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Shen D, Song C, Miskey C, Chan S, Guan Z, Sang Y, Wang Y, Chen C, Wang X, Müller F, Ivics Z, Gao B. A native, highly active Tc1/mariner transposon from zebrafish (ZB) offers an efficient genetic manipulation tool for vertebrates. Nucleic Acids Res 2021; 49:2126-2140. [PMID: 33638993 PMCID: PMC7913693 DOI: 10.1093/nar/gkab045] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 01/13/2021] [Accepted: 01/15/2021] [Indexed: 12/18/2022] Open
Abstract
New genetic tools and strategies are currently under development to facilitate functional genomics analyses. Here, we describe an active member of the Tc1/mariner transposon superfamily, named ZB, which invaded the zebrafish genome very recently. ZB exhibits high activity in vertebrate cells, in the range of those of the widely used transposons piggyBac (PB), Sleeping Beauty (SB) and Tol2. ZB has a similar structural organization and target site sequence preference to SB, but a different integration profile with respect to genome-wide preference among mammalian functional annotation features. Namely, ZB displays a preference for integration into transcriptional regulatory regions of genes. Accordingly, we demonstrate the utility of ZB for enhancer trapping in zebrafish embryos and in the mouse germline. These results indicate that ZB may be a powerful tool for genetic manipulation in vertebrate model species.
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Affiliation(s)
- Dan Shen
- College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China
- Division of Medical Biotechnology, Paul Ehrlich Institute, Langen 63225, Germany
| | - Chengyi Song
- College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Csaba Miskey
- Division of Medical Biotechnology, Paul Ehrlich Institute, Langen 63225, Germany
| | - Shuheng Chan
- College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Zhongxia Guan
- College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Yatong Sang
- College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Yali Wang
- College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Cai Chen
- College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Xiaoyan Wang
- College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Ferenc Müller
- Institute of Cancer and Genomic Sciences, Birmingham Centre for Genome Biology, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Zoltán Ivics
- Division of Medical Biotechnology, Paul Ehrlich Institute, Langen 63225, Germany
| | - Bo Gao
- College of Animal Science & Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China
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Li QV, Rosen BP, Huangfu D. Decoding pluripotency: Genetic screens to interrogate the acquisition, maintenance, and exit of pluripotency. WILEY INTERDISCIPLINARY REVIEWS. SYSTEMS BIOLOGY AND MEDICINE 2020; 12:e1464. [PMID: 31407519 PMCID: PMC6898739 DOI: 10.1002/wsbm.1464] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 05/31/2019] [Accepted: 07/17/2019] [Indexed: 01/25/2023]
Abstract
Pluripotent stem cells have the ability to unlimitedly self-renew and differentiate to any somatic cell lineage. A number of systems biology approaches have been used to define this pluripotent state. Complementary to systems level characterization, genetic screens offer a unique avenue to functionally interrogate the pluripotent state and identify the key players in pluripotency acquisition and maintenance, exit of pluripotency, and lineage differentiation. Here we review how genetic screens have helped us decode pluripotency regulation. We will summarize results from RNA interference (RNAi) based screens, discuss recent advances in CRISPR/Cas-based genetic perturbation methods, and how these advances have made it possible to more comprehensively interrogate pluripotency and differentiation through genetic screens. Such investigations will not only provide a better understanding of this unique developmental state, but may enhance our ability to use pluripotent stem cells as an experimental model to study human development and disease progression. Functional interrogation of pluripotency also provides a valuable roadmap for utilizing genetic perturbation to gain systems level understanding of additional cellular states, from later stages of development to pathological disease states. This article is categorized under: Developmental Biology > Stem Cell Biology and Regeneration Developmental Biology > Developmental Processes in Health and Disease Biological Mechanisms > Cell Fates.
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Affiliation(s)
- Qing V. Li
- Sloan Kettering Institute, 1275 York Avenue, New York, New York 10065, USA
- Louis V. Gerstner Jr. Graduate School of Biomedical Sciences, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
- These authors contributed equally
| | - Bess P. Rosen
- Sloan Kettering Institute, 1275 York Avenue, New York, New York 10065, USA
- Weill Graduate School of Medical Sciences at Cornell University, 1300 York Avenue, New York, New York 10065, USA
- These authors contributed equally
| | - Danwei Huangfu
- Sloan Kettering Institute, 1275 York Avenue, New York, New York 10065, USA
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Yamanishi A, Matsuba A, Kondo R, Akamatsu R, Tanaka S, Tokunaga M, Horie K, Kokubu C, Ishida Y, Takeda J. Collection of homozygous mutant mouse embryonic stem cells arising from autodiploidization during haploid gene trap mutagenesis. Nucleic Acids Res 2019; 46:e63. [PMID: 29554276 PMCID: PMC6007410 DOI: 10.1093/nar/gky183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 03/09/2018] [Indexed: 12/22/2022] Open
Abstract
Haploid mouse embryonic stem cells (ESCs), in which a single hit mutation is sufficient to produce loss-of-function phenotypes, have provided a powerful tool for forward genetic screening. This strategy, however, can be hampered by undesired autodiploidization of haploid ESCs. To overcome this obstacle, we designed a new methodology that facilitates enrichment of homozygous mutant ESC clones arising from autodiploidization during haploid gene trap mutagenesis. Haploid mouse ESCs were purified by fluorescence-activated cell sorting to maintain their haploid property and then transfected with the Tol2 transposon-based biallelically polyA-trapping (BPATrap) vector that carries an invertible G418 plus puromycin double selection cassette. G418 plus puromycin double selection enriched biallelic mutant clones that had undergone autodiploidization following a single vector insertion into the haploid genome. Using this method, we successfully generated 222 homozygous mutant ESCs from 2208 clones by excluding heterozygous ESCs and ESCs with multiple vector insertions. This relatively low efficiency of generating homozygous mutant ESCs was partially overcome by cell sorting of haploid ESCs after Tol2 BPATrap transfection. These results demonstrate the feasibility of our approach to provide an efficient platform for mutagenesis of ESCs and functional analysis of the mammalian genome.
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Affiliation(s)
- Ayako Yamanishi
- Department of Genome Biology, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
| | - Atsushi Matsuba
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Ryohei Kondo
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Rie Akamatsu
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Sachiyo Tanaka
- Department of Genome Biology, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
| | - Masahiro Tokunaga
- Department of Genome Biology, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
| | - Kyoji Horie
- Department of Physiology II, Nara Medical University, Kashihara, Nara 634-8521, Japan
| | - Chikara Kokubu
- Department of Genome Biology, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yasumasa Ishida
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Junji Takeda
- Department of Genome Biology, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
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Schumann GG, Fuchs NV, Tristán-Ramos P, Sebe A, Ivics Z, Heras SR. The impact of transposable element activity on therapeutically relevant human stem cells. Mob DNA 2019; 10:9. [PMID: 30899334 PMCID: PMC6408843 DOI: 10.1186/s13100-019-0151-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 02/27/2019] [Indexed: 12/11/2022] Open
Abstract
Human stem cells harbor significant potential for basic and clinical translational research as well as regenerative medicine. Currently ~ 3000 adult and ~ 30 pluripotent stem cell-based, interventional clinical trials are ongoing worldwide, and numbers are increasing continuously. Although stem cells are promising cell sources to treat a wide range of human diseases, there are also concerns regarding potential risks associated with their clinical use, including genomic instability and tumorigenesis concerns. Thus, a deeper understanding of the factors and molecular mechanisms contributing to stem cell genome stability are a prerequisite to harnessing their therapeutic potential for degenerative diseases. Chemical and physical factors are known to influence the stability of stem cell genomes, together with random mutations and Copy Number Variants (CNVs) that accumulated in cultured human stem cells. Here we review the activity of endogenous transposable elements (TEs) in human multipotent and pluripotent stem cells, and the consequences of their mobility for genomic integrity and host gene expression. We describe transcriptional and post-transcriptional mechanisms antagonizing the spread of TEs in the human genome, and highlight those that are more prevalent in multipotent and pluripotent stem cells. Notably, TEs do not only represent a source of mutations/CNVs in genomes, but are also often harnessed as tools to engineer the stem cell genome; thus, we also describe and discuss the most widely applied transposon-based tools and highlight the most relevant areas of their biomedical applications in stem cells. Taken together, this review will contribute to the assessment of the risk that endogenous TE activity and the application of genetically engineered TEs constitute for the biosafety of stem cells to be used for substitutive and regenerative cell therapies.
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Affiliation(s)
- Gerald G Schumann
- 1Division of Medical Biotechnology, Paul-Ehrlich-Institut, Paul-Ehrlich-Str.51-59, 63225 Langen, Germany
| | - Nina V Fuchs
- 2Host-Pathogen Interactions, Paul-Ehrlich-Institut, Paul-Ehrlich-Str. 51-59, 63225 Langen, Germany
| | - Pablo Tristán-Ramos
- 3GENYO. Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, PTS Granada-Avenida de la Ilustración, 114, 18016 Granada, Spain.,4Department of Biochemistry and Molecular Biology II, Faculty of Pharmacy, University of Granada, Campus Universitario de Cartuja, 18071 Granada, Spain
| | - Attila Sebe
- 1Division of Medical Biotechnology, Paul-Ehrlich-Institut, Paul-Ehrlich-Str.51-59, 63225 Langen, Germany
| | - Zoltán Ivics
- 1Division of Medical Biotechnology, Paul-Ehrlich-Institut, Paul-Ehrlich-Str.51-59, 63225 Langen, Germany
| | - Sara R Heras
- 3GENYO. Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, PTS Granada-Avenida de la Ilustración, 114, 18016 Granada, Spain.,4Department of Biochemistry and Molecular Biology II, Faculty of Pharmacy, University of Granada, Campus Universitario de Cartuja, 18071 Granada, Spain
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New tools for old drugs: Functional genetic screens to optimize current chemotherapy. Drug Resist Updat 2018; 36:30-46. [PMID: 29499836 PMCID: PMC5844649 DOI: 10.1016/j.drup.2018.01.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 12/29/2017] [Accepted: 01/06/2018] [Indexed: 12/26/2022]
Abstract
Despite substantial advances in the treatment of various cancers, many patients still receive anti-cancer therapies that hardly eradicate tumor cells but inflict considerable side effects. To provide the best treatment regimen for an individual patient, a major goal in molecular oncology is to identify predictive markers for a personalized therapeutic strategy. Regarding novel targeted anti-cancer therapies, there are usually good markers available. Unfortunately, however, targeted therapies alone often result in rather short remissions and little cytotoxic effect on the cancer cells. Therefore, classical chemotherapy with frequent long remissions, cures, and a clear effect on cancer cell eradication remains a corner stone in current anti-cancer therapy. Reliable biomarkers which predict the response of tumors to classical chemotherapy are rare, in contrast to the situation for targeted therapy. For the bulk of cytotoxic therapeutic agents, including DNA-damaging drugs, drugs targeting microtubules or antimetabolites, there are still no reliable biomarkers used in the clinic to predict tumor response. To make progress in this direction, meticulous studies of classical chemotherapeutic drug action and resistance mechanisms are required. For this purpose, novel functional screening technologies have emerged as successful technologies to study chemotherapeutic drug response in a variety of models. They allow a systematic analysis of genetic contributions to a drug-responsive or −sensitive phenotype and facilitate a better understanding of the mode of action of these drugs. These functional genomic approaches are not only useful for the development of novel targeted anti-cancer drugs but may also guide the use of classical chemotherapeutic drugs by deciphering novel mechanisms influencing a tumor’s drug response. Moreover, due to the advances of 3D organoid cultures from patient tumors and in vivo screens in mice, these genetic screens can be applied using conditions that are more representative of the clinical setting. Patient-derived 3D organoid lines furthermore allow the characterization of the “essentialome”, the specific set of genes required for survival of these cells, of an individual tumor, which could be monitored over the course of treatment and help understanding how drug resistance evolves in clinical tumors. Thus, we expect that these functional screens will enable the discovery of novel cancer-specific vulnerabilities, and through clinical validation, move the field of predictive biomarkers forward. This review focuses on novel advanced techniques to decipher the interplay between genetic alterations and drug response.
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Endogenous Transposase Source in Human Cells Mobilizes piggyBac Transposons. Mol Ther 2017; 24:851-4. [PMID: 27198853 DOI: 10.1038/mt.2016.76] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Li H, Guo A, Xie Z, Tu W, Yu J, Wang H, Zhao J, Zhong C, Kang J, Li J, Huang S, Shen L. Stabilization of mouse haploid embryonic stem cells with combined kinase and signal modulation. Sci Rep 2017; 7:13222. [PMID: 29038567 PMCID: PMC5643530 DOI: 10.1038/s41598-017-13471-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 09/22/2017] [Indexed: 12/19/2022] Open
Abstract
Mammalian haploid embryonic stem cells (haESCs) provide new possibilities for large-scale genetic screens because they bear only one copy of each chromosome. However, haESCs are prone to spontaneous diploidization through unknown mechanisms. Here, we report that a small molecule combination could restrain mouse haESCs from diploidization by impeding exit from naïve pluripotency and by shortening the S-G2/M phases. Combined with 2i and PD166285, our chemical cocktail could maintain haESCs in the haploid state for at least five weeks without fluorescence-activated cell sorting (FACS) enrichment of haploid cells. Taken together, we established an effective chemical approach for long-term maintenance of haESCs, and highlighted that proper cell cycle progression was critical for the maintenance of haploid state.
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Affiliation(s)
- Haisen Li
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell biology, Chinese Academy of Sciences, Shanghai, 200031, China.,Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis, and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health, Bethesda, Maryland, 20892, USA
| | - Ao Guo
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell biology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Zhenfei Xie
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell biology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Wanzhi Tu
- School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Jiali Yu
- Life Sciences Institute, Zhejiang University, Hangzhou, 310000, China
| | - Huihan Wang
- Life Sciences Institute, Zhejiang University, Hangzhou, 310000, China
| | - Jian Zhao
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell biology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Cuiqing Zhong
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell biology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Jiuhong Kang
- Clinical and Translational Research Center of Shanghai First Maternity and Infant Hospital, Shanghai Key Laboratory of Signaling and Disease Research, School of Life Science and Technology, Tongji University, Shanghai, 200092, China
| | - Jinsong Li
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell biology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Shichao Huang
- State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell biology, Chinese Academy of Sciences, Shanghai, 200031, China. .,Shanghai Key Laboratory of Signaling and Disease Research, Laboratory of Receptor-based Bio-medicine, School of Life Sciences and Technology, Tongji University, Shanghai, 200092, China.
| | - Li Shen
- Life Sciences Institute, Zhejiang University, Hangzhou, 310000, China.
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8
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Abstract
Haploid cells are excellent tools to study gene function as they contain a single copy of the genome and are thus unable to mask the effect of mutations. Recently, haploid embryonic stem cells, which are capable of self-renewal and potentially differentiating into other cell types despite having only one set of chromosomes, have been established in several species. These unique haploid cells allow us to seek recessive gene functions in mammals, and have had a profound influence on the field of genetic screening and drug target identification. In this review, we briefly introduce advances and breakthroughs in haploid cell line research and broadly discuss the versatile application thereof.
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Affiliation(s)
- Yanni Li
- State Key Laboratory of Medicinal Chemical Biology, Nankai University, College of Pharmacy, Tianjin, 300350, China
| | - Ling Shuai
- State Key Laboratory of Medicinal Chemical Biology, Nankai University, College of Pharmacy, Tianjin, 300350, China.
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Kawakami K, Largaespada DA, Ivics Z. Transposons As Tools for Functional Genomics in Vertebrate Models. Trends Genet 2017; 33:784-801. [PMID: 28888423 DOI: 10.1016/j.tig.2017.07.006] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/14/2017] [Accepted: 07/18/2017] [Indexed: 02/06/2023]
Abstract
Genetic tools and mutagenesis strategies based on transposable elements are currently under development with a vision to link primary DNA sequence information to gene functions in vertebrate models. By virtue of their inherent capacity to insert into DNA, transposons can be developed into powerful tools for chromosomal manipulations. Transposon-based forward mutagenesis screens have numerous advantages including high throughput, easy identification of mutated alleles, and providing insight into genetic networks and pathways based on phenotypes. For example, the Sleeping Beauty transposon has become highly instrumental to induce tumors in experimental animals in a tissue-specific manner with the aim of uncovering the genetic basis of diverse cancers. Here, we describe a battery of mutagenic cassettes that can be applied in conjunction with transposon vectors to mutagenize genes, and highlight versatile experimental strategies for the generation of engineered chromosomes for loss-of-function as well as gain-of-function mutagenesis for functional gene annotation in vertebrate models, including zebrafish, mice, and rats.
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Affiliation(s)
- Koichi Kawakami
- Division of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Japan; These authors contributed equally to this work
| | - David A Largaespada
- Department of Genetics, Cell Biology and Development, University of Minnesota, MN, USA; These authors contributed equally to this work
| | - Zoltán Ivics
- Division of Medical Biotechnology, Paul Ehrlich Institute, Langen, Germany; These authors contributed equally to this work..
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Muñoz-Lopez M, Vilar-Astasio R, Tristan-Ramos P, Lopez-Ruiz C, Garcia-Pérez JL. Study of Transposable Elements and Their Genomic Impact. Methods Mol Biol 2016; 1400:1-19. [PMID: 26895043 DOI: 10.1007/978-1-4939-3372-3_1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Transposable elements (TEs) have been considered traditionally as junk DNA, i.e., DNA sequences that despite representing a high proportion of genomes had no evident cellular functions. However, over the last decades, it has become undeniable that not only TE-derived DNA sequences have (and had) a fundamental role during genome evolution, but also TEs have important implications in the origin and evolution of many genomic disorders. This concise review provides a brief overview of the different types of TEs that can be found in genomes, as well as a list of techniques and methods used to study their impact and mobilization. Some of these techniques will be covered in detail in this Method Book.
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Affiliation(s)
- Martin Muñoz-Lopez
- Department of Human DNA Variability, Pfizer/University of Granada and Andalusian Regional Government Center for Genomics and Oncology (GENYO), Avda Ilustracion 114, PTS Granada, 18016, Granada, Spain.
| | - Raquel Vilar-Astasio
- Department of Human DNA Variability, Pfizer/University of Granada and Andalusian Regional Government Center for Genomics and Oncology (GENYO), Avda Ilustracion 114, PTS Granada, 18016, Granada, Spain
| | - Pablo Tristan-Ramos
- Department of Human DNA Variability, Pfizer/University of Granada and Andalusian Regional Government Center for Genomics and Oncology (GENYO), Avda Ilustracion 114, PTS Granada, 18016, Granada, Spain
| | - Cesar Lopez-Ruiz
- Department of Human DNA Variability, Pfizer/University of Granada and Andalusian Regional Government Center for Genomics and Oncology (GENYO), Avda Ilustracion 114, PTS Granada, 18016, Granada, Spain
| | - Jose L Garcia-Pérez
- -Genyo (Center for Genomics and Oncological Research), Pfizer/Universidad de Granada/Junta de Andalucia. PTS Granada, Spain-Institute of Genetics and Molecular Medicine (IGMM), University of Edinburgh,, Edinburgh, UK
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Abstract
Viruses have evolved intricate mechanisms to gain entry into the host cell. Identification of host proteins that serve as viral receptors has enabled insights into virus particle internalization, host and tissue tropism, and viral pathogenesis. In this review we discuss the most commonly employed methods for virus receptor discovery, specifically highlighting the use of forward genetic screens in human haploid cells. The ability to generate true knockout alleles at high saturation provides a sensitive means to study virus-host interactions. To illustrate the power of such haploid genetic screens, we highlight the discovery of the lysosomal proteins NPC1 and LAMP1 as intracellular receptors for Ebola virus and Lassa virus, respectively. From these studies emerges the notion that receptor usage by these viruses is highly dynamic, involving a programmed switch from cell surface receptor to intracellular receptor. Broad application of genetic knockout approaches will chart functional landscapes of receptors and endocytic pathways hijacked by viruses.
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Affiliation(s)
- Sirika Pillay
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California 94305; ,
| | - Jan E Carette
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California 94305; ,
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