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Yang Y, Huang G, Dong Y. Stability and Hopf bifurcation of an HIV infection model with two time delays. MATHEMATICAL BIOSCIENCES AND ENGINEERING : MBE 2023; 20:1938-1959. [PMID: 36899516 DOI: 10.3934/mbe.2023089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
This work focuses on an HIV infection model with intracellular delay and immune response delay, in which the former delay refers to the time it takes for healthy cells to become infectious after infection, and the latter delay refers to the time when immune cells are activated and induced by infected cells. By investigating the properties of the associated characteristic equation, we derive sufficient criteria for the asymptotic stability of the equilibria and the existence of Hopf bifurcation to the delayed model. Based on normal form theory and center manifold theorem, the stability and the direction of the Hopf bifurcating periodic solutions are studied. The results reveal that the intracellular delay cannot affect the stability of the immunity-present equilibrium, but the immune response delay can destabilize the stable immunity-present equilibrium through the Hopf bifurcation. Numerical simulations are provided to support the theoretical results.
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Affiliation(s)
- Yu Yang
- School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China
| | - Gang Huang
- School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China
| | - Yueping Dong
- School of Mathematics and Statistics, Central China Normal University, Wuhan 430079, China
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2
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Hawsawi YM, Shams A, Theyab A, Siddiqui J, Barnawee M, Abdali WA, Marghalani NA, Alshelali NH, Al-Sayed R, Alzahrani O, Alqahtani A, Alsulaiman AM. The State-of-the-Art of Gene Editing and its Application to Viral Infections and Diseases Including COVID-19. Front Cell Infect Microbiol 2022; 12:869889. [PMID: 35782122 PMCID: PMC9241565 DOI: 10.3389/fcimb.2022.869889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 05/09/2022] [Indexed: 11/26/2022] Open
Abstract
Gene therapy delivers a promising hope to cure many diseases and defects. The discovery of gene-editing technology fueled the world with valuable tools that have been employed in various domains of science, medicine, and biotechnology. Multiple means of gene editing have been established, including CRISPR/Cas, ZFNs, and TALENs. These strategies are believed to help understand the biological mechanisms of disease progression. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been designated the causative virus for coronavirus disease 2019 (COVID-19) that emerged at the end of 2019. This viral infection is a highly pathogenic and transmissible disease that caused a public health pandemic. As gene editing tools have shown great success in multiple scientific and medical areas, they could eventually contribute to discovering novel therapeutic and diagnostic strategies to battle the COVID-19 pandemic disease. This review aims to briefly highlight the history and some of the recent advancements of gene editing technologies. After that, we will describe various biological features of the CRISPR-Cas9 system and its diverse implications in treating different infectious diseases, both viral and non-viral. Finally, we will present current and future advancements in combating COVID-19 with a potential contribution of the CRISPR system as an antiviral modality in this battle.
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Affiliation(s)
- Yousef M. Hawsawi
- Research Center, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia
- College of Medicine, Al-Faisal University, Riyadh, Saudi Arabia
- *Correspondence: Yousef M. Hawsawi, ; Anwar Shams, ;
| | - Anwar Shams
- Department of Pharmacology, College of Medicine, Taif University, Mecca, Saudi Arabia
- *Correspondence: Yousef M. Hawsawi, ; Anwar Shams, ;
| | - Abdulrahman Theyab
- College of Medicine, Al-Faisal University, Riyadh, Saudi Arabia
- Department of Laboratory & Blood Bank, Security Forces Hospital, Mecca, Saudi Arabia
| | - Jumana Siddiqui
- Research Center, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia
| | - Mawada Barnawee
- Research Center, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia
| | - Wed A. Abdali
- Research Center, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia
| | - Nada A. Marghalani
- Research Center, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia
| | - Nada H. Alshelali
- Research Center, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia
| | - Rawan Al-Sayed
- Research Center, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia
| | - Othman Alzahrani
- Department of Biology, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
- Genome and Biotechnology Unit, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
| | - Alanoud Alqahtani
- Bristol Medical School, Faculty of Health Sciences, University of Bristol, Bristol, United Kingdom
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Abstract
The interplay between immune response and HIV is intensely studied via mathematical modeling, with significant insights but few direct answers. In this short review, we highlight advances and knowledge gaps across different aspects of immunity. In particular, we identify the innate immune response and its role in priming the adaptive response as ripe for modeling. The latter have been the focus of most modeling studies, but we also synthesize key outstanding questions regarding effector mechanisms of cellular immunity and development of broadly neutralizing antibodies. Thus far, most modeling studies aimed to infer general immune mechanisms; we foresee that significant progress will be made next by detailed quantitative fitting of models to data, and prediction of immune responses.
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Affiliation(s)
- Jessica M Conway
- Department of Mathematics and Center for Infectious Disease Dynamics, Pennsylvania State University, University Park PA 16802, USA
| | - Ruy M Ribeiro
- Laboratorio de Biomatematica, Faculdade de Medicina da Universidade de Lisboa, Portugal and Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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HIV Dynamics With Immune Responses: Perspectives From Mathematical Modeling. CURRENT CLINICAL MICROBIOLOGY REPORTS 2016. [DOI: 10.1007/s40588-016-0049-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Bielejec F, Baele G, Rodrigo AG, Suchard MA, Lemey P. Identifying predictors of time-inhomogeneous viral evolutionary processes. Virus Evol 2016; 2:vew023. [PMID: 27774306 PMCID: PMC5072463 DOI: 10.1093/ve/vew023] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Various factors determine the rate at which mutations are generated and fixed in viral genomes. Viral evolutionary rates may vary over the course of a single persistent infection and can reflect changes in replication rates and selective dynamics. Dedicated statistical inference approaches are required to understand how the complex interplay of these processes shapes the genetic diversity and divergence in viral populations. Although evolutionary models accommodating a high degree of complexity can now be formalized, adequately informing these models by potentially sparse data, and assessing the association of the resulting estimates with external predictors, remains a major challenge. In this article, we present a novel Bayesian evolutionary inference method, which integrates multiple potential predictors and tests their association with variation in the absolute rates of synonymous and non-synonymous substitutions along the evolutionary history. We consider clinical and virological measures as predictors, but also changes in population size trajectories that are simultaneously inferred using coalescent modelling. We demonstrate the potential of our method in an application to within-host HIV-1 sequence data sampled throughout the infection of multiple patients. While analyses of individual patient populations lack statistical power, we detect significant evidence for an abrupt drop in non-synonymous rates in late stage infection and a more gradual increase in synonymous rates over the course of infection in a joint analysis across all patients. The former is predicted by the immune relaxation hypothesis while the latter may be in line with increasing replicative fitness during the asymptomatic stage.
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Affiliation(s)
- Filip Bielejec
- Department of Microbiology and Immunology, Rega Institute, KU Leuven, Leuven, Belgium
| | - Guy Baele
- Department of Microbiology and Immunology, Rega Institute, KU Leuven, Leuven, Belgium
| | - Allen G Rodrigo
- Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Marc A Suchard
- Department of Biomathematics and Human Genetics, David Geffen School of Medicine at UCLA, University of California, Los Angeles, CA 90095, USA; Department of Biostatistics, UCLA Fielding School of Public Health, University of California, Los Angeles, CA 90095, USA
| | - Philippe Lemey
- Department of Microbiology and Immunology, Rega Institute, KU Leuven, Leuven, Belgium
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Bęczkowski PM, Logan N, McMonagle E, Litster A, Willett BJ, Hosie MJ. An investigation of the breadth of neutralizing antibody response in cats naturally infected with feline immunodeficiency virus. J Gen Virol 2014; 96:671-680. [PMID: 25395594 PMCID: PMC4336861 DOI: 10.1099/vir.0.071522-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Neutralizing antibodies (NAbs) are believed to comprise an essential component of the protective immune response induced by vaccines against feline immunodeficiency virus (FIV) and human immunodeficiency virus (HIV) infections. However, relatively little is known about the role of NAbs in controlling FIV infection and subsequent disease progression. Here, we present studies where we examined the neutralization of HIV-luciferase pseudotypes bearing homologous and heterologous FIV envelope proteins (n = 278) by sequential plasma samples collected at 6 month intervals from naturally infected cats (n = 38) over a period of 18 months. We evaluated the breadth of the NAb response against non-recombinant homologous and heterologous clade A and clade B viral variants, as well as recombinants, and assessed the results, testing for evidence of an association between the potency of the NAb response and the duration of infection, CD4+ T lymphocyte numbers, health status and survival times of the infected cats. Neutralization profiles varied significantly between FIV-infected cats and strong autologous neutralization, assessed using luciferase-based in vitro assays, did not correlate with the clinical outcome. No association was observed between strong NAb responses and either improved health status or increased survival time of infected animals, implying that other protective mechanisms were likely to be involved. Similarly, no correlation was observed between the development of autologous NAbs and the duration of infection. Furthermore, cross-neutralizing antibodies were evident in only a small proportion (13 %) of cats.
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Affiliation(s)
- Paweł M Bęczkowski
- Small Animal Hospital, University of Glasgow, Glasgow, UK.,MRC University of Glasgow Centre for Virus Research, University of Glasgow, Glasgow, UK
| | - Nicola Logan
- MRC University of Glasgow Centre for Virus Research, University of Glasgow, Glasgow, UK
| | - Elizabeth McMonagle
- MRC University of Glasgow Centre for Virus Research, University of Glasgow, Glasgow, UK
| | - Annette Litster
- Department of Veterinary Clinical Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Brian J Willett
- MRC University of Glasgow Centre for Virus Research, University of Glasgow, Glasgow, UK
| | - Margaret J Hosie
- MRC University of Glasgow Centre for Virus Research, University of Glasgow, Glasgow, UK
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GRIGORIEVA ELLINAV, KHAILOV EVGENIIN, BONDARENKO NATALIAV, KOROBEINIKOV ANDREI. MODELING AND OPTIMAL CONTROL FOR ANTIRETROVIRAL THERAPY. J BIOL SYST 2014. [DOI: 10.1142/s0218339014400026] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We consider a three-dimensional nonlinear control model based on the Wodarz HIV model. The model phase variables are populations of the uninfected and infected target cells and the concentration of an antiretroviral drug. The drug intake rate is assumed to be a bounded control function. An optimal control problem of minimizing the cumulative infection level (the infected cells population) on a given time interval is stated and solved, and the types of the optimal control for different model parameters are found by analytical methods. We thereby reduce the two-point boundary value problem (TPBVP) for the Pontryagin maximum principle to a problem of the finite-dimensional optimization. Numerical results are presented to illustrate the optimal solution.
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Affiliation(s)
- ELLINA V. GRIGORIEVA
- Department of Mathematics and Computer Sciences, Texas Woman's University, Denton, TX 76204, USA
| | - EVGENII N. KHAILOV
- Department of Computational Mathematics and Cybernetics, Moscow State Lomonosov University, Moscow 119992, Russia
| | - NATALIA V. BONDARENKO
- Department of Computational Mathematics and Cybernetics, Moscow State Lomonosov University, Moscow 119992, Russia
| | - ANDREI KOROBEINIKOV
- Centre de Recerca Matemática, Campus de Bellaterra, Edifici C, 08193 Bellaterra, Barcelona, Spain
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Wang K, Jin Y, Fan A. The effect of immune responses in viral infections: A mathematical model view. ACTA ACUST UNITED AC 2014. [DOI: 10.3934/dcdsb.2014.19.3379] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Fan R, Dong Y, Huang G, Takeuchi Y. Apoptosis in virus infection dynamics models. JOURNAL OF BIOLOGICAL DYNAMICS 2014; 8:20-41. [PMID: 24963975 PMCID: PMC4220821 DOI: 10.1080/17513758.2014.895433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Accepted: 02/04/2014] [Indexed: 06/03/2023]
Abstract
In this paper, on the basis of the simplified two-dimensional virus infection dynamics model, we propose two extended models that aim at incorporating the influence of activation-induced apoptosis which directly affects the population of uninfected cells. The theoretical analysis shows that increasing apoptosis plays a positive role in control of virus infection. However, after being included the third population of cytotoxic T lymphocytes immune response in HIV-infected patients, it shows that depending on intensity of the apoptosis of healthy cells, the apoptosis can either promote or comfort the long-term evolution of HIV infection. Further, the discrete-time delay of apoptosis is incorporated into the pervious model. Stability switching occurs as the time delay in apoptosis increases. Numerical simulations are performed to illustrate the theoretical results and display the different impacts of a delay in apoptosis.
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Affiliation(s)
- Ruili Fan
- School of Mathematics and Physics, China University of Geosciences, Wuhan430074, China
| | - Yueping Dong
- Graduate School of Science and Technology, Shizuoka University, Hamamatsu432-8561, Japan
| | - Gang Huang
- School of Mathematics and Physics, China University of Geosciences, Wuhan430074, China
| | - Yasuhiro Takeuchi
- Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara252-5258, Japan
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Abstract
The Human Immunodeficiency Virus (HIV) is one of the most threatening viral agents. This virus infects approximately 33 million people, many of whom are unaware of their status because, except for flu-like symptoms right at the beginning of the infection during the acute phase, the disease progresses more or less symptom-free for 5 to 10 years. During this asymptomatic phase, the virus slowly destroys the immune system until the onset of AIDS when opportunistic infections like pneumonia or Kaposi’s sarcoma can overcome immune defenses. Mathematical models have played a decisive role in estimating important parameters (e.g., virion clearance rate or life-span of infected cells). However, most models only account for the acute and asymptomatic latency phase and cannot explain the progression to AIDS. Models that account for the whole course of the infection rely on different hypotheses to explain the progression to AIDS. The aim of this study is to review these models, present their technical approaches and discuss the robustness of their biological hypotheses. Among the few models capturing all three phases of an HIV infection, we can distinguish between those that mainly rely on population dynamics and those that involve virus evolution. Overall, the modeling quest to capture the dynamics of an HIV infection has improved our understanding of the progression to AIDS but, more generally, it has also led to the insight that population dynamics and evolutionary processes can be necessary to explain the course of an infection.
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Affiliation(s)
- Samuel Alizon
- Laboratoire MIVEGEC (UMR CNRS 5290, IRD 224, UM1, UM2), 911 avenue Agropolis, B.P. 64501, 34394 Montpellier Cedex 5, France
- Authors to whom correspondence should be addressed; (S.A.); (C.M.); Tel.: +33-4674-16436; Fax: +33-4674-16330
| | - Carsten Magnus
- Department of Zoology, University of Oxford, South Parks Road, OX1 3PS, Oxford, UK
- Authors to whom correspondence should be addressed; (S.A.); (C.M.); Tel.: +33-4674-16436; Fax: +33-4674-16330
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