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Marques-da-Silva C, Peissig K, Walker MP, Shiau J, Bowers C, Kyle DE, Vijay R, Lindner SE, Kurup SP. Direct type I interferon signaling in hepatocytes controls malaria. Cell Rep 2022; 40:111098. [PMID: 35858541 PMCID: PMC9422951 DOI: 10.1016/j.celrep.2022.111098] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 04/13/2022] [Accepted: 06/23/2022] [Indexed: 11/17/2022] Open
Abstract
Malaria is a devastating disease impacting over half of the world’s population. Plasmodium parasites that cause malaria undergo obligatory development and replication in hepatocytes before infecting red blood cells and initiating clinical disease. While type I interferons (IFNs) are known to facilitate innate immune control to Plasmodium in the liver, how they do so has remained unresolved, precluding the manipulation of such responses to combat malaria. Utilizing transcriptomics, infection studies, and a transgenic Plasmodium strain that exports and traffics Cre recombinase, we show that direct type I IFN signaling in Plasmodium-infected hepatocytes is necessary to control malaria. We also show that the majority of infected hepatocytes naturally eliminate Plasmodium infection, revealing the potential existence of anti-malarial cell-autonomous immune responses in such hepatocytes. These discoveries challenge the existing paradigms in Plasmodium immunobiology and are expected to inspire anti-malarial drugs and vaccine strategies. Utilizing a transgenic Plasmodium strain expressing Cre recombinase that selectively ablates type I IFN receptor in only the infected hepatocytes, Marques-da-Silva et al. show that direct type I IFN signaling in the infected hepatocytes is both necessary and sufficient to control liver-stage malaria.
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Affiliation(s)
- Camila Marques-da-Silva
- Department of Cellular Biology, University of Georgia, Athens, GA, USA; Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA, USA
| | - Kristen Peissig
- Department of Cellular Biology, University of Georgia, Athens, GA, USA; Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA, USA
| | - Michael P Walker
- Department of Biochemistry and Molecular Biology, The Huck Center for Malaria Research, Pennsylvania State University, University Park, PA, USA
| | - Justine Shiau
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA, USA; Department of Infectious Diseases, University of Georgia, Athens, GA, USA
| | - Carson Bowers
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA, USA
| | - Dennis E Kyle
- Department of Cellular Biology, University of Georgia, Athens, GA, USA; Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA, USA; Department of Infectious Diseases, University of Georgia, Athens, GA, USA
| | - Rahul Vijay
- Center for Cancer Cell Biology, Immunology and Infection, Rosalind Franklin University of Medicine and Science, North Chicago, IL, USA
| | - Scott E Lindner
- Department of Biochemistry and Molecular Biology, The Huck Center for Malaria Research, Pennsylvania State University, University Park, PA, USA
| | - Samarchith P Kurup
- Department of Cellular Biology, University of Georgia, Athens, GA, USA; Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA, USA.
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Wang F, Ji YT, Tian C, Wang YC, Xu S, Wang RY, Yang QQ, Zhao P, Xia QY. An inducible constitutive expression system in Bombyx mori mediated by phiC31 integrase. INSECT SCIENCE 2021; 28:1277-1289. [PMID: 32803790 DOI: 10.1111/1744-7917.12866] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 08/05/2020] [Accepted: 08/07/2020] [Indexed: 06/11/2023]
Abstract
Inducible gene-expression systems play important roles in gene functional assays in the post-genome era. Streptomyces phage-derived phiC31 integrase, which mediates an irreversible site-specific cassette exchange between the phage attachment site (attP) and the bacterial attachment site (attB), provides a promising option for the construction of a controllable gene-expression system. Here, we report a phiC31 integrase-mediated promoter flip system (FLIP) for the inducible expression of target genes in silkworm (Bombyx mori). First, we constructed a FLIP reporter system, in which a BmAct4 promoter with enhanced translational efficiency was flanked by the attB and attP sites in a head-to-head orientation and further linked in a reverse orientation to a DsRed reporter gene. The coexpression of a C-terminal modified phiC31-NLS integrase carrying a simian virus 40 (SV40) nuclear localization signal (NLS) effectively flipped the BmAct4 promoter through an attB/attP exchange, thereby activating the downstream expression of DsRed in a silkworm embryo-derived cell line, BmE. Subsequently, the FLIP system, together with a system continuously expressing the phiC31-NLS integrase, was used to construct binary transgenic silkworm lines. Hybridization between FLIP and phiC31-NLS transgenic silkworm lines resulted in the successful flipping of the BmAct4 promoter, with an approximately 39% heritable transformation efficiency in silkworm offspring, leading to the constitutive and high-level expression of DsRed in silkworms, which accounted for approximately 0.81% of the silkworm pupal weight. Our successful development of the FLIP system offers an effective alternative for manipulating gene expression in silkworms and other lepidopteran species.
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Affiliation(s)
- Feng Wang
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Biological Science Research Center, Southwest University, Chongqing, China
| | - Yan-Ting Ji
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Biological Science Research Center, Southwest University, Chongqing, China
| | - Chi Tian
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Biological Science Research Center, Southwest University, Chongqing, China
| | - Yuan-Cheng Wang
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Biological Science Research Center, Southwest University, Chongqing, China
| | - Shen Xu
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Biological Science Research Center, Southwest University, Chongqing, China
| | - Ri-Yuan Wang
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Biological Science Research Center, Southwest University, Chongqing, China
| | - Qian-Qian Yang
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Biological Science Research Center, Southwest University, Chongqing, China
| | - Ping Zhao
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Biological Science Research Center, Southwest University, Chongqing, China
| | - Qing-You Xia
- State Key Laboratory of Silkworm Genome Biology, Chongqing Engineering and Technology Research Center for Novel Silk Materials, Biological Science Research Center, Southwest University, Chongqing, China
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Qu L, Wang L, Zhu X, Zhang Y, Ou Q, Ma A, Sheng F, Wei X, Dai Y, Li G, Xie S. Global mapping of binding sites for phic31 integrase in transgenic maden-darby bovine kidney cells using ChIP-seq. Hereditas 2019; 156:3. [PMID: 30675136 PMCID: PMC6332687 DOI: 10.1186/s41065-018-0079-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 12/25/2018] [Indexed: 11/22/2022] Open
Abstract
Background ΦC31 integrase, a site-specific recombinase, can efficiently target attB-bearing transgenes to endogenous pseudo attP sites within mammalian genomes. The sequence features of endogenous binding sites will help us to fully understand the site-specific recognition function by ΦC31 integrase. The present study was aimed to uncover the global map of ΦC31 integrase binding sites in bovine cells and analysis the features of these binding sites by comprehensive bioinformatics methods. Results In this study, we constructed a ChIP-seq method that can be used to uncover the global binding sites by phiC31 integrase. 6740 potential ΦC31 integrase binding sites were identified. A sequence motif was found that contains inverted repeats and has similarities to wild-type attP site. Using REPEATMASKER, we identified a total of 20,183 repeat-regions distributed in 50 repeat types for the 6740 binding sites. These sites enriched in “regulation of GTPase activity” of in the GO category of biological process and KEGG pathway of signal transmembrane transporter activity. Conclusion This study is the first time to uncover the global map of binding sites for ΦC31 integrase using ChIP-sequencing method and analysis the features of these binding sites. This method will help us to fully understand the mechanism of the site-specific integration function by phiC31 integrase and will potentially boost its genetic manipulations in both gene therapy and generation of transgenic animals. Electronic supplementary material The online version of this article (10.1186/s41065-018-0079-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lijuan Qu
- Department of Laboratory Medicine, Shanghai Eighth People's Hospital, Shanghai, 200040 China
| | - Lei Wang
- Department of Laboratory Medicine, Shanghai Eighth People's Hospital, Shanghai, 200040 China
| | - Xueyuan Zhu
- Department of Laboratory Medicine, Shanghai Eighth People's Hospital, Shanghai, 200040 China
| | - Yan Zhang
- Department of Laboratory Medicine, Shanghai Eighth People's Hospital, Shanghai, 200040 China
| | - Qiang Ou
- Department of Laboratory Medicine, Shanghai Eighth People's Hospital, Shanghai, 200040 China
| | - Aying Ma
- Department of Respiratory Medicine, Shanghai First People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, 201620 China
| | - Fengying Sheng
- Department of Laboratory Medicine, Shanghai Eighth People's Hospital, Shanghai, 200040 China
| | - Xiaoqing Wei
- Department of Laboratory Medicine, Shanghai Eighth People's Hospital, Shanghai, 200040 China
| | - Yue Dai
- Department of Laboratory Medicine, Shanghai Eighth People's Hospital, Shanghai, 200040 China
| | - Guoting Li
- Lab of Reproductive Pharmacology, NHC Key Lab of Reproduction Regulation, Shanghai Institute of Planned Parenthood Research, Fudan University, Shanghai, 200032 China
| | - Shuwu Xie
- Lab of Reproductive Pharmacology, NHC Key Lab of Reproduction Regulation, Shanghai Institute of Planned Parenthood Research, Fudan University, Shanghai, 200032 China
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Woodard LE, Cheng J, Welch RC, Williams FM, Luo W, Gewin LS, Wilson MH. Kidney-specific transposon-mediated gene transfer in vivo. Sci Rep 2017; 7:44904. [PMID: 28317878 PMCID: PMC5357952 DOI: 10.1038/srep44904] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 02/14/2017] [Indexed: 12/18/2022] Open
Abstract
Methods enabling kidney-specific gene transfer in adult mice are needed to develop new therapies for kidney disease. We attempted kidney-specific gene transfer following hydrodynamic tail vein injection using the kidney-specific podocin and gamma-glutamyl transferase promoters, but found expression primarily in the liver. In order to achieve kidney-specific transgene expression, we tested direct hydrodynamic injection of a DNA solution into the renal pelvis and found that luciferase expression was strong in the kidney and absent from extra-renal tissues. We observed heterogeneous, low-level transfection of the collecting duct, proximal tubule, distal tubule, interstitial cells, and rarely glomerular cells following injection. To assess renal injury, we performed the renal pelvis injections on uninephrectomised mice and found that their blood urea nitrogen was elevated at two days post-transfer but resolved within two weeks. Although luciferase expression quickly decreased following renal pelvis injection, the use of the piggyBac transposon system improved long-term expression. Immunosuppression with cyclophosphamide stabilised luciferase expression, suggesting immune clearance of the transfected cells occurs in immunocompetent animals. Injection of a transposon expressing erythropoietin raised the haematocrit, indicating that the developed injection technique can elicit a biologic effect in vivo. Hydrodynamic renal pelvis injection enables transposon mediated-kidney specific gene transfer in adult mice.
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Affiliation(s)
- Lauren E Woodard
- Department of Veterans Affairs, Nashville, TN 37212 USA.,Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232 USA.,Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
| | - Jizhong Cheng
- Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA
| | - Richard C Welch
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232 USA
| | - Felisha M Williams
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232 USA
| | - Wentian Luo
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232 USA
| | - Leslie S Gewin
- Department of Veterans Affairs, Nashville, TN 37212 USA.,Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232 USA.,Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232 USA
| | - Matthew H Wilson
- Department of Veterans Affairs, Nashville, TN 37212 USA.,Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232 USA.,Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA.,Department of Cell and Developmental Biology, Vanderbilt University Medical Center, Nashville, TN 37232 USA.,Department of Pharmacology, Vanderbilt University Medical Center, Nashville, TN 37232 USA.,Department of Veterans Affairs, Houston, TX 77030 USA
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Anderson CD, Moisyadi S, Avelar A, Walton CB, Shohet RV. Ultrasound-targeted hepatic delivery of factor IX in hemophiliac mice. Gene Ther 2016; 23:510-9. [PMID: 26960037 PMCID: PMC4891223 DOI: 10.1038/gt.2016.23] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 01/27/2016] [Accepted: 02/01/2016] [Indexed: 01/16/2023]
Abstract
Ultrasound-targeted microbubble destruction (UTMD) was used to direct the delivery of plasmid and transposase-based vectors encoding human factor IX (hFIX) to the livers of hemophilia B (FIX−/−) mice. The DNA vectors were incorporated into cationic lipid microbubbles, injected intravenously, and transfected into hepatocytes by acoustic cavitation of the bubbles as they transited the liver. Ultrasound parameters were identified that produced transfection of hepatocytes in vivo without substantial damage or bleeding in the livers of the FIX-deficient mice. These mice were treated with a conventional expression plasmid, or one containing a piggyBac transposon construct, and hFIX levels in the plasma and liver were evaluated at multiple time points after UTMD. We detected hFIX in the plasma by western blotting from mice treated with either plasmid during the 12 days after UTMD, and in the hepatocytes of treated livers by immunofluorescence. Reductions in clotting time and improvements in the percentage of FIX activity were observed for both plasmids, conventional (4.15±1.98%), and transposon based (2.70±.75%), 4 to 5 days after UTMD compared with untreated FIX (−/−) control mice (0.92±0.78%) (P=0.001 and P=0.012, respectively). Reduced clotting times persisted for both plasmids 12 days after treatment (reflecting percentage FIX activity of 3.12±1.56%, P=0.02 and 3.08±0.10%, P=0.001, respectively). Clotting times from an additional set of mice treated with pmGENIE3-hFIX were evaluated for long-term effects and demonstrated a persistent reduction in average clotting time 160 days after a single treatment. These data suggest that UTMD could be a minimally invasive, nonviral approach to enhance hepatic FIX expression in patients with hemophilia.
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Affiliation(s)
- C D Anderson
- Department of Cellular and Molecular Biology, John A. Burns School of Medicine, Honolulu, HI, USA
| | - S Moisyadi
- Department of Anatomy, Biochemistry and Physiology, John A. Burns School of Medicine, Honolulu, HI, USA
| | - A Avelar
- Department of Medicine, John A. Burns School of Medicine, Honolulu, HI, USA
| | - C B Walton
- Department of Medicine, John A. Burns School of Medicine, Honolulu, HI, USA
| | - R V Shohet
- Department of Medicine, John A. Burns School of Medicine, Honolulu, HI, USA
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Monocytes promote liver carcinogenesis in an oncogene-specific manner. J Hepatol 2016; 64:881-90. [PMID: 26639397 PMCID: PMC4799762 DOI: 10.1016/j.jhep.2015.11.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 10/19/2015] [Accepted: 11/11/2015] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS The leukocyte composition of tumors is heterogeneous, as is the involvement of each leukocyte subset in promoting or restraining tumorigenesis. This heterogeneity reflects the tissue of origin, tumor stage, and the functional state of leukocyte activation, but its biological roots remain poorly understood. Since tumorigenesis is driven by various genetic events, we assessed the role of driver genes in shaping the profiles and the roles of leukocytes in tumorigenesis. METHODS Mouse liver tumors were induced by hepatic overexpression of either MYC or the combination of myristoylated AKT and NRAS(V12) oncogenes via hydrodynamic transfection. A comparative, flow cytometry- and histology-based immunophenotyping of liver-infiltrating leukocytes was performed at various stages of liver tumorigenesis. The roles of the most abundant leukocyte subsets in tumorigenesis were addressed by immunodepletion. The contribution of liver injury was assessed by comparing the injury-inducing hydrodynamic transfection model to a model in which MYC is an inducible transgene. RESULTS Myristoylated AKT and NRAS(V12) promoted a marked recruitment of CD11b(+)Ly6G(hi)Ly6C(int) neutrophils and CD11b(+)Ly6G(-)Ly6C(hi) monocytes to the liver, but their immunodepletion did not alter tumorigenesis. In contrast, despite minimal invasion by monocytes/neutrophils during MYC-driven tumorigenesis, immunodepletion of these cells reduced MYC tumor burden and extended survival. MYC-driven tumor initiation was augmented specifically by Ly6C+ monocytes and their ability to promote liver injury. CONCLUSIONS Our results demonstrate that leukocyte profiles do not necessarily predict their involvement in tumorigenesis, the functional role of leukocytes can be shaped by oncogenes, and that monocyte-dependent tissue injury selectively cooperates with MYC during tumorigenesis.
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Improved site-specific recombinase-based method to produce selectable marker- and vector-backbone-free transgenic cells. Sci Rep 2014; 4:4240. [PMID: 24577484 PMCID: PMC3937794 DOI: 10.1038/srep04240] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Accepted: 02/06/2014] [Indexed: 12/30/2022] Open
Abstract
PhiC31 integrase-mediated gene delivery has been extensively used in gene therapy and animal transgenesis. However, random integration events are observed in phiC31-mediated integration in different types of mammalian cells; as a result, the efficiencies of pseudo attP site integration and evaluation of site-specific integration are compromised. To improve this system, we used an attB-TK fusion gene as a negative selection marker, thereby eliminating random integration during phiC31-mediated transfection. We also excised the selection system and plasmid bacterial backbone by using two other site-specific recombinases, Cre and Dre. Thus, we generated clean transgenic bovine fetal fibroblast cells free of selectable marker and plasmid bacterial backbone. These clean cells were used as donor nuclei for somatic cell nuclear transfer (SCNT), indicating a similar developmental competence of SCNT embryos to that of non-transgenic cells. Therefore, the present gene delivery system facilitated the development of gene therapy and agricultural biotechnology.
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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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González-Prieto C, Agúndez L, Linden RM, Llosa M. HUH site-specific recombinases for targeted modification of the human genome. Trends Biotechnol 2013; 31:305-12. [PMID: 23545167 DOI: 10.1016/j.tibtech.2013.02.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 02/27/2013] [Accepted: 02/27/2013] [Indexed: 11/16/2022]
Abstract
Site-specific recombinases (SSRs) have been crucial in the development of mammalian transgenesis. For gene therapy purposes, this approach remains challenging, because, for example, SSR delivery is largely unresolved and SSR DNA substrates must pre-exist in target cells. In this review, we discuss the potential of His-hydrophobic-His (HUH) recombinases to overcome some of the limitations of conventional SSRs. Members of the HUH protein family cleave single-stranded (ss)DNA, but can mediate site-specific integration with the aid of the host replication machinery. Adeno-associated virus (AAV) Rep remains the only known example to support site-specific integration in human cells, and AAV is an excellent gene delivery vector that can be targeted to specific cells and organelles. Bacterial protein TrwC catalyzes integration into human sequences and can be delivered to human cells covalently linked to DNA, offering attractive new features for targeted genome modification.
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Affiliation(s)
- Coral González-Prieto
- Departamento de Biología Molecular (Universidad de Cantabria) and IBBTEC (UC, CSIC, SODERCAN), Santander, Spain
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Qu L, Ma Q, Zhou Z, Ma H, Huang Y, Huang S, Zeng F, Zeng Y. A profile of native integration sites used by φC31 integrase in the bovine genome. J Genet Genomics 2012; 39:217-24. [PMID: 22624883 DOI: 10.1016/j.jgg.2012.03.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Revised: 03/07/2012] [Accepted: 03/30/2012] [Indexed: 11/24/2022]
Abstract
The Streptomyces phage φC31 integrase can efficiently target attB-bearing transgenes to endogenous pseudo attP sites within mammalian genomes. To better understand the activity of φC31 integrase in the bovine genome, DNA sequences of 44 integration events were analyzed, and 32 pseudo attP sites were identified. The majority of these sites share a sequence motif that contains inverted repeats and has similarities to wild-type attP site. Genomic DNA flanking these sites typically contained repetitive sequence elements, such as short and long interspersed repetitive elements. These sequence features indicate that DNA sequence recognition plays an important role in guiding φC31-mediated site-specific integration. In addition, BF27 integration hotspot sites were identified in the bovine genome, which accounted for 13.6% of all isolated integration events and mapped to an intron of the deleted in liver cancer 1 (DLC1) gene. Also we found that the pseudo attP sites in the bovine genome had other features in common with those in the human genome. This study represents the first time that the sequence features of pseudo attP sites in the bovine genome were analyzed. We conclude that this site-specific integrase system has great potential for applied modifications of the bovine genome.
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Affiliation(s)
- Lijuan Qu
- Shanghai Institute of Medical Genetics, Children's Hospital of Shanghai, Shanghai Jiao Tong University School of Medicine, 24/1400 West Beijing Road, Shanghai 200040, China
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Umemoto Y, Kawakami S, Otani Y, Higuchi Y, Yamashita F, Hashida M. Evaluation of Long-Term Gene Expression in Mouse Liver Using PhiC31 Integrase and Hydrodynamic Injection. Biol Pharm Bull 2012; 35:1182-6. [DOI: 10.1248/bpb.b12-00083] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Yoshiaki Umemoto
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University
| | - Shigeru Kawakami
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University
| | - Yuki Otani
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University
| | - Yuriko Higuchi
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University
| | - Fumiyoshi Yamashita
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University
| | - Mitsuru Hashida
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University
- Institute for Integrated Cell-Material Sciences, Kyoto University
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Turan S, Bode J. Site‐specific recombinases: from tag‐and‐target‐ to tag‐and‐exchange‐based genomic modifications. FASEB J 2011; 25:4088-107. [DOI: 10.1096/fj.11-186940] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Soeren Turan
- Institute for Experimental Hematology, Hannover Medical School Hannover Germany
| | - Juergen Bode
- Institute for Experimental Hematology, Hannover Medical School Hannover Germany
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Karow M, Calos MP. The therapeutic potential of ΦC31 integrase as a gene therapy system. Expert Opin Biol Ther 2011; 11:1287-96. [PMID: 21736536 DOI: 10.1517/14712598.2011.601293] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
INTRODUCTION The φC31 integrase system is a phage-derived system that offers the ability to integrate plasmid DNA into the chromosomes at a subset of endogenous preferred locations associated with robust gene expression. Recent progress highlights the unique advantages of this system for in vivo gene therapy and for use in stem cells. AREAS COVERED The φC31 integrase system has been under development for ten years and has been demonstrated to be effective for integration of plasmids in a variety of tissues and organs for gene therapy in animal systems, as well as in isolated human cells. We focus on work with the φC31 integrase system during the past 12-18 months. This work has centered on a series of papers involving in vivo delivery of the integrase system to the liver and a variety of studies demonstrating the utility of the integrase system in stem cells. EXPERT OPINION We conclude that the φC31 integrase system has significant potential for liver gene therapy, if effective DNA delivery methods for large mammals become available. The φC31 integrase system displays an outstanding fit for use in pluripotent stem cells, and this area is expected to be the subject of intense development.
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Affiliation(s)
- Marisa Karow
- Stanford University School of Medicine, Department of Genetics, Stanford, CA 94305-5120, USA
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15
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Ma QW. [Progress of φC31 integrase system in site-specific integration]. YI CHUAN = HEREDITAS 2011; 33:567-75. [PMID: 21684861 DOI: 10.3724/sp.j.1005.2011.00567] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Integrase of phage fC31 catalyses the homologous recombination between Streptomyces attachment site attB and the phage attachment site attP. Meanwhile, this integrase can mediate integration of attB-containing donor plasmids into the pseudo attP sites in eukaryotic genomes by a site-specific manner and resulting long-term and robust expression of integrated genes. Nowadays, fC31 integrase system is becoming a potential tool for genome modification, gene therapy and transgenic research. Recent progress of fC31 integrase system in integration mode in mammalian genomes, efficiency improvement and researches concerned on transgenic safety were summarized in this review.
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Affiliation(s)
- Qing-Wen Ma
- Children's Hospital of Shanghai, Institute of Medical Genetics, Shanghai JiaoTong University, Shanghai 200040, China.
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Chavez CL, Keravala A, Woodard LE, Hillman RT, Stowe TR, Chu JN, Calos MP. Kinetics and longevity of ΦC31 integrase in mouse liver and cultured cells. Hum Gene Ther 2011; 21:1287-97. [PMID: 20497035 DOI: 10.1089/hum.2010.049] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The ΦC31 integrase system provides genomic integration of plasmid DNA that may be useful in gene therapy. For example, the ΦC31 system has been used in combination with hydrodynamic injection to achieve long-term expression of factor IX in mouse liver. However, a concern is that prolonged expression of ΦC31 integrase within cells could potentially stimulate chromosome rearrangements or an immune response. Western blot and immunofluorescence analyses were performed to investigate the duration of ΦC31 integrase expression in mouse liver. Integrase was expressed within 2 to 3 hr after hydrodynamic injection of a plasmid expressing ΦC31 integrase. Expression peaked between 8 and 16 hr and fell to background levels by 24-48 hr postinjection. Analysis of the amount of integrase plasmid DNA present in the liver over time suggested that the brief period of integrase expression could largely be accounted for by rapid loss of the bulk of the plasmid DNA, as well as by silencing of plasmid expression. PCR analysis of integration indicated that ΦC31 integrase carried out genomic integration of a codelivered attB-containing plasmid by 3 hr after plasmid injection. Integrase was expressed for longer times and at higher levels in transfected cultured cells compared with liver. Inhibitor studies suggested that the enzyme had a short half-life and was degraded by the 26S proteasome. The short duration of integrase expression in liver and rapid integration reaction appear to be features favorable for use in gene therapy.
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Affiliation(s)
- Christopher L Chavez
- Department of Genetics, Stanford University School of Medicine, Stanford, CA 94305, USA
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Impact of hydrodynamic injection and phiC31 integrase on tumor latency in a mouse model of MYC-induced hepatocellular carcinoma. PLoS One 2010; 5:e11367. [PMID: 20614008 PMCID: PMC2894073 DOI: 10.1371/journal.pone.0011367] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Accepted: 06/08/2010] [Indexed: 01/04/2023] Open
Abstract
Background Hydrodynamic injection is an effective method for DNA delivery in mouse liver and is being translated to larger animals for possible clinical use. Similarly, ϕC31 integrase has proven effective in mediating long-term gene therapy in mice when delivered by hydrodynamic injection and is being considered for clinical gene therapy applications. However, chromosomal aberrations have been associated with ϕC31 integrase expression in tissue culture, leading to questions about safety. Methodology/Principal Findings To study whether hydrodynamic delivery alone, or in conjunction with delivery of ϕC31 integrase for long-term transgene expression, could facilitate tumor formation, we used a transgenic mouse model in which sustained induction of the human C-MYC oncogene in the liver was followed by hydrodynamic injection. Without injection, mice had a median tumor latency of 154 days. With hydrodynamic injection of saline alone, the median tumor latency was significantly reduced, to 105 days. The median tumor latency was similar, 106 days, when a luciferase donor plasmid and backbone plasmid without integrase were administered. In contrast, when active or inactive ϕC31 integrase and donor plasmid were supplied to the mouse liver, the median tumor latency was 153 days, similar to mice receiving no injection. Conclusions/Significance Our data suggest that ϕC31 integrase does not facilitate tumor formation in this C-MYC transgenic mouse model. However, in groups lacking ϕC31 integrase, hydrodynamic injection appeared to contribute to C-MYC-induced hepatocellular carcinoma in adult mice. Although it remains to be seen to what extent these findings may be extrapolated to catheter-mediated hydrodynamic delivery in larger species, they suggest that caution should be used during translation of hydrodynamic injection to clinical applications.
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Abstract
Ocular gene therapy is becoming a well-established field. Viral gene therapies for the treatment of Leber's congentinal amaurosis (LCA) are in clinical trials, and many other gene therapy approaches are being rapidly developed for application to diverse ophthalmic pathologies. Of late, development of non-viral gene therapies has been an area of intense focus and one technology, polymer-compacted DNA nanoparticles, is especially promising. However, development of pharmaceutically and clinically viable therapeutics depends not only on having an effective and safe vector but also on a practical treatment strategy. Inherited retinal pathologies are caused by mutations in over 220 genes, some of which contain over 200 individual disease-causing mutations, which are individually very rare. This review will focus on both the progress and future of nanoparticles and also on what will be required to make them relevant ocular pharmaceutics.
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Affiliation(s)
- Shannon M Conley
- University of Oklahoma Health Sciences Center, Department of Cell Biology, BMSB 781, 940 Stanton L. Young Blvd, Oklahoma City, OK 73104, USA
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