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Ribeiro DM, Salama AAK, Vitor ACM, Argüello A, Moncau CT, Santos EM, Caja G, de Oliveira JS, Balieiro JCC, Hernández-Castellano LE, Zachut M, Poleti MD, Castro N, Alves SP, Almeida AM. The application of omics in ruminant production: a review in the tropical and sub-tropical animal production context. J Proteomics 2020; 227:103905. [PMID: 32712373 DOI: 10.1016/j.jprot.2020.103905] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 06/25/2020] [Accepted: 07/16/2020] [Indexed: 02/08/2023]
Abstract
The demand for animal products (e.g. dairy and beef) in tropical regions is expected to increase in parallel with the public demand for sustainable practices, due to factors such as population growth and climate change. The necessity to increase animal production output must be achieved with better management and production technologies. For this to happen, novel research methodologies, animal selection and postgenomic tools play a pivotal role. Indeed, improving breeder selection programs, the quality of meat and dairy products as well as animal health will contribute to higher sustainability and productivity. This would surely benefit regions where resource quality and quantity are increasingly unstable, and research is still very incipient, which is the case of many regions in the tropics. The purpose of this review is to demonstrate how omics-based approaches play a major role in animal science, particularly concerning ruminant production systems and research associated to the tropics and developing countries. SIGNIFICANCE: Environmental conditions in the tropics make livestock production harder, compared to temperate regions. Due to global warming, the sustainability of livestock production will become increasingly problematic. The use of novel omics technologies could generate useful information to understand adaptation mechanisms of resilient breeds and/or species. The application of omics to tropical animal production is still residual in the currently available literature. With this review, we aim to summarize the most notable results in the field whilst encouraging further research to deal with the future challenges that animal production in the tropics will need to face.
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Affiliation(s)
- David M Ribeiro
- LEAF Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, University of Lisbon, Lisboa, Portugal
| | - Ahmed A K Salama
- Group of Research in Ruminants (G2R), Department of Animal and Food Science, Universitat Autònoma de Barcelona (UAB), Bellaterra, Barcelona, Spain
| | - Ana C M Vitor
- CIISA - Centro de Investigação Interdisciplinar em Sanidade Animal, Faculdade de Medicina Veterinária, Universidade de Lisboa, Av. da Universidade Técnica, Lisboa, Portugal
| | - Anastasio Argüello
- Animal Production and Biotechnology group, Institute of Animal Health and Food Safety, Universidad de Las Palmas de Gran Canaria, 35413 Arucas, Spain
| | - Cristina T Moncau
- FZEA - Faculty of Animal Science and Food Engineering, University of São Paulo, Avenida Duque de Caxias Norte - 225, 13635-900 Pirassununga, SP, Brazil
| | - Edson M Santos
- Departamento de Zootecnia, Centro de Ciências Agrárias, Universidade Federal da Paraíba, Areia, PB, Brazil
| | - Gerardo Caja
- Group of Research in Ruminants (G2R), Department of Animal and Food Science, Universitat Autònoma de Barcelona (UAB), Bellaterra, Barcelona, Spain
| | - Juliana S de Oliveira
- Departamento de Zootecnia, Centro de Ciências Agrárias, Universidade Federal da Paraíba, Areia, PB, Brazil
| | - Júlio C C Balieiro
- FMVZ - School of Veterinary Medicine and Animal Science, University of São Paulo, Avenida Duque de Caxias Norte - 225, 13635-900 Pirassununga, SP, Brazil
| | | | - Maya Zachut
- Department of Ruminant Science, Institute of Animal Sciences Agricultural Research Organization/Volcani Center, Rishon Lezion 7505101, Israel
| | - Mirele D Poleti
- FZEA - Faculty of Animal Science and Food Engineering, University of São Paulo, Avenida Duque de Caxias Norte - 225, 13635-900 Pirassununga, SP, Brazil
| | - Noemi Castro
- Animal Production and Biotechnology group, Institute of Animal Health and Food Safety, Universidad de Las Palmas de Gran Canaria, 35413 Arucas, Spain
| | - Susana P Alves
- CIISA - Centro de Investigação Interdisciplinar em Sanidade Animal, Faculdade de Medicina Veterinária, Universidade de Lisboa, Av. da Universidade Técnica, Lisboa, Portugal
| | - André M Almeida
- LEAF Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, University of Lisbon, Lisboa, Portugal.
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Luo K, Wu F, Zhang D, Dong R, Fan Z, Zhang R, Yan Z, Wang Y, Zhang J. Transcriptomic profiling of Melilotus albus near-isogenic lines contrasting for coumarin content. Sci Rep 2017; 7:4577. [PMID: 28676637 PMCID: PMC5496894 DOI: 10.1038/s41598-017-04111-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 05/09/2017] [Indexed: 12/30/2022] Open
Abstract
Coumarin and its derivatives are widely used as fragrances in industrial products and have medical value. The goal of the present study was to discover genes and pathways related to coumarin biosynthesis in Melilotus albus using transcriptome analysis. The genes of five M. albus near-isogenic lines (NILs) that had different coumarin content and β-glucosidase activity according to the investigation of pedigree were quantified and then analysed by RNA-Seq. Using transcriptome analysis, differentially expressed genes (DEGs) were identified in two pairwise comparisons that differed in coumarin content as well as in two pairwise comparisons that differed in β-glucosidase activity. Gene expression pattern analysis suggested similar transcriptional trends in the genotypes with the same coumarin levels. Furthermore, the Kyoto Encyclopedia of Genes and Genomes (KEGG) database of DEGs was used to identify functional pathways associated with coumarin biosynthesis. We identified 111 unigenes, with several DEGs among them possibly being related to coumarin synthesis pathways. Unigenes encoding a hexokinase, an abscisic acid receptor, a phenylalanine ammonia-lyase (PAL) and two peroxidases particularly showed correspondence with the coumarin content of different genotypes. These results will contribute to a better understanding of the coumarin biosynthesis in M. albus.
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Affiliation(s)
- Kai Luo
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China
| | - Fan Wu
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China
| | - Daiyu Zhang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China
| | - Rui Dong
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China
| | - Zhichao Fan
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China
| | - Rui Zhang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China
| | - Zhuanzhuan Yan
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China
| | - Yanrong Wang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China.
| | - Jiyu Zhang
- State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China.
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Metabolic shift in the emergence of hyperinvasive pandemic meningococcal lineages. Sci Rep 2017; 7:41126. [PMID: 28112239 PMCID: PMC5282872 DOI: 10.1038/srep41126] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 12/15/2016] [Indexed: 12/15/2022] Open
Abstract
Hyperinvasive lineages of Neisseria meningitidis, which persist despite extensive horizontal genetic exchange, are a major cause of meningitis and septicaemia worldwide. Over the past 50 years one such lineage of meningococci, known as serogroup A, clonal complex 5 (A:cc5), has caused three successive pandemics, including epidemics in sub-Saharan Africa. Although the principal antigens that invoke effective immunity have remained unchanged, distinct A:cc5 epidemic clones have nevertheless emerged. An analysis of whole genome sequence diversity among 153 A:cc5 isolates identified eleven genetic introgression events in the emergence of the epidemic clones, which primarily involved variants of core genes encoding metabolic processes. The acquired DNA was identical to that found over many years in other, unrelated, hyperinvasive meningococci, suggesting that the epidemic clones emerged by acquisition of pre-existing metabolic gene variants, rather than ‘virulence’ associated or antigen-encoding genes. This is consistent with mathematical models which predict the association of transmission fitness with the emergence and maintenance of virulence in recombining commensal organisms.
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Webster GR, Teh AYH, Ma JKC. Synthetic gene design-The rationale for codon optimization and implications for molecular pharming in plants. Biotechnol Bioeng 2016; 114:492-502. [PMID: 27618314 DOI: 10.1002/bit.26183] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 08/10/2016] [Accepted: 09/05/2016] [Indexed: 12/14/2022]
Abstract
Degeneracy in the genetic code allows multiple codon sequences to encode the same protein. Codon usage bias in genes is the term given to the preferred use of particular synonymous codons. Synonymous codon substitutions had been regarded as "silent" as the primary structure of the protein was not affected; however, it is now accepted that synonymous substitutions can have a significant effect on heterologous protein expression. Codon optimization, the process of altering codons within the gene sequence to improve recombinant protein expression, has become widely practised. Multiple inter-linked factors affecting protein expression need to be taken into consideration when optimizing a gene sequence. Over the years, various computer programmes have been developed to aid in the gene sequence optimization process. However, as the rulebook for altering codon usage to affect protein expression is still not completely understood, it is difficult to predict which strategy, if any, will design the "optimal" gene sequence. In this review, codon usage bias and factors affecting codon selection will be discussed and the evidence for codon optimization impact will be reviewed for recombinant protein expression using plants as a case study. These developments will be relevant to all recombinant expression systems; however, molecular pharming in plants is an area which has consistently encountered difficulties with low levels of recombinant protein expression, and should benefit from an evidence based rational approach to synthetic gene design. Biotechnol. Bioeng. 2017;114: 492-502. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Gina R Webster
- Molecular Immunology Unit, Institute for Infection and Immunity, St. George's University of London, SW17 0RE, London, UK
| | - Audrey Y-H Teh
- Molecular Immunology Unit, Institute for Infection and Immunity, St. George's University of London, SW17 0RE, London, UK
| | - Julian K-C Ma
- Molecular Immunology Unit, Institute for Infection and Immunity, St. George's University of London, SW17 0RE, London, UK
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Reduced Infectivity in cattle for an outer membrane protein mutant of Anaplasma marginale. Appl Environ Microbiol 2015; 81:2206-14. [PMID: 25595772 DOI: 10.1128/aem.03241-14] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Anaplasma marginale is the causative agent of anaplasmosis in cattle. Transposon mutagenesis of this pathogen using the Himar1 system resulted in the isolation of an omp10 operon insertional mutant referred to as the omp10::himar1 mutant. The work presented here evaluated if this mutant had morphological and/or growth rate defects compared to wild-type A. marginale. Results showed that the morphology, developmental cycle, and growth in tick and mammalian cell cultures are similar for the mutant and the wild type. Tick transmission experiments established that tick infection levels with the mutant were similar to those with wild-type A. marginale and that infected ticks successfully infected cattle. However, this mutant exhibited reduced infectivity and growth in cattle. The possibility of transforming A. marginale by transposon mutagenesis coupled with in vitro and in vivo assessment of altered phenotypes can aid in the identification of genes associated with virulence. The isolation of deliberately attenuated organisms that can be evaluated in their natural biological system is an important advance for the rational design of vaccines against this species.
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Proteomics informed by transcriptomics identifies novel secreted proteins in Dermacentor andersoni saliva. Int J Parasitol 2014; 44:1029-37. [DOI: 10.1016/j.ijpara.2014.07.003] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 07/13/2014] [Accepted: 07/14/2014] [Indexed: 12/19/2022]
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Immunization-induced Anaplasma marginale-specific T-lymphocyte responses impaired by A. marginale infection are restored after eliminating infection with tetracycline. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2014; 21:1369-75. [PMID: 25008904 DOI: 10.1128/cvi.00246-14] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Infection of cattle with Anaplasma marginale fails to prime sustained effector/memory T-cell responses, and high bacterial load may induce antigen-specific CD4 T exhaustion and deletion. We tested the hypothesis that clearance of persistent infection restores the exhausted T-cell response. We show that infection-induced T-cell exhaustion, characterized as loss of antigen-specific proliferation, and gamma interferon (IFN-γ) and tumor necrosis factor alpha (TNF-α) production are partially restored in cattle following clearance of persistent infection with tetracycline.
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Pruneau L, Moumène A, Meyer DF, Marcelino I, Lefrançois T, Vachiéry N. Understanding Anaplasmataceae pathogenesis using "Omics" approaches. Front Cell Infect Microbiol 2014; 4:86. [PMID: 25072029 PMCID: PMC4078744 DOI: 10.3389/fcimb.2014.00086] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Accepted: 06/10/2014] [Indexed: 11/13/2022] Open
Abstract
This paper examines how "Omics" approaches improve our understanding of Anaplasmataceae pathogenesis, through a global and integrative strategy to identify genes and proteins involved in biochemical pathways key for pathogen-host-vector interactions. The Anaplasmataceae family comprises obligate intracellular bacteria mainly transmitted by arthropods. These bacteria are responsible for major human and animal endemic and emerging infectious diseases with important economic and public health impacts. In order to improve disease control strategies, it is essential to better understand their pathogenesis. Our work focused on four Anaplasmataceae, which cause important animal, human and zoonotic diseases: Anaplasma marginale, A. phagocytophilum, Ehrlichia chaffeensis, and E. ruminantium. Wolbachia spp. an endosymbiont of arthropods was also included in this review as a model of a non-pathogenic Anaplasmataceae. A gap analysis on "Omics" approaches on Anaplasmataceae was performed, which highlighted a lack of studies on the genes and proteins involved in the infection of hosts and vectors. Furthermore, most of the studies have been done on the pathogen itself, mainly on infectious free-living forms and rarely on intracellular forms. In order to perform a transcriptomic analysis of the intracellular stage of development, researchers developed methods to enrich bacterial transcripts from infected cells. These methods are described in this paper. Bacterial genes encoding outer membrane proteins, post-translational modifications, eukaryotic repeated motif proteins, proteins involved in osmotic and oxidative stress and hypothetical proteins have been identified to play a key role in Anaplasmataceae pathogenesis. Further investigations on the function of these outer membrane proteins and hypothetical proteins will be essential to confirm their role in the pathogenesis. Our work underlines the need for further studies in this domain and on host and vector responses to infection.
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Affiliation(s)
- Ludovic Pruneau
- CIRAD, BIOS, UMR CMAEE Petit-Bourg, France ; INRA, BIOS, UMR CMAEE Montpellier, France ; Université des Antilles et de la Guyane Pointe-à-Pitre, France
| | - Amal Moumène
- CIRAD, BIOS, UMR CMAEE Petit-Bourg, France ; INRA, BIOS, UMR CMAEE Montpellier, France ; Université des Antilles et de la Guyane Pointe-à-Pitre, France
| | - Damien F Meyer
- CIRAD, BIOS, UMR CMAEE Petit-Bourg, France ; INRA, BIOS, UMR CMAEE Montpellier, France
| | - Isabel Marcelino
- CIRAD, BIOS, UMR CMAEE Petit-Bourg, France ; INRA, BIOS, UMR CMAEE Montpellier, France ; IBET Apartado, Oeiras, Portugal ; ITQB-UNL, Estação Agronómica Nacional Oeiras, Lisboa, Portugal
| | - Thierry Lefrançois
- CIRAD, BIOS, UMR CMAEE Petit-Bourg, France ; INRA, BIOS, UMR CMAEE Montpellier, France
| | - Nathalie Vachiéry
- CIRAD, BIOS, UMR CMAEE Petit-Bourg, France ; INRA, BIOS, UMR CMAEE Montpellier, France
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Hammac GK, Pierlé SA, Cheng X, Scoles GA, Brayton KA. Global transcriptional analysis reveals surface remodeling of Anaplasma marginale in the tick vector. Parasit Vectors 2014; 7:193. [PMID: 24751137 PMCID: PMC4022386 DOI: 10.1186/1756-3305-7-193] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 04/08/2014] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Pathogens dependent upon vectors for transmission to new hosts undergo environment specific changes in gene transcription dependent on whether they are replicating in the vector or the mammalian host. Differential gene transcription, especially of potential vaccine candidates, is of interest in Anaplasma marginale, the tick-borne causative agent of bovine anaplasmosis. METHODS RNA-seq technology allowed a comprehensive analysis of the transcriptional status of A. marginale genes in two conditions: bovine host blood and tick derived cell culture, a model for the tick vector. Quantitative PCR was used to assess transcription of a set of genes in A. marginale infected tick midguts and salivary glands at two time points during the transmission cycle. RESULTS Genes belonging to fourteen pathways or component groups were found to be differentially transcribed in A. marginale in the bovine host versus the tick vector. One of the most significantly altered groups was composed of surface proteins. Of the 56 genes included in the surface protein group, eight were up regulated and 26 were down regulated. The down regulated surface protein encoding genes include several that are well studied due to their immunogenicity and function. Quantitative PCR of a set of genes demonstrated that transcription in tick cell culture most closely approximates transcription in salivary glands of recently infected ticks. CONCLUSIONS The ISE6 tick cell culture line is an acceptable model for early infection in tick salivary glands, and reveals disproportionate down regulation of surface protein genes in the tick. Transcriptional profiling in other cell lines may help us simulate additional microenvironments. Understanding vector-specific alteration of gene transcription, especially of surface protein encoding genes, may aid in the development of vaccines or transmission blocking therapies.
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Affiliation(s)
| | | | | | | | - Kelly A Brayton
- Program in Genomics, Department of Veterinary Microbiology and Pathology, Paul G, Allen School for Global Animal Health, Washington State University, Pullman, WA 99164-7040, USA.
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Wood DO, Wood RR, Tucker AM. Genetic systems for studying obligate intracellular pathogens: an update. Curr Opin Microbiol 2013; 17:11-6. [PMID: 24581687 DOI: 10.1016/j.mib.2013.10.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 10/23/2013] [Accepted: 10/29/2013] [Indexed: 11/18/2022]
Abstract
Rapid advancements in the genetic manipulation of obligate intracellular bacterial pathogens have been made over the past two years. In this paper we attempt to summarize the work published since 2011 that documents these exciting accomplishments. Although each genus comprising this diverse group of pathogens poses unique problems, requiring modifications of established techniques and the introduction of new tools, all appear amenable to genetic analysis. Significantly, the field is moving forward from a focus on the identification and development of genetic techniques to their application in addressing crucial questions related to mechanisms of bacterial pathogenicity and the requirements of obligate intracellular growth.
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Affiliation(s)
- David O Wood
- Laboratory of Molecular Biology, Department of Microbiology and Immunology, College of Medicine, University of South Alabama, 501 Aubrey Green Drive, Mobile, AL 36688-0002, United States.
| | - Raphael R Wood
- Laboratory of Molecular Biology, Department of Microbiology and Immunology, College of Medicine, University of South Alabama, 501 Aubrey Green Drive, Mobile, AL 36688-0002, United States
| | - Aimee M Tucker
- Laboratory of Molecular Biology, Department of Microbiology and Immunology, College of Medicine, University of South Alabama, 501 Aubrey Green Drive, Mobile, AL 36688-0002, United States
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Truchan HK, Seidman D, Carlyon JA. Breaking in and grabbing a meal: Anaplasma phagocytophilum cellular invasion, nutrient acquisition, and promising tools for their study. Microbes Infect 2013; 15:1017-25. [PMID: 24141091 PMCID: PMC3894830 DOI: 10.1016/j.micinf.2013.10.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Accepted: 10/10/2013] [Indexed: 12/19/2022]
Abstract
Anaplasma phagocytophilum invades neutrophils to cause the emerging infection, human granulocytic anaplasmosis. Here, we provide a focused review of the A. phagocytophilum invasin-host cell receptor interactions that promote bacterial entry and the degradative and membrane traffic pathways that the organism exploits to route nutrients to the organelle in which it resides. Because its obligatory intracellular nature hinders knock out-complementation approaches, we also discuss the current methods used to study A. phagocytophilum gene function and the potential benefit of applying novel tools that have advanced studies of other obligate intracellular bacterial pathogens.
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Affiliation(s)
- Hilary K. Truchan
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, Virginia
| | - David Seidman
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, Virginia
| | - Jason A. Carlyon
- Department of Microbiology and Immunology, Virginia Commonwealth University School of Medicine, Richmond, Virginia
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Hammac GK, Ku PS, Galletti MF, Noh SM, Scoles GA, Palmer GH, Brayton KA. Protective immunity induced by immunization with a live, cultured Anaplasma marginale strain. Vaccine 2013; 31:3617-22. [PMID: 23664994 PMCID: PMC3903126 DOI: 10.1016/j.vaccine.2013.04.069] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 04/02/2013] [Accepted: 04/24/2013] [Indexed: 11/15/2022]
Abstract
Despite significant economic losses resulting from infection with Anaplasma marginale, a tick-transmitted rickettsial pathogen of cattle, available vaccines provide, at best, only partial protection against clinical disease. The green-fluorescent protein expressing mutant of the A. marginale St. Maries strain is a live, marked vaccine candidate (AmStM-GFP). To test whether AmStM-GFP is safe and provides clinical protection, a group of calves was vaccinated, and clinical parameters, including percent parasitized erythrocytes (PPE), packed cell volume (PCV) and days required to reach peak bacteremia, were measured following inoculation and following tick challenge with wild type St. Maries strain (AmStM). These clinical parameters were compared to those obtained during infection with the A. marginale subsp. centrale vaccine strain (A. centrale) or wild type AmStM. AmStM-GFP resulted in similar clinical parameters to A. centrale, but had a lower maximum PPE, smaller drop in PCV and took longer to reach peak bacteremia than wild type AmStM. AmStM-GFP provided clinical protection, yielding a stable PCV and low bacteremia following challenge, whereas A. centrale only afforded partial clinical protection.
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Affiliation(s)
- G. Kenitra Hammac
- Program in Genomics, Department of Veterinary Microbiology and Pathology, Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA 99164-7040
| | - Pei-Shin Ku
- Program in Genomics, Department of Veterinary Microbiology and Pathology, Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA 99164-7040
| | - Maria F. Galletti
- Program in Genomics, Department of Veterinary Microbiology and Pathology, Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA 99164-7040
| | - Susan M. Noh
- Animal Disease Research Unit, U.S. Department of Agriculture, Agricultural Research Service, PO Box 646630, Pullman, WA 99164-6630
| | - Glen A. Scoles
- Animal Disease Research Unit, U.S. Department of Agriculture, Agricultural Research Service, PO Box 646630, Pullman, WA 99164-6630
| | - Guy H. Palmer
- Program in Genomics, Department of Veterinary Microbiology and Pathology, Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA 99164-7040
| | - Kelly A. Brayton
- Program in Genomics, Department of Veterinary Microbiology and Pathology, Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA 99164-7040
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