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Potgieter RL, Mwangi PN, Mogotsi MT, Uwimana J, Mutesa L, Muganga N, Murenzi D, Tusiyenge L, Seheri ML, Steele AD, Mwenda JM, Nyaga MM. Genomic Analysis of Rwandan G9P[8] Rotavirus Strains Pre- and Post-RotaTeq ® Vaccine Reveals Significant Distinct Sub-Clustering in a Post-Vaccination Cohort. Viruses 2023; 15:2321. [PMID: 38140562 PMCID: PMC10747556 DOI: 10.3390/v15122321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/16/2023] [Accepted: 11/23/2023] [Indexed: 12/24/2023] Open
Abstract
Although the introduction of rotavirus vaccines has substantially contributed to the reduction in rotavirus morbidity and mortality, concerns persist about the re-emergence of variant strains that might alter vaccine effectiveness in the long term. The G9 strains re-emerged in Africa during the mid-1990s and have more recently become predominant in some countries, such as Ghana and Zambia. In Rwanda, during the 2011 to 2015 routine surveillance period, G9P[8] persisted during both the pre- and post-vaccine periods. The pre-vaccination cohort was based on the surveillance period of 2011 to 2012, and the post-vaccination cohort was based on the period of 2013 to 2015, excluding 2014. The RotaTeq® vaccine that was first introduced in Rwanda in 2012 is genotypically heterologous to Viral Protein 7 (VP7) G9. This study elucidated the whole genome of Rwandan G9P[8] rotavirus strains pre- and post-RotaTeq® vaccine introduction. Fecal samples from Rwandan children under the age of five years (pre-vaccine n = 23; post-vaccine n = 7), conventionally genotyped and identified as G9P[8], were included. Whole-genome sequencing was then performed using the Illumina® MiSeq platform. Phylogenetic analysis and pair-wise sequence analysis were performed using MEGA6 software. Distinct clustering of three post-vaccination study strains was observed in all 11 gene segments, compared to the other Rwandan G9P[8] study strains. Specific amino acid differences were identified across the gene segments of these three 2015 post-vaccine strains. Important amino acid differences were identified at position N242S in the VP7 genome segment of the three post-vaccine G9 strains compared to the other G9 strains. This substitution occurs at a neutralization epitope site and may slightly affect protein interaction at that position. These findings indicate that the Rwandan G9P[8] strains revealed a distinct sub-clustering pattern among post-vaccination study strains circulating in Rwanda, with changes at neutralization epitopes, which may play a role in neutralization escape from vaccine candidates. This emphasizes the need for continuous whole-genome surveillance to better understand the evolution and epidemiology of the G9P[8] strains post-vaccination.
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Affiliation(s)
- Robyn-Lee Potgieter
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa; (R.-L.P.); (P.N.M.); (M.T.M.)
| | - Peter N. Mwangi
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa; (R.-L.P.); (P.N.M.); (M.T.M.)
| | - Milton T. Mogotsi
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa; (R.-L.P.); (P.N.M.); (M.T.M.)
| | - Jeannine Uwimana
- Department of Pediatrics, Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda; (J.U.); (L.M.); (N.M.); (D.M.); (L.T.)
| | - Leon Mutesa
- Department of Pediatrics, Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda; (J.U.); (L.M.); (N.M.); (D.M.); (L.T.)
- Centre for Human Genetics, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda
| | - Narcisse Muganga
- Department of Pediatrics, Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda; (J.U.); (L.M.); (N.M.); (D.M.); (L.T.)
| | - Didier Murenzi
- Department of Pediatrics, Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda; (J.U.); (L.M.); (N.M.); (D.M.); (L.T.)
| | - Lisine Tusiyenge
- Department of Pediatrics, Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda; (J.U.); (L.M.); (N.M.); (D.M.); (L.T.)
| | - Mapaseka L. Seheri
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa, Pretoria 0204, South Africa; (M.L.S.); (A.D.S.)
| | - A. Duncan Steele
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa, Pretoria 0204, South Africa; (M.L.S.); (A.D.S.)
| | - Jason M. Mwenda
- World Health Organization, Regional Office for Africa, Brazzaville P.O. Box 06, Congo;
| | - Martin M. Nyaga
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa; (R.-L.P.); (P.N.M.); (M.T.M.)
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2
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Mhango C, Banda A, Chinyama E, Mandolo JJ, Kumwenda O, Malamba-Banda C, Barnes KG, Kumwenda B, Jambo KC, Donato CM, Esona MD, Mwangi PN, Steele AD, Iturriza-Gomara M, Cunliffe NA, Ndze VN, Kamng’ona AW, Dennis FE, Nyaga MM, Chaguza C, Jere KC. Comparative whole genome analysis reveals re-emergence of human Wa-like and DS-1-like G3 rotaviruses after Rotarix vaccine introduction in Malawi. Virus Evol 2023; 9:vead030. [PMID: 37305707 PMCID: PMC10256189 DOI: 10.1093/ve/vead030] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 04/12/2023] [Accepted: 05/10/2023] [Indexed: 06/13/2023] Open
Abstract
G3 rotaviruses rank among the most common rotavirus strains worldwide in humans and animals. However, despite a robust long-term rotavirus surveillance system from 1997 at Queen Elizabeth Central Hospital in Blantyre, Malawi, these strains were only detected from 1997 to 1999 and then disappeared and re-emerged in 2017, 5 years after the introduction of the Rotarix rotavirus vaccine. Here, we analysed representative twenty-seven whole genome sequences (G3P[4], n = 20; G3P[6], n = 1; and G3P[8], n = 6) randomly selected each month between November 2017 and August 2019 to understand how G3 strains re-emerged in Malawi. We found four genotype constellations that were associated with the emergent G3 strains and co-circulated in Malawi post-Rotarix vaccine introduction: G3P[4] and G3P[6] strains with the DS-1-like genetic backbone genes (G3-P[4]-I2-R2-C2-M2-A2-N2-T2-E2-H2 and G3-P[6]-I2-R2-C2-M2-A2-N2-T2-E2-H2), G3P[8] strains with the Wa-like genetic backbone genes (G3-P[8]-I1-R1-C1-M1-A1-N1-T1-E1-H1), and reassortant G3P[4] strains consisting of the DS-1-like genetic backbone genes and a Wa-like NSP2 (N1) gene (G3-P[4]-I2-R2-C2-M2-A2-N1-T2-E2-H2). Time-resolved phylogenetic trees demonstrated that the most recent common ancestor for each ribonucleic acid (RNA) segment of the emergent G3 strains was between 1996 and 2012, possibly through introductions from outside the country due to the limited genetic similarity with G3 strains which circulated before their disappearance in the late 1990s. Further genomic analysis revealed that the reassortant DS-1-like G3P[4] strains acquired a Wa-like NSP2 genome segment (N1 genotype) through intergenogroup reassortment; an artiodactyl-like VP3 through intergenogroup interspecies reassortment; and VP6, NSP1, and NSP4 segments through intragenogroup reassortment likely before importation into Malawi. Additionally, the emergent G3 strains contain amino acid substitutions within the antigenic regions of the VP4 proteins which could potentially impact the binding of rotavirus vaccine-induced antibodies. Altogether, our findings show that multiple strains with either Wa-like or DS-1-like genotype constellations have driven the re-emergence of G3 strains. The findings also highlight the role of human mobility and genome reassortment events in the cross-border dissemination and evolution of rotavirus strains in Malawi necessitating the need for long-term genomic surveillance of rotavirus in high disease-burden settings to inform disease prevention and control.
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Affiliation(s)
| | - Akuzike Banda
- Department of Computer Science, Faculty of Science, University of Malawi, Zomba 305205, Malawi
| | - End Chinyama
- Malawi-Liverpool-Wellcome Clinical Research Programme, Kamuzu University of Health Sciences, Blantyre 312225, Malawi
| | - Jonathan J Mandolo
- Malawi-Liverpool-Wellcome Clinical Research Programme, Kamuzu University of Health Sciences, Blantyre 312225, Malawi
- Department of Biomedical Sciences, School of Life Sciences and Allied Health Professions, Kamuzu University of Health Sciences, Blantyre 312225, Malawi
| | - Orpha Kumwenda
- Malawi-Liverpool-Wellcome Clinical Research Programme, Kamuzu University of Health Sciences, Blantyre 312225, Malawi
| | - Chikondi Malamba-Banda
- Malawi-Liverpool-Wellcome Clinical Research Programme, Kamuzu University of Health Sciences, Blantyre 312225, Malawi
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool L69 7BE, UK
- Department of Biological Sciences, Academy of Medical Sciences, Malawi University of Science and Technology, Thyolo 310105, Malawi
- Department of Medical Laboratory Sciences, Faculty of Biomedical Sciences and Health Profession, Kamuzu University of Health Sciences, Blantyre 312225, Malawi
| | - Kayla G Barnes
- Malawi-Liverpool-Wellcome Clinical Research Programme, Kamuzu University of Health Sciences, Blantyre 312225, Malawi
| | - Benjamin Kumwenda
- Department of Biomedical Sciences, School of Life Sciences and Allied Health Professions, Kamuzu University of Health Sciences, Blantyre 312225, Malawi
| | - Kondwani C Jambo
- Malawi-Liverpool-Wellcome Clinical Research Programme, Kamuzu University of Health Sciences, Blantyre 312225, Malawi
- Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool L3 5QA, UK
| | - Celeste M Donato
- Enteric Diseases Group, Murdoch Children’s Research Institute, 50 Flemington Road, Parkville, Melbourne 3052, Australia
- Department of Paediatrics, The University of Melbourne, Parkville, Victoria 3010, Australia
| | | | - Peter N Mwangi
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of Free State, Bloemfontein 9300, South Africa
| | - A Duncan Steele
- Diarrhoeal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa, Pretoria 0204, South Africa
| | - Miren Iturriza-Gomara
- Centre for Vaccine Innovation and Access, Program for Appropriate Technology in Health (PATH), Geneva 1218, Switzerland
| | - Nigel A Cunliffe
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool L69 7BE, UK
- NIHR Health Protection Research Unit in Gastrointestinal Infections, University of Liverpool, Liverpool L69 7BE, UK
| | - Valentine N Ndze
- Faculty of Health Sciences, University of Buea, PO Box 63, Buea, Cameroon
| | | | - Francis E Dennis
- Department of Electron Microscopy and Histopathology, Noguchi Memorial Institute for Medical Research, University of Ghana, Accra, P. O. Box LG 581, Legon, Ghana
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Mwangi PN, Potgieter RL, Uwimana J, Mutesa L, Muganga N, Murenzi D, Tusiyenge L, Mwenda JM, Mogotsi MT, Rakau K, Esona MD, Steele AD, Seheri ML, Nyaga MM. The Evolution of Post-Vaccine G8P[4] Group a Rotavirus Strains in Rwanda; Notable Variance at the Neutralization Epitope Sites. Pathogens 2023; 12:658. [PMID: 37242329 PMCID: PMC10223037 DOI: 10.3390/pathogens12050658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 04/24/2023] [Accepted: 04/26/2023] [Indexed: 05/28/2023] Open
Abstract
Africa has a high level of genetic diversity of rotavirus strains, which is suggested to be a possible reason contributing to the suboptimal effectiveness of rotavirus vaccines in this region. One strain that contributes to this rotavirus diversity in Africa is the G8P[4]. This study aimed to elucidate the entire genome and evolution of Rwandan G8P[4] strains. Illumina sequencing was performed for twenty-one Rwandan G8P[4] rotavirus strains. Twenty of the Rwandan G8P[4] strains had a pure DS-1-like genotype constellation, and one strain had a reassortant genotype constellation. Notable radical amino acid differences were observed at the neutralization sites when compared with cognate regions in vaccine strains potentially playing a role in neutralization escape. Phylogenetic analysis revealed that the closest relationship was with East African human group A rotavirus (RVA) strains for five of the genome segments. Two genome sequences of the NSP4 genome segment were closely related to bovine members of the DS-1-like family. Fourteen VP1 and eleven VP3 sequences had the closest relationships with the RotaTeq™ vaccine WC3 bovine genes. These findings suggest that the evolution of VP1 and VP3 might have resulted from reassortment events with RotaTeq™ vaccine WC3 bovine genes. The close phylogenetic relationship with East African G8P[4] strains from Kenya and Uganda suggests co-circulation in these countries. These findings highlight the need for continued whole-genomic surveillance to elucidate the evolution of G8P[4] strains, especially after the introduction of rotavirus vaccination.
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Affiliation(s)
- Peter N. Mwangi
- Next Generation Sequencing Unit, Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
| | - Robyn-Lee Potgieter
- Next Generation Sequencing Unit, Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
| | - Jeannine Uwimana
- Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda
| | - Leon Mutesa
- Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda
- Centre for Human Genetics, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda
| | - Narcisse Muganga
- Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda
| | - Didier Murenzi
- Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda
| | - Lisine Tusiyenge
- Kigali University Teaching Hospital, College of Medicine and Health Sciences, University of Rwanda, Kigali P.O. Box 4285, Rwanda
| | - Jason M. Mwenda
- World Health Organization, Regional Office for Africa, Brazzaville P.O. Box 06, Congo
| | - Milton T. Mogotsi
- Next Generation Sequencing Unit, Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
| | - Kebareng Rakau
- Diarrhoeal Pathogens Research Unit, Sefako Makgatho Health Sciences University (MEDUNSA), Pretoria 0204, South Africa
| | - Mathew D. Esona
- Diarrhoeal Pathogens Research Unit, Sefako Makgatho Health Sciences University (MEDUNSA), Pretoria 0204, South Africa
| | - A. Duncan Steele
- Diarrhoeal Pathogens Research Unit, Sefako Makgatho Health Sciences University (MEDUNSA), Pretoria 0204, South Africa
| | - Mapaseka L. Seheri
- Diarrhoeal Pathogens Research Unit, Sefako Makgatho Health Sciences University (MEDUNSA), Pretoria 0204, South Africa
| | - Martin M. Nyaga
- Next Generation Sequencing Unit, Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
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4
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Mwangi PN, Potgieter RL, Simwaka J, Mpabalwani EM, Mwenda JM, Mogotsi MT, Magagula N, Esona MD, Steele AD, Seheri ML, Nyaga MM. Genomic Analysis of G2P[4] Group A Rotaviruses in Zambia Reveals Positive Selection in Amino Acid Site 7 of Viral Protein 3. Viruses 2023; 15:v15020501. [PMID: 36851715 PMCID: PMC9965253 DOI: 10.3390/v15020501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/07/2023] [Accepted: 02/09/2023] [Indexed: 02/15/2023] Open
Abstract
The G2P[4] genotype is among the rotavirus strains that circulate commonly in humans. Several countries have reported its immediate upsurge after the introduction of rotavirus vaccination, raising concern about sub-optimal vaccine effectiveness against this genotype in the long term. This study aimed to gain insight into the evolution of post-vaccine Zambian G2P[4] group A rotavirus (RVA) strains and their overall genetic make-up by analysis of sequence alignments at the amino acid (AA) level. Twenty-nine Zambian G2P[4] rotavirus strains were subjected to whole-genome sequencing using the Illumina MiSeq® platform. All the strains exhibited the typical DS-1-like genotype constellation, and the nucleotide sequences of the 11 genome segments showed high nucleotide similarities (>97%). Phylogenetic analyses together with representative global G2P[4] RVA showed that Zambian strains clustered into human lineages IV (for VP2, VP4, VP7, NSP1, and NSP5), V (for VP1, VP3, VP6, NSP2, and NSP3), and XXIII (for NSP4). The AA differences between the lineages where the study strains clustered and lineages of global reference strains were identified and analyzed. Selection pressure analysis revealed that AA site seven in the Viral Protein 3 (VP3) genome segment was under positive selection. This site occurs in the region of intrinsic disorder in the VP3 protein, and Zambian G2P[4] strains could potentially be utilizing this intrinsically disordered region to survive immune pressure. The Zambian G2P[4] strains from 2012 to 2016 comprised the G2P[4] strains that have been circulating globally since the early 2000s, highlighting the epidemiological fitness of these contemporary G2P[4] strains. Continuous whole-genome surveillance of G2P[4] strains remains imperative to understand their evolution during the post-vaccination period.
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Affiliation(s)
- Peter N. Mwangi
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
| | - Robyn-Lee Potgieter
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
| | - Julia Simwaka
- Institute of Basic and Biomedical Sciences, Department of Biomedical Sciences, The Levy Mwanawasa Medical University, Lusaka 10101, Zambia
| | - Evans M. Mpabalwani
- Department of Paediatrics and Child Health, School of Medicine, University of Zambia, Ridgeway, Lusaka RW50000, Zambia
| | - Jason M. Mwenda
- World Health Organization, Regional Office for Africa, Brazzaville P.O. Box 06, Congo
| | - Milton T. Mogotsi
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
| | - Nonkululeko Magagula
- Diarrheal Pathogens Research Unit, Faculty of Health Sciences, Sefako Makgatho Health Sciences University, Pretoria 0204, South Africa
| | - Mathew D. Esona
- Diarrheal Pathogens Research Unit, Faculty of Health Sciences, Sefako Makgatho Health Sciences University, Pretoria 0204, South Africa
| | - A. Duncan Steele
- Diarrheal Pathogens Research Unit, Faculty of Health Sciences, Sefako Makgatho Health Sciences University, Pretoria 0204, South Africa
| | - Mapaseka L. Seheri
- Diarrheal Pathogens Research Unit, Faculty of Health Sciences, Sefako Makgatho Health Sciences University, Pretoria 0204, South Africa
| | - Martin M. Nyaga
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
- Correspondence:
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5
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Mwangi PN, Page NA, Seheri ML, Mphahlele MJ, Nadan S, Esona MD, Kumwenda B, Kamng'ona AW, Donato CM, Steele DA, Ndze VN, Dennis FE, Jere KC, Nyaga MM. Evolutionary changes between pre- and post-vaccine South African group A G2P[4] rotavirus strains, 2003-2017. Microb Genom 2022; 8. [PMID: 35446251 PMCID: PMC9453071 DOI: 10.1099/mgen.0.000809] [Citation(s) in RCA: 0] [Impact Index Per Article: 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] [Indexed: 11/18/2022] Open
Abstract
The transient upsurge of G2P[4] group A rotavirus (RVA) after Rotarix vaccine introduction in several countries has been a matter of concern. To gain insight into the diversity and evolution of G2P[4] strains in South Africa pre- and post-RVA vaccination introduction, whole-genome sequencing was performed for RVA positive faecal specimens collected between 2003 and 2017 and samples previously sequenced were obtained from GenBank (n=103; 56 pre- and 47 post-vaccine). Pre-vaccine G2 sequences predominantly clustered within sub-lineage IVa-1. In contrast, post-vaccine G2 sequences clustered mainly within sub-lineage IVa-3, whereby a radical amino acid (AA) substitution, S15F, was observed between the two sub-lineages. Pre-vaccine P[4] sequences predominantly segregated within sub-lineage IVa while post-vaccine sequences clustered mostly within sub-lineage IVb, with a radical AA substitution R162G. Both S15F and R162G occurred outside recognised antigenic sites. The AA residue at position 15 is found within the signal sequence domain of Viral Protein 7 (VP7) involved in translocation of VP7 into endoplasmic reticulum during infection process. The 162 AA residue lies within the hemagglutination domain of Viral Protein 4 (VP4) engaged in interaction with sialic acid-containing structure during attachment to the target cell. Free energy change analysis on VP7 indicated accumulation of stable point mutations in both antigenic and non-antigenic regions. The segregation of South African G2P[4] strains into pre- and post-vaccination sub-lineages is likely due to erstwhile hypothesized stepwise lineage/sub-lineage evolution of G2P[4] strains rather than RVA vaccine introduction. Our findings reinforce the need for continuous whole-genome RVA surveillance and investigation of contribution of AA substitutions in understanding the dynamic G2P[4] epidemiology.
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Affiliation(s)
- Peter N Mwangi
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
| | - Nicola A Page
- Centre for Enteric Disease, National Institute for Communicable Diseases, Private Bag X4, Sandringham, 2131, Johannesburg, South Africa.,Department of Medical Virology, Faculty of Health Sciences, University of Pretoria, Private Bag X323, Arcadia, 0007, Pretoria, South Africa
| | - Mapaseka L Seheri
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa 0204, Pretoria, South Africa
| | - M Jeffrey Mphahlele
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa 0204, Pretoria, South Africa.,Office of the Deputy Vice Chancellor for Research and Innovation, North-West University, Potchefstroom 2351, South Africa.,South African Medical Research Council, Pretoria 0001, South Africa
| | - Sandrama Nadan
- Centre for Enteric Disease, National Institute for Communicable Diseases, Private Bag X4, Sandringham, 2131, Johannesburg, South Africa
| | - Mathew D Esona
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa 0204, Pretoria, South Africa
| | - Benjamin Kumwenda
- Department of Biomedical Sciences, School of Life Sciences and Applied Health Professions, Kamuzu University of Health Sciences, Private Bag 360, Chichiri, Blantyre 3, Malawi
| | - Arox W Kamng'ona
- Department of Biomedical Sciences, School of Life Sciences and Applied Health Professions, Kamuzu University of Health Sciences, Private Bag 360, Chichiri, Blantyre 3, Malawi
| | - Celeste M Donato
- Department of Medical Laboratory Sciences, School of Life Sciences and Applied Health Professions, Kamuzu University of Health Sciences, Private Bag 360, Chichiri, Blantyre3, Malawi.,Enteric Diseases Group, Murdoch Children's Research Institute, 50 Flemington Road, Parkville, Melboune 3052, Australia.,Department of Paediatrics, the University of Melbourne, Parkville 3010, Australia
| | - Duncan A Steele
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa 0204, Pretoria, South Africa
| | - Valantine N Ndze
- Faculty of Health Sciences, University of Buea, P.O Box 63 Buea, Cameroon
| | - Francis E Dennis
- Department of Electron Microscopy and Histopathology, Noguchi Memorial Institute for Medical Research, University of Ghana, P.O Box LG581, Legon, Ghana
| | - Khuzwayo C Jere
- Center for Global Vaccine Research, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, L697BE, Liverpool, UK.,Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre 312225, Malawi
| | - Martin M Nyaga
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa
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6
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Viana R, Moyo S, Amoako DG, Tegally H, Scheepers C, Althaus CL, Anyaneji UJ, Bester PA, Boni MF, Chand M, Choga WT, Colquhoun R, Davids M, Deforche K, Doolabh D, du Plessis L, Engelbrecht S, Everatt J, Giandhari J, Giovanetti M, Hardie D, Hill V, Hsiao NY, Iranzadeh A, Ismail A, Joseph C, Joseph R, Koopile L, Kosakovsky Pond SL, Kraemer MUG, Kuate-Lere L, Laguda-Akingba O, Lesetedi-Mafoko O, Lessells RJ, Lockman S, Lucaci AG, Maharaj A, Mahlangu B, Maponga T, Mahlakwane K, Makatini Z, Marais G, Maruapula D, Masupu K, Matshaba M, Mayaphi S, Mbhele N, Mbulawa MB, Mendes A, Mlisana K, Mnguni A, Mohale T, Moir M, Moruisi K, Mosepele M, Motsatsi G, Motswaledi MS, Mphoyakgosi T, Msomi N, Mwangi PN, Naidoo Y, Ntuli N, Nyaga M, Olubayo L, Pillay S, Radibe B, Ramphal Y, Ramphal U, San JE, Scott L, Shapiro R, Singh L, Smith-Lawrence P, Stevens W, Strydom A, Subramoney K, Tebeila N, Tshiabuila D, Tsui J, van Wyk S, Weaver S, Wibmer CK, Wilkinson E, Wolter N, Zarebski AE, Zuze B, Goedhals D, Preiser W, Treurnicht F, Venter M, Williamson C, Pybus OG, Bhiman J, Glass A, Martin DP, Rambaut A, Gaseitsiwe S, von Gottberg A, de Oliveira T. Rapid epidemic expansion of the SARS-CoV-2 Omicron variant in southern Africa. Nature 2022; 603:679-686. [PMID: 35042229 PMCID: PMC8942855 DOI: 10.1038/s41586-022-04411-y] [Citation(s) in RCA: 918] [Impact Index Per Article: 459.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 01/07/2022] [Indexed: 01/02/2023]
Abstract
The SARS-CoV-2 epidemic in southern Africa has been characterized by three distinct waves. The first was associated with a mix of SARS-CoV-2 lineages, while the second and third waves were driven by the Beta (B.1.351) and Delta (B.1.617.2) variants, respectively1-3. In November 2021, genomic surveillance teams in South Africa and Botswana detected a new SARS-CoV-2 variant associated with a rapid resurgence of infections in Gauteng province, South Africa. Within three days of the first genome being uploaded, it was designated a variant of concern (Omicron, B.1.1.529) by the World Health Organization and, within three weeks, had been identified in 87 countries. The Omicron variant is exceptional for carrying over 30 mutations in the spike glycoprotein, which are predicted to influence antibody neutralization and spike function4. Here we describe the genomic profile and early transmission dynamics of Omicron, highlighting the rapid spread in regions with high levels of population immunity.
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Affiliation(s)
| | - Sikhulile Moyo
- Botswana Harvard AIDS Institute Partnership, Botswana Harvard HIV Reference Laboratory, Gaborone, Botswana
- Harvard T.H. Chan School of Public Health, Boston, MA, USA
- Botswana Presidential COVID-19 Taskforce, Gaborone, Botswana
| | - Daniel G Amoako
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | - Houriiyah Tegally
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Cathrine Scheepers
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
- South African Medical Research Council Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Christian L Althaus
- Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland
| | - Ugochukwu J Anyaneji
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Phillip A Bester
- Division of Virology, National Health Laboratory Service, Bloemfontein, South Africa
- Division of Virology, University of the Free State, Bloemfontein, South Africa
| | - Maciej F Boni
- Center for Infectious Disease Dynamics, Department of Biology, Pennsylvania State University, University Park, PA, USA
| | | | | | - Rachel Colquhoun
- Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, UK
| | - Michaela Davids
- Zoonotic Arbo and Respiratory Virus Program, Centre for Viral Zoonoses, Department of Medical Virology, University of Pretoria, Pretoria, South Africa
| | | | - Deelan Doolabh
- Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Louis du Plessis
- Department of Zoology, University of Oxford, Oxford, UK
- Department of Biosystems Science and Engineering, ETH Zurich, Zurich, Switzerland
| | - Susan Engelbrecht
- Division of Medical Virology, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, Cape Town, South Africa
| | - Josie Everatt
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | - Jennifer Giandhari
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Marta Giovanetti
- Laboratorio de Flavivirus, Fundacao Oswaldo Cruz, Rio de Janeiro, Brazil
- Laboratório de Genética Celular e Molecular, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Diana Hardie
- Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
- Division of Virology, NHLS Groote Schuur Laboratory, Cape Town, South Africa
| | - Verity Hill
- Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, UK
| | - Nei-Yuan Hsiao
- Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
- Division of Virology, NHLS Groote Schuur Laboratory, Cape Town, South Africa
- Wellcome Centre for Infectious Diseases Research in Africa (CIDRI-Africa), Cape Town, South Africa
| | - Arash Iranzadeh
- Division of Computational Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Arshad Ismail
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | | | - Rageema Joseph
- Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Legodile Koopile
- Botswana Harvard AIDS Institute Partnership, Botswana Harvard HIV Reference Laboratory, Gaborone, Botswana
| | - Sergei L Kosakovsky Pond
- Institute for Genomics and Evolutionary Medicine, Department of Biology, Temple University, Philadelphia, PA, USA
| | | | - Lesego Kuate-Lere
- Health Services Management, Ministry of Health and Wellness, Gaborone, Botswana
| | - Oluwakemi Laguda-Akingba
- NHLS Port Elizabeth Laboratory, Port Elizabeth, South Africa
- Faculty of Health Sciences, Walter Sisulu University, Mthatha, South Africa
| | - Onalethatha Lesetedi-Mafoko
- Public Health Department, Integrated Disease Surveillance and Response, Ministry of Health and Wellness, Gaborone, Botswana
| | - Richard J Lessells
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Shahin Lockman
- Botswana Harvard AIDS Institute Partnership, Botswana Harvard HIV Reference Laboratory, Gaborone, Botswana
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Alexander G Lucaci
- Institute for Genomics and Evolutionary Medicine, Department of Biology, Temple University, Philadelphia, PA, USA
| | - Arisha Maharaj
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Boitshoko Mahlangu
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | - Tongai Maponga
- Division of Medical Virology, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, Cape Town, South Africa
| | - Kamela Mahlakwane
- Division of Medical Virology, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, Cape Town, South Africa
- NHLS Tygerberg Laboratory, Tygerberg Hospital, Cape Town, South Africa
| | - Zinhle Makatini
- Department of Virology, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
| | - Gert Marais
- Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
- Division of Virology, NHLS Groote Schuur Laboratory, Cape Town, South Africa
| | - Dorcas Maruapula
- Botswana Harvard AIDS Institute Partnership, Botswana Harvard HIV Reference Laboratory, Gaborone, Botswana
| | - Kereng Masupu
- Botswana Presidential COVID-19 Taskforce, Gaborone, Botswana
| | - Mogomotsi Matshaba
- Botswana Presidential COVID-19 Taskforce, Gaborone, Botswana
- Botswana-Baylor Children's Clinical Centre of Excellence, Gaborone, Botswana
- Baylor College of Medicine, Houston, TX, USA
| | - Simnikiwe Mayaphi
- Department of Medical Virology, University of Pretoria, Pretoria, South Africa
| | - Nokuzola Mbhele
- Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Mpaphi B Mbulawa
- National Health Laboratory, Health Services Management, Ministry of Health and Wellness, Gaborone, Botswana
| | - Adriano Mendes
- Zoonotic Arbo and Respiratory Virus Program, Centre for Viral Zoonoses, Department of Medical Virology, University of Pretoria, Pretoria, South Africa
| | - Koleka Mlisana
- National Health Laboratory Service (NHLS), Johannesburg, South Africa
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Durban, South Africa
| | - Anele Mnguni
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | - Thabo Mohale
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | - Monika Moir
- Centre for Epidemic Response and Innovation (CERI), School of Data Science and Computational Thinking, Stellenbosch University, Stellenbosch, South Africa
| | - Kgomotso Moruisi
- Health Services Management, Ministry of Health and Wellness, Gaborone, Botswana
| | - Mosepele Mosepele
- Botswana Presidential COVID-19 Taskforce, Gaborone, Botswana
- Department of Medicine, Faculty of Medicine, University of Botswana, Gaborone, Botswana
| | - Gerald Motsatsi
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | - Modisa S Motswaledi
- Botswana Presidential COVID-19 Taskforce, Gaborone, Botswana
- Department of Medical Laboratory Sciences, School of Allied Health Professions, Faculty of Health Sciences, University of Botswana, Gaborone, Botswana
| | - Thongbotho Mphoyakgosi
- National Health Laboratory, Health Services Management, Ministry of Health and Wellness, Gaborone, Botswana
| | - Nokukhanya Msomi
- Discipline of Virology, School of Laboratory Medicine and Medical Sciences and National Health Laboratory Service (NHLS), University of KwaZulu-Natal, Durban, South Africa
| | - Peter N Mwangi
- Division of Virology, University of the Free State, Bloemfontein, South Africa
- Next Generation Sequencing Unit, Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
| | - Yeshnee Naidoo
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Noxolo Ntuli
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | - Martin Nyaga
- Division of Virology, University of the Free State, Bloemfontein, South Africa
- Next Generation Sequencing Unit, Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
| | - Lucier Olubayo
- Wellcome Centre for Infectious Diseases Research in Africa (CIDRI-Africa), Cape Town, South Africa
- Division of Computational Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Sureshnee Pillay
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Botshelo Radibe
- Botswana Harvard AIDS Institute Partnership, Botswana Harvard HIV Reference Laboratory, Gaborone, Botswana
| | - Yajna Ramphal
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Upasana Ramphal
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - James E San
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Lesley Scott
- Department of Molecular Medicine and Haematology, University of the Witwatersrand, Johannesburg, South Africa
| | - Roger Shapiro
- Botswana Harvard AIDS Institute Partnership, Botswana Harvard HIV Reference Laboratory, Gaborone, Botswana
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Lavanya Singh
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | | | - Wendy Stevens
- Department of Molecular Medicine and Haematology, University of the Witwatersrand, Johannesburg, South Africa
| | - Amy Strydom
- Zoonotic Arbo and Respiratory Virus Program, Centre for Viral Zoonoses, Department of Medical Virology, University of Pretoria, Pretoria, South Africa
| | - Kathleen Subramoney
- Department of Virology, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
| | - Naume Tebeila
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | - Derek Tshiabuila
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Joseph Tsui
- Department of Zoology, University of Oxford, Oxford, UK
| | - Stephanie van Wyk
- Centre for Epidemic Response and Innovation (CERI), School of Data Science and Computational Thinking, Stellenbosch University, Stellenbosch, South Africa
| | - Steven Weaver
- Institute for Genomics and Evolutionary Medicine, Department of Biology, Temple University, Philadelphia, PA, USA
| | - Constantinos K Wibmer
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
| | - Eduan Wilkinson
- Centre for Epidemic Response and Innovation (CERI), School of Data Science and Computational Thinking, Stellenbosch University, Stellenbosch, South Africa
| | - Nicole Wolter
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
- School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | | | - Boitumelo Zuze
- Botswana Harvard AIDS Institute Partnership, Botswana Harvard HIV Reference Laboratory, Gaborone, Botswana
| | - Dominique Goedhals
- Division of Virology, University of the Free State, Bloemfontein, South Africa
- PathCare Vermaak, Pretoria, South Africa
| | - Wolfgang Preiser
- Division of Medical Virology, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, Cape Town, South Africa
- NHLS Tygerberg Laboratory, Tygerberg Hospital, Cape Town, South Africa
| | - Florette Treurnicht
- Department of Virology, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
| | - Marietje Venter
- Zoonotic Arbo and Respiratory Virus Program, Centre for Viral Zoonoses, Department of Medical Virology, University of Pretoria, Pretoria, South Africa
| | - Carolyn Williamson
- Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
- Division of Virology, NHLS Groote Schuur Laboratory, Cape Town, South Africa
- Wellcome Centre for Infectious Diseases Research in Africa (CIDRI-Africa), Cape Town, South Africa
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | | | - Jinal Bhiman
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
- South African Medical Research Council Antibody Immunity Research Unit, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Allison Glass
- Lancet Laboratories, Johannesburg, South Africa
- Department of Molecular Pathology, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Darren P Martin
- Wellcome Centre for Infectious Diseases Research in Africa (CIDRI-Africa), Cape Town, South Africa
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Andrew Rambaut
- Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, UK
| | - Simani Gaseitsiwe
- Botswana Harvard AIDS Institute Partnership, Botswana Harvard HIV Reference Laboratory, Gaborone, Botswana
- Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Anne von Gottberg
- National Institute for Communicable Diseases (NICD) of the National Health Laboratory Service (NHLS), Johannesburg, South Africa
- School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Tulio de Oliveira
- KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa.
- Centre for Epidemic Response and Innovation (CERI), School of Data Science and Computational Thinking, Stellenbosch University, Stellenbosch, South Africa.
- Department of Global Health, University of Washington, Seattle, WA, USA.
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7
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Mwangi PN, Mogotsi MT, Seheri ML, Mphahlele MJ, Peenze I, Esona MD, Kumwenda B, Steele AD, Kirkwood CD, Ndze VN, Dennis FE, Jere KC, Nyaga MM. Whole Genome In-Silico Analysis of South African G1P[8] Rotavirus Strains Before and After Vaccine Introduction Over A Period of 14 Years. Vaccines (Basel) 2020; 8:E609. [PMID: 33066615 PMCID: PMC7712154 DOI: 10.3390/vaccines8040609] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 10/08/2020] [Accepted: 10/13/2020] [Indexed: 12/03/2022] Open
Abstract
Rotavirus G1P[8] strains account for more than half of the group A rotavirus (RVA) infections in children under five years of age, globally. A total of 103 stool samples previously characterized as G1P[8] and collected seven years before and seven years after introducing the Rotarix® vaccine in South Africa were processed for whole-genome sequencing. All the strains analyzed had a Wa-like constellation (G1-P[8]-I1-R1-C1-M1-A1-N1-T1-E1-H1). South African pre- and post-vaccine G1 strains were clustered in G1 lineage-I and II while the majority (84.2%) of the P[8] strains were grouped in P[8] lineage-III. Several amino acid sites across ten gene segments with the exception of VP7 were under positive selective pressure. Except for the N147D substitution in the antigenic site of eight post-vaccine G1 strains when compared to both Rotarix® and pre-vaccine strains, most of the amino acid substitutions in the antigenic regions of post-vaccine G1P[8] strains were already present during the pre-vaccine period. Therefore, Rotarix® did not appear to have an impact on the amino acid differences in the antigenic regions of South African post-vaccine G1P[8] strains. However, continued whole-genome surveillance of RVA strains to decipher genetic changes in the post-vaccine period remains imperative.
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Affiliation(s)
- Peter N. Mwangi
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa; (P.N.M.); (M.T.M.)
| | - Milton T. Mogotsi
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa; (P.N.M.); (M.T.M.)
| | - Mapaseka L. Seheri
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa 0204, South Africa; (M.L.S.); (M.J.M.); (I.P.); (M.D.E.)
| | - M. Jeffrey Mphahlele
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa 0204, South Africa; (M.L.S.); (M.J.M.); (I.P.); (M.D.E.)
- South African Medical Research Council, Pretoria 0001, South Africa
| | - Ina Peenze
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa 0204, South Africa; (M.L.S.); (M.J.M.); (I.P.); (M.D.E.)
| | - Mathew D. Esona
- Diarrheal Pathogens Research Unit, Sefako Makgatho Health Sciences University, Medunsa 0204, South Africa; (M.L.S.); (M.J.M.); (I.P.); (M.D.E.)
| | - Benjamin Kumwenda
- College of Medicine, Department of Biomedical Sciences, Faculty of Biomedical Sciences and Health Professions, University of Malawi, Private Bag 360, Chichiri, Blantyre 3, Malawi;
| | - A. Duncan Steele
- Enteric and Diarrheal Diseases, Global Health, Bill & Melinda Gates Foundation, P.O. Box 23350, Seattle, WA 98109, USA; (A.D.S.); (C.D.K.)
| | - Carl D. Kirkwood
- Enteric and Diarrheal Diseases, Global Health, Bill & Melinda Gates Foundation, P.O. Box 23350, Seattle, WA 98109, USA; (A.D.S.); (C.D.K.)
| | - Valantine N. Ndze
- Faculty of Health Sciences, University of Buea, P.O. Box 63, Buea, Cameroon;
| | - Francis E. Dennis
- Noguchi Memorial Institute for Medical Research, University of Ghana, P.O. Box LG581, Legon, Ghana;
| | - Khuzwayo C. Jere
- Center for Global Vaccine Research, Institute of Infection, Liverpool L697BE, UK;
- Veterinary and Ecological Sciences, University of Liverpool, Liverpool L697BE, UK
- Malawi-Liverpool-Wellcome Trust Clinical Research Program, Department of Medical Laboratory Sciences, College of Medicine, University of Malawi, Blantyre 312225, Malawi
| | - Martin M. Nyaga
- Next Generation Sequencing Unit and Division of Virology, Faculty of Health Sciences, University of the Free State, Bloemfontein 9300, South Africa; (P.N.M.); (M.T.M.)
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Sefeane TI, Mwangi PN. Incidence of Dupuytren's disease in Africans: A report of 48 new cases and a literature review. SA orthop j 2017. [DOI: 10.17159/2309-8309/2017/v16n2a6] [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: 11/05/2022] Open
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9
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Weigelt A, Marquard E, Temperton VM, Roscher C, Scherber C, Mwangi PN, Felten S, Buchmann N, Schmid B, Schulze ED, Weisser WW. The Jena Experiment: six years of data from a grassland biodiversity experiment. Ecology 2010. [DOI: 10.1890/09-0863.1] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Temperton VM, Mwangi PN, Scherer-Lorenzen M, Schmid B, Buchmann N. Positive interactions between nitrogen-fixing legumes and four different neighbouring species in a biodiversity experiment. Oecologia 2006; 151:190-205. [PMID: 17048010 DOI: 10.1007/s00442-006-0576-z] [Citation(s) in RCA: 214] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2005] [Accepted: 09/22/2006] [Indexed: 10/24/2022]
Abstract
The importance of facilitative processes due to the presence of nitrogen-fixing legumes in temperate grasslands is a contentious issue in biodiversity experiments. Despite a multitude of studies of fertilization effects of legumes on associated nonfixers in agricultural systems, we know little about the dynamics in more diverse systems. We hypothesised that the identity of target plant species (phytometers) and the diversity of neighbouring plant species would affect the magnitude of such positive species interactions. We therefore sampled aboveground tissues of phytometers planted into all plots of a grassland biodiversity-ecosystem functioning experiment and analysed their N concentrations, delta15N values and biomasses. The four phytometer species (Festuca pratensis, Plantago lanceolata, Knautia arvensis and Trifolium pratensis) each belonged to one of the four plant functional groups used in the experiment and allowed the effects of diversity on N dynamics in individual species to be assessed. We found significantly lower delta15N values and higher N concentrations and N contents (amount of N per plant) in phytometer species growing with legumes, indicating a facilitative role for legumes in these grassland ecosystems. Our data suggest that the main driving force behind these facilitative interactions in plots containing legumes was reduced competition for soil nitrate ("nitrate sparing"), with apparent N transfer playing a secondary role. Interestingly, species richness (and to a lesser extent functional group number) significantly decreased delta15N values, N concentrations and N content irrespective of any legume effect. Possible mechanisms behind this effect, such as increased N mineralisation and nitrate uptake in more diverse plots, now need further investigation. The magnitude of the positive interactions depended on the identity of the phytometer species. Evidence for increased N uptake in communities containing legumes was found in all three nonlegume phytometer species, with a subsequent strong increase in biomass in the grass F. pratensis across all diversity levels, and a lesser biomass gain in P. lanceolata and K. arvensis. In contrast, the legume phytometer species T. pratense was negatively affected when other legumes were present in their host communities across all diversity levels.
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Affiliation(s)
- Vicky M Temperton
- Max Planck Institute for Biogeochemistry, Hans-Knöll Strasse 10, 07745, Jena, Germany.
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11
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Scherber C, Mwangi PN, Temperton VM, Roscher C, Schumacher J, Schmid B, Weisser WW. Effects of plant diversity on invertebrate herbivory in experimental grassland. Oecologia 2005; 147:489-500. [PMID: 16231192 DOI: 10.1007/s00442-005-0281-3] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2004] [Accepted: 09/14/2005] [Indexed: 10/25/2022]
Abstract
The rate at which a plant species is attacked by invertebrate herbivores has been hypothesized to depend on plant species richness, yet empirical evidence is scarce. Current theory predicts higher herbivore damage in monocultures than in species-rich mixtures. We quantified herbivore damage by insects and molluscs to plants in experimental plots established in 2002 from a species pool of 60 species of Central European Arrhenatherum grasslands. Plots differed in plant species richness (1, 2, 4, 8, 16, 60 species), number of functional groups (1, 2, 3, 4), functional group and species composition. We estimated herbivore damage by insects and molluscs at the level of transplanted plant individuals ("phytometer" species Plantago lanceolata, Trifolium pratense, Rumex acetosa) and of the entire plant community during 2003 and 2004. In contrast to previous studies, our design allows specific predictions about the relative contributions of functional diversity, plant functional identity, and species richness in relation to herbivory. Additionally, the phytometer approach is new to biodiversity-herbivory studies, allowing estimates of species-specific herbivory rates within the larger biodiversity-ecosystem functioning context. Herbivory in phytometers and experimental communities tended to increase with plant species richness and the number of plant functional groups, but the effects were rarely significant. Herbivory in phytometers was in some cases positively correlated with community biomass or leaf area index. The most important factor influencing invertebrate herbivory was the presence of particular plant functional groups. Legume (grass) presence strongly increased (decreased) herbivory at the community level. The opposite pattern was found for herbivory in T. pratense phytometers. We conclude that (1) plant species richness is much less important than previously thought and (2) plant functional identity is a much better predictor of invertebrate herbivory in temperate grassland ecosystems.
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Affiliation(s)
- Christoph Scherber
- Institute of Ecology, University of Jena, Dornburger Str. 159, 07743, Jena, Germany.
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