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Mkhize NN, Yssel AEJ, Kaldine H, van Dorsten RT, Woodward Davis AS, Beaume N, Matten D, Lambson B, Modise T, Kgagudi P, York T, Westfall DH, Giorgi EE, Korber B, Anthony C, Mapengo RE, Bekker V, Domin E, Eaton A, Deng W, DeCamp A, Huang Y, Gilbert PB, Gwashu-Nyangiwe A, Thebus R, Ndabambi N, Mielke D, Mgodi N, Karuna S, Edupuganti S, Seaman MS, Corey L, Cohen MS, Hural J, McElrath MJ, Mullins JI, Montefiori D, Moore PL, Williamson C, Morris L. Neutralization profiles of HIV-1 viruses from the VRC01 Antibody Mediated Prevention (AMP) trials. PLoS Pathog 2023; 19:e1011469. [PMID: 37384759 PMCID: PMC10337935 DOI: 10.1371/journal.ppat.1011469] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 07/12/2023] [Accepted: 06/07/2023] [Indexed: 07/01/2023] Open
Abstract
The VRC01 Antibody Mediated Prevention (AMP) efficacy trials conducted between 2016 and 2020 showed for the first time that passively administered broadly neutralizing antibodies (bnAbs) could prevent HIV-1 acquisition against bnAb-sensitive viruses. HIV-1 viruses isolated from AMP participants who acquired infection during the study in the sub-Saharan African (HVTN 703/HPTN 081) and the Americas/European (HVTN 704/HPTN 085) trials represent a panel of currently circulating strains of HIV-1 and offer a unique opportunity to investigate the sensitivity of the virus to broadly neutralizing antibodies (bnAbs) being considered for clinical development. Pseudoviruses were constructed using envelope sequences from 218 individuals. The majority of viruses identified were clade B and C; with clades A, D, F and G and recombinants AC and BF detected at lower frequencies. We tested eight bnAbs in clinical development (VRC01, VRC07-523LS, 3BNC117, CAP256.25, PGDM1400, PGT121, 10-1074 and 10E8v4) for neutralization against all AMP placebo viruses (n = 76). Compared to older clade C viruses (1998-2010), the HVTN703/HPTN081 clade C viruses showed increased resistance to VRC07-523LS and CAP256.25. At a concentration of 1μg/ml (IC80), predictive modeling identified the triple combination of V3/V2-glycan/CD4bs-targeting bnAbs (10-1074/PGDM1400/VRC07-523LS) as the best against clade C viruses and a combination of MPER/V3/CD4bs-targeting bnAbs (10E8v4/10-1074/VRC07-523LS) as the best against clade B viruses, due to low coverage of V2-glycan directed bnAbs against clade B viruses. Overall, the AMP placebo viruses represent a valuable resource for defining the sensitivity of contemporaneous circulating viral strains to bnAbs and highlight the need to update reference panels regularly. Our data also suggests that combining bnAbs in passive immunization trials would improve coverage of global viruses.
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Affiliation(s)
- Nonhlanhla N. Mkhize
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
- SA MRC Antibody Immunity Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Anna E. J. Yssel
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Haajira Kaldine
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
- SA MRC Antibody Immunity Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Rebecca T. van Dorsten
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
- SA MRC Antibody Immunity Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
- South African Medical Research Council Antiviral Gene Therapy Research Unit, School of Pathology, Faculty of Health Sciences University of the Witwatersrand, Johannesburg, South Africa
| | - Amanda S. Woodward Davis
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Nicolas Beaume
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - David Matten
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Bronwen Lambson
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
- SA MRC Antibody Immunity Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Tandile Modise
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
- SA MRC Antibody Immunity Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Prudence Kgagudi
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
- SA MRC Antibody Immunity Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Talita York
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Dylan H. Westfall
- Department of Microbiology, University of Washington, Seattle, Washington, United States of America
| | - Elena E. Giorgi
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Bette Korber
- Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America
| | - Colin Anthony
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Rutendo E. Mapengo
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
- SA MRC Antibody Immunity Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Valerie Bekker
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
| | - Elizabeth Domin
- Department of Surgery, Duke University, Durham, North Carolina, United States of America
| | - Amanda Eaton
- Department of Surgery, Duke University, Durham, North Carolina, United States of America
| | - Wenjie Deng
- Department of Microbiology, University of Washington, Seattle, Washington, United States of America
| | - Allan DeCamp
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Yunda Huang
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Peter B. Gilbert
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Asanda Gwashu-Nyangiwe
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Ruwayhida Thebus
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Nonkululeko Ndabambi
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Dieter Mielke
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
- Department of Surgery, Duke University, Durham, North Carolina, United States of America
| | - Nyaradzo Mgodi
- University of Zimbabwe College of Health Sciences Clinical Trials Research Centre, Harare, Zimbabwe
| | - Shelly Karuna
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Srilatha Edupuganti
- Division of Infectious Diseases, Department of Medicine, Emory University, Decatur, Georgia, United States of America
| | - Michael S. Seaman
- Center for Virology and Vaccine Research, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Lawrence Corey
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, United States of America
| | - Myron S. Cohen
- Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North-Carolina, United States of America
| | - John Hural
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - M. Juliana McElrath
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - James I. Mullins
- Department of Microbiology, University of Washington, Seattle, Washington, United States of America
| | - David Montefiori
- Department of Surgery, Duke University, Durham, North Carolina, United States of America
| | - Penny L. Moore
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
- SA MRC Antibody Immunity Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu Natal, Durban, South Africa
| | - Carolyn Williamson
- Institute for Infectious Diseases and Molecular Medicine, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu Natal, Durban, South Africa
- National Health Laboratory Service, Cape Town, South Africa
| | - Lynn Morris
- National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
- SA MRC Antibody Immunity Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu Natal, Durban, South Africa
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2
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Kitchin D, Richardson SI, van der Mescht MA, Motlou T, Mzindle N, Moyo-Gwete T, Makhado Z, Ayres F, Manamela NP, Spencer H, Lambson B, Oosthuysen B, Kaldine H, du Pisanie M, Mennen M, Skelem S, Williams N, Ntusi NA, Burgers WA, Gray GG, Bekker LG, Boswell MT, Rossouw TM, Ueckermann V, Moore PL. Ad26.COV2.S breakthrough infections induce high titers of neutralizing antibodies against Omicron and other SARS-CoV-2 variants of concern. Cell Rep Med 2022; 3:100535. [PMID: 35474744 PMCID: PMC8828412 DOI: 10.1016/j.xcrm.2022.100535] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 01/19/2022] [Accepted: 01/27/2022] [Indexed: 01/20/2023]
Abstract
The Janssen (Johnson & Johnson) Ad26.COV2.S non-replicating viral vector vaccine has been widely deployed for COVID-19 vaccination programs in resource-limited settings. Here we confirm that neutralizing and binding antibody responses to Ad26.COV2.S vaccination are stable for 6 months post-vaccination, when tested against multiple SARS-CoV-2 variants. Secondly, using longitudinal samples from individuals who experienced clinically mild breakthrough infections 4 to 5 months after vaccination, we show dramatically boosted binding antibodies, Fc effector function, and neutralization. These high titer responses are of similar magnitude to humoral immune responses measured in convalescent donors who had been hospitalized with severe illness, and are cross-reactive against diverse SARS-CoV-2 variants, including the neutralization-resistant Omicron (B.1.1.529) variant that currently dominates global infections, as well as SARS-CoV-1. These data have implications for population immunity in areas where the Ad26.COV2.S vaccine has been widely deployed, but where ongoing infections continue to occur at high levels.
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Affiliation(s)
- Dale Kitchin
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Simone I. Richardson
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Mieke A. van der Mescht
- Department of Immunology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - Thopisang Motlou
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Nonkululeko Mzindle
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Thandeka Moyo-Gwete
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Zanele Makhado
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Frances Ayres
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Nelia P. Manamela
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Holly Spencer
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Bronwen Lambson
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Brent Oosthuysen
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Haajira Kaldine
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Marizane du Pisanie
- Division for Infectious Diseases, Department of Internal Medicine, Steve Biko Academic Hospital and University of Pretoria, Pretoria, South Africa
| | - Mathilda Mennen
- Cape Heart Institute, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Sango Skelem
- Cape Heart Institute, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Noleen Williams
- Cape Heart Institute, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Ntobeko A.B. Ntusi
- Cape Heart Institute, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa,Department of Medicine, University of Cape Town and Groote Schuur Hospital, Cape Town, South Africa,Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Wendy A. Burgers
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa,Division of Medical Virology, Department of Pathology, University of Cape Town, Cape Town, South Africa,Wellcome Centre for Infectious Diseases Research in Africa, University of Cape Town, Cape Town, South Africa
| | - Glenda G. Gray
- The South African Medical Research Council, Tygerberg, South Africa
| | - Linda-Gail Bekker
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa,The Desmond Tutu HIV Centre, University of Cape Town, Cape Town, South Africa
| | - Michael T. Boswell
- Division for Infectious Diseases, Department of Internal Medicine, Steve Biko Academic Hospital and University of Pretoria, Pretoria, South Africa
| | - Theresa M. Rossouw
- Department of Immunology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
| | - Veronica Ueckermann
- Division for Infectious Diseases, Department of Internal Medicine, Steve Biko Academic Hospital and University of Pretoria, Pretoria, South Africa
| | - Penny L. Moore
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa,SAMRC Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa,Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa,Centre for the AIDS Programme of Research in South Africa, Durban, South Africa,Corresponding author
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3
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Kitchin D, Bhiman J, Mvududu D, Oosthuysen B, Lambson B, Madzorera S, Anthony C, Abdool Karim SS, Garrett NJ, Doria-Rose NA, Mascola JR, Morris L, Moore PL. A1 The role of virus-antibody co-evolution in the development of a V3-glycan-directed HIV-1 broadly neutralizing antibody lineage. Virus Evol 2019. [PMCID: PMC6736059 DOI: 10.1093/ve/vez002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Broadly neutralizing antibodies (bNAbs) are essential for a preventative HIV-1 vaccine but have not been elicited through vaccination. bNAbs develop in 20–30 per cent of HIV-1 infections and often target the V3-glycan epitope of the HIV envelope protein (Env). In these individuals, virus-antibody co-evolution is thought to drive the maturation of antibody lineages to neutralization breadth. We used deep sequencing of env genes and antibody transcripts from fourteen time points spanning the first 3 years of infection to characterize the virus-antibody co-evolution in donor CAP255 who developed V3-glycan-specific bNAbs. Sequencing and cloning of env genes, followed by neutralization assays, were used to identify Env mutations associated with neutralization escape from two bNAbs (CAP255.G3 and CAP255.C5) isolated at 149 weeks post-infection (wpi). Sequencing data indicated that CAP255 was co-infected by three related viral variants, all of which had an intact N332 glycan, which persisted in > 90 per cent of later viruses. A recombinant V3-region became fixed from 8 wpi, conferring slight neutralization resistance to CAP255.G3/C5 and other V3-glycan bNAbs. Later, T415R/K substitutions in V4 emerged by 51 wpi and were associated with complete viral escape from CAP255.G3/C5, though not from the polyclonal plasma response. All 93-week and later Envs were resistant to CAP255.G3/C5 and V3-glycan bNAb PGT135. Viral escape by 51 wpi suggested that the CAP255 bNAbs arose earlier, driving escape, but persisted to 149 weeks. This was supported by preliminary deep sequencing of the antibody repertoire that indicated bNAb lineage members were already present in the plasma at 39 wpi. Escape from V3-glycan bNAbs via T415R/K mutations have not previously been shown, suggesting a novel mode of recognition within the V3-glycan supersite. Further work will focus on identifying the bNAb-initiating Env and intermediate bNAb lineage members that were capable of engaging contemporaneous Env neutralization escape mutants. Characterization of Envs that engaged bNAb precursors, as well as those that selected for broader members of the bNAb lineage, will inform the design of immunogens capable of eliciting V3-glycan bNAbs in a novel HIV-1 vaccine regimen.
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Affiliation(s)
- D Kitchin
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), South Africa
- University of the Witwatersrand, Johannesburg, South Africa
| | - J Bhiman
- The Scripps Research Institute, La Jolla, CA, USA
| | - D Mvududu
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), South Africa
| | - B Oosthuysen
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), South Africa
| | - B Lambson
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), South Africa
| | - S Madzorera
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), South Africa
- University of the Witwatersrand, Johannesburg, South Africa
| | - C Anthony
- Institute of Infectious Disease and Molecular Medicine and Division of Medical Virology, University of Cape Town, Cape Town, South Africa
| | - S S Abdool Karim
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu Natal, Durban, South Africa
| | - N J Garrett
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu Natal, Durban, South Africa
| | - N A Doria-Rose
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - J R Mascola
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - L Morris
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), South Africa
- University of the Witwatersrand, Johannesburg, South Africa
| | - P L Moore
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), South Africa
- University of the Witwatersrand, Johannesburg, South Africa
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4
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Umotoy J, Bagaya BS, Joyce C, Schiffner T, Menis S, Saye-Francisco KL, Biddle T, Mohan S, Vollbrecht T, Kalyuzhniy O, Madzorera S, Kitchin D, Lambson B, Nonyane M, Kilembe W, Poignard P, Schief WR, Burton DR, Murrell B, Moore PL, Briney B, Sok D, Landais E. Rapid and Focused Maturation of a VRC01-Class HIV Broadly Neutralizing Antibody Lineage Involves Both Binding and Accommodation of the N276-Glycan. Immunity 2019; 51:141-154.e6. [PMID: 31315032 PMCID: PMC6642152 DOI: 10.1016/j.immuni.2019.06.004] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 03/31/2019] [Accepted: 06/06/2019] [Indexed: 11/25/2022]
Abstract
The VH1-2 restricted VRC01-class of antibodies targeting the HIV envelope CD4 binding site are a major focus of HIV vaccine strategies. However, a detailed analysis of VRC01-class antibody development has been limited by the rare nature of these responses during natural infection and the lack of longitudinal sampling of such responses. To inform vaccine strategies, we mapped the development of a VRC01-class antibody lineage (PCIN63) in the subtype C infected IAVI Protocol C neutralizer PC063. PCIN63 monoclonal antibodies had the hallmark VRC01-class features and demonstrated neutralization breadth similar to the prototype VRC01 antibody, but were 2- to 3-fold less mutated. Maturation occurred rapidly within ∼24 months of emergence of the lineage and somatic hypermutations accumulated at key contact residues. This longitudinal study of broadly neutralizing VRC01-class antibody lineage reveals early binding to the N276-glycan during affinity maturation, which may have implications for vaccine design.
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Affiliation(s)
- Jeffrey Umotoy
- International AIDS Vaccine Initiative Neutralizing Antibody Center, La Jolla, CA 92037, USA; International AIDS Vaccine Initiative, New York, NY 10004, USA
| | - Bernard S Bagaya
- UVRI-IAVI HIV Vaccine Program, Entebbe, Uganda; Department of Immunology and Molecular Biology, School of Biomedical Sciences, College of Health Sciences, Makerere University, Kampala-Uganda
| | - Collin Joyce
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Torben Schiffner
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA; Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery (CHAVI-ID) The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Sergey Menis
- International AIDS Vaccine Initiative Neutralizing Antibody Center, La Jolla, CA 92037, USA; International AIDS Vaccine Initiative, New York, NY 10004, USA
| | - Karen L Saye-Francisco
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Trevor Biddle
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Sanjay Mohan
- Department of Medicine, University of California San Diego, San Diego, CA 92103, USA
| | - Thomas Vollbrecht
- Department of Medicine, University of California San Diego, San Diego, CA 92103, USA
| | - Oleksander Kalyuzhniy
- International AIDS Vaccine Initiative Neutralizing Antibody Center, La Jolla, CA 92037, USA; International AIDS Vaccine Initiative, New York, NY 10004, USA
| | - Sharon Madzorera
- Centre for HIV and STIs, National Institute for Communicable Diseases, of the National Health Laboratory Service (NHLS), Johannesburg 2131, South Africa
| | - Dale Kitchin
- Centre for HIV and STIs, National Institute for Communicable Diseases, of the National Health Laboratory Service (NHLS), Johannesburg 2131, South Africa
| | - Bronwen Lambson
- Centre for HIV and STIs, National Institute for Communicable Diseases, of the National Health Laboratory Service (NHLS), Johannesburg 2131, South Africa
| | - Molati Nonyane
- Centre for HIV and STIs, National Institute for Communicable Diseases, of the National Health Laboratory Service (NHLS), Johannesburg 2131, South Africa
| | | | - Pascal Poignard
- International AIDS Vaccine Initiative Neutralizing Antibody Center, La Jolla, CA 92037, USA; Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA; Institut de Biologie Structurale, Université Grenoble Alpes, Commissariat a l'Energie Atomique, Centre National de Recherche Scientifique and Centre Hospitalier Universitaire Grenoble Alpes, 38044 Grenoble, France
| | - William R Schief
- International AIDS Vaccine Initiative Neutralizing Antibody Center, La Jolla, CA 92037, USA; Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA; Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery (CHAVI-ID) The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Dennis R Burton
- International AIDS Vaccine Initiative Neutralizing Antibody Center, La Jolla, CA 92037, USA; Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA; Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery (CHAVI-ID) The Scripps Research Institute, La Jolla, CA 92037, USA; Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology, and Harvard, Cambridge, MA 02114, USA
| | - Ben Murrell
- Department of Medicine, University of California San Diego, San Diego, CA 92103, USA; Department of Microbiology, Tumor and Cell biology, Karolinska Institutet, Stockholm, Sweden
| | - Penny L Moore
- Centre for HIV and STIs, National Institute for Communicable Diseases, of the National Health Laboratory Service (NHLS), Johannesburg 2131, South Africa; School of Pathology Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 2050, South Africa; Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of Kwa-Zulu Natal, Durban 4013, South Africa
| | - Bryan Briney
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA; Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery (CHAVI-ID) The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Devin Sok
- International AIDS Vaccine Initiative Neutralizing Antibody Center, La Jolla, CA 92037, USA; International AIDS Vaccine Initiative, New York, NY 10004, USA; Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA; Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery (CHAVI-ID) The Scripps Research Institute, La Jolla, CA 92037, USA.
| | - Elise Landais
- International AIDS Vaccine Initiative Neutralizing Antibody Center, La Jolla, CA 92037, USA; International AIDS Vaccine Initiative, New York, NY 10004, USA; Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA.
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5
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Mabvakure B, Scheepers C, Nonyane M, Lambson B, Madzorera S, Kitchin D, Bhiman J, Wibmer K, Abdool Karim S, Williamson C, Morris L, Moore PL. A38 Diversity analyses of HIV-1 envelope glycoproteins in HIV-infected individuals with and without broadly neutralizing antibodies. Virus Evol 2017; 3:vew036.037. [PMID: 28845277 PMCID: PMC5565991 DOI: 10.1093/ve/vew036.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- B Mabvakure
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
| | - C Scheepers
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
| | - M Nonyane
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
| | - B Lambson
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
| | - S Madzorera
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
| | - D Kitchin
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
| | - J Bhiman
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
| | - K Wibmer
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
| | - S Abdool Karim
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Kwa-Zulu Natal
| | - C Williamson
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Kwa-Zulu Natal
| | - L Morris
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
| | - P L Moore
- National Health Laboratory Service, Center for HIV and STIs, National Institute for Communicable Diseases, Johannesburg
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6
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Trama AM, Moody MA, Alam SM, Jaeger FH, Lockwood B, Parks R, Lloyd KE, Stolarchuk C, Scearce R, Foulger A, Marshall DJ, Whitesides JF, Jeffries TL, Wiehe K, Morris L, Lambson B, Soderberg K, Hwang KK, Tomaras GD, Vandergrift N, Jackson KJL, Roskin KM, Boyd SD, Kepler TB, Liao HX, Haynes BF. HIV-1 envelope gp41 antibodies can originate from terminal ileum B cells that share cross-reactivity with commensal bacteria. Cell Host Microbe 2015; 16:215-226. [PMID: 25121750 DOI: 10.1016/j.chom.2014.07.003] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 06/08/2014] [Accepted: 07/01/2014] [Indexed: 12/23/2022]
Abstract
Monoclonal antibodies derived from blood plasma cells of acute HIV-1-infected individuals are predominantly targeted to the HIV Env gp41 and cross-reactive with commensal bacteria. To understand this phenomenon, we examined anti-HIV responses in ileum B cells using recombinant antibody technology and probed their relationship to commensal bacteria. The dominant ileum B cell response was to Env gp41. Remarkably, a majority (82%) of the ileum anti-gp41 antibodies cross-reacted with commensal bacteria, and of those, 43% showed non-HIV-1 antigen polyreactivity. Pyrosequencing revealed shared HIV-1 antibody clonal lineages between ileum and blood. Mutated immunoglobulin G antibodies cross-reactive with both Env gp41 and microbiota could also be isolated from the ileum of HIV-1 uninfected individuals. Thus, the gp41 commensal bacterial antigen cross-reactive antibodies originate in the intestine, and the gp41 Env response in HIV-1 infection can be derived from a preinfection memory B cell pool triggered by commensal bacteria that cross-react with Env.
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Affiliation(s)
- Ashley M Trama
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Immunology, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA.
| | - M Anthony Moody
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Pediatrics, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - S Munir Alam
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Frederick H Jaeger
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Bradley Lockwood
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Robert Parks
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Krissey E Lloyd
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Christina Stolarchuk
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Richard Scearce
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Andrew Foulger
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Dawn J Marshall
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - John F Whitesides
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Thomas L Jeffries
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Kevin Wiehe
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Lynn Morris
- Centre for HIV and STIs, National Institute for Communicable Diseases, Johannesburg 2131, South Africa
| | - Bronwen Lambson
- Centre for HIV and STIs, National Institute for Communicable Diseases, Johannesburg 2131, South Africa
| | - Kelly Soderberg
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Kwan-Ki Hwang
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Georgia D Tomaras
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Surgery, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Molecular Genetics and Microbiology, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Nathan Vandergrift
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | | | - Krishna M Roskin
- Department of Pathology, Stanford University, Palo Alto, CA 94305, USA
| | - Scott D Boyd
- Department of Pathology, Stanford University, Palo Alto, CA 94305, USA
| | - Thomas B Kepler
- Department of Microbiology, Boston University, Boston, MA 02215, USA
| | - Hua-Xin Liao
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA
| | - Barton F Haynes
- Duke Human Vaccine Institute, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Immunology, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA; Department of Medicine, Duke University School of Medicine and Duke Global Health Institute, Durham, NC 27710, USA.
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7
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Richardson SI, Gray E, Mkhize N, Sheward D, Lambson B, Wibmer K, Masson L, Werner L, Garett N, Passmore JA, Abdool-Karim S, Williamson C, Moore P, Morris L. The Sequence of the α4β7-binding Motif on Gp120 of Transmitted/Founder Viruses Contributes to the Dependence on the Integrin for HIV Infection. AIDS Res Hum Retroviruses 2014. [DOI: 10.1089/aid.2014.5099.abstract] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Simone I. Richardson
- Centre for HIV and STI's, National Institute for Communicable Diseases, Johannesburg, South Africa
- School of Pathology, University of the Witwatersrand, Johannesburg, South Africa
| | - Elin Gray
- Centre for HIV and STI's, National Institute for Communicable Diseases, Johannesburg, South Africa
| | - Nonhlanhla Mkhize
- Centre for HIV and STI's, National Institute for Communicable Diseases, Johannesburg, South Africa
- School of Pathology, University of the Witwatersrand, Johannesburg, South Africa
| | - Daniel Sheward
- Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Bronwen Lambson
- Centre for HIV and STI's, National Institute for Communicable Diseases, Johannesburg, South Africa
- School of Pathology, University of the Witwatersrand, Johannesburg, South Africa
| | - Kurt Wibmer
- Centre for HIV and STI's, National Institute for Communicable Diseases, Johannesburg, South Africa
- School of Pathology, University of the Witwatersrand, Johannesburg, South Africa
| | - Lindi Masson
- Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Lise Werner
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Nigel Garett
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Jo-Ann Passmore
- Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Salim Abdool-Karim
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Carolyn Williamson
- Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Penny Moore
- Centre for HIV and STI's, National Institute for Communicable Diseases, Johannesburg, South Africa
- School of Pathology, University of the Witwatersrand, Johannesburg, South Africa
| | - Lynn Morris
- Centre for HIV and STI's, National Institute for Communicable Diseases, Johannesburg, South Africa
- School of Pathology, University of the Witwatersrand, Johannesburg, South Africa
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8
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Scheepers C, Naicker D, Schramm C, Sheng Z, Ismail A, Karim SSA, Lambson B, Moore P, Shapiro L, Morris L. Strain Specific Anti-HIV Antibody Evolution during Acute Infection and Viral Escape. AIDS Res Hum Retroviruses 2014. [DOI: 10.1089/aid.2014.5455.abstract] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Cathrine Scheepers
- Center for HIV and STIs, National Institute for Communicable Diseases (NICD), Sandringham, South Africa
- University of the Witwatersrand, Virology, Sandringham, South Africa
| | - Dshanta Naicker
- Center for HIV and STIs, National Institute for Communicable Diseases (NICD), Sandringham, South Africa
| | - Chaim Schramm
- Columbia University, Biochemistry and Molecular Biophysics and Department of Systems Biology, New York, NY, United States
| | - Zhizhang Sheng
- Columbia University, Biochemistry and Molecular Biophysics and Department of Systems Biology, New York, NY, United States
| | - Arshad Ismail
- Center for HIV and STIs, National Institute for Communicable Diseases (NICD), Sandringham, South Africa
| | - Salim S. Abdool Karim
- Center for the AIDS Programme of Research in South Africa (CAPRISA), Durban, South Africa
| | - Bronwen Lambson
- Center for HIV and STIs, National Institute for Communicable Diseases (NICD), Sandringham, South Africa
| | - Penny Moore
- Center for HIV and STIs, National Institute for Communicable Diseases (NICD), Sandringham, South Africa
- University of the Witwatersrand, Virology, Sandringham, South Africa
- Center for the AIDS Programme of Research in South Africa (CAPRISA), Durban, South Africa
| | - Lawrence Shapiro
- Columbia University, Biochemistry and Molecular Biophysics and Department of Systems Biology, New York, NY, United States
| | - Lynn Morris
- Center for HIV and STIs, National Institute for Communicable Diseases (NICD), Sandringham, South Africa
- University of the Witwatersrand, Virology, Sandringham, South Africa
- Center for the AIDS Programme of Research in South Africa (CAPRISA), Durban, South Africa
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9
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Guerbouj S, Djilani F, Bettaieb J, Lambson B, Diouani MF, Ben Salah A, Ben Ismail R, Guizani I. Evaluation of a gp63-PCR based assay as a molecular diagnosis tool in canine leishmaniasis in Tunisia. PLoS One 2014; 9:e105419. [PMID: 25153833 PMCID: PMC4143256 DOI: 10.1371/journal.pone.0105419] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 07/12/2014] [Indexed: 01/27/2023] Open
Abstract
A gp63PCR method was evaluated for the detection and characterization of Leishmania (Leishmania) (L.) parasites in canine lymph node aspirates. This tool was tested and compared to other PCRs based on the amplification of 18S ribosomal genes, a L. infantum specific repetitive sequence and kinetoplastic DNA minicircles, and to classical parasitological (smear examination and/or culture) or serological (IFAT) techniques on a sample of 40 dogs, originating from different L. infantum endemic regions in Tunisia. Sensitivity and specificity of all the PCR assays were evaluated on parasitologically confirmed dogs within this sample (N = 18) and control dogs (N = 45) originating from non–endemic countries in northern Europe and Australia. The gp63 PCR had 83.5% sensitivity and 100% specificity, a performance comparable to the kinetoplast PCR assay and better than the other assays. These assays had comparable results when the gels were southern transferred and hybridized with a radioactive probe. As different infection rates were found according to the technique, concordance of the results was estimated by (κ) test. Best concordance values were between the gp63PCR and parasitological methods (74.6%, 95% confidence intervals CI: 58.8–95.4%) or serology IFAT technique (47.4%, 95% CI: 23.5–71.3%). However, taken together Gp63 and Rib assays covered most of the samples found positive making of them a good alternative for determination of infection rates. Potential of the gp63PCR-RFLP assay for analysis of parasite genetic diversity within samples was also evaluated using 5 restriction enzymes. RFLP analysis confirmed assignment of the parasites infecting the dogs to L. infantum species and illustrated occurrence of multiple variants in the different endemic foci. Gp63 PCR assay thus constitutes a useful tool in molecular diagnosis of L. infantum infections in dogs in Tunisia.
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Affiliation(s)
- Souheila Guerbouj
- Laboratory of Molecular Epidemiology and Experimental Pathology, Pasteur Institute of Tunis, Université de Tunis el Manar, Tunis, Tunisia
- Laboratory of Epidemiology and Ecology of Parasitic Diseases, Pasteur Institute of Tunis, Tunis, Tunisia
| | - Fattouma Djilani
- Laboratory of Epidemiology and Ecology of Parasitic Diseases, Pasteur Institute of Tunis, Tunis, Tunisia
| | - Jihene Bettaieb
- Laboratory of Medical Epidemiology, Pasteur Institute of Tunis, Tunis, Tunisia
| | - Bronwen Lambson
- Molteno Institute for Parasitology, Department of Pathology, University of Cambridge, Cambridge, United Kingdom
| | - Mohamed Fethi Diouani
- Laboratory of Epidemiology and Ecology of Parasitic Diseases, Pasteur Institute of Tunis, Tunis, Tunisia
| | - Afif Ben Salah
- Laboratory of Medical Epidemiology, Pasteur Institute of Tunis, Tunis, Tunisia
| | - Riadh Ben Ismail
- Laboratory of Epidemiology and Ecology of Parasitic Diseases, Pasteur Institute of Tunis, Tunis, Tunisia
| | - Ikram Guizani
- Laboratory of Molecular Epidemiology and Experimental Pathology, Pasteur Institute of Tunis, Université de Tunis el Manar, Tunis, Tunisia
- Laboratory of Epidemiology and Ecology of Parasitic Diseases, Pasteur Institute of Tunis, Tunis, Tunisia
- * E-mail:
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10
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Gray ES, Moody MA, Wibmer CK, Chen X, Marshall D, Amos J, Moore PL, Foulger A, Yu JS, Lambson B, Abdool Karim S, Whitesides J, Tomaras GD, Haynes BF, Morris L, Liao HX. Isolation of a monoclonal antibody that targets the alpha-2 helix of gp120 and represents the initial autologous neutralizing-antibody response in an HIV-1 subtype C-infected individual. J Virol 2011; 85:7719-29. [PMID: 21613396 PMCID: PMC3147894 DOI: 10.1128/jvi.00563-11] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Accepted: 05/12/2011] [Indexed: 11/20/2022] Open
Abstract
The C3-V4 region is a major target of autologous neutralizing antibodies in HIV-1 subtype C infection. We previously identified a Center for AIDS Program of Research in South Africa (CAPRISA) participant, CAP88, who developed a potent neutralizing-antibody response within 3 months of infection that targeted an epitope in the C3 region of the HIV-1 envelope (P. L. Moore et al., PLoS Pathog. 5:e1000598, 2009). Here we showed that these type-specific antibodies could be adsorbed using recombinant gp120 from the transmitted/founder virus from CAP88 but not by gp120 made from other isolates. Furthermore, this activity could be depleted using a chimeric gp120 protein that contained only the C3 region from the CAP88 viral envelope engrafted onto the unrelated CAP63 viral envelope (called 63-88C3). On the basis of this, a differential sorting of memory B cells was performed using gp120s made from 63-88C3 and CAP63 labeled with different fluorochromes as positive and negative probes, respectively. This strategy resulted in the isolation of a highly specific monoclonal antibody (MAb), called CAP88-CH06, that neutralized the CAP88 transmitted/founder virus and viruses from acute infection but was unable to neutralize CAP88 viruses isolated at 6 and 12 months postinfection. The latter viruses contained 2 amino acid changes in the alpha-2 helix of C3 that mediated escape from this MAb. One of these changes involved the introduction of an N-linked glycan at position 339 that occluded the epitope, while the other mutation (either E343K or E350K) was a charge change. Our data validate the use of differential sorting to isolate a MAb targeting a specific epitope in the envelope glycoprotein and provided insights into the mechanisms of autologous neutralization escape.
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Affiliation(s)
- Elin S. Gray
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
- National Institute for Communicable Diseases, Sandringham
| | - M. Anthony Moody
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Constantinos Kurt Wibmer
- National Institute for Communicable Diseases, Sandringham
- University of Witwatersrand, Johannesburg, South Africa
| | - Xi Chen
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Dawn Marshall
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Joshua Amos
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Penny L. Moore
- National Institute for Communicable Diseases, Sandringham
- University of Witwatersrand, Johannesburg, South Africa
| | - Andrew Foulger
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Jae-Sung Yu
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
| | | | - Salim Abdool Karim
- Center for AIDS Program of Research in South Africa (CAPRISA), University of KwaZulu Natal, Durban, South Africa
| | - John Whitesides
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Georgia D. Tomaras
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Barton F. Haynes
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Lynn Morris
- National Institute for Communicable Diseases, Sandringham
- University of Witwatersrand, Johannesburg, South Africa
| | - Hua-Xin Liao
- Duke Human Vaccine Institute and Departments of Medicine, Pediatrics, Surgery and Immunology, Duke University School of Medicine, Durham, North Carolina 27710
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11
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Moore P, Gray E, Madiga M, Ranchobe N, Lambson B, Abrahams MR, Bandawe G, Sheward D, Thebus R, Mlisana K, Karim SA, Williamson C, Morris L. Understanding Anti-HIV Antibody Targets. Int J Infect Dis 2010. [DOI: 10.1016/j.ijid.2010.02.1529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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12
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Moore PL, Ranchobe N, Lambson B, Gray E, Mlisana K, Karim SA, Williamson C, Gnanakaran S, Morris L. P09-04. Charge changes in the alpha2-helix in the C3 region of the HIV-1 subtype C envelope mediate neutralization escape. Retrovirology 2009. [PMCID: PMC2767601 DOI: 10.1186/1742-4690-6-s3-p117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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13
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Lambson B, Nene V, Obura M, Shah T, Pandit P, Ole-Moiyoi O, Delroux K, Welburn S, Skilton R, de Villiers E, Bishop R. Identification of candidate sialome components expressed in ixodid tick salivary glands using secretion signal complementation in mammalian cells. Insect Mol Biol 2005; 14:403-14. [PMID: 16033433 DOI: 10.1111/j.1365-2583.2005.00571.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Ixodid ticks manipulate mammalian host pathways by secreting molecules from salivary glands. Novel cDNAs containing functional secretion signals were isolated from ixodid tick salivary glands using a signal sequence trap. Only 15/61 Rhipicephalus appendiculatus and 1/7 Amblyomma variegatum cDNAs had significant identity (< 1e-15) to previously identified sequences. Polypeptides that may interact with host pathways included a kinase inhibitor. Two proteins encoded homologues of the yolk protein vitellogenin and seventeen contained glycine-rich motifs. Four proteins without sequence matches had conserved structural folds, identified using a Threading algorithm. Predicted secretion signals were between fifteen and fifty-seven amino acids long. Four homologous polymorphic proteins contained conserved (26/27 residues) signal peptides. Ten functional tick secretion signals could not be unambiguously identified using predictive algorithms.
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Affiliation(s)
- B Lambson
- The International Livestock Research Institute (ILRI), Nairobi, Kenya
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14
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Bishop R, Lambson B, Wells C, Pandit P, Osaso J, Nkonge C, Morzaria S, Musoke A, Nene V. A cement protein of the tick Rhipicephalus appendiculatus, located in the secretory e cell granules of the type III salivary gland acini, induces strong antibody responses in cattle. Int J Parasitol 2002; 32:833-42. [PMID: 12062554 DOI: 10.1016/s0020-7519(02)00027-9] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Protein components of the cement cone of ixodid ticks are candidates for inclusion in vaccines against tick infestation, since they are essential for tick attachment and feeding. We describe here the cloning of a cDNA encoding a 36 kDa protein, designated Rhipicephalus Immuno-dominant Molecule 36 (RIM36), present in salivary glands and the cement cone material secreted by Rhipicephalus appendiculatus. The 334-amino-acid sequence of RIM36 has a high content of glycine, serine and proline. The protein contains a predicted N-terminal signal peptide and two classes of glycine-rich amino acid repeats, a GL[G/Y/S/F/L] tripeptide and a GSPLSGF septapeptide. Comparison of genomic and cDNA sequences reveals a 597 bp intron within the 3' end of the RIM36 gene. Immuno-electron microscopy demonstrates that RIM36 is predominantly located in the e cell granules of the type III salivary gland acini. An Escherichia coli recombinant form of the proline-rich C-terminal domain of RIM36 reacts with antisera from Bos indicus cattle, either experimentally infested with R. appendiculatus, or exposed to ticks in the field. The 36 kDa protein is strongly recognised on Western blots of salivary gland lysates and soluble extracts of purified R. appendiculatus cement cones by polyclonal antibodies generated against recombinant RIM36, and by antisera from cattle experimentally infested with ticks. The data indicate that this tick cement component is a target of strong antibody responses in cattle exposed to feeding ticks.
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Affiliation(s)
- Richard Bishop
- International Livestock Research Institute (ILRI), P.O. Box 30709, Nairobi, Kenya.
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15
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Abstract
Leishmania minicircular deoxyribonucleic acid (DNA) is arranged into different classes according to sequence. These classes differ substantially in sequence, despite species- and genus-specific regions, and are present in widely different copy numbers within and between Leishmania strains. Homologous minicircles have been identified in different species of Leishmania by comparing sequences of known minicircles. However, it is possible to select for minicircles of the same class by amplifying Leishmania DNA with polymerase chain reaction primers from the conserved and variable regions. This approach was used with 2 different minicircle classes in the L. donovani complex. In all isolates tested it was possible to amplify minicircles of the selected class.
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Affiliation(s)
- Bronwen Lambson
- Molteno Laboratories, Department of Pathology, University of Cambridge, Cambridge, UK.
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16
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Quinnell RJ, Courtenay O, Davidson S, Garcez L, Lambson B, Ramos P, Shaw JJ, Shaw MA, Dye C. Detection of Leishmania infantum by PCR, serology and cellular immune response in a cohort study of Brazilian dogs. Parasitology 2001; 122:253-61. [PMID: 11289062 DOI: 10.1017/s0031182001007363] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The sensitivity and specificity of PCR, serology (ELISA) and lymphoproliferative response to Leishmania antigen for the detection of Leishmania infantum infection were evaluated in a cohort of 126 dogs exposed to natural infection in Brazil. For PCR, Leishmania DNA from bone-marrow was amplified with both minicircle and ribosomal primers. The infection status and time of infection of each dog were estimated from longitudinal data. The sensitivity of PCR in parasite-positive samples was 98%. However, the overall sensitivity of PCR in post-infection samples, from dogs with confirmed infection, was only 68%. The sensitivity of PCR varied during the course of infection, being highest (78-88%) 0-135 days post-infection and declining to around 50% after 300 days. The sensitivity of PCR also varied between dogs, and was highest in sick dogs. The sensitivity of serology was similar in parasite-positive (84%), PCR-positive (86%) and post-infection (88%) samples. The sensitivity of serology varied during the course of infection, being lowest at the time of infection and high (93-100%) thereafter. Problems in determining the specificity of serology are discussed. The sensitivity and specificity of cellular responsiveness were low. These data suggest that PCR is most useful in detecting active or symptomatic infection, and that serology can be a more sensitive technique for the detection of all infected dogs.
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Lambson B, Smyth A, Barker DC. Leishmania donovani: development and characterisation of a kinetoplast DNA probe and its use in the detection of parasites. Exp Parasitol 2000; 94:15-22. [PMID: 10631076 DOI: 10.1006/expr.1999.4458] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The polymerase chain reaction is used increasingly widely for the diagnosis of both cutaneous and visceral leishmaniasis and for the identification of asymptomatic carriers in the population in endemic disease areas. The use of complex-specific hybridisation probes in conjunction with the polymerase chain reaction increases the specificity as well as the sensitivity of the diagnostic procedure as it discriminates between different infecting Leishmania species. A minicircle kinetoplast DNA probe, B4 Rsa, which hybridizes to all members of the Leishmania (L.) donovani complex has been identified and characterised. It is a segment of a minicircle highly conserved in Bangladeshi and Indian L. (L.) donovani isolates.
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Affiliation(s)
- B Lambson
- Molteno Laboratory, Department of Pathology, University of Cambridge, Tennis Court Road, U.K., CB2 1QP
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Ibrahim ME, Lambson B, Yousif AO, Deifalla NS, Alnaiem DA, Ismail A, Yousif H, Ghalib HW, Khalil EA, Kadaro A, Barker DC, El Hassan AM. Kala-azar in a high transmission focus: an ethnic and geographic dimension. Am J Trop Med Hyg 1999; 61:941-4. [PMID: 10674674 DOI: 10.4269/ajtmh.1999.61.941] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
In 1994-1996, we studied a group of 58 game wardens stationed in an area known to be highly endemic for visceral leishmaniasis (kala-azar) for evidence of infection with Leishmania donovani. Leishmania DNA was detected by the polymerase chain reaction in the peripheral blood of cases of active kala-azar, former patients with visceral leishmaniasis, patients, and asymptomatic subjects. Using the cloned antigen rk39, antibodies were detected in 44.2% of the game wardens while leishmanin skin test result was positive in 77% of our sample. It was shown that certain tribes from northern Sudan were more likely to develop subclinical infections, while those of the Baria tribe from southern Sudan and those of the Nuba tribe from western Sudan were more likely to develop visceral leishmaniasis. Whether this is due to genetic factors or previous exposure to Leishmania parasites remains to be elucidated.
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Affiliation(s)
- M E Ibrahim
- Leishmaniasis Research Group, Institute of Endemic Diseases, University of Khartoum, Sudan
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Russell R, Iribar MP, Lambson B, Brewster S, Blackwell JM, Dye C, Ajioka JW. Intra and inter-specific microsatellite variation in the Leishmania subgenus Viannia. Mol Biochem Parasitol 1999; 103:71-7. [PMID: 10514082 DOI: 10.1016/s0166-6851(99)00117-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Leishmania species of the subgenus Viannia are responsible for a large proportion of New World leishmaniasis. Here we report the development of a set of microsatellite markers which are able to discriminate between all species within the subgenus Viannia, including the closely related species pairs: Leishmania (V.) braziliensis and Leishmania (V.) peruviana; Leishmania (V.) panamensis and Leishmania (V.) guyanensis. Potential species hybrids were uncovered in the analysis. These markers are sufficiently polymorphic such that within-species epidemiological, population and genetic studies are theoretically possible for all species analyzed.
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Affiliation(s)
- R Russell
- Department of Pathology, University of Cambridge, UK
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Affiliation(s)
- B Lambson
- Department of Pathology, University of Cambridge, UK.
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Scrimgeour EM, Windsor JJ, Shetty MK, Banodkar DD, Lambson B, Barker DC, Idris MA, McCann SH, al-Suwaid AR. Leishmania tropica is a probable cause of cutaneous leishmaniasis in the Sultanate of Oman: case report in a Pakistani resident. Trans R Soc Trop Med Hyg 1999; 93:233-4. [PMID: 10492747 DOI: 10.1016/s0035-9203(99)90003-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- E M Scrimgeour
- Department of Medicine, Sultan Qaboos University, Al-Khod, Muscat, Sultanate of Oman.
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Abstract
In this study, we have sequenced more than 100 clones of minicircle DNA from Herpetomonas samuelpessoai. An unusual amplification approach was developed to amplify minicircle DNA by using a pair of complementary primers designed from a universal stretch of minicircle sequence. Sequence analysis shows that the kinetoplast minicircles in Herpetomonas with a size of 1.3 kb are organised into two conserved regions and two variable regions which are located 180 degrees apart. The potential gRNA genes are encoded in variable regions of minicircle approximately 360 bp from CSB-3 (conserved sequence block 3). A conserved upstream sequence located 30 nt before the gRNA genes was identified and is related to the gRNA genes in sequence organisation. A potential role(s) of this sequence in gRNA transcription is discussed.
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Affiliation(s)
- G Fu
- Department of Pathology, University of Cambridge, UK
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Scrimgeour EM, Barker DC, al-Waily A, Idris M, Lambson B, Nirmala V, Windsor JJ. First identification of a species of Leishmania causing visceral leishmaniasis in the Sultanate of Oman, in a patient with AIDS. Trans R Soc Trop Med Hyg 1998; 92:356-7. [PMID: 9861419 DOI: 10.1016/s0035-9203(98)91042-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- E M Scrimgeour
- Department of Medicine, Sultan Qaboos University, Al-Khod, Oman
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Sargent CA, Briggs H, Chalmers IJ, Lambson B, Walker E, Affara NA. The sequence organization of Yp/proximal Xq homologous regions of the human sex chromosomes is highly conserved. Genomics 1996; 32:200-9. [PMID: 8833146 DOI: 10.1006/geno.1996.0106] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Detailed deletion analysis of patients with breakpoints in Yp has allowed the definition of two distinct intervals on the Y chromosome short arm outside the pseudoautosomal region that are homologous to Xq2l.3. Detailed YAC contigs have been developed over these regions on both the X and Y chromosomes, and the relative order of markers has been compared to assess whether rearrangements on either sex chromosome have occurred since the transposition events creating these patterns of homology. On the X chromosome, the region forms almost one contiguous block of homology, whereas on the Y chromosome, there has been one major rearrangement leading to the two separate Yp-Xq2l blocks of homology. The rearrangement breakpoint has been mapped. Within these separate X-Y homologous blocks on Yp, the order of loci homologous to X has been conserved to a high degree between the sex chromosomes. With the exception of the amelogenin gene (proximal Yp block), all the XY homologous sequences in the two Yp blocks have homolognes in Xq2l.3, with the former having its X counterpart in Xp22.2. This suggests an independent evolutionary event leading to the formation of the amelogenin X-Y homology.
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Affiliation(s)
- C A Sargent
- Human Molecular Genetics Group, University of Cambridge Department of Pathology, UK
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Jones MH, Khwaja OS, Briggs H, Lambson B, Davey PM, Chalmers J, Zhou CY, Walker EM, Zhang Y, Todd C. A set of ninety-seven overlapping yeast artificial chromosome clones spanning the human Y chromosome euchromatin. Genomics 1994; 24:266-75. [PMID: 7698748 DOI: 10.1006/geno.1994.1615] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Contiguous arrays of yeast artificial chromosomes (YACs) extending from proximal heterochromatic Yq into the pseudoautosomal portion of the Y chromosome and separated by a small interval at the centromere have been constructed. A total of 97 YACs have been aligned along the Y chromosome by STS content analysis using 222 sequence tagged sites (STSs) that detect 263 loci. Forty-five of the STSs used are novel. Their inclusion provides a significant improvement over previously available maps on the density of STS coverage along the Y chromosome, reducing the average spacing to 120 kb assuming a length of 30 Mb for the euchromatin. The average size of 61 YACs determined by pulsed-field gel electrophoresis analysis was at least 0.9 Mb. Minor differences noted between the ordering of STSs on this map compared with those previously reported may be attributed to inherent polymorphism between the Y chromosomes used to construct the YAC libraries.
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Affiliation(s)
- M H Jones
- University of Cambridge Department of Pathology, United Kingdom
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Abstract
Cloned DNA sequences from 18 X-Y homologous loci have been used to examine the evolution of regions of homology between the human X and Y chromosomes. The pattern of X-Y linkage in different primate species has enabled the charting of the chronology of their appearance and removal from the sex chromosomes during evolution. Examination of the pattern of differences in restriction enzyme sites at different loci has been used to estimate the degree of divergence in three different regions of homology. These studies have indicated that (1) blocks of homology have arisen at different points in evolution, (2) different regions of homology are heterogeneous in composition in that they contain X-Y homologous sequences of different age, and (3) the combination of X and Y locations together with the point of evolutionary origin has defined five new patterns of homology.
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Affiliation(s)
- B Lambson
- Department of Pathology, University of Cambridge, England
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