51
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Carrasco P, Inostroza C, Didier M, Godoy M, Holt CL, Tabak J, Loftus A. Optimizing DNA recovery and forensic typing of degraded blood and dental remains using a specialized extraction method, comprehensive qPCR sample characterization, and massively parallel sequencing. Int J Legal Med 2019; 134:79-91. [PMID: 31414202 PMCID: PMC6949324 DOI: 10.1007/s00414-019-02124-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 07/10/2019] [Indexed: 12/30/2022]
Abstract
Human dental remains encountered in criminal casework evidence, missing person cases, or mass disaster tragedies provide a valuable sample source for DNA typing when suitable soft tissue is unavailable. Using traditional methods, teeth samples can be challenging to process, resulting in low-quantity and/or quality nuclear DNA and insufficient profiles for comparisons. This study examines the performance of a three-part nuclear DNA analysis workflow for teeth samples based on (1) improved dental tissue recovery using the Dental Forensic Kit (DFKMR) (Universidad de los Andes) and DNA extraction with QuickExtract™ FFPE DNA Extraction Kit (Lucigen®), (2) quantification with InnoQuant® HY (InnoGenomics Technologies) for sensitive assessment of total human and male DNA quantity/quality, and (3) massively parallel sequencing for simultaneous genotyping of 231 short tandem repeat (STR) and single-nucleotide polymorphism (SNP) markers with the ForenSeq® DNA Signature Prep Kit (Verogen, Inc.). Initial evaluation of artificially degraded blood samples (n = 10) achieved highly sensitive and informative quantification results with InnoQuant® HY, enabling successful first pass genotyping with the MiSeq FGx® System. Twenty-three STR alleles (out of 85) and 70 identity informative SNP loci (out of 94) were recovered from two pg total long target DNA input (0.86 ng total short target input) and an InnoQuant degradation index (DI) of 460 (severely degraded). The three-part workflow was subsequently applied to teeth samples (dental pulp, root cement tissues; n = 13) with postmortem intervals (PMI) of the teeth ranging from 8 days to approximately 6 months. Informative SNP and STR DNA profiles were obtained, to include 78 STR alleles and 85 identity informative SNP loci typed (of 94 total SNP targets) in a 1 month, four-day PMI root cement sample with one pg total long target DNA input and a DI of 76. These data indicate successful performance of the proposed workflow from degraded DNA from teeth samples.
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Affiliation(s)
- Patricio Carrasco
- Universidad de los Andes, Mons. Álvaro del Portillo 12.455, Las Condes, Santiago Chile
| | - Carolina Inostroza
- Universidad de los Andes, Mons. Álvaro del Portillo 12.455, Las Condes, Santiago Chile
| | - Meghan Didier
- Verogen, Inc., 11111 Flintkote Avenue, San Diego, CA 92121 USA
| | - Marianela Godoy
- Universidad de los Andes, Mons. Álvaro del Portillo 12.455, Las Condes, Santiago Chile
| | - Cydne L. Holt
- Verogen, Inc., 11111 Flintkote Avenue, San Diego, CA 92121 USA
| | - Jonathan Tabak
- Verogen, Inc., 11111 Flintkote Avenue, San Diego, CA 92121 USA
| | - Andrew Loftus
- InnoGenomics Technologies, LLC, 1441 Canal Street, New Orleans, LA 70112 USA
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Abstract
PURPOSE OF REVIEW This article reviews the spectrum of neurologic disease associated with human herpesvirus infections. RECENT FINDINGS As more patients are becoming therapeutically immunosuppressed, human herpesvirus infections are increasingly common. Historically, infections with human herpesviruses were described as temporal lobe encephalitis caused by herpes simplex virus type 1 or type 2. More recently, however, additional pathogens, such as varicella-zoster virus, Epstein-Barr virus, cytomegalovirus, and human herpesvirus 6 have been identified to cause serious neurologic infections. As literature emerges, clinical presentations of herpesvirus infections have taken on many new forms, becoming heterogeneous and involving nearly every location along the neuraxis. Advanced diagnostic methods are now available for each specific pathogen in the herpesvirus family. As data emerge on viral resistance to conventional therapies, newer antiviral medications must be considered. SUMMARY Infections from the herpesvirus family can have devastating neurologic outcomes without prompt and appropriate treatment. Clinical recognition of symptoms and appropriate advanced testing are necessary to correctly identify the infectious etiology. Knowledge of secondary neurologic complications of disease is equally important to prevent additional morbidity and mortality. This article discusses infections of the central and peripheral nervous systems caused by herpes simplex virus type 1 and type 2, varicella-zoster virus, Epstein-Barr virus, cytomegalovirus, and human herpesvirus 6. The pathophysiology, epidemiology, clinical presentations of disease, diagnostic investigations, imaging characteristics, and treatment for each infectious etiology are discussed in detail.
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Chien YS, Luo ST, Tsao KC, Huang YC, Chung WY, Liao YC, Tan Y, Das SR, Lee MS. Genomic analysis of serologically untypable human enteroviruses in Taiwan. J Biomed Sci 2019; 26:49. [PMID: 31266491 PMCID: PMC6607526 DOI: 10.1186/s12929-019-0541-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 06/11/2019] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Human enteroviruses contain over 100 serotypes. We have routinely conducted enterovirus surveillance in northern Taiwan; but about 10% of isolates could not be serotyped using traditional assays. Next-generation sequencing (NGS) is a powerful tool for genome sequencing. METHODS In this study, we established an NGS platform to conduct genome sequencing for the serologically untypable enterovirus isolates. RESULTS Among 130 serologically untypable isolates, 121 (93%) of them were classified into 29 serotypes using CODEHOP (COnsensus-DEgenerate Hybrid Oligonucleotide Primer)-based RT-PCR to amplify VP1 genes (VP1-CODEHOP). We further selected 52 samples for NGS and identified 59 genome sequences from 51 samples, including 8 samples containing two virus genomes. We also detected 23 genome variants (nucleotide identity < 90% compared with genome sequences in the public domain) which were potential genetic recombination, including 9 inter-serotype recombinants and 14 strains with unknown sources of recombination. CONCLUSIONS We successfully integrated VP1-CODEHOP and NGS techniques to conduct genomic analysis of serologically untypable enteroviruses.
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Affiliation(s)
- Yeh-Sheng Chien
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Zhunan, Miaoli County Taiwan
- Department of Life Sciences, National Central University, Taoyuan, Taiwan
| | - Shu-Ting Luo
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Zhunan, Miaoli County Taiwan
| | - Kuo-Chien Tsao
- Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Guishan, Taoyuan County Taiwan
- Department of Pediatrics, Linkou Chang Gung Memorial Hospital, Guishan, Taoyuan County Taiwan
| | - Yhu-Chering Huang
- Department of Pediatrics, Linkou Chang Gung Memorial Hospital, Guishan, Taoyuan County Taiwan
| | - Wan-Yu Chung
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Zhunan, Miaoli County Taiwan
| | - Yu-Chieh Liao
- Institute of Population Health Sciences, National Health Research Institutes, Zhunan, Miaoli County Taiwan
| | - Yi Tan
- Division of Infectious Diseases, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee USA
| | - Suman R. Das
- Division of Infectious Diseases, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee USA
| | - Min-Shi Lee
- Institute of Infectious Disease and Vaccinology, National Health Research Institutes, Zhunan, Miaoli County Taiwan
- National Health Research Institutes, R1-7F, 35 Keyan Road, Zhunan, Miaoli County, 350 Taiwan
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Bellocchi MC, Aragri M, Carioti L, Fabeni L, Pipitone RM, Brancaccio G, Sorbo MC, Barbaliscia S, Di Maio VC, Bronte F, Grimaudo S, Mazzucco W, Frigeri F, Cantone M, Pinto A, Perno CF, Craxì A, Gaeta GB, Di Marco V, Ceccherini-Silberstein F. NS5A Gene Analysis by Next Generation Sequencing in HCV Nosocomial Transmission Clusters of HCV Genotype 1b Infected Patients. Cells 2019; 8:E666. [PMID: 31269695 PMCID: PMC6678654 DOI: 10.3390/cells8070666] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 06/19/2019] [Accepted: 06/25/2019] [Indexed: 02/06/2023] Open
Abstract
Background: The aim of the study was to investigate the intra-host variability through next-generation-sequencing (NGS) of the NS5A-gene in nosocomial transmission-clusters observed in two Italian hospitals among hepatitis C virus (HCV)-genotype-1b infected patients. Methods: HCV-sequencing was performed by Sanger-sequencing (NS3 + NS5A + NS5B) and by NGS (NS5A, MiSeq-Illumina) in 15 HCV-1b infected patients [five acute with onco-hematologic-disease and 10 (4/6 acute/chronic) with β-thalassemia]. Resistance-associated-substitutions (RAS) were analysed by Geno2pheno-algorithm. Nucleotide-sequence-variability (NSV, at 1%, 2%, 5%, 10% and 15% NGS-cutoffs) and Shannon entropy were estimated. Phylogenetic analysis was performed by Mega6-software and Bayesian-analysis. Results: Phylogenetic analysis showed five transmission-clusters: one involving four HCV-acute onco-hematologic-patients; one involving three HCV-chronic β-thalassemia-patients and three involving both HCV-acute and chronic β-thalassemia-patients. The NS5A-RAS Y93H was found in seven patients, distributed differently among chronic/acute patients involved in the same transmission-clusters, independently from the host-genetic IL-28-polymorphism. The intra-host NSV was higher in chronic-patients versus acute-patients, at all cutoffs analyzed (p < 0.05). Even though Shannon-entropy was higher in chronic-patients, significantly higher values were observed only in chronic β-thalassemia-patients versus acute β-thalassemia-patients (p = 0.01). Conclusions: In nosocomial HCV transmission-clusters, the intra-host HCV quasispecies divergence in patients with acute-infection was very low in comparison to that in chronic-infection. The NS5A-RAS Y93H was often transmitted and distributed differently within the same transmission-clusters, independently from the IL-28-polymorphism.
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Affiliation(s)
| | - Marianna Aragri
- Department of Experimental Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Luca Carioti
- Department of Experimental Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Lavinia Fabeni
- Department of Experimental Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Rosaria Maria Pipitone
- Health Promotion Sciences, Maternal and Infant Care, Internal Medicine and Medical Specialties (PROMISE) Department, University of Palermo, 90127 Palermo, Italy
| | - Giuseppina Brancaccio
- Infectious Diseases, Department of Mental and Physical Health and Preventive Medicine, Campania University "Luigi Vanvitelli", 80138 Naples, Italy
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy
| | - Maria Chiara Sorbo
- Department of Experimental Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Silvia Barbaliscia
- Department of Experimental Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Velia Chiara Di Maio
- Department of Experimental Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Fabrizio Bronte
- Health Promotion Sciences, Maternal and Infant Care, Internal Medicine and Medical Specialties (PROMISE) Department, University of Palermo, 90127 Palermo, Italy
| | - Stefania Grimaudo
- Health Promotion Sciences, Maternal and Infant Care, Internal Medicine and Medical Specialties (PROMISE) Department, University of Palermo, 90127 Palermo, Italy
| | - Walter Mazzucco
- Health Promotion Sciences, Maternal and Infant Care, Internal Medicine and Medical Specialties (PROMISE) Department, University of Palermo, 90127 Palermo, Italy
| | | | - Marco Cantone
- Infectious Diseases, Department of Mental and Physical Health and Preventive Medicine, Campania University "Luigi Vanvitelli", 80138 Naples, Italy
| | - Antonio Pinto
- Hematology Department, National Cancer Institute "Fondazione Pascale", IRCCS, 80131 Naples, Italy
| | - Carlo Federico Perno
- Department of Microbiology and Clinic Microbiology, University of Milan, 20162 Milan, Italy
| | - Antonio Craxì
- Health Promotion Sciences, Maternal and Infant Care, Internal Medicine and Medical Specialties (PROMISE) Department, University of Palermo, 90127 Palermo, Italy
| | - Giovanni Battista Gaeta
- Infectious Diseases, Department of Mental and Physical Health and Preventive Medicine, Campania University "Luigi Vanvitelli", 80138 Naples, Italy
| | - Vito Di Marco
- Health Promotion Sciences, Maternal and Infant Care, Internal Medicine and Medical Specialties (PROMISE) Department, University of Palermo, 90127 Palermo, Italy
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Fernández-Caso B, Fernández-Caballero JÁ, Chueca N, Rojo E, de Salazar A, García Buey L, Cardeñoso L, García F. Infection with multiple hepatitis C virus genotypes detected using commercial tests should be confirmed using next generation sequencing. Sci Rep 2019; 9:9264. [PMID: 31239457 PMCID: PMC6592891 DOI: 10.1038/s41598-019-42605-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Accepted: 04/01/2019] [Indexed: 12/21/2022] Open
Abstract
Current HCV genotyping methods may have some limitations in detecting mixed infections. We aimed to determine the accuracy of genotyping and the detection of mixed-genotype infections using the Abbott-RealTime HCV Genotype II assay (Abbott-RT-PCR) in comparison with a Roche-Next Generation Sequencing assay (Roche-NGS). Plasma samples collected from 139 HCV-infected patients tested with Abbott-RT-PCR, 114 with single genotype (GT) and 25 with mixed GTs were genotyped using Roche-NGS. Roche-NGS confirmed all single GTs obtained with Abbott-RT-PCR. One case of Abbott GT 4 was found as GT 1a using Roche-NGS. Genotype 5 was confirmed using Roche-NGS in 75% cases (3 out of 4 cases). Twenty-five patients were identified as having mixed HCVinfections using Abbott-RT-PCR. The concordance between Abbott-RT-PCR and Roche-NGS was 76% (19 out of 25 cases). Three mixed-GT infections identified with the Abbott assay (two (1b + 4); one (1a + 3)) were reported as pure 1b using Roche-NGS. Very divergent results were found for the other three samples. When compared to Roche-NGS, Abbott-RT-PCR has performed excellently for the determination of patients infected with single GTs. For patients that are categorized as having a mixed infection using Abbott-RT-PCR, we recommend an NGS assay as a confirmation test.
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Affiliation(s)
- Belén Fernández-Caso
- Servicio de Microbiologia, Hospital Universitario de La Princesa; Instituto de Investigacion Sanitaria La Princesa, Madrid, Spain
| | - Jose Ángel Fernández-Caballero
- Unidad de Gestión Clinica de Microbiologia, Hospital Universitario San Cecilio; Instituto de Investigación Biosanitaria ibs.Granada; Red de Investigación en SIDA, RD16/0025/0040, Granada, Spain
| | - Natalia Chueca
- Unidad de Gestión Clinica de Microbiologia, Hospital Universitario San Cecilio; Instituto de Investigación Biosanitaria ibs.Granada; Red de Investigación en SIDA, RD16/0025/0040, Granada, Spain
| | - Eukene Rojo
- Servicio de Aparato Digestivo - Unidad de Hepatologia, Hospital Universitario de La Princesa; Instituto de Investigacion Sanitaria La Princesa, Madrid, Spain
| | - Adolfo de Salazar
- Unidad de Gestión Clinica de Microbiologia, Hospital Universitario San Cecilio; Instituto de Investigación Biosanitaria ibs.Granada; Red de Investigación en SIDA, RD16/0025/0040, Granada, Spain
| | - Luisa García Buey
- Servicio de Aparato Digestivo - Unidad de Hepatologia, Hospital Universitario de La Princesa; Instituto de Investigacion Sanitaria La Princesa, Madrid, Spain
| | - Laura Cardeñoso
- Servicio de Microbiologia, Hospital Universitario de La Princesa; Instituto de Investigacion Sanitaria La Princesa, Madrid, Spain
| | - Federico García
- Unidad de Gestión Clinica de Microbiologia, Hospital Universitario San Cecilio; Instituto de Investigación Biosanitaria ibs.Granada; Red de Investigación en SIDA, RD16/0025/0040, Granada, Spain.
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Ma L, Jakobiec FA, Dryja TP. A Review of Next-Generation Sequencing (NGS): Applications to the Diagnosis of Ocular Infectious Diseases. Semin Ophthalmol 2019; 34:223-231. [PMID: 31170015 DOI: 10.1080/08820538.2019.1620800] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Purpose: To review the value of next-generation sequencing (NGS) in identifying the pathogens which cause ocular infections, thereby facilitating prompt initiation of treatment with an optimal anti-microbial regimen. Both contemporary and futuristic approaches to identifying pathogens in ocular infections are covered in this brief overview. Methods: Review of the peer reviewed literature on conventional and advanced methods as applied to the diagnosis of infectious diseases of the eye. Conclusion: NGS is a novel technology for identifying the pathogens responsible for ocular infections with the potential to improve the accuracy and speed of diagnosis and hastening the selection of the best therapy.
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Affiliation(s)
- Lina Ma
- a David G Cogan Laboratory of Ophthalmic Pathology, Massachusetts Eye and Ear Infirmary , Harvard Medical School , Boston , MA , USA
| | - Frederick A Jakobiec
- a David G Cogan Laboratory of Ophthalmic Pathology, Massachusetts Eye and Ear Infirmary , Harvard Medical School , Boston , MA , USA
| | - Thaddeus P Dryja
- a David G Cogan Laboratory of Ophthalmic Pathology, Massachusetts Eye and Ear Infirmary , Harvard Medical School , Boston , MA , USA
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Abstract
Viruses, which are the most abundant biological entities on the planet, have been regarded as the "dark matter" of biology in the sense that despite their ubiquity and frequent presence in large numbers, their detection and analysis are not always straightforward. The majority of them are very small (falling under the limit of 0.5 μm), and collectively, they are extraordinarily diverse. In fact, the majority of the genetic diversity on the planet is found in the so-called virosphere, or the world of viruses. Furthermore, the most frequent viral agents of disease in humans display an RNA genome, and frequently evolve very fast, due to the fact that most of their polymerases are devoid of proofreading activity. Therefore, their detection, genetic characterization, and epidemiological surveillance are rather challenging. This review (part of the Curated Collection on Advances in Molecular Epidemiology of Infectious Diseases) describes many of the methods that, throughout the last few decades, have been used for viral detection and analysis. Despite the challenge of having to deal with high genetic diversity, the majority of these methods still depend on the amplification of viral genomic sequences, using sequence-specific or sequence-independent approaches, exploring thermal profiles or a single nucleic acid amplification temperature. Furthermore, viral populations, and especially those with RNA genomes, are not usually genetically uniform but encompass swarms of genetically related, though distinct, viral genomes known as viral quasispecies. Therefore, sequence analysis of viral amplicons needs to take this fact into consideration, as it constitutes a potential analytic problem. Possible technical approaches to deal with it are also described here. *This article is part of a curated collection.
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58
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Naugler C, Church DL. Clinical laboratory utilization management and improved healthcare performance. Crit Rev Clin Lab Sci 2019. [DOI: 10.1080/10408363.2018.1526164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Christopher Naugler
- Department of Pathology and Laboratory Medicine, University of Calgary, Calgary, Canada
- Department of Family Medicine, University of Calgary, Calgary, Canada
- Department of Community Health Sciences, University of Calgary, Calgary, Canada
| | - Deirdre L. Church
- Department of Pathology and Laboratory Medicine, University of Calgary, Calgary, Canada
- Department of Medicine, University of Calgary, Calgary, Canada
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Franzo G, Kekarainen T, Llorens A, Correa-Fiz F, Segalés J. Exploratory metagenomic analyses of periweaning failure-to-thrive syndrome-affected pigs. Vet Rec 2019; 184:25. [DOI: 10.1136/vr.105125] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 09/24/2018] [Accepted: 10/25/2018] [Indexed: 12/23/2022]
Affiliation(s)
- Giovanni Franzo
- Department of Animal Medicine, Production and Health (MAPS); University of Padua; Legnaro Italy
| | | | - Anna Llorens
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona; Bellaterra Spain
| | - Florencia Correa-Fiz
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona; Bellaterra Spain
| | - Joaquim Segalés
- UAB, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona; Bellaterra Spain
- Departament de Sanitat i Anatomia Animals, Facultat de Veterinària, UAB; Bellaterra Spain
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Rastogi M, Singh SK. Advances in Molecular Diagnostic Approaches for Biothreat Agents. DEFENSE AGAINST BIOLOGICAL ATTACKS 2019. [PMCID: PMC7123646 DOI: 10.1007/978-3-030-03071-1_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
The advancement in Molecular techniques has been implicated in the development of sophisticated, high-end diagnostic platform and point-of-care (POC) devices for the detection of biothreat agents. Different molecular and immunological approaches such as Immunochromatographic and lateral flow assays, Enzyme-linked Immunosorbent assays (ELISA), Biosensors, Isothermal amplification assays, Nucleic acid amplification tests (NAATs), Next Generation Sequencers (NGS), Microarrays and Microfluidics have been used for a long time as detection strategies of the biothreat agents. In addition, several point of care (POC) devices have been approved by FDA and commercialized in markets. The high-end molecular platforms like NGS and Microarray are time-consuming, costly, and produce huge amount of data. Therefore, the future prospects of molecular based technique should focus on developing quick, user-friendly, cost-effective and portable devices against biological attacks and surveillance programs.
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Clinical Manifestations and Laboratory Tests of AECHB and Severe Hepatitis (Liver Failure). ACUTE EXACERBATION OF CHRONIC HEPATITIS B 2019. [PMCID: PMC7418529 DOI: 10.1007/978-94-024-1603-9_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This chapter describes the clinical symptoms and signs of AECHB and HBV ACLF, classification, grading of HBV ACLF and their features, diagnostic principles and standards in liver pathology, biochemistry, and virology of HBV ACLF.Liver failure is defined as serious damage to the liver cause by a variety of etiologies, leading to liver function disorder or even decompensation, and clinical syndromes with coagulopathy, jaundice, hepatic encephalopathy, and ascites. Severe hepatitis B can be indicated pathologically by apparent hepatocellular necrosis, including extensive multifocal, confluent, bridging, sub-massive or massive necrosis. Laboratory tests during the course of severe exacerbation of chronic hepatitis B can reflect pathological changes and liver function in a timely manner, providing objective and informative reference data for evaluation of disease severity and treatment efficacy. Among the most important laboratory tests are those for prothrombin activity, international normalized ratio, and increases in total bilirubin concentration. Severe hepatitis B is associated with interactions between the virus and host factors. Detection of HBV DNA, HBV genotype, quasispecies and HBV mutation can provide important theoretical bases for the prevention, control or mitigation of the progress of severe hepatitis B. Noninvasive imaging modalities can be used to visualize the entire liver and parts of it. Measuring liver volume to evaluate liver size and liver reserve capacity is regarded as important in diagnosis, surgical approach and prognostic evaluation of patients with severe exacerbation of chronic hepatitis B and liver failure. Model for End-Stage Liver Disease (MELD) is the first quantitative method developed to assess whether a patient with liver failure requires a liver transplant. The predictive value of the MELD model has been improved by the MELD-Na, iMELD, and MESO models. Several other valuable prognostic models have been developed. For example, for patients with HBV-ACLF, the established TPPM scoring system was found to be more predictive than MELD score.
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Bioinformatics and Microarray-Based Technologies to Viral Genome Sequence Analysis. MICROBIAL GENOMICS IN SUSTAINABLE AGROECOSYSTEMS 2019. [PMCID: PMC7121691 DOI: 10.1007/978-981-13-8739-5_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Identification of microbial pathogen is an important event which lead to diagnosis, treatment, and control of infections produce by them. The high-throughput technology like microarray and new-generation sequencing machine are able to generate huge amount of nucleotide sequences of viral and bacterial genome of both known and unknown pathogens. Few years ago it was the DNA microarrays which had great potential to screen all the known pathogens and yet to be identified pathogen simultaneously. But after the development of a new generation sequencing, technologies and advance computational approach researchers are looking forward for a complete understanding of microbes and host interactions. The powerful sequencing platform is rapidly transforming the landscape of microbial identification and characterization. As bioinformatics analysis tools and databases are easily available to researchers, the enormous amount of data generated can be meaningfully handled for better understanding of the microbial world. Here in this chapter, we present commentary on how the computational method incorporated with sequencing technique made easy for microbial detection and characterization.
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Pou C, Barrientos-Somarribas M, Marin-Juan S, Bogdanovic G, Bjerkner A, Allander T, Gustafsson B, Andersson B. Virome definition in cerebrospinal fluid of patients with neurological complications after hematopoietic stem cell transplantation. J Clin Virol 2018; 108:112-120. [DOI: 10.1016/j.jcv.2018.09.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 09/06/2018] [Accepted: 09/18/2018] [Indexed: 01/16/2023]
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Maggi F, Focosi D, Statzu M, Bianco G, Costa C, Macera L, Spezia PG, Medici C, Albert E, Navarro D, Scagnolari C, Pistello M, Cavallo R, Antonelli G. Early Post-Transplant Torquetenovirus Viremia Predicts Cytomegalovirus Reactivations In Solid Organ Transplant Recipients. Sci Rep 2018; 8:15490. [PMID: 30341363 PMCID: PMC6195516 DOI: 10.1038/s41598-018-33909-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 08/07/2018] [Indexed: 12/31/2022] Open
Abstract
Monitoring the human virome has been recently suggested as a promising and novel area of research for identifying new biomarkers which would help physicians in the management of transplant patients. Imbalance of the immune system in transplant recipients has a significant impact on replication of Torquetenovirus (TTV), the most representative and abundant virus of human virome. TTV kinetic was studied by real-time PCR in 280 liver or kidney transplant recipients who underwent different drug regimens to maintain immunosuppression. During one-year post-transplant follow-up, TTV viremia fluctuated irrespective of transplanted organ type but consistent with the immunosuppression regimen. TTV kinetic in patients who manifested cytomegalovirus (CMV) reactivation within the first four months post-transplant differed from that observed in patients who did not experience CMV complications. Importantly, plasma TTV load measured between day 0 and 10 post-transplant was significantly higher in CMV DNA positive than in CMV DNA negative patients. TTV viremia above 3.45 log DNA copies/ml within the first 10 days post-transplant correlates with higher propensity to CMV reactivation following transplantation. This study provides further evidence for using early post-transplant TTV viremia to predict CMV reactivation in liver or kidney transplant recipients.
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Affiliation(s)
- Fabrizio Maggi
- Retrovirus Center and Virology Section, Department of Translational Research, University of Pisa, Pisa, Italy. .,Virology Unit, Pisa University Hospital, Pisa, Italy.
| | - Daniele Focosi
- North-Western Tuscany Blood Bank, Pisa University Hospital, Pisa, Italy
| | - Maura Statzu
- Department of Molecular Medicine, Laboratory of Virology and Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, Rome, Italy
| | - Gabriele Bianco
- Microbiology and Virology Unit, Laboratory of Virology, Azienda Ospedaliero Universitaria "Città della Salute e della Scienza" Turin, Turin, Italy
| | - Cristina Costa
- Microbiology and Virology Unit, Laboratory of Virology, Azienda Ospedaliero Universitaria "Città della Salute e della Scienza" Turin, Turin, Italy
| | - Lisa Macera
- Retrovirus Center and Virology Section, Department of Translational Research, University of Pisa, Pisa, Italy.,Virology Unit, Pisa University Hospital, Pisa, Italy
| | - Pietro Giorgio Spezia
- Retrovirus Center and Virology Section, Department of Translational Research, University of Pisa, Pisa, Italy
| | - Chiara Medici
- Virology Unit, Pisa University Hospital, Pisa, Italy
| | - Eliseo Albert
- Department of Microbiology, School of Medicine, University of Valencia, Valencia, Spain
| | - David Navarro
- Department of Microbiology, School of Medicine, University of Valencia, Valencia, Spain
| | - Carolina Scagnolari
- Department of Molecular Medicine, Laboratory of Virology and Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, Rome, Italy
| | - Mauro Pistello
- Retrovirus Center and Virology Section, Department of Translational Research, University of Pisa, Pisa, Italy.,Virology Unit, Pisa University Hospital, Pisa, Italy
| | - Rossana Cavallo
- Microbiology and Virology Unit, Laboratory of Virology, Azienda Ospedaliero Universitaria "Città della Salute e della Scienza" Turin, Turin, Italy
| | - Guido Antonelli
- Department of Molecular Medicine, Laboratory of Virology and Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, Rome, Italy
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65
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Yamaguchi J, Olivo A, Laeyendecker O, Forberg K, Ndembi N, Mbanya D, Kaptue L, Quinn TC, Cloherty GA, Rodgers MA, Berg MG. Universal Target Capture of HIV Sequences From NGS Libraries. Front Microbiol 2018; 9:2150. [PMID: 30271393 PMCID: PMC6146096 DOI: 10.3389/fmicb.2018.02150] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 08/22/2018] [Indexed: 11/13/2022] Open
Abstract
Background: Global surveillance of viral sequence diversity is needed to keep pace with the constant evolution of HIV. Recent next generation sequencing (NGS) methods have realized the goal of sequencing circulating virus directly from patient specimens. Yet, a simple, universal approach that maximizes sensitivity and sequencing capacity remains elusive. Here we present a novel HIV enrichment strategy to yield near complete genomes from low viral load specimens. Methodology: A non-redundant biotin-labeled probe set (HIV-xGen; n = 652) was synthesized to tile all HIV-1 (groups M, N, O, and P) and HIV-2 (A and B) strains. Illumina Nextera barcoded libraries of either gene-specific or randomly primed cDNA derived from infected plasma were hybridized to probes in a single pool and unbound sequences were washed away. Captured viral cDNA was amplified by Illumina adaptor primers, sequenced on a MiSeq, and NGS reads were demultiplexed for alignment with CLC Bio software. Results: HIV-xGen probes selectively captured and amplified reads spanning the entirety of the HIV phylogenetic tree. HIV sequences clearly present in unenriched libraries of specimens but previously not observed due to high host background levels, insufficient sequencing depth or the extent of multiplexing, were now enriched by >1,000-fold. Thus, xGen selection not only substantially increased the depth of existing sequence, but also extended overall genome coverage by an average of 40%. We characterized 50 new, diverse HIV strains from clinical specimens and demonstrated a viral load cutoff of approximately log 3.5 copies/ml for full length coverage. Genome coverage was <20% for 5/10 samples with viral loads <log 3.5 copies/ml and >90% for 35/40 samples with higher viral loads. Conclusions: Characterization of >20 complete genomes at a time is now possible from a single probe hybridization and MiSeq run. With the versatility to capture all HIV strains and the sensitivity to detect low titer specimens, HIV-xGen will serve as an important tool for monitoring HIV sequence diversity.
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Affiliation(s)
- Julie Yamaguchi
- Infectious Diseases Research, Abbott Diagnostics, Chicago, IL, United States
| | - Ana Olivo
- Infectious Diseases Research, Abbott Diagnostics, Chicago, IL, United States
| | - Oliver Laeyendecker
- National Institute of Allergy and Infectious Diseases, NIH, Baltimore, MD, United States
| | - Kenn Forberg
- Infectious Diseases Research, Abbott Diagnostics, Chicago, IL, United States
| | | | - Dora Mbanya
- Université de Yaoundé 1, Yaoundé, Cameroon.,University of Bamenda, Bamenda, Cameroon
| | | | - Thomas C Quinn
- National Institute of Allergy and Infectious Diseases, NIH, Baltimore, MD, United States
| | - Gavin A Cloherty
- Infectious Diseases Research, Abbott Diagnostics, Chicago, IL, United States
| | - Mary A Rodgers
- Infectious Diseases Research, Abbott Diagnostics, Chicago, IL, United States
| | - Michael G Berg
- Infectious Diseases Research, Abbott Diagnostics, Chicago, IL, United States
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66
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Pallás V, Sánchez-Navarro JA, James D. Recent Advances on the Multiplex Molecular Detection of Plant Viruses and Viroids. Front Microbiol 2018; 9:2087. [PMID: 30250456 PMCID: PMC6139301 DOI: 10.3389/fmicb.2018.02087] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 08/15/2018] [Indexed: 12/14/2022] Open
Abstract
Plant viruses are still one of the main contributors to economic losses in agriculture. It has been estimated that plant viruses can cause as much as 50 billion euros loss worldwide, per year. This situation may be worsened by recent climate change events and the associated changes in disease epidemiology. Reliable and early detection methods are still one of the main and most effective actions to develop control strategies for plant viral diseases. During the last years, considerable progress has been made to develop tools with high specificity and low detection limits for use in the detection of these plant pathogens. Time and cost reductions have been some of the main objectives pursued during the last few years as these increase their feasibility for routine use. Among other strategies, these objectives can be achieved by the simultaneous detection and (or) identification of several viruses in a single assay. Nucleic acid-based detection techniques are especially suitable for this purpose. Polyvalent detection has allowed the detection of multiple plant viruses at the genus level. Multiplexing RT polymerase chain reaction (PCR) has been optimized for the simultaneous detection of more than 10 plant viruses/viroids. In this short review, we provide an update on the progress made during the last decade on techniques such as multiplex PCR, polyvalent PCR, non-isotopic molecular hybridization techniques, real-time PCR, and array technologies to allow simultaneous detection of multiple plant viruses. Also, the potential and benefits of the powerful new technique of deep sequencing/next-generation sequencing are described.
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Affiliation(s)
- Vicente Pallás
- Instituto de Biología Molecular y Celular de Plantas, IBMCP, Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas, Valencia, Spain
| | - Jesus A. Sánchez-Navarro
- Instituto de Biología Molecular y Celular de Plantas, IBMCP, Universitat Politècnica de València – Consejo Superior de Investigaciones Científicas, Valencia, Spain
| | - Delano James
- Sidney Laboratory, Canadian Food Inspection Agency, Sidney, BC, Canada
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67
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Saleem S, Ali A, Khubaib B, Akram M, Fatima Z, Idrees M. Genetic diversity of Hepatitis C Virus in Pakistan using Next Generation Sequencing. J Clin Virol 2018; 108:26-31. [PMID: 30219747 DOI: 10.1016/j.jcv.2018.09.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 08/14/2018] [Accepted: 09/07/2018] [Indexed: 01/06/2023]
Abstract
BACKGROUND In Pakistan, HCV disease is considered a major public health issue with about 10-17 million people suffering with this infection and rate is increasing every day without any hindrance. The currently available Pyrosequencing approach used to analyze complex viral genomes as it can determine minor variants. It is crucial to understand viral evolution and quasispecies diversity in complex viral strains. OBJECTIVES To assess genetic diversity in patients with HCV using Next Generation Sequencing (NGS) and compare nucleotide diversity of genotype 3a with respect to other genotypes. STUDY DESIGN Intra-host viral diversity of HCV was determined using NGS from 13 chronically HCV infected individuals. NGS of three different regions (E2 (HVR1), NS3 and NS5B) of HCV-3a allowed for a comprehensive analysis of the viral population. RESULT Phylogenetic analysis of different HCV genes revealed great variability within the Pakistani population. The average nucleotide diversity for HVR1, NS3 and NS5B was 0.029, 0.011 and 0.010 respectively. CONCLUSION Our findings clearly indicate that patient-2 greater quasispecies heterogeneity than other patients of same genotype-3a using phylogenetic and one step network analyses. Initially phylogenetic analysis of these three genes showed that genotype 3a samples have greater genetic diversity. However, no significant difference was determined when nucleotide variability of genotype 3a compared with other genotypes (1a, 1b, 2a & 4a).
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Affiliation(s)
- Sana Saleem
- Division of Molecular Virology and Molecular Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, Lahore 87-West Canal Bank Road Thokar Niaz Baig, Lahore, Pakistan.
| | - Amjad Ali
- Molecular Virology laboratory, Centre for Applied Molecular Biology (CAMB) University of the Punjab, Lahore 87-West Canal Bank Road Thokar Niaz Baig, Lahore, Pakistan.
| | - Bushra Khubaib
- Division of Molecular Virology and Molecular Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, Lahore 87-West Canal Bank Road Thokar Niaz Baig, Lahore, Pakistan; Department of Biotechnology, Lahore College for Women University, Lahore, Pakistan.
| | - Madiha Akram
- Division of Molecular Virology and Molecular Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, Lahore 87-West Canal Bank Road Thokar Niaz Baig, Lahore, Pakistan; Department of Biotechnology, Lahore College for Women University, Lahore, Pakistan.
| | - Zareen Fatima
- Division of Molecular Virology and Molecular Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, Lahore 87-West Canal Bank Road Thokar Niaz Baig, Lahore, Pakistan; Bioinformatics & Biotechnology, International Islamic University, Sector H-10, New Campus, Islamabad, Pakistan.
| | - Muhammad Idrees
- Division of Molecular Virology and Molecular Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, Lahore 87-West Canal Bank Road Thokar Niaz Baig, Lahore, Pakistan; Vice Chancellor Hazara University Mansehra, Khyber Pakhtunkhwa, Pakistan.
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68
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Loka TP, Tausch SH, Dabrowski PW, Radonic A, Nitsche A, Renard BY. PriLive: privacy-preserving real-time filtering for next-generation sequencing. Bioinformatics 2018. [PMID: 29522157 DOI: 10.1093/bioinformatics/bty128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Motivation In next-generation sequencing, re-identification of individuals and other privacy-breaching strategies can be applied even for anonymized data. This also holds true for applications in which human DNA is acquired as a by-product, e.g. for viral or metagenomic samples from a human host. Conventional data protection strategies including cryptography and post-hoc filtering are only appropriate for the final and processed sequencing data. This can result in an insufficient level of data protection and a considerable time delay in the further analysis workflow. Results We present PriLive, a novel tool for the automated removal of sensitive data while the sequencing machine is running. Thereby, human sequence information can be detected and removed before being completely produced. This facilitates the compliance with strict data protection regulations. The unique characteristic to cause almost no time delay for further analyses is also a clear benefit for applications other than data protection. Especially if the sequencing data are dominated by known background signals, PriLive considerably accelerates consequent analyses by having only fractions of input data. Besides these conceptual advantages, PriLive achieves filtering results at least as accurate as conventional post-hoc filtering tools. Availability and implementation PriLive is open-source software available at https://gitlab.com/rki_bioinformatics/PriLive. Supplementary information Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Tobias P Loka
- Bioinformatics Division (MF 1), Department for Methods Development and Research Infrastructure
| | - Simon H Tausch
- Bioinformatics Division (MF 1), Department for Methods Development and Research Infrastructure.,Centre for Biological Threats and Special Pathogens: Highly Pathogenic Viruses (ZBS 1)
| | - Piotr W Dabrowski
- Bioinformatics Division (MF 1), Department for Methods Development and Research Infrastructure
| | - Aleksandar Radonic
- Centre for Biological Threats and Special Pathogens: Highly Pathogenic Viruses (ZBS 1).,Genome Sequencing Unit (MF 2), Department for Methods Development and Research Infrastructure, Robert Koch Institute, Berlin, Germany
| | - Andreas Nitsche
- Centre for Biological Threats and Special Pathogens: Highly Pathogenic Viruses (ZBS 1)
| | - Bernhard Y Renard
- Bioinformatics Division (MF 1), Department for Methods Development and Research Infrastructure
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69
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Bhuvaneshwar K, Song L, Madhavan S, Gusev Y. viGEN: An Open Source Pipeline for the Detection and Quantification of Viral RNA in Human Tumors. Front Microbiol 2018; 9:1172. [PMID: 29922260 PMCID: PMC5996193 DOI: 10.3389/fmicb.2018.01172] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Accepted: 05/15/2018] [Indexed: 01/05/2023] Open
Abstract
An estimated 17% of cancers worldwide are associated with infectious causes. The extent and biological significance of viral presence/infection in actual tumor samples is generally unknown but could be measured using human transcriptome (RNA-seq) data from tumor samples. We present an open source bioinformatics pipeline viGEN, which allows for not only the detection and quantification of viral RNA, but also variants in the viral transcripts. The pipeline includes 4 major modules: The first module aligns and filter out human RNA sequences; the second module maps and count (remaining un-aligned) reads against reference genomes of all known and sequenced human viruses; the third module quantifies read counts at the individual viral-gene level thus allowing for downstream differential expression analysis of viral genes between case and controls groups. The fourth module calls variants in these viruses. To the best of our knowledge, there are no publicly available pipelines or packages that would provide this type of complete analysis in one open source package. In this paper, we applied the viGEN pipeline to two case studies. We first demonstrate the working of our pipeline on a large public dataset, the TCGA cervical cancer cohort. In the second case study, we performed an in-depth analysis on a small focused study of TCGA liver cancer patients. In the latter cohort, we performed viral-gene quantification, viral-variant extraction and survival analysis. This allowed us to find differentially expressed viral-transcripts and viral-variants between the groups of patients, and connect them to clinical outcome. From our analyses, we show that we were able to successfully detect the human papilloma virus among the TCGA cervical cancer patients. We compared the viGEN pipeline with two metagenomics tools and demonstrate similar sensitivity/specificity. We were also able to quantify viral-transcripts and extract viral-variants using the liver cancer dataset. The results presented corresponded with published literature in terms of rate of detection, and impact of several known variants of HBV genome. This pipeline is generalizable, and can be used to provide novel biological insights into microbial infections in complex diseases and tumorigeneses. Our viral pipeline could be used in conjunction with additional type of immuno-oncology analysis based on RNA-seq data of host RNA for cancer immunology applications. The source code, with example data and tutorial is available at: https://github.com/ICBI/viGEN/.
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Affiliation(s)
- Krithika Bhuvaneshwar
- Innovation Center for Biomedical Informatics, Georgetown University, Washington, DC, United States
| | - Lei Song
- Innovation Center for Biomedical Informatics, Georgetown University, Washington, DC, United States
| | - Subha Madhavan
- Innovation Center for Biomedical Informatics, Georgetown University, Washington, DC, United States
| | - Yuriy Gusev
- Innovation Center for Biomedical Informatics, Georgetown University, Washington, DC, United States
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70
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Blackcurrant Leaf Chlorosis Associated Virus: Evidence of the Presence of Circular RNA during Infections. Viruses 2018; 10:v10050260. [PMID: 29762514 PMCID: PMC5977253 DOI: 10.3390/v10050260] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 04/27/2018] [Accepted: 05/11/2018] [Indexed: 01/13/2023] Open
Abstract
Blackcurrant leaf chlorosis associated virus (BCLCaV) was detected recently by next-generation sequencing (NGS) and a new and distinct species in the genus Idaeovirus was proposed. Analysis of NGS-derived paired-end reads revealed the existence of bridge reads encompassing the 3′-terminus and 5′-terminus of RNA-2 or RNA-3 of BCLCaV. The full RNA-2 or RNA-3 could be amplified using outward facing or abutting primers; also, RNA-2/RNA-3 could be detected even after three consecutive RNase R enzyme treatments, with denaturation at 95 °C preceding each digestion. Evidence was obtained indicating that there are circular forms of BCLCaV RNA-2 and RNA-3.
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71
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Reeves DB, Magaret AS, Greninger AL, Johnston C, Schiffer JT. Model-based estimation of superinfection prevalence from limited datasets. J R Soc Interface 2018; 15:20170968. [PMID: 29491180 PMCID: PMC5832741 DOI: 10.1098/rsif.2017.0968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 02/05/2018] [Indexed: 12/24/2022] Open
Abstract
Humans can be infected sequentially by different strains of the same virus. Estimating the prevalence of so-called 'superinfection' for a particular pathogen is vital because superinfection implies a failure of immunologic memory against a given virus despite past exposure, which may signal challenges for future vaccine development. Increasingly, viral deep sequencing and phylogenetic inference can discriminate distinct strains within a host. Yet, a population-level study may misrepresent the true prevalence of superinfection for several reasons. First, certain infections such as herpes simplex virus (HSV-2) only reactivate single strains, making multiple samples necessary to detect superinfection. Second, the number of samples collected in a study may be fewer than the actual number of independently acquired strains within a single person. Third, detecting strains that are relatively less abundant can be difficult, even for other infections such as HIV-1 where deep sequencing may identify multiple strains simultaneously. Here we develop a model of superinfection inspired by ecology. We define an infected individual's richness as the number of infecting strains and use ecological evenness to quantify the relative strain abundances. The model uses an EM methodology to infer the true prevalence of superinfection from limited clinical datasets. Simulation studies with known true prevalence are used to contrast our EM method to a standard (naive) calculation. While varying richness, evenness and sampling we quantify the accuracy and precision of our method. The EM method outperforms in all cases, particularly when sampling is low, and richness or unevenness is high. Here, sensitivity to our assumptions about clinical data is considered. The simulation studies also provide insight into optimal study designs; estimates of prevalence improve equally by enrolling more participants or gathering more samples per person. Finally, we apply our method to data from published studies of HSV-2 and HIV-1 superinfection.
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Affiliation(s)
- Daniel B Reeves
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Amalia S Magaret
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
- Department of Laboratory Medicine, University of Washington, Seattle, WA, USA
- Biostatistics, University of Washington, Seattle, WA, USA
| | - Alex L Greninger
- Department of Laboratory Medicine, University of Washington, Seattle, WA, USA
| | - Christine Johnston
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
- Department of Medicine, University of Washington, Seattle, WA, USA
| | - Joshua T Schiffer
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
- Department of Medicine, University of Washington, Seattle, WA, USA
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72
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Greninger AL. A decade of RNA virus metagenomics is (not) enough. Virus Res 2018; 244:218-229. [PMID: 29055712 PMCID: PMC7114529 DOI: 10.1016/j.virusres.2017.10.014] [Citation(s) in RCA: 89] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Revised: 10/14/2017] [Accepted: 10/17/2017] [Indexed: 12/16/2022]
Abstract
It is hard to overemphasize the role that metagenomics has had on our recent understanding of RNA virus diversity. Metagenomics in the 21st century has brought with it an explosion in the number of RNA virus species, genera, and families far exceeding that following the discovery of the microscope in the 18th century for eukaryotic life or culture media in the 19th century for bacteriology or the 20th century for virology. When the definition of success in organism discovery is measured by sequence diversity and evolutionary distance, RNA viruses win. This review explores the history of RNA virus metagenomics, reasons for the successes so far in RNA virus metagenomics, and methodological concerns. In addition, the review briefly covers clinical metagenomics and environmental metagenomics and highlights some of the critical accomplishments that have defined the fast pace of RNA virus discoveries in recent years. Slightly more than a decade in, the field is exhausted from its discoveries but knows that there is yet even more out there to be found.
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Affiliation(s)
- Alexander L Greninger
- Virology Division, Department of Laboratory Medicine, University of Washington, Seattle, WA, United States; Fred Hutchinson Cancer Research Center, Seattle, WA, United States
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73
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Chun S, Muthu M, Gopal J, Paul D, Kim DH, Gansukh E, Anthonydhason V. The unequivocal preponderance of biocomputation in clinical virology. RSC Adv 2018; 8:17334-17345. [PMID: 35539262 PMCID: PMC9080393 DOI: 10.1039/c8ra00888d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 03/14/2018] [Indexed: 11/22/2022] Open
Abstract
Bioinformatics and computer based data simulation and modeling are captivating biological research, delivering great results already and promising to deliver more. As biological research is a complex, intricate, diverse field, any available support is gladly taken. With recent outbreaks and epidemics, pathogens are a constant threat to the global economy and security. Virus related plagues are somehow the most difficult to handle. Biocomputation has provided appreciable help in resolving clinical virology related issues. This review, for the first time, surveys the current status of the role of computation in virus related research. Advances made in the fields of clinical virology, antiviral drug design, viral immunology and viral oncology, through input from biocomputation, have been discussed. The amount of progress made and the software platforms available are consolidated in this review. The limitations of computation based methods are presented. Finally, the challenges facing the future of biocomputation in clinical virology are speculated upon. Biocomputation in clinical virology.![]()
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Affiliation(s)
- Sechul Chun
- Department of Environmental Health Science
- Konkuk University
- Seoul 143-701
- Korea
| | - Manikandan Muthu
- Department of Environmental Health Science
- Konkuk University
- Seoul 143-701
- Korea
| | - Judy Gopal
- Department of Environmental Health Science
- Konkuk University
- Seoul 143-701
- Korea
| | - Diby Paul
- Environmental Microbiology
- Department of Environmental Engineering
- Konkuk University
- Seoul 143-701
- Korea
| | - Doo Hwan Kim
- Department of Environmental Health Science
- Konkuk University
- Seoul 143-701
- Korea
| | - Enkhtaivan Gansukh
- Department of Environmental Health Science
- Konkuk University
- Seoul 143-701
- Korea
| | - Vimala Anthonydhason
- Department of Biotechnology
- Indian Institute of Technology-Madras
- Chennai 600036
- India
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74
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Monteil-Bouchard S, Temmam S, Desnues C. Protocol for Generating Infectious RNA Viromes from Complex Biological Samples. Methods Mol Biol 2018; 1838:25-36. [PMID: 30128987 DOI: 10.1007/978-1-4939-8682-8_3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This chapter proposes a simple, standardized protocol for generating RNA viromes from complex host-associated biological samples of various origins. Compared to other existing protocols to generate RNA viromes, this protocol preserves the infectivity of viral particles and allows for downstream applications such as viral characterization and isolation tests.
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Affiliation(s)
- Sonia Monteil-Bouchard
- Unité de Recherche sur les Maladies Infectieuses Tropicales Emergentes (URMITE), IHU Méditerranée Infection, Assistance-Publique des Hôpitaux de Marseille, Aix-Marseille Université, CNRS 7278, IRD 198, INSERM1095, Marseille, France
| | - Sarah Temmam
- Biology of Infection Unit, Laboratory of Pathogen Discovery, Institut Pasteur, INSERM U1117, Paris, France
| | - Christelle Desnues
- Unité de Recherche sur les Maladies Infectieuses Tropicales Emergentes (URMITE), IHU Méditerranée Infection, Assistance-Publique des Hôpitaux de Marseille, Aix-Marseille Université, CNRS 7278, IRD 198, INSERM1095, Marseille, France.
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Ramamurthy M, Sankar S, Kannangai R, Nandagopal B, Sridharan G. Application of viromics: a new approach to the understanding of viral infections in humans. Virusdisease 2017; 28:349-359. [PMID: 29291225 DOI: 10.1007/s13337-017-0415-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 11/17/2017] [Indexed: 12/19/2022] Open
Abstract
This review is focused at exploring the strengths of modern technology driven data compiled in the areas of virus gene sequencing, virus protein structures and their implication to viral diagnosis and therapy. The information for virome analysis (viromics) is generated by the study of viral genomes (entire nucleotide sequence) and viral genes (coding for protein). Presently, the study of viral infectious diseases in terms of etiopathogenesis and development of newer therapeutics is undergoing rapid changes. Currently, viromics relies on deep sequencing, next generation sequencing (NGS) data and public domain databases like GenBank and unique virus specific databases. Two commonly used NGS platforms: Illumina and Ion Torrent, recommend maximum fragment lengths of about 300 and 400 nucleotides for analysis respectively. Direct detection of viruses in clinical samples is now evolving using these methods. Presently, there are a considerable number of good treatment options for HBV/HIV/HCV. These viruses however show development of drug resistance. The drug susceptibility regions of the genomes are sequenced and the prediction of drug resistance is now possible from 3 public domains available on the web. This has been made possible through advances in the technology with the advent of high throughput sequencing and meta-analysis through sophisticated and easy to use software and the use of high speed computers for bioinformatics. More recently NGS technology has been improved with single-molecule real-time sequencing. Here complete long reads can be obtained with less error overcoming a limitation of the NGS which is inherently prone to software anomalies that arise in the hands of personnel without adequate training. The development in understanding the viruses in terms of their genome, pathobiology, transcriptomics and molecular epidemiology constitutes viromics. It could be stated that these developments will bring about radical changes and advancement especially in the field of antiviral therapy and diagnostic virology.
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Affiliation(s)
- Mageshbabu Ramamurthy
- Sri Sakthi Amma Institute of Biomedical Research, Sri Narayani Hospital and Research Centre, Sripuram, Vellore, Tamil Nadu 632 055 India
| | - Sathish Sankar
- Sri Sakthi Amma Institute of Biomedical Research, Sri Narayani Hospital and Research Centre, Sripuram, Vellore, Tamil Nadu 632 055 India
| | - Rajesh Kannangai
- Department of Clinical Virology, Christian Medical College and Hospital, Vellore, Tamil Nadu 632 004 India
| | - Balaji Nandagopal
- Sri Sakthi Amma Institute of Biomedical Research, Sri Narayani Hospital and Research Centre, Sripuram, Vellore, Tamil Nadu 632 055 India
| | - Gopalan Sridharan
- Sri Sakthi Amma Institute of Biomedical Research, Sri Narayani Hospital and Research Centre, Sripuram, Vellore, Tamil Nadu 632 055 India
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76
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Zárate S, Taboada B, Yocupicio-Monroy M, Arias CF. Human Virome. Arch Med Res 2017; 48:701-716. [DOI: 10.1016/j.arcmed.2018.01.005] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 01/22/2018] [Indexed: 12/16/2022]
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77
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Fujii H, Kakiuchi S, Tsuji M, Nishimura H, Yoshikawa T, Yamada S, Omura N, Inagaki T, Shibamura M, Harada S, Taniguchi S, Saijo M. Application of next-generation sequencing to detect acyclovir-resistant herpes simplex virus type 1 variants at low frequency in thymidine kinase gene of the isolates recovered from patients with hematopoietic stem cell transplantation. J Virol Methods 2017; 251:123-128. [PMID: 29074089 DOI: 10.1016/j.jviromet.2017.10.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 10/17/2017] [Accepted: 10/20/2017] [Indexed: 12/25/2022]
Abstract
Ion Torrent next-generation sequencing (NGS) technology was applied to study the mode of emergence of acyclovir (ACV)-resistant (ACVr) herpes simplex virus type 1 (HSV-1) in patients with hematopoietic stem cell transplantation (HSCT) by quantitatively detecting mutations in the viral thymidine kinase (vTK) gene in the HSV-1 isolates recovered from HSCT patients. All of the mutations detected with the Sanger sequencing method in the vTK genes of HSV-1 isolates were also detected with the NGS assay. Furthermore, different mutations, which conferred ACV resistance and were not detected with the Sanger sequencing method, were also detected in a quantitative manner by using the NGS assay. The approach described here is applicable to studying the emergence process of vTK gene mutation-associated ACVr HSV-1 more in detail than the Sanger method. The NGS assay makes it possible to make a diagnosis of vTK gene mutation-associated ACVr HSV-1 infections at the early stage, which the ratio of ACVr HSV-1 is much lower than that of ACV-sensitive (ACVs) HSV-1.
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Affiliation(s)
- Hikaru Fujii
- Department of Virology I, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Satsuki Kakiuchi
- Department of Pediatrics, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Masanori Tsuji
- Department of Hematology, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo, 105-8470, Japan
| | - Hidekazu Nishimura
- Virus Research Center, Sendai Medical Center, 2-8-8 Miyagino, Miyagino-ku, Sendai-shi, Miyagi, 983-8520, Japan
| | - Tomoki Yoshikawa
- Department of Virology I, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Souichi Yamada
- Department of Virology I, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Natsumi Omura
- Department of Virology I, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan; Department of Life Science and Medical Bioscience, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, Japan
| | - Takuya Inagaki
- Department of Virology I, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan; Department of Life Science and Medical Bioscience, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, Japan
| | - Miho Shibamura
- Department of Virology I, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan; Department of Pediatrics, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - Shizuko Harada
- Department of Virology I, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan
| | - Shuichi Taniguchi
- Department of Hematology, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo, 105-8470, Japan
| | - Masayuki Saijo
- Department of Virology I, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan.
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78
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Sekse C, Holst-Jensen A, Dobrindt U, Johannessen GS, Li W, Spilsberg B, Shi J. High Throughput Sequencing for Detection of Foodborne Pathogens. Front Microbiol 2017; 8:2029. [PMID: 29104564 PMCID: PMC5655695 DOI: 10.3389/fmicb.2017.02029] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 10/04/2017] [Indexed: 12/23/2022] Open
Abstract
High-throughput sequencing (HTS) is becoming the state-of-the-art technology for typing of microbial isolates, especially in clinical samples. Yet, its application is still in its infancy for monitoring and outbreak investigations of foods. Here we review the published literature, covering not only bacterial but also viral and Eukaryote food pathogens, to assess the status and potential of HTS implementation to inform stakeholders, improve food safety and reduce outbreak impacts. The developments in sequencing technology and bioinformatics have outpaced the capacity to analyze and interpret the sequence data. The influence of sample processing, nucleic acid extraction and purification, harmonized protocols for generation and interpretation of data, and properly annotated and curated reference databases including non-pathogenic "natural" strains are other major obstacles to the realization of the full potential of HTS in analytical food surveillance, epidemiological and outbreak investigations, and in complementing preventive approaches for the control and management of foodborne pathogens. Despite significant obstacles, the achieved progress in capacity and broadening of the application range over the last decade is impressive and unprecedented, as illustrated with the chosen examples from the literature. Large consortia, often with broad international participation, are making coordinated efforts to cope with many of the mentioned obstacles. Further rapid progress can therefore be prospected for the next decade.
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Affiliation(s)
- Camilla Sekse
- Department of Animal Health and Food Safety, Norwegian Veterinary Institute, Oslo, Norway
| | - Arne Holst-Jensen
- Department of Animal Health and Food Safety, Norwegian Veterinary Institute, Oslo, Norway
| | - Ulrich Dobrindt
- Institute of Hygiene, University of Münster, Münster, Germany
| | - Gro S. Johannessen
- Department of Animal Health and Food Safety, Norwegian Veterinary Institute, Oslo, Norway
| | - Weihua Li
- Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai Jiao Tong University–University of Adelaide Joint Centre for Agriculture and Health, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Bjørn Spilsberg
- Department of Analysis and Diagnostics, Norwegian Veterinary Institute, Oslo, Norway
| | - Jianxin Shi
- Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai Jiao Tong University–University of Adelaide Joint Centre for Agriculture and Health, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
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79
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Abstract
Computer-assisted technologies of the genomic structure, biological function, and evolution of viruses remain a largely neglected area of research. The attention of bioinformaticians to this challenging field is currently unsatisfying in respect to its medical and biological importance. The power of new genome sequencing technologies, associated with new tools to handle "big data", provides unprecedented opportunities to address fundamental questions in virology. Here, we present an overview of the current technologies, challenges, and advantages of Next-Generation Sequencing (NGS) in relation to the field of virology. We present how viral sequences can be detected de novo out of current short-read NGS data. Furthermore, we discuss the challenges and applications of viral quasispecies and how secondary structures, commonly shaped by RNA viruses, can be computationally predicted. The phylogenetic analysis of viruses, as another ubiquitous field in virology, forms an essential element of describing viral epidemics and challenges current algorithms. Recently, the first specialized virus-bioinformatic organizations have been established. We need to bring together virologists and bioinformaticians and provide a platform for the implementation of interdisciplinary collaborative projects at local and international scales. Above all, there is an urgent need for dedicated software tools to tackle various challenges in virology.
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Affiliation(s)
- Martin Hölzer
- RNA Bioinformatics and High Throughput Analysis, Faculty of Mathematics and Computer Science, Friedrich Schiller University Jena, Jena, Germany; European Virus Bioinformatics Center (EVBC), Jena, Germany
| | - Manja Marz
- RNA Bioinformatics and High Throughput Analysis, Faculty of Mathematics and Computer Science, Friedrich Schiller University Jena, Jena, Germany; European Virus Bioinformatics Center (EVBC), Jena, Germany; FLI Leibniz Institute for Age Research, Jena, Germany.
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80
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Batovska J, Lynch SE, Rodoni BC, Sawbridge TI, Cogan NO. Metagenomic arbovirus detection using MinION nanopore sequencing. J Virol Methods 2017; 249:79-84. [PMID: 28855093 DOI: 10.1016/j.jviromet.2017.08.019] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 08/22/2017] [Accepted: 08/23/2017] [Indexed: 11/26/2022]
Abstract
With its small size and low cost, the hand-held MinION sequencer is a powerful tool for in-field surveillance. Using a metagenomic approach, it allows non-targeted detection of viruses in a sample within a few hours. This study aimed to determine the ability of the MinION to metagenomically detect and characterise a virus from an infected mosquito. RNA was extracted from an Aedes notoscriptus mosquito infected with Ross River virus (RRV), converted into cDNA and sequenced on the MinION. Bioinformatic analysis of the MinION reads led to detection of full-length RRV, with reads of up to 2.5kb contributing to the assembly. The cDNA was also sequenced on the MiSeq sequencer, and both platforms recovered the RRV genome with >98% accuracy. This proof of concept study demonstrates the metagenomic detection of an arbovirus, using the MinION, directly from a mosquito with minimal sample purification.
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Affiliation(s)
- Jana Batovska
- Agriculture Victoria Research, AgriBio Centre for AgriBioscience, 5 Ring Road, Bundoora, Victoria, 3083, Australia; School of Applied Systems Biology, La Trobe University, Bundoora, Victoria, 3086, Australia.
| | - Stacey E Lynch
- Agriculture Victoria Research, AgriBio Centre for AgriBioscience, 5 Ring Road, Bundoora, Victoria, 3083, Australia.
| | - Brendan C Rodoni
- Agriculture Victoria Research, AgriBio Centre for AgriBioscience, 5 Ring Road, Bundoora, Victoria, 3083, Australia; School of Applied Systems Biology, La Trobe University, Bundoora, Victoria, 3086, Australia.
| | - Tim I Sawbridge
- Agriculture Victoria Research, AgriBio Centre for AgriBioscience, 5 Ring Road, Bundoora, Victoria, 3083, Australia; School of Applied Systems Biology, La Trobe University, Bundoora, Victoria, 3086, Australia.
| | - Noel Oi Cogan
- Agriculture Victoria Research, AgriBio Centre for AgriBioscience, 5 Ring Road, Bundoora, Victoria, 3083, Australia; School of Applied Systems Biology, La Trobe University, Bundoora, Victoria, 3086, Australia.
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81
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Calling Chromosome Alterations, DNA Methylation Statuses, and Mutations in Tumors by Simple Targeted Next-Generation Sequencing. J Mol Diagn 2017; 19:776-787. [DOI: 10.1016/j.jmoldx.2017.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 06/01/2017] [Indexed: 12/16/2022] Open
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82
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Song L, Huang W, Kang J, Huang Y, Ren H, Ding K. Comparison of error correction algorithms for Ion Torrent PGM data: application to hepatitis B virus. Sci Rep 2017; 7:8106. [PMID: 28808243 PMCID: PMC5556038 DOI: 10.1038/s41598-017-08139-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 07/05/2017] [Indexed: 01/26/2023] Open
Abstract
Ion Torrent Personal Genome Machine (PGM) technology is a mid-length read, low-cost and high-speed next-generation sequencing platform with a relatively high insertion and deletion (indel) error rate. A full systematic assessment of the effectiveness of various error correction algorithms in PGM viral datasets (e.g., hepatitis B virus (HBV)) has not been performed. We examined 19 quality-trimmed PGM datasets for the HBV reverse transcriptase (RT) region and found a total error rate of 0.48% ± 0.12%. Deletion errors were clearly present at the ends of homopolymer runs. Tests using both real and simulated data showed that the algorithms differed in their abilities to detect and correct errors and that the error rate and sequencing depth significantly affected the performance. Of the algorithms tested, Pollux showed a better overall performance but tended to over-correct 'genuine' substitution variants, whereas Fiona proved to be better at distinguishing these variants from sequencing errors. We found that the combined use of Pollux and Fiona gave the best results when error-correcting Ion Torrent PGM viral data.
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Affiliation(s)
- Liting Song
- Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), Institute for Viral Hepatitis, Department of Infectious Diseases, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400010, P.R. China
| | - Wenxun Huang
- Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), Institute for Viral Hepatitis, Department of Infectious Diseases, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400010, P.R. China
| | - Juan Kang
- Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), Institute for Viral Hepatitis, Department of Infectious Diseases, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400010, P.R. China
| | - Yuan Huang
- Center for Hepatobillary and Pancreatic Diseases, Beijing Tsinghua Changgung Hospital, Medical Center, Tsinghua University, Beijing, 100044, P.R. China
| | - Hong Ren
- Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), Institute for Viral Hepatitis, Department of Infectious Diseases, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400010, P.R. China
| | - Keyue Ding
- Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), Institute for Viral Hepatitis, Department of Infectious Diseases, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, 400010, P.R. China.
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83
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Rott M, Xiang Y, Boyes I, Belton M, Saeed H, Kesanakurti P, Hayes S, Lawrence T, Birch C, Bhagwat B, Rast H. Application of Next Generation Sequencing for Diagnostic Testing of Tree Fruit Viruses and Viroids. PLANT DISEASE 2017; 101:1489-1499. [PMID: 30678581 DOI: 10.1094/pdis-03-17-0306-re] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Conventional detection of viruses and virus-like diseases of plants is accomplished using a combination of molecular, serological, and biological indexing. These are the primary tools used by plant virologists to monitor and ensure trees are free of known viral pathogens. The biological indexing assay, or bioassay, is considered to be the "gold standard" as it is the only method of the three that can detect new, uncharacterized, or poorly characterized viral disease agents. Unfortunately, this method is also the most labor intensive and can take up to three years to complete. Next generation sequencing (NGS) is a technology with rapidly expanding possibilities including potential applications for the detection of plant viruses. In this study, comparisons are made between tree fruit testing by conventional and NGS methods, to demonstrate the efficacy of NGS. A comparison of 178 infected trees, many infected with several viral pathogens, demonstrated that conventional and NGS were equally capable of detecting known viruses and viroids. Comparable results were obtained for 170 of 178 of the specimens. Of the remaining eight specimens, some discrepancies were observed between viruses detected by the two methods, representing less than 5% of the specimens. NGS was further demonstrated to be equal or superior for the detection of new or poorly characterized viruses when compared with a conventional bioassay. These results validated both the effectiveness of conventional virus testing methods and the use of NGS as an additional or alternative method for plant virus detection.
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Affiliation(s)
- M Rott
- Centre for Plant Health, Sidney Laboratory, Canadian Food Inspection Agency, North Saanich, BC, V8L 1H3, Canada
| | - Y Xiang
- Summerland Research and Development Centre, Agriculture and Agri-Food Canada, Summerland, BC, V0H1Z0, Canada
| | - I Boyes
- Centre for Plant Health, Sidney Laboratory, Canadian Food Inspection Agency, North Saanich, BC, V8L 1H3, Canada
| | - M Belton
- Centre for Plant Health, Sidney Laboratory, Canadian Food Inspection Agency, North Saanich, BC, V8L 1H3, Canada
| | - H Saeed
- Centre for Plant Health, Sidney Laboratory, Canadian Food Inspection Agency, North Saanich, BC, V8L 1H3, Canada
| | - P Kesanakurti
- Centre for Plant Health, Sidney Laboratory, Canadian Food Inspection Agency, North Saanich, BC, V8L 1H3, Canada
| | - S Hayes
- Centre for Plant Health, Sidney Laboratory, Canadian Food Inspection Agency, North Saanich, BC, V8L 1H3, Canada
| | - T Lawrence
- Centre for Plant Health, Sidney Laboratory, Canadian Food Inspection Agency, North Saanich, BC, V8L 1H3, Canada
| | - C Birch
- Centre for Plant Health, Sidney Laboratory, Canadian Food Inspection Agency, North Saanich, BC, V8L 1H3, Canada
| | - B Bhagwat
- Summerland Research and Development Centre, Agriculture and Agri-Food Canada, Summerland, BC, V0H1Z0, Canada
| | - H Rast
- Centre for Plant Health, Sidney Laboratory, Canadian Food Inspection Agency, North Saanich, BC, V8L 1H3, Canada
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84
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Complete genome sequence of Ostreid herpesvirus type 1 µVar isolated during mortality events in the Pacific oyster Crassostrea gigas in France and Ireland. Virology 2017; 509:239-251. [PMID: 28672223 DOI: 10.1016/j.virol.2017.06.027] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 06/14/2017] [Accepted: 06/23/2017] [Indexed: 12/13/2022]
Abstract
Infections with Ostreid herpesvirus 1 (OsHV-1) microvariants in young Pacific oysters are associated with massive mortality events and significant economic losses. Previous studies, focusing on few regions of the genome, have revealed the genomic diversity of these genotypes with respect to the reference type. We used a NGS process to sequence the whole genome of the OsHV-1 µVar in infected individuals, collected during mortality events in France and Ireland. The final genome length of OsHV-1 µVar was approximately 205kbp, shorter than the reference genotype and the overall genome organisation resembled herpes simplex viruses. 94.4% similarity was observed with the OsHV-1 reference genotype. Large indels, including five deletions and three insertions were found to induce the loss and the addition of several ORFs, summed with codon substitutions in 64% of genes shared with the reference type. This diversity raises the question of the exact origin and evolution of OsHV-1 µVar.
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85
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Kujiraoka M, Kuroda M, Asai K, Sekizuka T, Kato K, Watanabe M, Matsukiyo H, Saito T, Ishii T, Katada N, Saida Y, Kusachi S. Comprehensive Diagnosis of Bacterial Infection Associated with Acute Cholecystitis Using Metagenomic Approach. Front Microbiol 2017; 8:685. [PMID: 28473817 PMCID: PMC5397476 DOI: 10.3389/fmicb.2017.00685] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 04/04/2017] [Indexed: 12/16/2022] Open
Abstract
Acute cholecystitis (AC), which is strongly associated with retrograde bacterial infection, is an inflammatory disease that can be fatal if inappropriately treated. Currently, bacterial culture testing, which is basically recommended to detect the etiological agent, is a time-consuming (4–6 days), non-comprehensive approach. To rapidly detect a potential pathogen and predict its antimicrobial susceptibility, we undertook a metagenomic approach to characterize the bacterial infection associated with AC. Six patients (P1–P6) who underwent cholecystectomy for AC were enrolled in this study. Metagenome analysis demonstrated possible single or multiple bacterial infections in four patients (P1, P2, P3, and P4) with 24-h experimental procedures; in addition, the CTX-M extended-spectrum ß-lactamase (ESBL) gene was identified in two bile samples (P1 and P4). Further whole genome sequencing of Escherichia coli isolates suggested that CTX-M-27-producing ST131 and CTX-M-14-producing novel-ST were identified in P1 and P4, respectively. Metagenome analysis of feces and saliva also suggested some imbalance in the microbiota for more comprehensive assessment of patients with AC. In conclusion, metagenome analysis was useful for rapid bacterial diagnostics, including assessing potential antimicrobial susceptibility, in patients with AC.
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Affiliation(s)
- Manabu Kujiraoka
- Department of Surgery, Toho University Ohashi Medical CenterTokyo, Japan.,Laboratory of Bacterial Genomics, Pathogen Genomics Center, National Institute of Infectious DiseasesTokyo, Japan
| | - Makoto Kuroda
- Laboratory of Bacterial Genomics, Pathogen Genomics Center, National Institute of Infectious DiseasesTokyo, Japan
| | - Koji Asai
- Department of Surgery, Toho University Ohashi Medical CenterTokyo, Japan
| | - Tsuyoshi Sekizuka
- Laboratory of Bacterial Genomics, Pathogen Genomics Center, National Institute of Infectious DiseasesTokyo, Japan
| | - Kengo Kato
- Laboratory of Bacterial Genomics, Pathogen Genomics Center, National Institute of Infectious DiseasesTokyo, Japan
| | - Manabu Watanabe
- Department of Surgery, Toho University Ohashi Medical CenterTokyo, Japan
| | - Hiroshi Matsukiyo
- Department of Surgery, Toho University Ohashi Medical CenterTokyo, Japan
| | - Tomoaki Saito
- Department of Surgery, Toho University Ohashi Medical CenterTokyo, Japan
| | - Tomotaka Ishii
- Department of Surgery, Toho University Ohashi Medical CenterTokyo, Japan
| | - Natsuya Katada
- Department of Surgery, Toho University Ohashi Medical CenterTokyo, Japan
| | - Yoshihisa Saida
- Department of Surgery, Toho University Ohashi Medical CenterTokyo, Japan
| | - Shinya Kusachi
- Department of Surgery, Toho University Ohashi Medical CenterTokyo, Japan
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86
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Abstract
Hepatitis C virus (HCV) represents a significant global disease burden, with an estimated 130-150 million people worldwide living with chronic HCV infection. Within the six major clinical HCV genotypes, genotype 3 represents 22-30% of all infection and is described as a unique entity with higher rates of steatosis, faster progression to cirrhosis, and higher rates of hepatocellular carcinoma. Hepatic steatosis in the setting of hepatitis C genotype 3 (HCV-3) is driven by viral influence on three major pathways: microsomal triglyceride transfer protein, sterol regulatory element-binding protein-1c, and peroxisome proliferator-associated receptor-α. Historically with direct-acting antivirals, the rates of cure for HCV-3 therapies lagged behind the other genotypes. As current therapies for HCV-3 continue to close this gap, it is important to be cognizant of common drug interactions such as acid-suppressing medication and amiodarone. In this review, we discuss the rates of steatosis in HCV-3, the mechanisms behind HCV-3-specific steatosis, and current and future therapies.
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Affiliation(s)
- Austin Chan
- Division of Infectious Diseases, Department of Medicine, Duke University School of Medicine, Durham, NC, USA
- Infectious Diseases Research, Duke Clinical Research Institute, Durham, NC, USA
| | - Keyur Patel
- Toronto Center for Liver Disease, University of Toronto, Toronto, ON, Canada
| | - Susanna Naggie
- Division of Infectious Diseases, Department of Medicine, Duke University School of Medicine, Durham, NC, USA.
- Infectious Diseases Research, Duke Clinical Research Institute, Durham, NC, USA.
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87
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Shi Z, Wang LF. Evolution of SARS Coronavirus and the Relevance of Modern Molecular Epidemiology. GENETICS AND EVOLUTION OF INFECTIOUS DISEASES 2017. [PMCID: PMC7150232 DOI: 10.1016/b978-0-12-799942-5.00026-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The severe acute respiratory syndrome (SARS) is the first major zoonotic infectious disease of the 21st Century. The disease, originally termed “atypical pneumonia,” was first recognized in November 2002 in Guangdong Province, China, which spread rapidly to 26 countries within 5 months and eventually led to 8096 human infection cases and 774 deaths. A previously unrecognized coronavirus, named SARS coronavirus (SARS-CoV), was later identified as the causative agent of SARS. Subsequent investigation indicated that the source of the human infections originated most likely from infected wildlife animals traded in the live animal markets, with masked palm civets considered the most prominent and important carrier. Large-scale culling of civets appeared to be effective in preventing further outbreaks in the region. Subsequent epidemiological studies showed that civets are intermediate host of SARS-CoV and bats are the likely natural reservoir of SARS-CoV and a large number of SARS-like coronaviruses (SL-CoVs). Detailed analysis of the massive SARS-CoV genomic sequence data indicated that SARS-CoV experienced a strong selection pressure during different outbreak phases in humans as well as interspecies transmission from animals to humans. The spike glycoprotein (S) of SARS-CoV plays a key role in virus–host interaction and hence is a key determinant of interspecies transmission. It has been shown that minor changes of amino acid (aa) residues in the S protein could lead to dramatic changes in virus susceptibility in animal and human hosts. This chapter focuses on the genetics and evolution of SARS-CoVs and SL-CoVs in humans, civets, and bats. The events of SARS outbreaks and the accompanying response activities highlight the importance of modern molecular epidemiology in disease investigation and the urgent need to broaden the screening and investigation of unknown viruses in wildlife animals.
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88
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Rapid Metagenomic Next-Generation Sequencing during an Investigation of Hospital-Acquired Human Parainfluenza Virus 3 Infections. J Clin Microbiol 2016; 55:177-182. [PMID: 27795347 PMCID: PMC5228228 DOI: 10.1128/jcm.01881-16] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Accepted: 10/20/2016] [Indexed: 12/31/2022] Open
Abstract
Metagenomic next-generation sequencing (mNGS) is increasingly used for the unbiased detection of viruses, bacteria, fungi, and eukaryotic parasites in clinical samples. Whole-genome sequencing (WGS) of clinical bacterial isolates has been shown to inform hospital infection prevention practices, but this technology has not been utilized during potential respiratory virus outbreaks. Here, we report on the use of mNGS to inform the real-time infection prevention response to a cluster of hospital-acquired human parainfluenza 3 virus (HPIV3) infections at a children's hospital. Samples from 3 patients with hospital-acquired HPIV3 identified over a 12-day period on a general medical unit and 10 temporally associated samples from patients with community-acquired HPIV3 were analyzed. Our sample-to-sequencer time was <24 h, while our sample-to-answer turnaround time was <60 h with a hands-on time of approximately 6 h. Eight (2 cases and 6 controls) of 13 samples had sufficient sequencing coverage to yield the whole genome for HPIV3, while 10 (2 cases and 8 controls) of 13 samples gave partial genomes and all 13 samples had >1 read for HPIV3. Phylogenetic clustering revealed the presence of identical HPIV3 genomic sequence in the two of the cases with hospital-acquired infection, consistent with the concern for recent transmission within the medical unit. Adequate sequence coverage was not recovered for the third case. This work demonstrates the promise of mNGS for providing rapid information for infection prevention in addition to microbial detection.
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89
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Song DH, Kim WK, Gu SH, Lee D, Kim JA, No JS, Lee SH, Wiley MR, Palacios G, Song JW, Jeong ST. Sequence-Independent, Single-Primer Amplification Next-Generation Sequencing of Hantaan Virus Cell Culture-Based Isolates. Am J Trop Med Hyg 2016; 96:389-394. [PMID: 27895275 DOI: 10.4269/ajtmh.16-0683] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 10/16/2016] [Indexed: 01/11/2023] Open
Abstract
Hantaan virus (HTNV), identified in the striped field mouse (Apodemus agrarius), belongs to the genus Hantavirus of the family Bunyaviridae and contains tripartite RNA genomes, small (S), medium (M), and large (L) segments. HTNV is a major causative for hemorrhagic fever with renal syndrome (HFRS) with fatality rates ranging from 1% to 15% in the Republic of Korea (ROK) and China. Defining of HTNV whole-genome sequences and isolation of the infectious particle play a critical role in the characterization and preventive and therapeutic strategies of hantavirus outbreaks. Next-generation sequencing (NGS) provides an advanced tool for massive genomic sequencing of viruses. However, the isolation of viral infectious particles is a huge obstacle to investigate and develop anti-virals for hantaviruses. Here, we report 12 HTNV isolates from lung tissues of the striped field mouse in the highly HFRS-endemic areas. Sequence-independent, single-primer amplification (SISPA) NGS was attempted to recover the genomic sequences of HTNV isolates. The nucleotide sequence of HTNV S, M, and L segments were covered up to 99.4-100%, 97.5-100%, and 95.6-99.8%, respectively, based on the full length of the prototype HTNV 76-118. The whole-genome sequencing of HTNV isolates was accomplished by additional reverse transcription polymerase chain reaction (RT-PCR) and rapid amplification cDNA ends (RACE) PCR. In conclusion, this study will lead to the attempt and usage of SISPA NGS technologies to delineate the whole-genome sequence of hantaviruses, providing a new era of viral genomics for the surveillance, trace, and disease risk management of HFRS incidents.
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Affiliation(s)
- Dong Hyun Song
- The 5th R&D Institute, Agency for Defense Development, Daejeon, Republic of Korea
| | - Won-Keun Kim
- Department of Microbiology, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Se Hun Gu
- The 5th R&D Institute, Agency for Defense Development, Daejeon, Republic of Korea
| | - Daesang Lee
- The 5th R&D Institute, Agency for Defense Development, Daejeon, Republic of Korea
| | - Jeong-Ah Kim
- Department of Microbiology, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Jin Sun No
- Department of Microbiology, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Seung-Ho Lee
- Department of Microbiology, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Michael R Wiley
- The Center for Genome Science, U.S. Army Medical Research Institute of Infectious Disease, Fort Detrick, Maryland
| | - Gustavo Palacios
- The Center for Genome Science, U.S. Army Medical Research Institute of Infectious Disease, Fort Detrick, Maryland
| | - Jin-Won Song
- Department of Microbiology, College of Medicine, Korea University, Seoul, Republic of Korea.
| | - Seong Tae Jeong
- The 5th R&D Institute, Agency for Defense Development, Daejeon, Republic of Korea.
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90
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Pearson VM, Caudle SB, Rokyta DR. Viral recombination blurs taxonomic lines: examination of single-stranded DNA viruses in a wastewater treatment plant. PeerJ 2016; 4:e2585. [PMID: 27781171 PMCID: PMC5075696 DOI: 10.7717/peerj.2585] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 09/19/2016] [Indexed: 12/26/2022] Open
Abstract
Understanding the structure and dynamics of microbial communities, especially those of economic concern, is of paramount importance to maintaining healthy and efficient microbial communities at agricultural sites and large industrial cultures, including bioprocessors. Wastewater treatment plants are large bioprocessors which receive water from multiple sources, becoming reservoirs for the collection of many viral families that infect a broad range of hosts. To examine this complex collection of viruses, full-length genomes of circular ssDNA viruses were isolated from a wastewater treatment facility using a combination of sucrose-gradient size selection and rolling-circle amplification and sequenced on an Illumina MiSeq. Single-stranded DNA viruses are among the least understood groups of microbial pathogens due to genomic biases and culturing difficulties, particularly compared to the larger, more often studied dsDNA viruses. However, the group contains several notable well-studied examples, including agricultural pathogens which infect both livestock and crops (Circoviridae and Geminiviridae), and model organisms for genetics and evolution studies (Microviridae). Examination of the collected viral DNA provided evidence for 83 unique genotypic groupings, which were genetically dissimilar to known viral types and exhibited broad diversity within the community. Furthermore, although these genomes express similarities to known viral families, such as Circoviridae, Geminiviridae, and Microviridae, many are so divergent that they may represent new taxonomic groups. This study demonstrated the efficacy of the protocol for separating bacteria and large viruses from the sought after ssDNA viruses and the ability to use this protocol to obtain an in-depth analysis of the diversity within this group.
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Affiliation(s)
- Victoria M Pearson
- Department of Biological Science, Florida State University , Tallahassee , FL , USA
| | - S Brian Caudle
- Division of Food Safety, Florida Department of Agriculture and Consumer Services , Tallahassee , FL , USA
| | - Darin R Rokyta
- Department of Biological Science, Florida State University , Tallahassee , FL , USA
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91
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Ali R, Blackburn RM, Kozlakidis Z. Next-Generation Sequencing and Influenza Virus: A Short Review of the Published Implementation Attempts. HAYATI JOURNAL OF BIOSCIENCES 2016. [DOI: 10.1016/j.hjb.2016.12.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/09/2022] Open
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92
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Okamatsu M, Hiono T, Kida H, Sakoda Y. Recent developments in the diagnosis of avian influenza. Vet J 2016; 215:82-6. [DOI: 10.1016/j.tvjl.2016.05.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2015] [Revised: 04/25/2016] [Accepted: 05/12/2016] [Indexed: 01/27/2023]
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93
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Marascio N, Pavia G, Strazzulla A, Dierckx T, Cuypers L, Vrancken B, Barreca GS, Mirante T, Malanga D, Oliveira DM, Vandamme AM, Torti C, Liberto MC, Focà A. Detection of Natural Resistance-Associated Substitutions by Ion Semiconductor Technology in HCV1b Positive, Direct-Acting Antiviral Agents-Naïve Patients. Int J Mol Sci 2016; 17:E1416. [PMID: 27618896 PMCID: PMC5037695 DOI: 10.3390/ijms17091416] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 08/17/2016] [Accepted: 08/22/2016] [Indexed: 12/18/2022] Open
Abstract
Naturally occurring resistance-associated substitutions (RASs) can negatively impact the response to direct-acting antivirals (DAAs) agents-based therapies for hepatitis C virus (HCV) infection. Herein, we set out to characterize the RASs in the HCV1b genome from serum samples of DAA-naïve patients in the context of the SINERGIE (South Italian Network for Rational Guidelines and International Epidemiology, 2014) project. We deep-sequenced the NS3/4A protease region of the viral population using the Ion Torrent Personal Genome Machine, and patient-specific majority rule consensus sequence summaries were constructed with a combination of freely available next generation sequencing data analysis software. We detected NS3/4A protease major and minor variants associated with resistance to boceprevir (V36L), telaprevir (V36L, I132V), simeprevir (V36L), and grazoprevir (V36L, V170I). Furthermore, we sequenced part of HCV NS5B polymerase using Sanger-sequencing and detected a natural RAS for dasabuvir (C316N). This mutation could be important for treatment strategies in cases of previous therapy failure.
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Affiliation(s)
- Nadia Marascio
- Department of Health Sciences, Institute of Microbiology, School of Medicine, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
- Katholieke Universiteit (KU) Leuven-University of Leuven, Department of Microbiology and Immunology, Rega Institute for Medical Research, Clinical and Epidemiological Virology, 3000 Leuven, Belgium.
| | - Grazia Pavia
- Department of Health Sciences, Institute of Microbiology, School of Medicine, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
| | - Alessio Strazzulla
- Department of Medical and Surgical Sciences, Unit of Infectious and Tropical Diseases, School of Medicine, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
| | - Tim Dierckx
- Katholieke Universiteit (KU) Leuven-University of Leuven, Department of Microbiology and Immunology, Rega Institute for Medical Research, Clinical and Epidemiological Virology, 3000 Leuven, Belgium.
| | - Lize Cuypers
- Katholieke Universiteit (KU) Leuven-University of Leuven, Department of Microbiology and Immunology, Rega Institute for Medical Research, Clinical and Epidemiological Virology, 3000 Leuven, Belgium.
| | - Bram Vrancken
- Katholieke Universiteit (KU) Leuven-University of Leuven, Department of Microbiology and Immunology, Rega Institute for Medical Research, Clinical and Epidemiological Virology, 3000 Leuven, Belgium.
| | - Giorgio Settimo Barreca
- Department of Health Sciences, Institute of Microbiology, School of Medicine, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
| | - Teresa Mirante
- Centro di Servizio Interdipartimentale (CIS)-Genomica funzionale e Patologia Molecolare, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
| | - Donatella Malanga
- Department of Experimental and Clinical Medicine, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
| | - Duarte Mendes Oliveira
- Department of Experimental and Clinical Medicine, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
| | - Anne-Mieke Vandamme
- Katholieke Universiteit (KU) Leuven-University of Leuven, Department of Microbiology and Immunology, Rega Institute for Medical Research, Clinical and Epidemiological Virology, 3000 Leuven, Belgium.
- Center for Global Health and Tropical Medicine, Institute for Hygiene and Tropical Medicine, University Nova de Lisboa, Rua da Junqueira 100, 1349-008 Lisbon, Portugal.
| | - Carlo Torti
- Department of Medical and Surgical Sciences, Unit of Infectious and Tropical Diseases, School of Medicine, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
| | - Maria Carla Liberto
- Department of Health Sciences, Institute of Microbiology, School of Medicine, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
| | - Alfredo Focà
- Department of Health Sciences, Institute of Microbiology, School of Medicine, University of Magna Graecia, Viale Europa, Germaneto, 88100 Catanzaro, Italy.
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94
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Lavezzo E, Barzon L, Toppo S, Palù G. Third generation sequencing technologies applied to diagnostic microbiology: benefits and challenges in applications and data analysis. Expert Rev Mol Diagn 2016; 16:1011-23. [PMID: 27453996 DOI: 10.1080/14737159.2016.1217158] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
INTRODUCTION The diagnosis of infectious diseases is among the most successful areas of application of new generation sequencing technologies. The field has seen the development of numerous experimental and analytical approaches for the detection and the fine description of pathogenic and non-pathogenic microorganisms. AREAS COVERED Without claiming to be exhaustive with respect to all applications and methods developed over the years, this review focuses on the advantages and the issues brought by the new technologies, with an eye in particular to third generation sequencing methods. Both experimental procedures and algorithmic strategies are presented, following the most relevant publications which have led to progress in our ability of detecting infectious agents. Expert commentary: The technical advance brought by third generation sequencing platforms has the potential to significantly expand the range of diagnostic tools that will be available to clinicians. Nonetheless, the implementation of these technologies in clinical practice is still far from being actionable and will temporally follow the path undertaken by second generation methods, which still require the setup of standardized pipelines in both wet and dry laboratory procedures.
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Affiliation(s)
- Enrico Lavezzo
- a Department of Molecular Medicine , University of Padova , Padova , Italy
| | - Luisa Barzon
- a Department of Molecular Medicine , University of Padova , Padova , Italy
| | - Stefano Toppo
- a Department of Molecular Medicine , University of Padova , Padova , Italy
| | - Giorgio Palù
- a Department of Molecular Medicine , University of Padova , Padova , Italy
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95
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Screening for plant viruses by next generation sequencing using a modified double strand RNA extraction protocol with an internal amplification control. J Virol Methods 2016; 236:35-40. [PMID: 27387642 DOI: 10.1016/j.jviromet.2016.07.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 05/30/2016] [Accepted: 07/03/2016] [Indexed: 11/21/2022]
Abstract
The majority of plant viruses contain RNA genomes. Detection of viral RNA genomes in infected plant material by next generation sequencing (NGS) is possible through the extraction and sequencing of total RNA, total RNA devoid of ribosomal RNA, small RNA interference (RNAi) molecules, or double stranded RNA (dsRNA). Plants do not typically produce high molecular weight dsRNA, therefore the presence of dsRNA makes it an attractive target for plant virus diagnostics. The sensitivity of NGS as a diagnostic method demands an effective dsRNA protocol that is both representative of the sample and minimizes sample cross contamination. We have developed a modified dsRNA extraction protocol that is more efficient compared to traditional protocols, requiring reduced amounts of starting material, that is less prone to sample cross contamination. This was accomplished by using bead based homogenization of plant material in closed, disposable 50ml tubes. To assess the quality of extraction, we also developed an internal control by designing a real-time (quantitative) PCR (qPCR) assay that targets endornaviruses present in Phaseolus vulgaris cultivar Black Turtle Soup (BTS).
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96
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Zhou Y, Fernandez S, Yoon IK, Simasathien S, Watanaveeradej V, Yang Y, Marte-Salcedo OA, Shuck-Lee DJ, Thomas SJ, Hang J, Jarman RG. Metagenomics Study of Viral Pathogens in Undiagnosed Respiratory Specimens and Identification of Human Enteroviruses at a Thailand Hospital. Am J Trop Med Hyg 2016; 95:663-669. [PMID: 27352877 PMCID: PMC5014275 DOI: 10.4269/ajtmh.16-0062] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 05/12/2016] [Indexed: 12/11/2022] Open
Abstract
Numerous pathogens cause respiratory infections with similar symptoms. Routine diagnostics detect only a limited number of pathogens, leaving a gap in respiratory illness etiology surveillance. This study evaluated next-generation sequencing for unbiased pathogen identification. Respiratory samples collected in Thailand, Philippines, Bhutan, and Nepal, that were negative by several molecular and immunofluorescence assays, underwent viral cultivation. Samples which demonstrated cytopathic effect in culture (N = 121) were extracted and tested by Luminex xTAG respiratory viral panel (RVP) assay and deep sequencing by Roche 454 FLX Titanium system. Using RVP assay, 52 (43%) samples were positive for enterovirus or rhinovirus and another three were positive for respiratory syncytial virus B, parainfluenza 4, and adenovirus. Deep sequencing confirmed the Luminex assay results and identified additional viral pathogens. Human enteroviruses, including Enterovirus A type 71 and 12 types of Enterovirus B (EV-B) were identified from a hospital in Bangkok. Phylogenetic and recombination analysis showed high correlation of VP1 gene-based phylogeny with genome-wide phylogeny and the frequent genetic exchange among EV-B viruses. The high number and diversity of enteroviruses in the hospital in Bangkok suggests prevalent existence. The metagenomic approach used in our study enabled comprehensive diagnoses of respiratory viruses.
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Affiliation(s)
- Yanfei Zhou
- Viral Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland
| | - Stefan Fernandez
- Department of Virology, U.S. Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - In-Kyu Yoon
- International Vaccine Institute, Seoul, Republic of Korea.,Department of Virology, U.S. Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | | | | | - Yu Yang
- Viral Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland
| | - Omely A Marte-Salcedo
- Viral Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland
| | - Deidra J Shuck-Lee
- Viral Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland
| | - Stephen J Thomas
- Viral Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland
| | - Jun Hang
- Viral Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland
| | - Richard G Jarman
- Viral Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland
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97
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Paraskevis D, Nikolopoulos GK, Magiorkinis G, Hodges-Mameletzis I, Hatzakis A. The application of HIV molecular epidemiology to public health. INFECTION GENETICS AND EVOLUTION 2016; 46:159-168. [PMID: 27312102 DOI: 10.1016/j.meegid.2016.06.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 06/06/2016] [Accepted: 06/07/2016] [Indexed: 02/02/2023]
Abstract
HIV is responsible for one of the largest viral pandemics in human history. Despite a concerted global response for prevention and treatment, the virus persists. Thus, urgent public health action, utilizing novel interventions, is needed to prevent future transmission events, critical to eliminating HIV. For public health planning to prove effective and successful, we need to understand the dynamics of regional epidemics and to intervene appropriately. HIV molecular epidemiology tools as implemented in phylogenetic, phylodynamic and phylogeographic analyses have proven to be powerful tools in public health planning across many studies. Numerous applications with HIV suggest that molecular methods alone or in combination with mathematical modelling can provide inferences about the transmission dynamics, critical epidemiological parameters (prevalence, incidence, effective number of infections, Re, generation times, time between infection and diagnosis), or the spatiotemporal characteristics of epidemics. Molecular tools have been used to assess the impact of an intervention and outbreak investigation which are of great public health relevance. In some settings, molecular sequence data may be more readily available than HIV surveillance data, and can therefore allow for molecular analyses to be conducted more easily. Nonetheless, classic methods have an integral role in monitoring and evaluation of public health programmes, and should supplement emerging techniques from the field of molecular epidemiology. Importantly, molecular epidemiology remains a promising approach in responding to viral diseases.
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Affiliation(s)
- D Paraskevis
- Department of Hygiene Epidemiology and Medical Statistics, Medical School, National and Kapodistrian University of Athens, Athens, Greece.
| | - G K Nikolopoulos
- Hellenic Center for Diseases Control and Prevention, Maroussi, Greece
| | - G Magiorkinis
- Department of Hygiene Epidemiology and Medical Statistics, Medical School, National and Kapodistrian University of Athens, Athens, Greece; Department of Zoology, University of Oxford, South Parks Road, OX1 3PS, Oxford, United Kingdom
| | | | - A Hatzakis
- Hellenic Center for Diseases Control and Prevention, Maroussi, Greece
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98
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Salzberg SL, Breitwieser FP, Kumar A, Hao H, Burger P, Rodriguez FJ, Lim M, Quiñones-Hinojosa A, Gallia GL, Tornheim JA, Melia MT, Sears CL, Pardo CA. Next-generation sequencing in neuropathologic diagnosis of infections of the nervous system. NEUROLOGY-NEUROIMMUNOLOGY & NEUROINFLAMMATION 2016; 3:e251. [PMID: 27340685 PMCID: PMC4907805 DOI: 10.1212/nxi.0000000000000251] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 05/09/2016] [Indexed: 12/13/2022]
Abstract
Objective: To determine the feasibility of next-generation sequencing (NGS) microbiome approaches in the diagnosis of infectious disorders in brain or spinal cord biopsies in patients with suspected CNS infections. Methods: In a prospective pilot study, we applied NGS in combination with a new computational analysis pipeline to detect the presence of pathogenic microbes in brain or spinal cord biopsies from 10 patients with neurologic problems indicating possible infection but for whom conventional clinical and microbiology studies yielded negative or inconclusive results. Results: Direct DNA and RNA sequencing of brain tissue biopsies generated 8.3 million to 29.1 million sequence reads per sample, which successfully identified with high confidence the infectious agent in 3 patients for whom validation techniques confirmed the pathogens identified by NGS. Although NGS was unable to identify with precision infectious agents in the remaining cases, it contributed to the understanding of neuropathologic processes in 5 others, demonstrating the power of large-scale unbiased sequencing as a novel diagnostic tool. Clinical outcomes were consistent with the findings yielded by NGS on the presence or absence of an infectious pathogenic process in 8 of 10 cases, and were noncontributory in the remaining 2. Conclusions: NGS-guided metagenomic studies of brain, spinal cord, or meningeal biopsies offer the possibility for dramatic improvements in our ability to detect (or rule out) a wide range of CNS pathogens, with potential benefits in speed, sensitivity, and cost. NGS-based microbiome approaches present a major new opportunity to investigate the potential role of infectious pathogens in the pathogenesis of neuroinflammatory disorders.
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Affiliation(s)
- Steven L Salzberg
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Florian P Breitwieser
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Anupama Kumar
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Haiping Hao
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Peter Burger
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Fausto J Rodriguez
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Michael Lim
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Alfredo Quiñones-Hinojosa
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Gary L Gallia
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Jeffrey A Tornheim
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Michael T Melia
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Cynthia L Sears
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
| | - Carlos A Pardo
- Center for Computational Biology, McKusick-Nathans Institute of Genetic Medicine (S.L.S., F.P.B.), Department of Neurology (A.K., C.A.P.), Deep Sequencing and Microarray Core (H.H.), and Departments of Pathology (P.B., F.J.R., C.A.P.), Neurosurgery (M.L., A.Q.-H., G.L.G.), and Medicine (J.A.T., M.T.M., C.L.S.), School of Medicine, and Departments of Biomedical Engineering, Computer Science, and Biostatistics (S.L.S.), Johns Hopkins University, Baltimore, MD
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99
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Abstract
Compared to classical epidemiologic methods, genomics can be used to precisely monitor virus evolution and transmission in real time across large, diverse populations. Integration of pathogen genomics with data about host genetics and global transcriptional responses to infection allows for comprehensive studies of population-level responses to infection and provides novel methods for predicting clinical outcomes. As genomic technologies become more accessible, these methods will redefine how emerging viruses are studied and outbreaks are contained. Here we review the existing and emerging genomic technologies that are enabling systems epidemiology and systems virology and making it possible to respond rapidly to emerging viruses such as Zika.
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Affiliation(s)
- Angela L Rasmussen
- Department of Microbiology, University of Washington, 960 Republican Street, Seattle, WA 98109, USA
| | - Michael G Katze
- Department of Microbiology, University of Washington, 960 Republican Street, Seattle, WA 98109, USA.
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100
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Fogell DJ, Martin RO, Groombridge JJ. Beak and feather disease virus in wild and captive parrots: an analysis of geographic and taxonomic distribution and methodological trends. Arch Virol 2016; 161:2059-74. [PMID: 27151279 PMCID: PMC4947100 DOI: 10.1007/s00705-016-2871-2] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Accepted: 04/24/2016] [Indexed: 01/15/2023]
Abstract
Psittacine beak and feather disease (PBFD) has emerged in recent years as a major threat to wild parrot populations and is an increasing concern to aviculturists and managers of captive populations. Pathological and serological tests for screening for the presence of beak and feather disease virus (BFDV) are a critical component of efforts to manage the disease and of epidemiological studies. Since the disease was first reported in the mid-1970s, screening for BFDV has been conducted in numerous wild and captive populations. However, at present, there is no current and readily accessible synthesis of screening efforts and their results. Here, we consolidate information collected from 83 PBFD- and BFDV-based publications on the primary screening methods being used and identify important knowledge gaps regarding potential global disease hotspots. We present trends in research intensity in this field and critically discuss advances in screening techniques and their applications to both aviculture and to the management of threatened wild populations. Finally, we provide an overview of estimates of BFDV prevalence in captive and wild flocks alongside a complete list of all psittacine species in which the virus has been confirmed. Our evaluation highlights the need for standardised diagnostic tests and more emphasis on studies of wild populations, particularly in view of the intrinsic connection between global trade in companion birds and the spread of novel BFDV strains into wild populations. Increased emphasis should be placed on the screening of captive and wild parrot populations within their countries of origin across the Americas, Africa and Asia.
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Affiliation(s)
- Deborah J Fogell
- Durrell Institute of Conservation and Ecology, University of Kent, Canterbury, CT2 7NZ, UK.
| | - Rowan O Martin
- World Parrot Trust, Glanmor House, Hayle, Cornwall, TR27 4HB, UK.,Percy FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, University of Cape Town, Cape Town, South Africa
| | - Jim J Groombridge
- Durrell Institute of Conservation and Ecology, University of Kent, Canterbury, CT2 7NZ, UK
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