoplasma-plant interactions: effector-mediated host reprogramming, hormonal crosstalk, metabolic alterations and plant-mediated vector manipulation.

Phytoplasmas are wall-less, phloem-restricted bacterial pathogens that infect over 1,000 plant species, causing substantial losses in agriculture, horticulture, and forestry worldwide. Despite their reduced genomes and limited metabolic autonomy, these obligate parasites colonize diverse hosts through secreted effector proteins that extensively reprogram plant development, metabolism, immune signalling, and vector interactions. Advances in genomics, transcriptomics, proteomics, metabolomics, and functional studies have substantially clarified the molecular basis of phytoplasma pathogenicity and symptom development. This review synthesizes current understanding of phytoplasma-plant interactions, covering phytoplasma biology, genome evolution, and the infection cycle across plant and insect vector hosts. We examine the molecular functions of key effectors, SAP11, SAP54/PHYL1, SAP05, TENGU, SWP1, and recently identified virulence factors, focusing on how they target host transcription factors, phytohormone networks, protein degradation pathways, and immune responses to promote colonization and disease progression. We further discuss how phytoplasma infection disrupts phytohormone signalling, primary and secondary metabolism, and developmental programs to produce characteristic disease symptoms, with particular attention to pathogen-induced changes in host volatiles and nutritional quality that alter vector behaviour and enhance transmission. Finally, we summarize insights from multi-omics studies and emerging management strategies, including CRISPR-based genome editing, RNAi, rapid molecular diagnostics, resistant cultivars, microbiome-based approaches, and sustainable vector control, and highlight key knowledge gaps and priorities for developing effective, environmentally sustainable phytoplasma disease management.

Phytoplasma↗
PubMed2024

Shedding light on Klebsiella pneumoniae virulence: Engineering of broad host range bioluminescence reporter vectors for transcriptional analysis in drug resistant pathogens.

In this work, we report the construction of four bacterial luciferase-based promoter probe vectors with an expanded set of selectable markers, designed to facilitate their use in antibiotic-resistant bacteria. These vectors contain the low-copy-number, broad-host-range pBBR origin of replication and an origin of transfer, allowing efficient conjugative transformation into various bacterial genera. The broad host range origin also enables their use in bacterial strains that harbor other plasmids, as the pBBR origin is compatible with a wide variety of other plasmid replication systems. The utility of these vectors was demonstrated by quantifying capsule gene expression in both classical and hypervirulent Klebsiella pneumoniae strains lacking tolC, which encodes the outer membrane pore protein for tripartite transport systems. Our results revealed that the tolC mutation reduced capsule gene expression, highlighting a critical role for tolC in K. pneumoniae pathobiology and the utility of bioluminescence for studying gene expression in real time. These new vectors provide a flexible platform for circumventing antibiotic resistance phenotypes and studying gene expression across diverse bacterial species, including strains containing additional plasmids.

Klebsiella pneumoniae↗
PubMed2025

Quantifying the mutational landscape of retroviral and lentiviral vectors in gene therapy patients.

Adenosine deaminase severe combined immunodeficiency (ADA-SCID) is a monogenic disorder caused by mutations in the ADA gene. Gene therapy using γ-retroviral and lentiviral vector gene addition approaches have shown curative results. We sequenced the ADA transgene in transduced CD3+ T cells, and in peripheral blood cells from patients treated with autologous CD34+ cells transduced with either a γ-retroviral or lentiviral ADA gene vector to assess transgene mutational profiles. In both CD3+ T cells and ADA-SCID patients' cells treated with the lentiviral vector, we observed significantly higher occurrences of guanine (G)-to-adenosine (A) base substitutions than with the γ-retroviral vector. We hypothesized that this G-to-A mutational signature was due to the APOBEC3 cytosine deaminase protein family. By knocking out APOBEC3 genes in HEK239T packaging cells, APOBEC3-mediated mutagenesis decreased by 91.2% along the transgene in CD34+ transduced cells in comparison to CD34+ cells transduced with lentiviral supernatant packaged in parental HEK293T cells.

Humans↗
PubMed2026

Transforming Plant Viruses into Vectors for Next-Generation Agriculture-A Review.

Plant viral vectors have evolved from tools for transient gene expression into a versatile platform for precise genetic intervention, offering a rapid, transgene-free alternative to conventional crop transformation. This review critically assesses their engineering for scalable field application, moving beyond foundational techniques like virus-induced gene silencing (VIGS). We highlight how advanced vector design, including deconstructed genomes and synthetic regulatory circuits enhances cargo capacity, specificity, and biosafety. The integration of viral delivery with CRISPR-Cas systems has unlocked virus-induced genome editing (VIGE), base editing, and prime editing, enabling heritable trait modification without tissue culture. However, the transition from proof-of-concept in model plants to robust field technology hinges on overcoming critical bottlenecks: expanding host range through chimeric vectors, ensuring environmental containment, and developing scalable delivery methods such as nano-formulations or adjusted agroinfiltration protocols. We evaluate these delivery routes and emerging synergies with nanobiotechnology for targeted and efficient applications. While challenges in regulation, public perception, and large-scale production persist, the strategic engineering of viral vectors for stability, specificity, and safety positions them as a transformative, next-generation biotechnological input for achieving sustainable crop improvement and protection under changing climatic conditions.

Plant Viruses↗
PubMed1979

A new host-vector system allowing selection for foreign DNA inserts in bacteriophage lambda gtWES.

An improved vector (lambda gtWES.T5-622) for EcoRI fragments has been derived from EK2 vector lambda gtWES.lambdaB' by replacing the lambda B fragment with two identical 1.1 Md fragments from the pre-early region of bacteriophage T5. The new vector has two advantages which facilitate elimination of parental-type recombinants in an in vitro recombination experiment. Firstly, the 1.1 Md insert is too small to be re-inserted into lambda gtWES in a single copy. Secondly the 1.1 Md T5 fragment carries T5 gene A3 which prevents growth of phage retaining this fragment when the Excherichia coli host carries plasmid ColIb. Thus, essentially all plaques are due to phage with donor DNA inserts and are free of T5 DNA fragments. The size usually given as the theoretical minimum size for insertion into the lambda gt series of vectors is 0.66 Md. We have shown that this size is an underestimate and that the lower limit is about 1.6 Md. A precise estimate is difficult since there is strong selection, among phage having small inserts, for those which have acquired additional genetic material by duplication of the lambda DNA.

Bacteriophage lambda↗
PubMed2015

In Silico Reconstruction of the Viral Evolutionary Lineage Yields a Potent Gene Therapy Vector.

Adeno-associated virus (AAV) vectors have emerged as a gene-delivery platform with demonstrated safety and efficacy in a handful of clinical trials for monogenic disorders. However, limitations of the current generation vectors often prevent broader application of AAV gene therapy. Efforts to engineer AAV vectors have been hampered by a limited understanding of the structure-function relationship of the complex multimeric icosahedral architecture of the particle. To develop additional reagents pertinent to further our insight into AAVs, we inferred evolutionary intermediates of the viral capsid using ancestral sequence reconstruction. In-silico-derived sequences were synthesized de novo and characterized for biological properties relevant to clinical applications. This effort led to the generation of nine functional putative ancestral AAVs and the identification of Anc80, the predicted ancestor of the widely studied AAV serotypes 1, 2, 8, and 9, as a highly potent in vivo gene therapy vector for targeting liver, muscle, and retina.

Dependovirus↗
PubMed2023

Evolution and assembly of Anopheles aquasalis's immune genes: primary malaria vector of coastal Central and South America and the Caribbean Islands.

Anophelines are vectors of malaria, the deadliest disease worldwide transmitted by mosquitoes. The availability of genomic data from various Anopheles species allowed evolutionary comparisons of the immune response genes in search of alternative vector control of the malarial parasites. Now, with the Anopheles aquasalis genome, it was possible to obtain more information about the evolution of the immune response genes. Anopheles aquasalis has 278 immune genes in 24 families or groups. Comparatively, the American anophelines possess fewer genes than Anopheles gambiae s. s., the most dangerous African vector. The most remarkable differences were found in the pathogen recognition and modulation families like FREPs, CLIP and C-type lectins. Even so, genes related to the modulation of the expression of effectors in response to pathogens and gene families that control the production of reactive oxygen species were more conserved. Overall, the results show a variable pattern of evolution in the immune response genes in the anopheline species. Environmental factors, such as exposure to different pathogens and differences in the microbiota composition, could shape the expression of this group of genes. The results presented here will contribute to a better knowledge of the Neotropical vector and open opportunities for malaria control in the endemic-affected areas of the New World.

Animals↗
PubMed2025

Borrelia burgdorferi loses essential genetic elements and cell proliferative potential during stationary phase in culture but not in the tick vector.

The Lyme disease agent Borrelia burgdorferi is a polyploid bacterium with a segmented genome in which both the chromosome and over 20 distinct plasmids are present in multiple copies per cell. This pathogen can survive for at least 9 months in its tick vector in an apparent dormant state between blood meals, without losing cell proliferative capability when re-exposed to nutrients. Cultivated B. burgdorferi cells grown to stationary phase or resuspended in nutrient-limited media are often used to study the effects of nutrient deprivation. However, a thorough assessment of the spirochete's ability to recover from nutrient depletion has been lacking. Our study shows that starved B. burgdorferi cultures rapidly lose cell proliferative ability. Loss of genetic elements essential for cell proliferation contributes to the observed proliferative defect in stationary phase. The gradual decline in copies of genetic elements is not perfectly synchronized between chromosomes and plasmids, generating cells that harbor one or more copies of the essential chromosome but lack all copies of one or more non-essential plasmids. This phenomenon likely contributes to the well-documented issue of plasmid loss during in vitro cultivation of B. burgdorferi. In contrast, B. burgdorferi cells from ticks starved for 14 months showed no evidence of reduced cell proliferative ability or plasmid loss. Beyond their practical implications for studying B. burgdorferi, these findings suggest that the midgut of the tick vector offers a unique environment that supports the maintenance of B. burgdorferi's segmented genome and cell proliferative potential during periods of tick fasting.IMPORTANCEBorrelia burgdorferi causes Lyme disease, a prevalent tick-borne illness. B. burgdorferi must survive long periods (months to a year) of apparent dormancy in the midgut of the tick vector between blood meals. Resilience to starvation is a common trait among bacteria. However, this study reveals that, in laboratory cultures, B. burgdorferi poorly endures starvation and rapidly loses viability. This decline is linked to a gradual loss of genetic elements required for cell proliferation. These results suggest that the persistence of B. burgdorferi in nature is likely shaped more by unique environmental conditions in the midgut of the tick vector than by an innate ability of this bacterium to endure nutrient deprivation.

Borrelia burgdorferi↗
PubMed2022

Identification of Novel Retinal Pericyte-Targeting rAAV Vectors Through Directed Evolution.

PURPOSE: Retinal pericytes play a vital role in maintaining retinal homeostasis, and their dysfunction underlies pathogenesis in such vascular eye diseases as diabetic retinopathy and wet age-related macular degeneration. Consequently, retinal pericytes are attractive therapeutic targets for gene therapy, but effectively targeting pericytes with recombinant adeno-associated virus (rAAV) vectors remains a challenge. METHODS: We introduced genetic modifications into the surface-exposed variable regions of the rAAV2/2 capsid to generate a complex library (>1 × 107) of capsid mutants that were then screened for preferential tropism toward retinal pericytes. Using the Tg(Cspg4-DsRed.T1)1Akik/J reporter mouse model, which has red fluorescent pericytes that can be isolated via flow cytometry in order to recover vector genomes, we performed three rounds of screening and identified seven putative mutants capable of transducing retinal pericytes. RESULTS: Following intravitreal administration of mutant vectors packaging ubiquitously expressing green fluorescent protein reporters and postmortem flow cytometry of enzymatically digested retinae, two mutants in particular, Peri-E and Peri-G, demonstrated significantly greater transduction of retinal pericytes than unmodified rAAV2/2 (1.4-fold and 2.8-fold, respectively). CONCLUSIONS: Although difficult to characterize the effect of each point mutation in the context of multiple amino acid variations from the wild-type AAV2 sequence, we identified several point mutations that may play critical roles in limiting HSPG binding, evading neutralization by murine A20 monoclonal antibodies, modulating antigenicity, and evading ubiquitination to ultimately improve transduction efficiency of retinal pericytes. TRANSLATIONAL RELEVANCE: Identification of novel retinal pericyte targeting rAAV vectors enables the development of new, long-lasting gene therapies for retinal diseases such as diabetic retinopathy and wet age-related macular degeneration.

Animals↗
PubMed2026

Ex vivo long-term expansion of human hematopoietic stem and progenitor cells as a tool for modeling vector integration sites and clonality.

BACKGROUND: Gene therapy (GT) using retroviral vectors (RVs) is efficacious in treating monogenic diseases. However, there is an inherent risk for severe adverse effects due to insertional mutagenesis. Preclinical safety assessment and patient monitoring are inevitable in GT. To assess the genotoxic risk of novel RV vectors, mainly murine hematopoietic stem and progenitor cells (HPSCs) are routinely used, because human HSPCs cannot be immortalized in vitro using mutagenic vectors. In this study, we aim to identify early signs of clonal outgrowth by performing integration site analyses (ISA). METHODS: The small molecules A83-01, pomalidomide, and UM171 (APU) were used for the ex vivo expansion, lentiviral transduction, and long-term cultivation of umbilical cord blood-derived HSPCs. We determined the influence of APU on the stemness of HSPCs and their differentiation capacity via single-cell RNA sequencing (scRNA seq) and in xenotransplantation studies. To track vector insertion site dynamics, we transduced 7-day expanded HSPCs with a mutagenic or a safer RV. ISA was conducted in human HSPCs over a 5-week cultivation in vitro and compared to the bone marrow of xenotransplanted mice to assess clonal skewings. RESULTS: APU supported the expansion of CD34+CD38-CD45RA-CD90+EPCR+ HSPCs. scRNA seq confirmed the enrichment of HSC signature genes in APU-expanded HSPCs compared to the clinically used medium SFT3 (SCF, FLT3-L, TPO, IL-3). After RV transduction, APU still maintained around 30% of CD34+ cells for 5 more weeks. Without the compounds, already 2 weeks post-transduction, less than 10% of cells were CD34+. The long-term culture allowed the detection of high-risk integrations of the mutagenic SIN-LV.SF in MEIS1 or SUSD6 due to their increasing abundance over time. Bone marrow of xenotransplanted mice was less clonal but did not support the outgrowth of insertional mutants. Overall, APU increased clonal diversity. CONCLUSIONS: Our findings propose that long-term cultivation of transduced HSPC in APU allows for outgrowth of clonal integration sites. The decrease of clonality has been observed in gene therapy patient's years after treatment. Thus, the in vitro model could be used to develop novel human HSPC-based genotoxicity assays that predict insertional mutagenesis, in addition to existing preclinical biosafety assays.

Humans↗
PubMed2024

Combination of computational techniques and RNAi reveal targets in Anopheles gambiae for malaria vector control.

Increasing reports of insecticide resistance continue to hamper the gains of vector control strategies in curbing malaria transmission. This makes identifying new insecticide targets or alternative vector control strategies necessary. CLassifier of Essentiality AcRoss EukaRyote (CLEARER), a leave-one-organism-out cross-validation machine learning classifier for essential genes, was used to predict essential genes in Anopheles gambiae and selected predicted genes experimentally validated. The CLEARER algorithm was trained on six model organisms: Caenorhabditis elegans, Drosophila melanogaster, Homo sapiens, Mus musculus, Saccharomyces cerevisiae and Schizosaccharomyces pombe, and employed to identify essential genes in An. gambiae. Of the 10,426 genes in An. gambiae, 1,946 genes (18.7%) were predicted to be Cellular Essential Genes (CEGs), 1716 (16.5%) to be Organism Essential Genes (OEGs), and 852 genes (8.2%) to be essential as both OEGs and CEGs. RNA interference (RNAi) was used to validate the top three highly expressed non-ribosomal predictions as probable vector control targets, by determining the effect of these genes on the survival of An. gambiae G3 mosquitoes. In addition, the effect of knockdown of arginase (AGAP008783) on Plasmodium berghei infection in mosquitoes was evaluated, an enzyme we computationally inferred earlier to be essential based on chokepoint analysis. Arginase and the top three genes, AGAP007406 (Elongation factor 1-alpha, Elf1), AGAP002076 (Heat shock 70kDa protein 1/8, HSP), AGAP009441 (Elongation factor 2, Elf2), had knockdown efficiencies of 91%, 75%, 63%, and 61%, respectively. While knockdown of HSP or Elf2 significantly reduced longevity of the mosquitoes (p<0.0001) compared to control groups, Elf1 or arginase knockdown had no effect on survival. However, arginase knockdown significantly reduced P. berghei oocytes counts in the midgut of mosquitoes when compared to LacZ-injected controls. The study reveals HSP and Elf2 as important contributors to mosquito survival and arginase as important for parasite development, hence placing them as possible targets for vector control.

Animals↗
PubMed2026

Adenoviral Vectors in Gene Therapy: A Detailed Overview.

Adenoviral vectors (AdVs) represent one of the most extensively researched platforms in the realm of gene therapy, providing advantages such as high transduction efficiency, large transgene capacity, and broad tropism. This review provides a detailed and structured overview of AdVs, highlighting their biology, gene delivery mechanisms, clinical applications, and challenges limiting their broader therapeutic applicability. The study also explores recent progress in vector engineering, such as rare serotypes, capsid modifications, third-generation vectors, as well as strategies for immune modulation and toxicity reduction. AdVs are used in therapies for genetic disorders, oncology, and vaccinology, alongside innovations such as CRISPR-Cas9, nanotechnology, and artificial intelligence design. Nevertheless, persistent hurdles, including vector immunogenicity, hepatotoxicity, scalability, and the lack of durable expression, prevent widespread clinical use. This review consolidates current knowledge and presents a future perspective on how AdVs may evolve as powerful, adaptable, and precise tools in modern gene therapy. By contextualizing strengths and unresolved challenges, this work aims to give researchers and clinicians a balanced foundation for evaluating their future roles in translational medicine.

Humans↗
PubMed2025

Spatial and longitudinal tracking of enhancer-AAV vectors that target transgene expression to injured mouse myocardium.

Tissue regeneration enhancer elements (TREEs) direct expression of target genes in injured and regenerating tissues. Additionally, TREEs of zebrafish origin were shown to direct expression of transgenes in border zone regions after cardiac injury when packaged into recombinant adeno-associated viral (AAV) vectors and introduced into mice. Future implementation of TREEs into AAV-based vectors as research tools and potential gene therapy modalities requires a deeper understanding of expression dynamics and potential off-target effects. Here, we applied in vivo bioluminescent imaging to mice systemically injected with AAV vectors containing different combinations of capsids, enhancers, and timing of delivery. Longitudinal tracking of expression directed by different TREEs revealed distinct amplitudes and durations of reporter gene expression in the injured heart. The liver-de-targeted AAV capsid, AAV.cc84, could deliver TREEs either pre- or post-cardiac injury to negate off-target expression in the liver while maintaining transduction in the heart. By screening AAV9-based capsid libraries dosed systemically in mice post-cardiac injury, we discovered a new capsid variant, AAV.IR41, with enhanced transduction in cardiac injuries and with elevated transduction of TREE-driven transgenes versus conventional AAV9 vectors. In vivo bioluminescence imaging offers insights into how enhancers and engineered capsids can be implemented to modulate spatiotemporal transgene expression for targeted therapies.

Animals↗
PubMed1979

Discriminant analysis: a method of identifying foci of vector-borne diseases.

Identification of foci of vector-borne diseases does not require knowledge of exact abundances of vectors and pathogens; rather, a focus is defined by the presence, or some minimal level of abundance, of a vector and pathogen. Stepwise discriminant analysis (DA) was applied to data on free-ranging adult wood ticks (the vector) and to data on isolations of Colorado tick fever virus from small mammals. Trap stations were grouped on the basis of relative abundance of wood ticks for one set of analyses and on the presence or absence of virus for another set of analyses. Additional data consisted of easily measured environmental variables. It is concluded that DA provides a useful tool for analysis of ecosystem structure and an effective means of identifying foci of infection.

Animals↗
PubMed1979

Vectors of dengue fever/dengue haemorrhagic fever with advances in their control.

The most important vector of dengue in the Western Pacific Region is Ae. aegypti. On some occasions, Ae. albopictus, Ae. polynesiensis and several other species of the Ae. scutellaris complex have been suspected vectors in localities where Ae. aegypti was not found. Long-term vector control by the use of insecticides has been expensive and difficult to achieve. However, spray equipment and ULV insecticides have been obtained in many places for emergency use during outbreaks, and Abate larviciding also has been used in high-risk localities to help prevent outbreaks. Obtaining greater community participation supported by intensified health education and other acceptable measures is considered an important approach for achieving improved long-term control. Developing an acceptable and effective cover for domestic water storage containers is also recognized as a potentially important tool for suppressing vector populations.

Aedes↗