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Kirk A, Graham SV. The human papillomavirus late life cycle and links to keratinocyte differentiation. J Med Virol 2024; 96:e29461. [PMID: 38345171 DOI: 10.1002/jmv.29461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 12/21/2023] [Accepted: 01/25/2024] [Indexed: 02/15/2024]
Abstract
Regulation of human papillomavirus (HPV) gene expression is tightly linked to differentiation of the keratinocytes the virus infects. HPV late gene expression is confined to the cells in the upper layers of the epithelium where the virus capsid proteins are synthesized. As these proteins are highly immunogenic, and the upper epithelium is an immune-privileged site, this spatial restriction aids immune evasion. Many decades of work have contributed to the current understanding of how this restriction occurs at a molecular level. This review will examine what is known about late gene expression in HPV-infected lesions and will dissect the intricacies of late gene regulation. Future directions for novel antiviral approaches will be highlighted.
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Affiliation(s)
- Anna Kirk
- Centre for Virus Research, University of Glasgow, Glasgow, UK
| | - Sheila V Graham
- Centre for Virus Research, University of Glasgow, Glasgow, UK
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2
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Du X, Li S, Yang K, Cao Y. Downregulation of Sonic hedgehog signaling induces G2-arrest in genital warts. Skin Res Technol 2023; 29:e13265. [PMID: 36704875 PMCID: PMC9838784 DOI: 10.1111/srt.13265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 12/13/2022] [Indexed: 12/31/2022]
Abstract
BACKGROUND Human papillomavirus (HPV) infected keratinocyte dysfunction results in the formation of genital warts, and the specific role of Sonic hedgehog (SHh) signaling in genital warts remains elusive. Thus, this study aimed to identify the correlation between wart formation and SHh signaling. MATERIALS AND METHODS In this study, nine male patients with genital warts were recruited, and the expression of SHh and its downstream signal molecules Patched-1 and GLI family zinc finger 1 (Ptch1 and Gli1) was detected. Moreover, G2-phase cells in the collected genital warts samples were assessed with normal foreskin samples as a comparison. HPV6/11 were detected via in situ hybridization (ISH), and SHh expression of the corresponding paraffin sections was determined via immunohistochemical staining (IHC). In addition, an in vitro down-regulated SHh model was constructed by siRNA transfection of the HaCaT cell line, and the cell cycle was detected at 36 h by flow cytometry with propidium iodide staining. RESULTS SHh, Ptch1, and Gli1 in warts were significantly downregulated in the condyloma acuminatum (CA) group compared to the normal foreskin group. G2-phase cells in the middle section of the spinous layer of CA wart tissues were significantly increased. Moreover, the expression of HPV-DNA was amplified and negatively correlated with SHh activity in CA wart tissues. Lastly, the downregulation of SHh-induced G2 arrest in vitro. CONCLUSIONS The downregulation of the SHh signaling promotes HPV replication and the formation of warts by inducing G2/M arrest in the keratinocytes of CA.
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Affiliation(s)
- Xiangxi Du
- Department of Dermatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Shan Li
- Department of Anaesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Kun Yang
- Department of Dermatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yuchun Cao
- Department of Dermatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Chen Z, Utro F, Platt D, DeSalle R, Parida L, Chan PKS, Burk RD. K-Mer Analyses Reveal Different Evolutionary Histories of Alpha, Beta, and Gamma Papillomaviruses. Int J Mol Sci 2021; 22:9657. [PMID: 34502564 PMCID: PMC8432194 DOI: 10.3390/ijms22179657] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/04/2021] [Accepted: 09/05/2021] [Indexed: 12/31/2022] Open
Abstract
Papillomaviruses (PVs) are a heterogeneous group of DNA viruses that can infect fish, birds, reptiles, and mammals. PVs infecting humans (HPVs) phylogenetically cluster into five genera (Alpha-, Beta-, Gamma-, Mu- and Nu-PV), with differences in tissue tropism and carcinogenicity. The evolutionary features associated with the divergence of Papillomaviridae are not well understood. Using a combination of k-mer distributions, genetic metrics, and phylogenetic algorithms, we sought to evaluate the characteristics and differences of Alpha-, Beta- and Gamma-PVs constituting the majority of HPV genomes. A total of 640 PVs including 442 HPV types, 27 non-human primate PV types, and 171 non-primate animal PV types were evaluated. Our analyses revealed the highest genetic diversity amongst Gamma-PVs compared to the Alpha and Beta PVs, suggesting reduced selective pressures on Gamma-PVs. Using a sequence alignment-free trimer (k = 3) phylogeny algorithm, we reconstructed a phylogeny that grouped most HPV types into a monophyletic clade that was further split into three branches similar to alignment-based classifications. Interestingly, a subset of low-risk Alpha HPVs (the species Alpha-2, 3, 4, and 14) split from other HPVs and were clustered with non-human primate PVs. Surprisingly, the trimer-constructed phylogeny grouped the Gamma-6 species types originally isolated from the cervicovaginal region with the main Alpha-HPV clade. These data indicate that characterization of papillomavirus heterogeneity via orthogonal approaches reveals novel insights into the biological understanding of HPV genomes.
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Affiliation(s)
- Zigui Chen
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China;
- Centre for Emerging Infectious Diseases, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Filippo Utro
- Computational Genomics, IBM T. J. Watson Research, Yorktown Heights, NY 10598, USA; (F.U.); (D.P.); (L.P.)
| | - Daniel Platt
- Computational Genomics, IBM T. J. Watson Research, Yorktown Heights, NY 10598, USA; (F.U.); (D.P.); (L.P.)
| | - Rob DeSalle
- Sackler Institute of Comparative Genomics, American Museum of Natural History, New York, NY 10024, USA;
| | - Laxmi Parida
- Computational Genomics, IBM T. J. Watson Research, Yorktown Heights, NY 10598, USA; (F.U.); (D.P.); (L.P.)
| | - Paul K. S. Chan
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China;
- Centre for Emerging Infectious Diseases, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Robert D. Burk
- Department of Pediatrics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Department of Obstetrics, Gynecology and Woman’s Health, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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Tu Q, Feng W, Chen Z, Li Q, Zhao Y, Chen J, Jiang P, Xue X, Zhang L, Zhao KN. Characterization of Episomal Replication of Bovine Papillomavirus Type 1 DNA in Long-Term Virion-Infected Saccharomyces Cerevisiae Culture. Virol Sin 2021; 36:1492-1502. [PMID: 34460066 PMCID: PMC8692549 DOI: 10.1007/s12250-021-00439-y] [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: 02/22/2021] [Accepted: 05/21/2021] [Indexed: 11/29/2022] Open
Abstract
We have previously reported that bovine papillomavirus type 1 (BPV-1) DNA can replicate its genome and produce infectious virus-like particles in short term virion-infected S. cerevisiae (budding yeast) cultures (Zhao and Frazer 2002, Journal of Virology, 76:3359–64 and 76:12265–73). Here, we report the episomal replications of BPV-1 DNA in long term virion-infected S. cerevisiae culture up to 108 days. Episomal replications of the BPV-1 DNA could be divided into three patterns at three stages, early active replication (day 3–16), middle weak replication (day 23–34/45) and late stable replication (day 45–82). Two-dimensional gel electrophoresis analysis and Southern blot hybridization have revealed further that multiple replication intermediates of BPV-1 DNA including linear form, stranded DNA, monomers and higher oligomers were detected in the virion-infected yeast cells over the time course. Higher oligomers shown as covalently closed circular DNAs (cccDNAs) are the most important replication intermediates that serve as the main nuclear transcription template for producing all viral RNAs in the viral life cycle. In this study, the cccDNAs were generated at the early active replication stage with the highest frequencies and then at late stable replication, but they appeared to be suppressed at the middle weak replication. Our data provided a novel insight that BPV-1 genomic DNA could replicate episomally for the long period and produce the key replication intermediates cccDNAs in S. cerevisiae system.
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Affiliation(s)
- Quanmei Tu
- Department of Obstetrics and Gynaecology, The Second Affiliated Hospital and Yuyin Children Hospital of Wenzhou Medical University, Wenzhou, 325035, China
| | - Weixu Feng
- Institute of Molecular Virology and Immunology, Department of Microbiology and Immunology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Zhuo Chen
- Institute of Molecular Virology and Immunology, Department of Microbiology and Immunology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Qijia Li
- Department of Obstetrics and Gynaecology, The Second Affiliated Hospital and Yuyin Children Hospital of Wenzhou Medical University, Wenzhou, 325035, China.,Institute of Molecular Virology and Immunology, Department of Microbiology and Immunology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Yu Zhao
- Department of Obstetrics and Gynaecology, The Second Affiliated Hospital and Yuyin Children Hospital of Wenzhou Medical University, Wenzhou, 325035, China
| | - Jun Chen
- Institute of Molecular Virology and Immunology, Department of Microbiology and Immunology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Pengfei Jiang
- Institute of Molecular Virology and Immunology, Department of Microbiology and Immunology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Xiangyang Xue
- Institute of Molecular Virology and Immunology, Department of Microbiology and Immunology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, 325035, China
| | - Lifang Zhang
- Institute of Molecular Virology and Immunology, Department of Microbiology and Immunology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, 325035, China.
| | - Kong-Nan Zhao
- Department of Obstetrics and Gynaecology, The Second Affiliated Hospital and Yuyin Children Hospital of Wenzhou Medical University, Wenzhou, 325035, China. .,Institute of Molecular Virology and Immunology, Department of Microbiology and Immunology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, 325035, China. .,Australian Institute for Bioengineering and Nanotechnology, the University of Queensland, St Lucia, 4067, Australia.
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5
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HPV16 E7-impaired keratinocyte differentiation leads to tumorigenesis via cell cycle/pRb/involucrin/spectrin/adducin cascade. Appl Microbiol Biotechnol 2020; 104:4417-4433. [PMID: 32215704 DOI: 10.1007/s00253-020-10492-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 02/14/2020] [Accepted: 02/20/2020] [Indexed: 12/26/2022]
Abstract
Here, we used codon usage technology to generate two codon-modified human papillomavirus (HPV)16 E7 genes and, together with wild-type E7, to construct three HPV16 E7 gene plasmids: Wt-E7, HB1-E7, and HB2-E7. The three HPV 16 E7 plasmids were used to investigate how HPV16 E7 protein was expressed in different cells and how this oncoprotein deregulated cellular and molecular events in human keratinocytes to induce carcinogenesis. We discovered that codon usage of HPV16 E7 gene played a key role in determining expression of E7 oncoprotein in all tested cells. HPV16 E7 inhibited significantly expression of pRb to impair keratinocyte differentiation and disrupted development of skin epidermis in mice. HPV16 E7 increased substantially the number of G0/G1 cells associated with upregulation of cyclin D2 and downregulation of cyclin B1 in keratinocytes. HPV16 E7 not only inhibited expression of involucrin and α-spectrin but also disrupted the organization of involucrin filaments and spectrin cytoskeleton. Furthermore, HPV16 E7 inhibited expression of β-adducin, destroyed its cytoskeletal structure and induced phosphorylation of β-adducin(Ser662) in keratinocytes. Importantly, HPV16 E7 induced carcinogenesis in mice associated with expression of phosphorylated β-adducin(Ser662) and its nucleus-translocation. In conclusion, we provided evidence that HPV16 E7 oncoprotein inhibited keratinocyte differentiation in vitro and in vivo leading to carcinogenesis through cell cycle arrest and disruption of pRb/involucrin/spectrin/adducin cascade.
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Ma XX, Ma P, Chang QY, Liu ZB, Zhang D, Zhou XK, Ma ZR, Cao X. Adaptation ofBorrelia burgdorferito its natural hosts by synonymous codon and amino acid usage. J Basic Microbiol 2018. [DOI: 10.1002/jobm.201700652] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xiao-Xia Ma
- Engineering and Technology Research Center for Animal Cell, Gansu; College of Life Science and Engineering; Northwest Minzu University; Gansu P.R. China
| | - Peng Ma
- Engineering and Technology Research Center for Animal Cell, Gansu; College of Life Science and Engineering; Northwest Minzu University; Gansu P.R. China
| | - Qiu-Yan Chang
- Engineering and Technology Research Center for Animal Cell, Gansu; College of Life Science and Engineering; Northwest Minzu University; Gansu P.R. China
| | - Zhen-Bin Liu
- Engineering and Technology Research Center for Animal Cell, Gansu; College of Life Science and Engineering; Northwest Minzu University; Gansu P.R. China
| | - Derong Zhang
- Engineering and Technology Research Center for Animal Cell, Gansu; College of Life Science and Engineering; Northwest Minzu University; Gansu P.R. China
| | - Xiao-Kai Zhou
- Engineering and Technology Research Center for Animal Cell, Gansu; College of Life Science and Engineering; Northwest Minzu University; Gansu P.R. China
| | - Zhong-Ren Ma
- Engineering and Technology Research Center for Animal Cell, Gansu; College of Life Science and Engineering; Northwest Minzu University; Gansu P.R. China
| | - Xin Cao
- Engineering and Technology Research Center for Animal Cell, Gansu; College of Life Science and Engineering; Northwest Minzu University; Gansu P.R. China
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Graham SV. Keratinocyte Differentiation-Dependent Human Papillomavirus Gene Regulation. Viruses 2017; 9:E245. [PMID: 28867768 PMCID: PMC5618011 DOI: 10.3390/v9090245] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 08/24/2017] [Accepted: 08/25/2017] [Indexed: 12/29/2022] Open
Abstract
Human papillomaviruses (HPVs) cause diseases ranging from benign warts to invasive cancers. HPVs infect epithelial cells and their replication cycle is tightly linked with the differentiation process of the infected keratinocyte. The normal replication cycle involves an early and a late phase. The early phase encompasses viral entry and initial genome replication, stimulation of cell division and inhibition of apoptosis in the infected cell. Late events in the HPV life cycle include viral genome amplification, virion formation, and release into the environment from the surface of the epithelium. The main proteins required at the late stage of infection for viral genome amplification include E1, E2, E4 and E5. The late proteins L1 and L2 are structural proteins that form the viral capsid. Regulation of these late events involves both cellular and viral proteins. The late viral mRNAs are expressed from a specific late promoter but final late mRNA levels in the infected cell are controlled by splicing, polyadenylation, nuclear export and RNA stability. Viral late protein expression is also controlled at the level of translation. This review will discuss current knowledge of how HPV late gene expression is regulated.
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Affiliation(s)
- Sheila V Graham
- MRC-University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Garscube Estate, Glasgow G61 1QH, UK.
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8
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Zhang L, Wu J, Ling MT, Zhao L, Zhao KN. The role of the PI3K/Akt/mTOR signalling pathway in human cancers induced by infection with human papillomaviruses. Mol Cancer 2015; 14:87. [PMID: 26022660 PMCID: PMC4498560 DOI: 10.1186/s12943-015-0361-x] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 04/06/2015] [Indexed: 01/08/2023] Open
Abstract
Infection with Human papillomaviruses (HPVs) leads to the development of a wide-range of cancers, accounting for 5% of all human cancers. A prominent example is cervical cancer, one of the leading causes of cancer death in women worldwide. It has been well established that tumor development and progression induced by HPV infection is driven by the sustained expression of two oncogenes E6 and E7. The expression of E6 and E7 not only inhibits the tumor suppressors p53 and Rb, but also alters additional signalling pathways that may be equally important for transformation. Among these pathways, the phosphatidylinositol 3-kinase (PI3K)/Akt/mammalian target of rapamycin (mTOR) signalling cascade plays a very important role in HPV-induced carcinogenesis by acting through multiple cellular and molecular events. In this review, we summarize the frequent amplification of PI3K/Akt/mTOR signals in HPV-induced cancers and discuss how HPV oncogenes E6/E7/E5 activate the PI3K/Akt/mTOR signalling pathway to modulate tumor initiation and progression and affect patient outcome. Improvement of our understanding of the mechanism by which the PI3K/Akt/mTOR signalling pathway contributes to the immortalization and carcinogenesis of HPV-transduced cells will assist in devising novel strategies for preventing and treating HPV-induced cancers.
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Affiliation(s)
- Lifang Zhang
- Institute of Molecular Virology and Immunology, Wenzhou Medical University, Wenzhou, 325035 , Zhejiang, PR China.
| | - Jianhong Wu
- Australian Prostate Cancer Research Centre-Queensland, Institute of Health and Biomedical Innovation, Queensland University of Technology, 37 Kent Street, Woolloongabba, Brisbane, 4102, QLD, Australia.
- Current address: Department of Gastric Cancer and Soft Tissue Sarcomas Surgery, Fudan University Shanghai Cancer Center, Shanghai, 200032, PR China.
| | - Ming Tat Ling
- Australian Prostate Cancer Research Centre-Queensland, Institute of Health and Biomedical Innovation, Queensland University of Technology, 37 Kent Street, Woolloongabba, Brisbane, 4102, QLD, Australia.
| | - Liang Zhao
- The University of Queensland, Brisbane, 4072, QLD, Australia.
| | - Kong-Nan Zhao
- Institute of Molecular Virology and Immunology, Wenzhou Medical University, Wenzhou, 325035 , Zhejiang, PR China.
- Centre for Kidney Disease Research-Venomics Research, The University of Queensland School of Medicine, Translational Research Institute, 37 Kent Street, Woolloongabba, Brisbane, 4102, QLD, Australia.
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Zhao KN. In vitro translation of papillomavirus authentic and codon-modified L1 capsid gene mRNAs in mouse keratinocyte cell-free lysate. Methods Mol Biol 2014; 1118:205-18. [PMID: 24395418 DOI: 10.1007/978-1-62703-782-2_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
Keratinocytes are the major cell type in the epidermis responsible for constructing the protective barrier of mammalian skin. Primary keratinocytes cultured in vitro can mimic the in vivo differentiation process, providing an abundant source of pure keratinocytes used for investigating the regulatory mechanisms of gene expression associated with cell proliferation and differentiation. We developed a primary mouse keratinocyte cell-free lysate system for translation of papillomavirus authentic and codon-modified L1 capsid gene mRNAs in vitro. We demonstrated that the viral gene codon usage matched available aminoacyl-tRNAs to determine their translational efficiencies, which were associated with differentiation status of the keratinocytes used for preparing cell-free lysate. We revealed that a novel regulatory mechanism of gene expression is utilized by papillomavirus to direct viral capsid protein expression to the site of virion assembly in mature keratinocytes. Here, I describe the methods in details of how to establish primary mouse keratinocyte culture, to prepare cell-free lysate, to carry out in vitro translation of the viral gene mRNAs, and to detect the translated products using Western blotting analysis.
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Affiliation(s)
- Kong-Nan Zhao
- UQ Centre for Clinical Research, The University of Queensland, Herston, Brisbane, QLD, Australia
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10
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Zhou JH, Zhang J, Sun DJ, Ma Q, Ma B, Pejsak Z, Chen HT, Ma LN, Ding YZ, Liu YS. Potential roles of synonymous codon usage and tRNA concentration in hosts on the two initiation regions of foot-and-mouth disease virus RNA. Virus Res 2013; 176:298-302. [DOI: 10.1016/j.virusres.2013.06.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 06/10/2013] [Accepted: 06/14/2013] [Indexed: 12/01/2022]
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Zhao KN, Masci PP, Chen J, Lavin MF. Calcium prevents retinoic acid-induced disruption of the spectrin-based cytoskeleton in keratinocytes through the Src/PI3K-p85α/AKT/PKCδ/β-adducin pathways. Cell Calcium 2013; 54:151-62. [DOI: 10.1016/j.ceca.2013.05.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 05/06/2013] [Accepted: 05/24/2013] [Indexed: 10/26/2022]
Affiliation(s)
- Kong-Nan Zhao
- Centre for Kidney Disease--Venomics Research, School of Medicine, The University of Queensland, Princess Alexandra Hospital, Woolloongabba, Brisbane, QLD 4102, Australia.
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Synonymous codon changes in the oncogenes of the cottontail rabbit papillomavirus lead to increased oncogenicity and immunogenicity of the virus. Virology 2013; 438:70-83. [PMID: 23433866 DOI: 10.1016/j.virol.2013.01.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 12/21/2012] [Accepted: 01/09/2013] [Indexed: 12/30/2022]
Abstract
Papillomaviruses use rare codons with respect to the host. The reasons for this are incompletely understood but among the hypotheses is the concept that rare codons result in low protein production and this allows the virus to escape immune surveillance. We changed rare codons in the oncogenes E6 and E7 of the cottontail rabbit papillomavirus to make them more mammalian-like and tested the mutant genomes in our in vivo animal model. While the amino acid sequences of the proteins remained unchanged, the oncogenic potential of some of the altered genomes increased dramatically. In addition, increased immunogenicity, as measured by spontaneous regression, was observed as the numbers of codon changes increased. This work suggests that codon usage may modify protein production in ways that influence disease outcome and that evaluation of synonymous codons should be included in the analysis of genetic variants of infectious agents and their association with disease.
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Genome dynamics in three different geographical isolates of white spot syndrome virus (WSSV). Arch Virol 2012; 157:2357-62. [PMID: 22836599 DOI: 10.1007/s00705-012-1395-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Accepted: 05/21/2012] [Indexed: 10/28/2022]
Abstract
White spot syndrome virus (WSSV), the sole member of the monotypic family Nimaviridae, is considered an extremely lethal shrimp pathogen. Despite its impact, some essential biological characteristics related to WSSV genome dynamics, such as the synonymous codon usage pattern and selection pressure in genes, remain to be elucidated. The results show that compositional limitations and mutational pressure determine the codon usage bias and base composition in WSSV. Furthermore, different forces of selective pressure are acting across various regions of the WSSV genome. Finally, this study points out the possible occurrence of two major recombination events.
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14
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Zhao KN, Chen J. Codon usage roles in human papillomavirus. Rev Med Virol 2011; 21:397-411. [PMID: 22025363 DOI: 10.1002/rmv.707] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 07/07/2011] [Accepted: 07/11/2011] [Indexed: 12/14/2022]
Abstract
Human papillomavirus (HPV) genomes, similar to other virus genomes, frequently have a G + C content significantly different from their host species. The HPV genomes show a strong codon usage bias to 18 codons, with 14 showing T at the third position amongst degenerately encoded amino acids. The codon usage pattern in HPV genome plays an important role, which regulates low or non-translational expression of the viral capsid genes and results in very weak protein expression of oncogenes in a wide range of mammalian cells. Codon modification has been proved to be a powerful technology to overcome the translational blockage and weak expression of both HPV capsid genes and oncogenes in different expression systems. Furthermore, keratinocytes are the host cells of HPV infection; the codon usage in HPV capsid genes matches available aminoacyl-tRNAs in differentiated keratinocytes to modulate their protein expression. HPV DNA vaccines with codon optimization have been shown to have higher immunogenicity and induce both strong cellular and humoral responses in animal models, which may be a promising form of therapeutic HPV vaccines.
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Affiliation(s)
- Kong-Nan Zhao
- UQ Centre for Clinical Research, The University of Queensland, Brisbane, Queensland, Australia.
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15
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Knight GL, Pugh AG, Yates E, Bell I, Wilson R, Moody CA, Laimins LA, Roberts S. A cyclin-binding motif in human papillomavirus type 18 (HPV18) E1^E4 is necessary for association with CDK-cyclin complexes and G2/M cell cycle arrest of keratinocytes, but is not required for differentiation-dependent viral genome amplification or L1 capsid protein expression. Virology 2011; 412:196-210. [PMID: 21276999 PMCID: PMC3722429 DOI: 10.1016/j.virol.2011.01.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Revised: 12/17/2010] [Accepted: 01/06/2011] [Indexed: 10/18/2022]
Abstract
The G2/M arrest function of human papillomavirus (HPV) E4 proteins is hypothesized to be necessary for viral genome amplification. Full-length HPV18 E1^E4 protein is essential for efficient viral genome amplification. Here we identify key determinants within a CDK-bipartite consensus recognition motif in HPV18 E1^E4 that are critical for association with active CDK-cyclin complexes and in vitro phosphorylation at the predicted CDK phosphorylation site (threonine 23). The optimal cyclin-binding sequence ((43)RRLL(46)) within this E4 motif is required for G2/M arrest of primary keratinocytes and correlates with cytoplasmic retention of cyclin B1, but not cyclin A. Disruption of this motif in the E4 ORF of HPV18 genomes, and the subsequent generation of stable cell lines in primary keratinocytes revealed that this motif was not essential for viral genome amplification or L1 capsid protein induction. We conclude that the HPV18 E4 G2/M arrest function does not play a role in early vegetative events.
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Affiliation(s)
- Gillian L. Knight
- Cancer Research UK Cancer Centre, School of Cancer Sciences, University of Birmingham, Birmingham, B15 2TT UK
| | - Alice G. Pugh
- Cancer Research UK Cancer Centre, School of Cancer Sciences, University of Birmingham, Birmingham, B15 2TT UK
| | - Emma Yates
- Cancer Research UK Cancer Centre, School of Cancer Sciences, University of Birmingham, Birmingham, B15 2TT UK
| | - Ian Bell
- Cancer Research UK Cancer Centre, School of Cancer Sciences, University of Birmingham, Birmingham, B15 2TT UK
| | - Regina Wilson
- Department of Microbiology-Immunology, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611 USA
| | - Cary A. Moody
- Department of Microbiology-Immunology, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611 USA
| | - Laimonis A. Laimins
- Department of Microbiology-Immunology, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611 USA
| | - Sally Roberts
- Cancer Research UK Cancer Centre, School of Cancer Sciences, University of Birmingham, Birmingham, B15 2TT UK
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