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Fani Maleki A, Sekhavati MH. Application of phiC31 integrase system in stem cells biology and technology: a review. FRONTIERS IN LIFE SCIENCE 2018. [DOI: 10.1080/21553769.2018.1447516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Adham Fani Maleki
- Embryonic and Stem Cell Biology and Biotechnology Research Group, Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohammad Hadi Sekhavati
- Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
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Halder UC. Bone marrow stem cells to destroy circulating HIV: a hypothetical therapeutic strategy. ACTA ACUST UNITED AC 2018; 25:3. [PMID: 29445623 PMCID: PMC5800069 DOI: 10.1186/s40709-018-0075-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Accepted: 01/27/2018] [Indexed: 12/19/2022]
Abstract
Human immunodeficiency virus (HIV) still poses enigmatic threats to human life. This virus has mastered in bypassing anti retroviral therapy leading to patients’ death. Circulating viruses are phenomenal for the disease outcome. This hypothesis proposes a therapeutic strategy utilizing receptor-integrated hematopoietic, erythroid and red blood cells. Here, HIV specific receptors trap circulating viruses that enter erythrocyte cytoplasm and form inactive integration complex. This model depicts easy, effective removal of circulating HIV without any adverse effect.
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Affiliation(s)
- Umesh Chandra Halder
- Department of Zoology, Raniganj Girls' College, Searsole, Rajbari, Raniganj, Paschim Barddhaman, West Bengal 713358 India
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Aravalli RN, Belcher JD, Steer CJ. Liver-targeted gene therapy: Approaches and challenges. Liver Transpl 2015; 21:718-37. [PMID: 25824605 PMCID: PMC9353592 DOI: 10.1002/lt.24122] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Revised: 03/06/2015] [Accepted: 03/14/2015] [Indexed: 12/15/2022]
Abstract
The liver plays a major role in many inherited and acquired genetic disorders. It is also the site for the treatment of certain inborn errors of metabolism that do not directly cause injury to the liver. The advancement of nucleic acid-based therapies for liver maladies has been severely limited because of the myriad untoward side effects and methodological limitations. To address these issues, research efforts in recent years have been intensified toward the development of targeted gene approaches using novel genetic tools, such as zinc-finger nucleases, transcription activator-like effector nucleases, and clustered regularly interspaced short palindromic repeats as well as various nonviral vectors such as Sleeping Beauty transposons, PiggyBac transposons, and PhiC31 integrase. Although each of these methods uses a distinct mechanism of gene modification, all of them are dependent on the efficient delivery of DNA and RNA molecules into the cell. This review provides an overview of current and emerging therapeutic strategies for liver-targeted gene therapy and gene repair.
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Affiliation(s)
- Rajagopal N. Aravalli
- Department of Radiology, University of Minnesota Medical School, Minneapolis, MN 54455
| | - John D. Belcher
- Department of Medicine, University of Minnesota Medical School, Minneapolis, MN 54455
| | - Clifford J. Steer
- Department of Medicine, University of Minnesota Medical School, Minneapolis, MN 54455,Genetics, Cell Biology and Development, University of Minnesota Medical School, Minneapolis, MN 54455
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Bertino P, Urschitz J, Hoffmann FW, You BR, Rose AH, Park WH, Moisyadi S, Hoffmann PR. Vaccination with a piggyBac plasmid with transgene integration potential leads to sustained antigen expression and CD8(+) T cell responses. Vaccine 2014; 32:1670-7. [PMID: 24513010 DOI: 10.1016/j.vaccine.2014.01.063] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 01/20/2014] [Accepted: 01/22/2014] [Indexed: 12/28/2022]
Abstract
DNA vaccination with plasmid has conventionally involved vectors designed for transient expression of antigens in injected tissues. Next generation plasmids are being developed for site-directed integration of transgenes into safe sites in host genomes and may provide an innovative approach for stable and sustained expression of antigens for vaccination. The goal of this study was to evaluate in vivo antigen expression and the generation of cell mediated immunity in mice injected with a non-integrating plasmid compared to a plasmid with integrating potential. Hyperactive piggyBac transposase-based integrating vectors (pmhyGENIE-3) contained a transgene encoding either eGFP (pmhyGENIE-3-eGFP) or luciferase (pmhyGENIE-3-GL3), and were compared to transposase-deficient plasmids with the same transgene and DNA backbone. Both non-integrating and integrating plasmids were equivalent at day 1 for protein expression at the site of injection. While protein expression from the non-integrating plasmid was lost by day 14, the pmhyGENIE-3 was found to exhibit sustained protein expression up to 28 days post-injection. Vaccination with pmhyGENIE-3-eGFP resulted in a robust CD8(+) T cell response that was three-fold higher than that of non-integrating plasmid vaccinations. Additionally we observed in splenocyte restimulation experiments that only the vaccination with pmhyGENIE-3-eGFP was characterized by IFNγ producing CD8(+) T cells. Overall, these findings suggest that plasmids designed to direct integration of transgenes into the host genome are a promising approach for designing DNA vaccines. Robust cell mediated CD8(+) T cell responses generated using integrating plasmids may provide effective, sustained protection against intracellular pathogens or tumor antigens.
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Affiliation(s)
- Pietro Bertino
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA.
| | - Johann Urschitz
- Department of Anatomy, Biochemistry and Physiology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA
| | - Fukun W Hoffmann
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA
| | - Bo Ra You
- Department of Physiology, Medical School, Chonbuk National University, Jeonju, South Korea
| | - Aaron H Rose
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA
| | - Woo Hyun Park
- Department of Physiology, Medical School, Chonbuk National University, Jeonju, South Korea
| | - Stefan Moisyadi
- Department of Anatomy, Biochemistry and Physiology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA; Manoa BioSciences, Honolulu, HI 96822, USA
| | - Peter R Hoffmann
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, USA
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Robert MA, Zeng Y, Raymond B, Desfossé L, Mairey E, Tremblay JP, Massie B, Gilbert R. Efficacy and site-specificity of adenoviral vector integration mediated by the phage φC31 integrase. Hum Gene Ther Methods 2013. [PMID: 23194172 DOI: 10.1089/hgtb.2012.122] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Adenoviral vectors deleted of all their viral genes (helper-dependent [HD]) are efficient gene-transfer vehicles. Because transgene expression is rapidly lost in actively dividing cells, we investigated the feasibility of using phage φC31 integrase (φC31-Int) to integrate an HD carrying an attB site and the puromycin resistance gene into human cells (HeLa) and murine myoblasts (C2C12) by co-infection with a second HD-expressing φC31-Int. Because the HD genome is linear, we also investigated whether its circularization, through expression of Cre using a third HD, affects integration. Efficacy and specificity were determined by scoring the number of puromycin-resistant colonies and by sequencing integration sites. Unexpectedly, circularization of HD was unnecessary and it even reduced the integration efficacy. The maximum integration efficacy achieved was 0.5% in HeLa cells and 0.1% in C2C12 myoblasts. Up to 76% of the integration events occurred at pseudo attP sites and previously characterized hotspots were found. A small (two- to three-fold) increase in the number of γ-H2AX positive foci, accompanied by no noticeable change in γ-H2AX expression, indicated the low genotoxicity of φC31-Int. In conclusion, integration of HD mediated by φC31-Int is an attractive alternative to engineer cells, because it permits site-specific integration of large DNA fragments with low genotoxicity.
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Affiliation(s)
- Marc-André Robert
- Biotechnology Research Institute, National Research Council Canada, Montréal, Canada, H4P 2R2
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Urschitz J, Moisyadi S. Transpositional transgenesis with piggyBac.. Mob Genet Elements 2013; 3:e25167. [PMID: 23956948 PMCID: PMC3742596 DOI: 10.4161/mge.25167] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 05/23/2013] [Accepted: 05/24/2013] [Indexed: 02/08/2023] Open
Abstract
Transposons are mobile genetic elements that are capable of self-directed excision and subsequent reintegration within the host genome. Transposase such as piggyBac, Sleeping Beauty and Tol2 catalyze these reactions and have shown potential as tools for the stable integration of transgenes when used in the binary plasmid mode. Recent modifications to the transposase and/or the terminal repeats of the transposon have increased their integration efficiency and/or specificity. We recently described the development of a piggyBac transposase system, the helper independent, single construct self-inactivating plasmid called GENIE. Here we describe the structure, safety and function of these transpositional vectors and their use in animal transgenesis and cell transfection.
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Affiliation(s)
- Johann Urschitz
- Department of Anatomy, Biochemistry and Physiology; John A. Burns School of Medicine; Honolulu, HI USA
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