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Demetriou VL, Kostrikis LG. Near-full genome characterization of unclassified hepatitis C virus strains relating to genotypes 1 and 4. J Med Virol 2012; 83:2119-27. [PMID: 22012719 DOI: 10.1002/jmv.22237] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Near-full genome sequences are presented in this report for the first time of unclassified HCV strains amplified using RT-PCR from plasma of patients living in Cyprus. One strain appears to be a unique genotype-1-like isolate, displaying closer phylogenetic relationship to genotype 1 strains than other genotypes. Two isolates representing an unclassified variant of genotype 4 were also amplified, cases of which have been found elsewhere in the world in patients of central African origin and could now be assigned provisionally as new subtype 4v. The near-full genome nucleotide sequences of unclassified HCV isolates provide reference sequences of variants unknown previously, and contribute to the publicly available HCV sequence data to be used for diagnosis or research.
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Nakano T, Lau GMG, Lau GML, Sugiyama M, Mizokami M. An updated analysis of hepatitis C virus genotypes and subtypes based on the complete coding region. Liver Int 2012; 32:339-45. [PMID: 22142261 DOI: 10.1111/j.1478-3231.2011.02684.x] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Accepted: 10/09/2011] [Indexed: 12/23/2022]
Abstract
BACKGROUND The hepatitis C virus (HCV) genomic database is expanding rapidly. AIMS There is a need to provide an updated phylogenetic tree analysis based on the complete coding region of HCV. METHODS All available HCV complete genome sequences in the HCV databases available through October 2010 were analyzed. RESULTS The assignment of all known complete sequences up-to-date confirmed the previous six major genotypes and one new sequence, which have been provisionally assigned as subtype 7a. New recombinant forms of HCV, although uncommon, have been detected and were found to have different crossover points. CONCLUSION This updated analysis based on the complete region of HCV confirmed the validity of the previously assigned genotypes/subtypes and provided an up-to-date reference for future basic research and clinical studies.
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Affiliation(s)
- Tatsunori Nakano
- Department of Internal Medicine, Fujita Health University Nanakuri Sanatorium, Mie, Japan
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53
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Brahim I, Akil A, Mtairag EM, Pouillot R, Malki AE, Nadir S, Alaoui R, Njouom R, Pineau P, Ezzikouri S, Benjelloun S. Morocco underwent a drift of circulating hepatitis C virus subtypes in recent decades. Arch Virol 2011; 157:515-20. [PMID: 22160625 DOI: 10.1007/s00705-011-1193-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 12/01/2011] [Indexed: 12/11/2022]
Abstract
Hepatitis C virus (HCV) isolates circulating in Morocco are poorly documented. To determine the subgenotype distribution of HCV in chronically infected patients, serum samples from 185 anti-HCV-positive patients were analyzed. Determination of the HCV genotype and subtype was performed by sequencing the 5'UTR, NS5B and core regions. According to the NS5B phylogeny, the HCV strains primarily belonged to subtypes 1b (75.2%), 2i (19.1%) and 2k (2.8%). Using a Bayesian approach, the mean date of appearance of the most recent common ancestor was estimated to be 1910 for HCV-1b and 1854 for HCV-2i. Although it is currently the most frequent genotype in Morocco and the dominant form in hepatocellular carcinoma, it thus appears that HCV-1b was introduced into the population subsequently to HCV-2i.
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Affiliation(s)
- Ikram Brahim
- Virology Unit, Viral Hepatitis Laboratory, Pasteur Institute of Morocco, 1, Place Louis Pasteur, 20360 Casablanca, Morocco
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Origin and evolution of the unique hepatitis C virus circulating recombinant form 2k/1b. J Virol 2011; 86:2212-20. [PMID: 22114341 DOI: 10.1128/jvi.06184-11] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Since its initial identification in St. Petersburg, Russia, the recombinant hepatitis C virus (HCV) 2k/1b has been isolated from several countries throughout Eurasia. The 2k/1b strain is the only recombinant HCV to have spread widely, raising questions about the epidemiological background in which it first appeared. In order to further understand the circumstances by which HCV recombinants might be formed and spread, we estimated the date of the recombination event that generated the 2k/1b strain using a Bayesian phylogenetic approach. Our study incorporates newly isolated 2k/1b strains from Amsterdam, The Netherlands, and has employed a hierarchical Bayesian framework to combine information from different genomic regions. We estimate that 2k/1b originated sometime between 1923 and 1956, substantially before the first detection of the strain in 1999. The timescale and the geographic spread of 2k/1b suggest that it originated in the former Soviet Union at about the time that the world's first centralized national blood transfusion and storage service was being established. We also reconstructed the epidemic history of 2k/1b using coalescent theory-based methods, matching patterns previously reported for other epidemic HCV subtypes. This study demonstrates the practicality of jointly estimating dates of recombination from flanking regions of the breakpoint and further illustrates that rare genetic-exchange events can be particularly informative about the underlying epidemiological processes.
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Abstract
Hepatitis C virus (HCV) is a Flavivirus with a positive-sense, single-stranded RNA genome of about 9,600 nucleotides. It is a major cause of liver disease, infecting almost 200 million people all over the world. Similarly to most RNA viruses, HCV displays very high levels of genetic diversity which have been used to differentiate six major genotypes and about 80 subtypes. Although the different genotypes and subtypes share basic biological and pathogenic features they differ in clinical outcomes, response to treatment and epidemiology. The first HCV recombinant strain, in which different genome segments derived from parentals of different genotypes, was described in St. Petersburg (Russia) in 2002. Since then, there have been only a few more than a dozen reports including descriptions of HCV recombinants at all levels: between genotypes, between subtypes of the same genotype and even between strains of the same subtype. Here, we review the literature considering the reasons underlying the difficulties for unequivocally establishing recombination in this virus along with the analytical methods necessary to do it. Finally, we analyze the potential consequences, especially in clinical practice, of HCV recombination in light of the coming new therapeutic approaches against this virus.
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56
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Bhattacharya D, Accola MA, Ansari IH, Striker R, Rehrauer WM. Naturally occurring genotype 2b/1a hepatitis C virus in the United States. Virol J 2011; 8:458. [PMID: 21967740 PMCID: PMC3205070 DOI: 10.1186/1743-422x-8-458] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Accepted: 10/03/2011] [Indexed: 12/20/2022] Open
Abstract
Background Hepatitis C Virus (HCV) infected patients are frequently repeatedly exposed to the virus, but very few recombinants between two genotypes have been reported. Findings We describe the discovery of an HCV recombinant using a method developed in a United States clinical lab for HCV genotyping that employs sequencing of both 5' and 3' portions of the HCV genome. Over twelve months, 133 consecutive isolates were analyzed, and a virus from one patient was found with discordant 5' and 3' sequences suggesting it was a genotype 2b/1a recombinant. We ruled out a mixed infection and mapped a recombination point near the NS2/3 cleavage site. Conclusions This unique HCV recombinant virus described shares some features with other recombinant viruses although it is the only reported recombinant of a genotype 2 with a subtype 1a. This recombinant represents a conundrum for current clinical treatment guidelines, including treatment with protease inhibitors. This recombinant is also challenging to detect by the most commonly employed methods of genotyping that are directed primarily at the 5' structural portion of the HCV genome.
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Affiliation(s)
- Dipankar Bhattacharya
- University of Wisconsin-Madison, School of Medicine and Public Health, Department of Medicine, Madison, WI 53706, USA
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57
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Reiter J, Pérez-Vilaró G, Scheller N, Mina LB, Díez J, Meyerhans A. Hepatitis C virus RNA recombination in cell culture. J Hepatol 2011; 55:777-83. [PMID: 21334392 DOI: 10.1016/j.jhep.2010.12.038] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2010] [Revised: 12/14/2010] [Accepted: 12/20/2010] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS The Hepatitis C virus (HCV) exhibits large genetic diversity, both on a global scale and at the level of the infected individual. A major underlying mechanism of the observed sequence differences is error-prone virus replication by the viral RNA polymerase NS5B. In addition, based on phylogenetic comparisons of patient-derived HCV sequences, there is evidence of HCV recombination. However, to date little is known about the frequency by which recombination events occur in HCV and under what conditions recombination may become important in HCV evolution. We, therefore, aimed to set up an experimental model system that would allow us to analyze and to characterize recombination events during HCV replication. METHODS A neomycin-selectable, HCV replicon-based recombination detection system was established. HCV replicons were mutated within either the neomycin-phosphotransferase gene or the NS5B polymerase. Upon co-transfection of hepatic cells lines, recombination between the mutated sites is necessary to restore the selectable phenotype. RESULTS Recombinants were readily detected with frequencies correlating to the distance between the mutations. The recombinant frequency normalized to a crossover range of one nucleotide was around 4 × 10(-8). CONCLUSIONS An experimental system to select for HCV recombinants in cell culture was successfully established. It allowed deriving first estimates of recombinant frequencies. Based on these, recombination in HCV seems rare. However, due to the rapid virus turnover and the large number of HCV-infected liver cells in vivo, it is expected that recombination will be of biological importance when strong selection pressures are operative.
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Affiliation(s)
- Jochen Reiter
- Department of Virology, Saarland University, D-66421 Hamburg, Germany
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58
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McGee CE, Tsetsarkin KA, Guy B, Lang J, Plante K, Vanlandingham DL, Higgs S. Stability of yellow fever virus under recombinatory pressure as compared with chikungunya virus. PLoS One 2011; 6:e23247. [PMID: 21826243 PMCID: PMC3149644 DOI: 10.1371/journal.pone.0023247] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Accepted: 07/11/2011] [Indexed: 02/08/2023] Open
Abstract
Recombination is a mechanism whereby positive sense single stranded RNA viruses exchange segments of genetic information. Recent phylogenetic analyses of naturally occurring recombinant flaviviruses have raised concerns regarding the potential for the emergence of virulent recombinants either post-vaccination or following co-infection with two distinct wild-type viruses. To characterize the conditions and sequences that favor RNA arthropod-borne virus recombination we constructed yellow fever virus (YFV) 17D recombinant crosses containing complementary deletions in the envelope protein coding sequence. These constructs were designed to strongly favor recombination, and the detection conditions were optimized to achieve high sensitivity recovery of putative recombinants. Full length recombinant YFV 17D virus was never detected under any of the experimental conditions examined, despite achieving estimated YFV replicon co-infection levels of ∼2.4×106 in BHK-21 (vertebrate) cells and ∼1.05×105 in C710 (arthropod) cells. Additionally YFV 17D superinfection resistance was observed in vertebrate and arthropod cells harboring a primary infection with wild-type YFV Asibi strain. Furthermore recombination potential was also evaluated using similarly designed chikungunya virus (CHIKV) replicons towards validation of this strategy for recombination detection. Non-homologus recombination was observed for CHIKV within the structural gene coding sequence resulting in an in-frame duplication of capsid and E3 gene. Based on these data, it is concluded that even in the unlikely event of a high level acute co-infection of two distinct YFV genomes in an arthropod or vertebrate host, the generation of viable flavivirus recombinants is extremely unlikely.
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Affiliation(s)
- Charles E McGee
- Department of Pathology, University of Texas Medical Branch, Galveston, Texas, United States of America.
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59
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Martró E, Valero A, Jordana-Lluch E, Saludes V, Planas R, González-Candelas F, Ausina V, Bracho MA. Hepatitis C virus sequences from different patients confirm the existence and transmissibility of subtype 2q, a rare subtype circulating in the metropolitan area of Barcelona, Spain. J Med Virol 2011; 83:820-6. [PMID: 21412791 DOI: 10.1002/jmv.22054] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The hepatitis C virus (HCV) has been classified into six genotypes and more than 70 subtypes with distinct geographical and epidemiological distributions. While 18 genotype 2 subtypes have been proposed, only 5 have had their complete sequence determined. The aim of this study was to characterize HCV isolates from three patients from the Barcelona metropolitan area of Spain for whom commercial genotyping methods provided discordant results. Full-length genome sequencing was carried out for 2 of the 3 patients; for the third patient only partial NS5B sequences could be obtained. The generated sequences were subjected to phylogenetic, recombination, and identity analyses. Sequences covering most of the HCV genome (9398 and 9566 nt in length) were obtained and showed a 90.3% identity to each other at the nucleotide level, while both sequences differed by 17.5-22.6% from the other fully sequenced genotype 2 subtypes. No evidence of recombination was found. The NS5B phylogenetic tree showed that sequences from the three patients cluster together with the only representative sequence of the provisionally designed 2q subtype, which also corresponds to a patient from Barcelona. Phylogenetic analysis of the full coding sequence showed that subtype 2q was more closely related to subtype 2k. The results obtained in this study suggest that subtype 2q now meets the requirements for confirmed designation status according to consensus criteria for HCV classification and nomenclature, and its epidemiological value is ensured as it has spread among several patients in the Barcelona metropolitan area.
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Affiliation(s)
- Elisa Martró
- Microbiology Service, Health Sciences Research Institute of Germans Trias i Pujol Foundation, Germans Trias i Pujol Hospital, Autonoma University of Barcelona, Badalona, Spain.
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Abstract
Recombination occurs in many RNA viruses and can be of major evolutionary significance. However, rates of recombination vary dramatically among RNA viruses, which can range from clonal to highly recombinogenic. Here, we review the factors that might explain this variation in recombination frequency and show that there is little evidence that recombination is favoured by natural selection to create advantageous genotypes or purge deleterious mutations, as predicted if recombination functions as a form of sexual reproduction. Rather, recombination rates seemingly reflect larger-scale patterns of viral genome organization, such that recombination may be a mechanistic by-product of the evolutionary pressures acting on other aspects of virus biology.
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Affiliation(s)
- Etienne Simon-Loriere
- Center for Infectious Disease Dynamics, Department of Biology, Mueller Laboratory, The Pennsylvania State University, University Park, USA.
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61
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Identification and characterization of a natural inter-genotypic (2b/1b) recombinant hepatitis C virus in Japan. Arch Virol 2011; 156:1591-601. [DOI: 10.1007/s00705-011-1038-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Accepted: 05/17/2011] [Indexed: 12/15/2022]
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Near-full genome characterisation of two natural intergenotypic 2k/1b recombinant hepatitis C virus isolates. Adv Virol 2011; 2011:710438. [PMID: 22315602 PMCID: PMC3270303 DOI: 10.1155/2011/710438] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Accepted: 03/14/2011] [Indexed: 01/11/2023] Open
Abstract
Few natural intergenotypic hepatitis C virus (HCV) recombinants have been characterised, and only RF1_2k/1b has demonstrated widespread transmission. The near-full length genome sequences for two cases of 2k/1b recombinants (CYHCV037 and CYHCV093) sampled in Cyprus were obtained using strain-specific RT-PCR amplification and sequencing protocols. Sequence analysis confirmed their similarity with the original RF1_2k/1b strain from St. Petersburg, N687. These two isolates significantly contribute to the sequence data available on this recombinant and confirm its increasing spread among individuals from Eastern Europe, and its association with transmission through intravenous drug use. Phylogenetic analyses reveal clustering of the sequence 3' to the recombination point, not seen in the topology of the 5' sequences, implying a more complicated evolutionary history than that held to date. The increasing cases of HCV recombinant strains underline the requirement of their contribution to the standardised rules of HCV classification and nomenclature, molecular epidemiology, diagnosis, and treatment.
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63
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Morel V, Fournier C, François C, Brochot E, Helle F, Duverlie G, Castelain S. Genetic recombination of the hepatitis C virus: clinical implications. J Viral Hepat 2011; 18:77-83. [PMID: 21235686 DOI: 10.1111/j.1365-2893.2010.01367.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Genetic recombination is a well-known feature of RNA viruses that plays a significant role in their evolution. Although recombination is well documented for Flaviviridae family viruses, the first natural recombinant strain of hepatitis C virus (HCV) was identified as recently as 2002. Since then, a few other natural inter-genotypic, intra-genotypic and intra-subtype recombinant HCV strains have been described. However, the frequency of recombination may have been underestimated because not all known HCV recombinants are screened for in routine practice. Furthermore, the choice of treatment regimen and its predictive outcome remain problematic as the therapeutic strategy for HCV infection is genotype dependent. HCV recombination also raises many questions concerning its mechanisms and effects on the epidemiological and physiopathological features of the virus. This review provides an update on recombinant HCV strains, the process that gives rise to recombinants and clinical implications of recombination.
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Affiliation(s)
- V Morel
- Virology Department, Amiens University Hospital Center, South Hospital, Amiens, France
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64
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Natural intragenotypic and intergenotypic HCV recombinants are rare in southwest China even among patients with multiple exposures. J Clin Virol 2010; 49:272-6. [DOI: 10.1016/j.jcv.2010.08.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 07/27/2010] [Accepted: 08/17/2010] [Indexed: 02/05/2023]
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65
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Host alternation of chikungunya virus increases fitness while restricting population diversity and adaptability to novel selective pressures. J Virol 2010; 85:1025-35. [PMID: 21047966 DOI: 10.1128/jvi.01918-10] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The mechanisms by which RNA arboviruses, including chikungunya virus (CHIKV), evolve and maintain the ability to infect vertebrate and invertebrate hosts are poorly understood. To understand how host specificity shapes arbovirus populations, we studied CHIKV populations passaged alternately between invertebrate and vertebrate cells (invertebrate ↔ vertebrate) to simulate natural alternation and contrasted the results with those for populations that were artificially released from cycling by passage in single cell types. These CHIKV populations were characterized by measuring genetic diversity, changes in fitness, and adaptability to novel selective pressures. The greatest fitness increases were observed in alternately passaged CHIKV, without drastic changes in population diversity. The greatest increases in genetic diversity were observed after serial passage and correlated with greater adaptability. These results suggest an evolutionary trade-off between maintaining fitness for invertebrate ↔ vertebrate cell cycling, where maximum adaptability is possible only via enhanced population diversity and extensive exploration of sequence space.
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66
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Utama A, Tania NP, Dhenni R, Gani RA, Hasan I, Sanityoso A, Lelosutan SAR, Martamala R, Lesmana LA, Sulaiman A, Tai S. Genotype diversity of hepatitis C virus (HCV) in HCV-associated liver disease patients in Indonesia. Liver Int 2010; 30:1152-60. [PMID: 20492518 DOI: 10.1111/j.1478-3231.2010.02280.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Hepatitis C virus (HCV) genotype distribution in Indonesia has been reported. However, the identification of HCV genotype was based on 5'-UTR or NS5B sequence. AIMS This study was aimed to observe HCV core sequence variation among HCV-associated liver disease patients in Jakarta, and to analyse the HCV genotype diversity based on the core sequence. METHODS Sixty-eight chronic hepatitis (CH), 48 liver cirrhosis (LC) and 34 hepatocellular carcinoma (HCC) were included in this study. HCV core variation was analysed by direct sequencing. RESULTS Alignment of HCV core sequences demonstrated that the core sequence was relatively varied among the genotype. Indeed, 237 bases of the core sequence could classify the HCV subtype; however, 236 bases failed to differentiate several subtypes. Based on 237 bases of the core sequences, the HCV strains were classified into genotypes 1 (subtypes 1a, 1b and 1c), 2 (subtypes 2a, 2e and 2f) and 3 (subtypes 3a and 3k). The HCV 1b (47.3%) was the most prevalent, followed by subtypes 1c (18.7%), 3k (10.7%), 2a (10.0%), 1a (6.7%), 2e (5.3%), 2f (0.7%) and 3a (0.7%). HCV 1b was the most common in all patients, and the prevalence increased with the severity of liver disease (36.8% in CH, 54.2% in LC and 58.8% in HCC). These results were similar to a previous report based on NS5B sequence analysis. CONCLUSION Hepatitis C virus core sequence (237 bases) could identify the HCV subtype and the prevalence of HCV subtype based on core sequence was similar to those based on the NS5B region.
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Affiliation(s)
- Andi Utama
- Molecular Epidemiology Division, Mochtar Riady Institute for Nanotechnology, Lippo Karawaci, Tangerang, Banten, Indonesia.
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Baclig MO, Chan VF, Ramos JDA, Gopez-Cervantes J, Natividad FF. Correlation of the 5'untranslated region (5'UTR) and non-structural 5B (NS5B) nucleotide sequences in hepatitis C virus subtyping. INTERNATIONAL JOURNAL OF MOLECULAR EPIDEMIOLOGY AND GENETICS 2010; 1:236-244. [PMID: 21537395 PMCID: PMC3076768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Accepted: 07/04/2010] [Indexed: 05/30/2023]
Abstract
The 5'untranslated region (5'UTR) is often targeted to detect major genotypes in hepatitis C virus (HCV) but its insufficient sequence variation limits its usefulness for differentiating HCV subtypes. Subtyping has important implications to epidemiologic studies, clinical management, and vaccine development. Analysis of the nucleotide sequence of variable regions such as the non-structural 5B (NS5B) is considered the reference method for identifying HCV subtypes. We evaluated the accuracy of subtyping of HCV genotype 1 (HCV-1) samples from the Philippines by 5'UTR sequencing as compared with the NS5B sequence. A total of 30 patients infected with HCV-1 previously confirmed by PCR-RFLP and clinically diagnosed with chronic hepatitis C were analyzed. Nucleotide sequencing of the 5'UTR showed that 15 (50%) were identified as 1a and 15 (50%) were identified as 1b. Sequence analysis of the NS5B revealed that 13 (43%) belonged to subtype 1a while 17 (57%) belonged to subtype 1b. The most predominant subtype was 1b by NS5B sequencing. The predictive value of 5'UTR sequencing to subtype 1a was 73% while for subtype 1b, predictive value was 87%. Overall concordance between 5'UTR and NS5B sequencing was 80%. NS5B sequence and phylogenetic analysis is still the reference method for identifying HCV-1a and 1b subtypes.
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68
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Viazov S, Ross SS, Kyuregyan KK, Timm J, Neumann-Haefelin C, Isaeva OV, Popova OE, Dmitriev PN, El Sharkawi F, Thimme R, Michailov MI, Roggendorf M. Hepatitis C virus recombinants are rare even among intravenous drug users. J Med Virol 2010; 82:232-8. [PMID: 20029799 DOI: 10.1002/jmv.21631] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Systematic studies of the circulation of hepatitis C virus (HCV) recombinants in different parts of the world have been initiated only recently, and no detailed information on this subject is available. The aim of the current investigation was to determine the frequency of HCV recombinants in intravenous drug users (IVDU) from two European countries. HCV RNA from serum samples was tested by RT-PCR with primers derived from the core and NS5B regions with subsequent sequencing and genotype assignment. The 118 samples from Germany (100%) and 45 out of 47 (96%) sera from Russia demonstrated concordant genotyping results. In the two genotype discrepant sera from Russia 2k/1b recombinants were identified. In order to test the hypothesis that the individuals from the IVDU group might be multiply exposed to various genotypes, 145 out of 165 genotyped serum samples, which were found to be positive for anti-NS4 antibodies, were serotyped with the Murex HCV serotyping kit that is based on detection of antibodies to type-specific peptides derived from the NS4 proteins of different HCV genotypes. Discrepancy in genotype and serotype attributions was observed in 11% cases. Retesting of 99 type 1a or 3a samples with a set of type- and subtype-specific primers revealed the presence of a mixed infection only in one case (1a/3a). Thus, the cases of the mixed infection with different HCV genotypes as well as the recombinant forms of HCV are very rare even in such a highly exposed group as IVDU.
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Affiliation(s)
- Sergei Viazov
- Institute of Virology, Essen University Hospital, Essen, Germany.
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69
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Akkarathamrongsin S, Praianantathavorn K, Hacharoen N, Theamboonlers A, Tangkijvanich P, Tanaka Y, Mizokami M, Poovorawan Y. Geographic distribution of hepatitis C virus genotype 6 subtypes in Thailand. J Med Virol 2010; 82:257-62. [PMID: 20029811 DOI: 10.1002/jmv.21680] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The nucleotide sequence of hepatitis C virus (HCV) genotype 6 found mostly in south China and south-east Asia, displays profound genetic diversity. The aim of this study to determine the genetic variability of HCV genotype 6 (HCV-6) in Thailand and locate the subtype distribution of genotype 6 in various geographic areas. Four hundred nineteen anti-HCV positive serum samples were collected from patients residing in - the central part of the country. HCV RNA positive samples based on reverse transcriptase- polymerase chain reaction (RT-PCR) of the 5'UTR were amplified with primers specific for the core and NS5B regions. Nucleotide sequences of both regions were analyzed for the genotype by phylogenetic analysis. To determine geographic distribution of HCV-6 subtypes, a search of the international database on subtype distribution in the respective countries was conducted. Among 375 HCV RNA positive samples, 71 had HCV-6 based on phylogenetic analysis of partial core and NS5B regions. The subtype distribution in order of predominance was 6f (56%), 6n (22%), 6i (11%), 6j (10%), and 6e (1%). Among the 13 countries with different subtypes of HCV-6, most sequences have been reported from Vietnam. Subtype 6f was found exclusively in Thailand where five distinct HCV-6 subtypes are circulating. HCV-6, which is endemic in south China and south-east Asia, displays profound genetic diversity and may have evolved over a considerable period of time.
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Lee YM, Lin HJ, Chen YJ, Lee CM, Wang SF, Chang KY, Chen TL, Liu HF, Chen YMA. Molecular epidemiology of HCV genotypes among injection drug users in Taiwan: Full-length sequences of two new subtype 6w strains and a recombinant form_2b6w. J Med Virol 2010; 82:57-68. [PMID: 19950240 DOI: 10.1002/jmv.21658] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Human immunodeficiency virus type 1 (HIV-1) circulating recombinant form (CRF) 07_BC strain has caused serious outbreaks among injection drug users in Taiwan since 2004. The objective of this study was to conduct a molecular epidemiological study of HCV genotypes in intravenous drug users in Taiwan. Blood samples and questionnaires from 591 intravenous drug users infected with HIV-1 were collected nationwide. In total, 180 samples were selected for HCV genotyping using multiplex PCR and phylogenetic analysis of the core, E1 and NS5B regions. The Inno-Lipa assay was used to confirm multiple infections with different genotypes. Eighty percent had a single infection with subtype 1b being the most common subtype (24%), 12% had double infections and two had triple infections. In addition, three recombinant forms (RFs)-2a1a, 3a1b, and 2b6w were identified. Phylogenetic analyses showed that the 3a, 6a, and 6n strains were clustered with strains present in Thailand and mainland China. Full-length sequence analysis showed that two 6w strains shared 89.4-90.2% sequence homology with the 6(r) strain from the Guangdong Province, China. Bootscan analysis revealed that the recombination breakpoint of RF_2b6w was located at the NS2-NS3 junction. In summary, the distribution of HCV genotypes among Taiwanese intravenous drug users was complex and more than 12% of the drug users were infected with more than one genotype of HCV.
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Affiliation(s)
- Yuan-Ming Lee
- AIDS Prevention and Research Center, National Yang-Ming University, Taipei, Taiwan
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71
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Morel V, Descamps V, François C, Fournier C, Brochot E, Capron D, Duverlie G, Castelain S. Emergence of a genomic variant of the recombinant 2k/1b strain during a mixed Hepatitis C infection: a case report. J Clin Virol 2010; 47:382-6. [PMID: 20153975 DOI: 10.1016/j.jcv.2010.01.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Revised: 01/18/2010] [Accepted: 01/22/2010] [Indexed: 12/22/2022]
Abstract
To date, few natural intergenotypic recombinant hepatitis C virus (HCV) strains have been characterized. A recombinant strain 2k/1b was detected for one HCV RNA-positive individual who had just completed therapy for HCV 3a genotype infection. In the present report, five serum samples collected over the pre- and post-treatment periods were used to investigate all the present HCV strains and the change over time of the infection pattern. Interestingly, the 2k/1b strain was already present during the genotype 3a infection and persisted during treatment. In the specimen collected three months post-treatment, two distinct strains, 2k/1b and type 1, were found and then one 2k/1b strain in the subsequent ones. A genomic variant of the HCV RF1_2k/1b strain was identified. It was part of a mixed HCV infection and persisted and re-emerge after eradication of the dominant subtype 3a. This case indicates that HCV co-infection screening after relapse should be an alternative to explain the lack of response to treatment and the necessity to carefully study the epidemic spreading of this recombinant strain.
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Affiliation(s)
- Virginie Morel
- Virology Department, Amiens University Hospital Center, South Hospital, EA4294-Jules Verne University of Picardy, F-80054 Amiens Cedex 1, France
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72
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Hoshino H, Hino K, Miyakawa H, Takahashi K, Mishiro S. A novel 2b/1b-recombinant HCV found in a case with discrepancy between serotype and genotype assessed by conventional methods. ACTA ACUST UNITED AC 2010. [DOI: 10.2957/kanzo.51.319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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73
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Moreno P, Alvarez M, López L, Moratorio G, Casane D, Castells M, Castro S, Cristina J, Colina R. Evidence of recombination in Hepatitis C Virus populations infecting a hemophiliac patient. Virol J 2009; 6:203. [PMID: 19922637 PMCID: PMC2784780 DOI: 10.1186/1743-422x-6-203] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2009] [Accepted: 11/18/2009] [Indexed: 12/20/2022] Open
Abstract
Background/Aim Hepatitis C virus (HCV) infection is an important cause of morbidity and mortality in patients affected by hereditary bleeding disorders. HCV, as others RNA virus, exploit all possible mechanisms of genetic variation to ensure their survival, such as recombination and mutation. In order to gain insight into the genetic variability of HCV virus strains circulating in hemophiliac patients, we have performed a phylogenetic analysis of HCV strains isolated from 10 patients with this kind of pathology. Methods Putative recombinant sequence was identified with the use of GARD program. Statistical support for the presence of a recombination event was done by the use of LARD program. Results A new intragenotypic recombinant strain (1b/1a) was detected in 1 out of the 10 hemophiliac patient studied. The recombination event was located at position 387 of the HCV genome (relative to strain AF009606, sub-type 1a) corresponding to the core gene region. Conclusion Although recombination may not appear to be common among natural populations of HCV it should be considered as a possible mechanism for generating genetic diversity in hemophiliacs patients.
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Affiliation(s)
- Pilar Moreno
- Laboratorio de Virología Molecular, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay.
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74
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Abstract
International standardization and coordination of the nomenclature of variants of hepatitis C virus (HCV) is increasingly needed as more is discovered about the scale of HCV-related liver disease and important biological and antigenic differences that exist between variants. Consistency in numbering is also increasingly required for functional and clinical studies of HCV. For example, an unambiguous method for referring to amino acid substitutions at specific positions in NS3 and NS5B coding sequences associated with resistance to specific HCV inhibitors is essential in the investigation of antiviral treatment. Inconsistent and inaccurate numbering of locations in DNA and protein sequences is becoming a problem in the HCV scientific literature.A group of experts in the field of HCV genetic variability, and those involved in development of HCV sequence databases, the Hepatitis Virus Database (Japan), euHCVdb (France), and the Los Alamos National Laboratory (United States), convened to reexamine the status of HCV genotype nomenclature, resolve conflicting genotype or subtype names among described variants of HCV, and draw up revised criteria for the assignment of new genotypes as they are discovered in the future. They also discussed how HCV sequence databases could introduce and facilitate a standardized numbering system for HCV nucleotides, proteins, and epitopes.A comprehensive listing of all currently classified variants of HCV incorporates a number of agreed genotype and subtype name reassignments to create consistency in nomenclature. A consensus proposal was drawn up for the classification of new variants into genotypes and subtypes, which recognizes and incorporates new knowledge of HCV genetic diversity and epidemiology. The proposed numbering system was adapted from the Los Alamos HIV database, with elements from the hepatitis B virus numbering system. The system comprises both nucleotides and amino acid sequences and epitopes, and uses the full-length genome sequence of isolate H77 (accession number AF009606) as a reference. It includes a method for numbering insertions and deletions relative to this reference sequence.
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Affiliation(s)
- Carla Kuiken
- Los Alamos National Laboratory, Los Alamos, NM, USA
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75
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Naturally occurring hepatitis C virus subgenomic deletion mutants replicate efficiently in Huh-7 cells and are trans-packaged in vitro to generate infectious defective particles. J Virol 2009; 83:9079-93. [PMID: 19587042 DOI: 10.1128/jvi.00308-09] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Naturally occurring hepatitis C virus (HCV) subgenomic RNAs have been found in several HCV patients. These subgenomic deletion mutants, mostly lacking the genes encoding envelope glycoproteins, were found in both liver and serum, where their relatively high abundance suggests that they are capable of autonomous replication and can be packaged and secreted in viral particles, presumably harboring the envelope proteins from wild type virus coinfecting the same cell. We recapitulated some of these natural subgenomic deletions in the context of the isolate JFH-1 and confirmed these hypotheses in vitro. In Huh-7.5 cells, these deletion-containing genomes show robust replication and can be efficiently trans-packaged and infect naïve Huh-7.5 cells when cotransfected with the full-length wild-type J6/JFH genome. The genome structure of these natural subgenomic deletion mutants was dissected, and the maintenance of both core and NS2 regions was proven to be significant for efficient replication and trans-packaging. To further explore the requirements needed to achieve trans-complementation, we provided different combinations of structural proteins in trans. Optimal trans-complementation was obtained when fragments of the polyprotein encompassing core to p7 or E1 to NS2 were expressed. Finally, we generated a stable helper cell line, constitutively expressing the structural proteins from core to p7, which efficiently supports trans-complementation of a subgenomic deletion encompassing amino acids 284 to 732. This cell line can produce and be infected by defective particles, thus representing a powerful tool to investigate the life cycle and relevance of natural HCV subgenomic deletion mutants in vivo.
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76
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Argentini C, Genovese D, Dettori S, Rapicetta M. HCV genetic variability: from quasispecies evolution to genotype classification. Future Microbiol 2009; 4:359-73. [PMID: 19327119 DOI: 10.2217/fmb.09.8] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
HCV is a ssRNA virus belonging to the Flaviviruses and is found worldwide worldwide in humans. Following primary infection, persistent infection develops in more than 85% of cases, which in up to 30% of cases, may progress to liver disease, cirrhosis and hepatocellular carcinoma. The virus presents a high degree of genetic variability owing to the combination of a lack of proofreading by the RNA-dependent RNA polymerase and a high level of viral replication. This genetic variability allows the classification of genotypes, subtypes, isolates and quasispecies to which epidemiological and pathogenetic significance may be associated. The features and biological implications of HCV variability and of quasispecies dynamics in infection transmission, mechanisms of chronicity and resistance to antiviral therapy are discussed.
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Affiliation(s)
- Claudio Argentini
- Viral Hepatitis Unit, Department of Infectious, Parasitic & Immune-Mediated Disease, Istituto Superiore di Sanità, Viale Regina Elena 299, Rome, Italy.
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77
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Li C, Lu L, Wu X, Wang C, Bennett P, Lu T, Murphy D. Complete genomic sequences for hepatitis C virus subtypes 4b, 4c, 4d, 4g, 4k, 4l, 4m, 4n, 4o, 4p, 4q, 4r and 4t. J Gen Virol 2009; 90:1820-1826. [PMID: 19357224 DOI: 10.1099/vir.0.010330-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
In this study, we characterized the full-length genomic sequences of 13 distinct hepatitis C virus (HCV) genotype 4 isolates/subtypes: QC264/4b, QC381/4c, QC382/4d, QC193/4g, QC383/4k, QC274/4l, QC249/4m, QC97/4n, QC93/4o, QC139/4p, QC262/4q, QC384/4r and QC155/4t. These were amplified, using RT-PCR, from the sera of patients now residing in Canada, 11 of which were African immigrants. The resulting genomes varied between 9421 and 9475 nt in length and each contains a single ORF of 9018-9069 nt. The sequences showed nucleotide similarities of 77.3-84.3 % in comparison with subtypes 4a (GenBank accession no. Y11604) and 4f (EF589160) and 70.6-72.8 % in comparison with genotype 1 (M62321/1a, M58335/1b, D14853/1c, and 1?/AJ851228) reference sequences. These similarities were often higher than those currently defined by HCV classification criteria for subtype (75.0-80.0 %) and genotype (67.0-70.0 %) division, respectively. Further analyses of the complete and partial E1 and partial NS5B sequences confirmed these 13 'provisionally assigned subtypes'.
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Affiliation(s)
- Chunhua Li
- Division of Gastroenterology-Hepatology and Nutrition, Department of Medicine, University of Utah, 30N 1900E, Salt Lake City, UT 84132, USA
| | - Ling Lu
- Division of Gastroenterology-Hepatology and Nutrition, Department of Medicine, University of Utah, 30N 1900E, Salt Lake City, UT 84132, USA
| | - Xianghong Wu
- Department of Biology, Kunming Teacher's College, Kunming, Yunnan, PR China
| | - Chuanxi Wang
- Guangzhou Blood Center, Guangzhou, Guangdong, PR China.,Division of Gastroenterology-Hepatology and Nutrition, Department of Medicine, University of Utah, 30N 1900E, Salt Lake City, UT 84132, USA
| | - Phil Bennett
- Micropathology Ltd, University of Warwick Science Park, Coventry, UK
| | - Teng Lu
- University of Georgia, Athens, GA, USA
| | - Donald Murphy
- Institut national de santé publique du Québec, Laboratoire de santé publique du Québec, Sainte-Anne-de-Bellevue, QC, Canada
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78
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Demetriou VL, van de Vijver DAMC, Kostrikis LG. Molecular epidemiology of hepatitis C infection in Cyprus: evidence of polyphyletic infection. J Med Virol 2009; 81:238-48. [PMID: 19107977 DOI: 10.1002/jmv.21370] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The genetic diversity of the hepatitis C virus (HCV) in Cyprus is investigated for the first time in this study. Nucleotide sequence analysis of the CORE-E1 and NS5B regions of the HCV genome was performed on blood plasma samples obtained from 77 HCV patients in Cyprus, collected during 2005-2008. The amplified products were sequenced and compared to reference HCV strains of known genotype and subtype in order to classify the isolates found in this study. Genotype could be determined for all strains, and subtype for all but four isolates. Phylogenetic analysis revealed that 51 patients were genotype 1, of which 38 were subtype 1b, 9 were 1a, and 1 was unclassified, one patient was genotype 2c, 13 were genotype 3a, nine were genotype 4, of which six were subtype 4a, and three were of unclassified subtype, one was genotype 5a, two patients seem to carry a possible 2k/1b recombinant strain, and no genotype 6 strains were found. This study demonstrated a genetic heterogeneity of HCV infection in Cyprus, with five of the six known HCV genotypes on the island, including unclassified isolates in genotypes 1 and 4, and also the apparent introduction of the 2k/1b recombinant strain in intravenous drug users.
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79
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Oniangue-Ndza C, Aus dem Siepen M, Lohmann V, Wiese M, Viazov S, Roggendorf M. In vitro replicative properties of replicons constructed using sequence variants of the hepatitis C virus strain AD78 that caused a single-source outbreak of hepatitis C. Virus Res 2009; 142:1-9. [PMID: 19103237 DOI: 10.1016/j.virusres.2008.11.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2008] [Revised: 11/18/2008] [Accepted: 11/19/2008] [Indexed: 01/22/2023]
Abstract
For many aspects of HCV research it would be very useful to have a set of replicons in which different genome regions are swapped by corresponding fragments from isolates of the same viral strain that might demonstrate different biological characteristics or bear evolving antigenic determinants. The isolates of the same HCV strain that are necessary for generation of such hybrid replicons might be obtained from a single-source outbreak of HCV infection. One such outbreak caused by the HCV AD78 strain, occurred in Germany due to infection of women by contaminated anti-D globulin. Using a sequential substitution of different segments of the Con1 replicon with the corresponding fragments from the AD78 strain of HCV, a set of chimeric Con1/AD78 subgenomic and full-length, AD78-based genomic replicons were generated. These replicons might be used as a new experimental tool for different aspects of HCV research, including studies of the nature of isolate-specific differences in interactions of the replicon with the host cell and analysis of the mechanisms of HCV resistance to antivirals. The newly generated full-length replicon can also be used for preparation of AD78-specific target cell lines, which may be invaluable for the analysis of the evolution of HCV cellular immune responses in the cohort of patients infected with the HCV AD78 strain.
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Affiliation(s)
- Cesar Oniangue-Ndza
- Institute of Virology, Essen University Hospital, Hufelandstr. 55, University of Duisburg-Essen, 45122 Essen, Germany
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80
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Kurbanov F, Tanaka Y, Chub E, Maruyama I, Azlarova A, Kamitsukasa H, Ohno T, Bonetto S, Moreau I, Fanning LJ, Legrand-Abravanel F, Izopet J, Naoumov N, Shimada T, Netesov S, Mizokami M. Molecular epidemiology and interferon susceptibility of the natural recombinant hepatitis C virus strain RF1_2k/1b. J Infect Dis 2009; 198:1448-56. [PMID: 18928375 DOI: 10.1086/592757] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Hepatitis C virus (HCV) genotype is an important determinant of virological response to antiviral therapies. Currently, there are no data available on the molecular epidemiology and interferon susceptibility of the natural intergenotypic recombinant RF1_2k/1b (RF1) strain. METHODS Genotyping and RF1-PCR screening were performed on samples from 604 HCV RNA-positive individuals from 7 countries. uPA/SCID mice carrying human hepatocytes (chimeric mice) were infected with the RF1_2k/1b strain, and the susceptibility of the strain to interferon and ribavirin was compared with the susceptibilities of 2 different strains of genotype B, used as references. RESULTS Six new RF1 cases were identified in this study; 5 (2%) of 281 in Russia and 1 (1%) of 90 in Uzbekistan. Phylogenetic analyses based on Core/E1 and NS5b indicated that all RF1 representatives share a common evolutionary ancestor. Infection with RF1 was established in chimeric mice. Reduction of RF1 viral load was observed in response to 3 injections of 3 microg/kg pegylated-interferon alpha-2a alone or in combination with 50 mg/kg of ribavirin (0.5 or 1.4 log-copies/mL). CONCLUSIONS All identified RF1-type strains appear to be introduced from a single source, suggesting that intergenotypic recombination in HCV is sporadic and not associated with cocirculation of different genotypes in a population. The RF1 strain in this study was responsive to interferon in vivo.
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Affiliation(s)
- Fuat Kurbanov
- Department of Clinical Molecular Informative Medicine, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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81
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Pybus OG, Barnes E, Taggart R, Lemey P, Markov PV, Rasachak B, Syhavong B, Phetsouvanah R, Sheridan I, Humphreys IS, Lu L, Newton PN, Klenerman P. Genetic history of hepatitis C virus in East Asia. J Virol 2009; 83:1071-82. [PMID: 18971279 PMCID: PMC2612398 DOI: 10.1128/jvi.01501-08] [Citation(s) in RCA: 161] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2008] [Accepted: 10/20/2008] [Indexed: 12/12/2022] Open
Abstract
The hepatitis C virus (HCV), which currently infects an estimated 3% of people worldwide, has been present in some human populations for several centuries, notably HCV genotypes 1 and 2 in West Africa and genotype 6 in Southeast Asia. Here we use newly developed methods of sequence analysis to conduct the first comprehensive investigation of the epidemic and evolutionary history of HCV in Asia. Our analysis includes new HCV core (n = 16) and NS5B (n = 14) gene sequences, obtained from serum samples of jaundiced patients from Laos. These exceptionally diverse isolates were analyzed in conjunction with all available reference strains using phylogenetic and Bayesian coalescent methods. We performed statistical tests of phylogeographic structure and applied a recently developed "relaxed molecular clock" approach to HCV for the first time, which indicated an unexpectedly high degree of rate variation. Our results reveal a >1,000-year-long development of genotype 6 in Asia, characterized by substantial phylogeographic structure and two distinct phases of epidemic history, before and during the 20th century. We conclude that HCV lineages representing preexisting and spatially restricted strains were involved in multiple, independent local epidemics during the 20th century. Our analysis explains the generation and maintenance of HCV diversity in Asia and could provide a template for further investigations of HCV spread in other regions.
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Affiliation(s)
- Oliver G Pybus
- Department of Zoology, University of Oxford, Oxford, United Kingdom.
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82
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Jensen T, Gottwein J, Scheel T, Hoegh A, Eugen‐Olsen J, Bukh J. Highly Efficient JFH1‐Based Cell‐Culture System for Hepatitis C Virus Genotype 5a: Failure of Homologous Neutralizing‐Antibody Treatment to Control Infection. J Infect Dis 2008; 198:1756-65. [DOI: 10.1086/593021] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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83
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He CQ, Ma LY, Wang D, Li GR, Ding NZ. Homologous recombination is apparent in infectious bursal disease virus. Virology 2008; 384:51-8. [PMID: 19064275 DOI: 10.1016/j.virol.2008.11.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Revised: 10/31/2008] [Accepted: 11/04/2008] [Indexed: 11/16/2022]
Abstract
Infectious bursal disease virus (IBDV) is a non-enveloped double-stranded RNA virus belonging to the Birnaviridae family. It shows substantial variation in the major antigen region of the viral capsid protein VP2, where a hypervariable region plays a key role in the virulence of IBDV and its epitope. This study identifies several putative recombinants from previously published data to suggest that homologous recombination may naturally occur between different IBDV strains. In addition, a novel very virulence sublineage emerges in the VP2 phylogenic tree, comprising three putative recombination strains isolated in Korea and China, KSH, KK1 and SH-h. The major putative parents of the three mosaics are descended from the vaccine lineage while their hypervariable regions from vvIBDV. These findings also suggest that vaccine coverage may have influence on the evolution and genetic diversity of IBDV, resulting in a novel group with vvIBDV phenotype through recombination with wild IBDV.
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Affiliation(s)
- Cheng-Qiang He
- College of Life Science, Shandong Normal University, Jinan, China.
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84
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Tan Y, Wei QH, Chen LJ, Chan PC, Lai WS, He ML, Kung HF, Lee SS. Molecular epidemiology of HCV monoinfection and HIV/HCV coinfection in injection drug users in Liuzhou, Southern China. PLoS One 2008; 3:e3608. [PMID: 18974888 PMCID: PMC2571986 DOI: 10.1371/journal.pone.0003608] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2008] [Accepted: 10/05/2008] [Indexed: 02/07/2023] Open
Abstract
Background Hepatitis C virus (HCV) mono-infection and HCV/HIV (human immunodeficiency virus) co-infection are growing problems in injection drug users (IDU). Their prevalence and genotypic patterns vary with geographic locations. Access to harm reduction measures is opening up opportunities for improving the HIV/HCV profiling of IDU in China, where IDUs account for a significant proportion of the two infections especially in the southern part of the country. Methodology/Principal Findings A cross sectional study was conducted. Through the Liuzhou Methadone Clinic, a total of 117 injection drug users (IDUs) were recruited from Guangxi, Southern China. A majority of the IDUs (96%) were HCV antibody positive, of which 21% were HIV infected. Unlike HCV monoinfection, there was spatial heterogeneity in the distribution of HIV/HCV coinfection, the latter also characterized by a higher prevalence of needle-sharing. Phylogenetic analysis revealed that genotype 6a was predominant in the study population. There were shorter genetic distances among the 6a sequences compared to the other HCV subtypes-1a, 3a, and 3b. Conclusion/Significance The results suggested that HIV and HCV were introduced at around the same time to the IDU populations in Southern China, followed by their differential spread as determined by the biologic characteristics of the virus and the intensity of behavioural risk. This pattern is different from that in other South East Asian countries where HCV infections have probably predated HIV.
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Affiliation(s)
- Yi Tan
- Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China
| | - Qi Hou Wei
- Liuzhou Center for Disease Control and Prevention, Guangxi, China
| | - Liu Jun Chen
- Liuzhou Center for Disease Control and Prevention, Guangxi, China
| | - Pui Chung Chan
- Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China
| | - Wen Sheng Lai
- Liuzhou Center for Disease Control and Prevention, Guangxi, China
| | - Ming Liang He
- Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China
| | - Hsiang Fu Kung
- Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China
| | - Shui Shan Lee
- Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Hong Kong, China
- Department of Microbiology, The Chinese University of Hong Kong, Hong Kong, China
- * E-mail:
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85
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Ross RS, Verbeeck J, Viazov S, Lemey P, Van Ranst M, Roggendorf M. Evidence for a complex mosaic genome pattern in a full-length hepatitis C virus sequence. Evol Bioinform Online 2008; 4:249-54. [PMID: 19204822 PMCID: PMC2614189 DOI: 10.4137/ebo.s1038] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The genome of the hepatitis C virus (HCV) exhibits a high genetic variability. This remarkable heterogeneity is mainly attributed to the gradual accumulation of mutational changes, whereas the contribution of recombination events to the evolution of HCV remains controversial so far. While performing phylogenetic analyses including a large number of sequences deposited in the GenBank, we encountered a full-length HCV sequence (AY651061) that showed evidence for inter-subtype recombination and was, therefore, subjected to a detailed analysis of its molecular structure. The obtained results indicated that AY651061 does not represent a "simple" HCV 1c isolate, but a complex 1a/1c mosaic genome, showing five putative breakpoints in the core to NS3 regions. To our knowledge, this is the first report on a mosaic HCV full-length sequence with multiple breakpoints. The molecular structure of AY651061 is reminiscent of complex homologous recombinant variants occurring among other members of the flaviviridae family, e.g. GB virus C, dengue virus, and Japanese encephalitis virus. Our finding of a mosaic HCV sequence may have important implications for many fields of current HCV research which merit careful consideration.
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Affiliation(s)
- R S Ross
- Institute of Virology, National Reference Centre for HCV, Essen University Hospital, University of Duisburg-Essen, Essen, Germany.
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86
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Jirasko V, Montserret R, Appel N, Janvier A, Eustachi L, Brohm C, Steinmann E, Pietschmann T, Penin F, Bartenschlager R. Structural and functional characterization of nonstructural protein 2 for its role in hepatitis C virus assembly. J Biol Chem 2008; 283:28546-62. [PMID: 18644781 PMCID: PMC2661407 DOI: 10.1074/jbc.m803981200] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2008] [Revised: 07/18/2008] [Indexed: 12/28/2022] Open
Abstract
The hepatitis C virus (HCV) is a flavivirus replicating in the cytoplasm of infected cells. The HCV genome is a single-stranded RNA encoding a polyprotein that is cleaved by cellular and viral proteases into 10 different products. While the structural proteins core protein, envelope protein 1 (E1) and E2 build up the virus particle, most nonstructural (NS) proteins are required for RNA replication. One of the least studied proteins is NS2, which is composed of a C-terminal cytosolic protease domain and a highly hydrophobic N-terminal domain. It is assumed that the latter is composed of three trans-membrane segments (TMS) that tightly attach NS2 to intracellular membranes. Taking advantage of a system to study HCV assembly in a hepatoma cell line, in this study we performed a detailed characterization of NS2 with respect to its role for virus particle assembly. In agreement with an earlier report ( Jones, C. T., Murray, C. L., Eastman, D. K., Tassello, J., and Rice, C. M. (2007) J. Virol. 81, 8374-8383 ), we demonstrate that the protease domain, but not its enzymatic activity, is required for infectious virus production. We also show that serine residue 168 in NS2, implicated in the phosphorylation and stability of this protein, is dispensable for virion formation. In addition, we determined the NMR structure of the first TMS of NS2 and show that the N-terminal segment (amino acids 3-11) forms a putative flexible helical element connected to a stable alpha-helix (amino acids 12-21) that includes an absolutely conserved helix side in genotype 1b. By using this structure as well as the amino acid conservation as a guide for a functional study, we determined the contribution of individual amino acid residues in TMS1 for HCV assembly. We identified several residues that are critical for virion formation, most notably a central glycine residue at position 10 of TMS1. Finally, we demonstrate that mutations in NS2 blocking HCV assembly can be rescued by trans-complementation.
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Affiliation(s)
- Vlastimil Jirasko
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
| | - Roland Montserret
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
| | - Nicole Appel
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
| | - Anne Janvier
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
| | - Leah Eustachi
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
| | - Christiane Brohm
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
| | - Eike Steinmann
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
| | - Thomas Pietschmann
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
| | - Francois Penin
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
| | - Ralf Bartenschlager
- Department of Molecular
Virology, University of Heidelberg, Im Neuenheimer Feld 345, 69120 Heidelberg,
Germany and Institut de Biologie et
Chimie des Protéines, UMR 5086 CNRS, Université de Lyon, IFR128
BioSciences Gerland-Lyon Sud, F-69367 Lyon Cedex 07, France
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87
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Moreau I, O'Sullivan H, Murray C, Levis J, Crosbie O, Kenny-Walsh E, Fanning LJ. Separation of Hepatitis C genotype 4a into IgG-depleted and IgG-enriched fractions reveals a unique quasispecies profile. Virol J 2008; 5:103. [PMID: 18811965 PMCID: PMC2561023 DOI: 10.1186/1743-422x-5-103] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2008] [Accepted: 09/23/2008] [Indexed: 01/25/2023] Open
Abstract
Background Hepatitis C virus (HCV) circulates in an infected individual as a heterogeneous mixture of closely related viruses called quasispecies. The E1/E2 region of the HCV genome is hypervariable (HVR1) and is targeted by the humoral immune system. Hepatitis C virions are found in two forms: antibody associated or antibody free. The objective of this study was to investigate if separation of Hepatitis C virions into antibody enriched and antibody depleted fractions segregates quasispecies populations into distinctive swarms. Results A HCV genotype 4a specimen was fractionated into IgG-depleted and IgG-enriched fractions by use of Albumin/IgG depletion spin column. Clonal analysis of these two fractions was performed and then compared to an unfractionated sample. Following sequence analysis it was evident that the antibody depleted fraction was significantly more heterogeneous than the antibody enriched fraction, revealing a unique quasispecies profile. An in-frame 3 nt insertion was observed in 26% of clones in the unfractionated population and in 64% of clones in the IgG-depleted fraction. In addition, an in-frame 3 nt indel event was observed in 10% of clones in the unfractionated population and in 9% of clones in the IgG-depleted fraction. Neither of these latter events, which are rare occurrences in genotype 4a, was identified in the IgG-enriched fraction. Conclusion In conclusion, the homogeneity of the IgG-enriched species is postulated to represent a sequence that was strongly recognised by the humoral immune system at the time the sample was obtained. The heterogeneous nature of the IgG-depleted fraction is discussed in the context of humoral escape.
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Affiliation(s)
- Isabelle Moreau
- Department of Medicine, Molecular Virology Diagnostic & Research Laboratory, Clinical Sciences Building, Cork University Hospital, Cork, Ireland.
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88
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Sentandreu V, Jiménez-Hernández N, Torres-Puente M, Bracho MA, Valero A, Gosalbes MJ, Ortega E, Moya A, González-Candelas F. Evidence of recombination in intrapatient populations of hepatitis C virus. PLoS One 2008; 3:e3239. [PMID: 18800167 PMCID: PMC2528950 DOI: 10.1371/journal.pone.0003239] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Accepted: 08/03/2008] [Indexed: 02/07/2023] Open
Abstract
Hepatitis C virus (HCV) is a major cause of liver disease worldwide and a potential cause of substantial morbidity and mortality in the future. HCV is characterized by a high level of genetic heterogeneity. Although homologous recombination has been demonstrated in many members of the family Flaviviridae, to which HCV belongs, there are only a few studies reporting recombination on natural populations of HCV, suggesting that these events are rare in vivo. Furthermore, these few studies have focused on recombination between different HCV genotypes/subtypes but there are no reports on the extent of intra-genotype or intra-subtype recombination between viral strains infecting the same patient. Given the important implications of recombination for RNA virus evolution, our aim in this study has been to assess the existence and eventually the frequency of intragenic recombination on HCV. For this, we retrospectively have analyzed two regions of the HCV genome (NS5A and E1-E2) in samples from two different groups: (i) patients infected only with HCV (either treated with interferon plus ribavirin or treatment naïve), and (ii) HCV-HIV co-infected patients (with and without treatment against HIV). The complete data set comprised 17712 sequences from 136 serum samples derived from 111 patients. Recombination analyses were performed using 6 different methods implemented in the program RDP3. Recombination events were considered when detected by at least 3 of the 6 methods used and were identified in 10.7% of the amplified samples, distributed throughout all the groups described and the two genomic regions studied. The resulting recombination events were further verified by detailed phylogenetic analyses. The complete experimental procedure was applied to an artificial mixture of relatively closely viral populations and the ensuing analyses failed to reveal artifactual recombination. From these results we conclude that recombination should be considered as a potentially relevant mechanism generating genetic variation in HCV and with important implications for the treatment of this infection.
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Affiliation(s)
- Vicente Sentandreu
- Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València Valencia, Spain
| | - Nuria Jiménez-Hernández
- Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València Valencia, Spain
- CIBER Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain
| | - Manuela Torres-Puente
- Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València Valencia, Spain
| | - María Alma Bracho
- Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València Valencia, Spain
- CIBER Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain
| | - Ana Valero
- Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València Valencia, Spain
| | - María José Gosalbes
- Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València Valencia, Spain
- CIBER Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain
| | - Enrique Ortega
- Unidad de Enfermedades Infecciosas, Hospital General Universitario, Valencia, Spain
| | - Andrés Moya
- Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València Valencia, Spain
- CIBER Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain
| | - Fernando González-Candelas
- Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València Valencia, Spain
- CIBER Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain
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89
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Gottwein JM, Bukh J. Cutting the gordian knot-development and biological relevance of hepatitis C virus cell culture systems. Adv Virus Res 2008; 71:51-133. [PMID: 18585527 DOI: 10.1016/s0065-3527(08)00002-x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Worldwide approximately 180 million people are chronically infected with hepatitis C virus (HCV). HCV isolates exhibit extensive genetic heterogeneity and have been grouped in six genotypes and various subtypes. Additionally, several naturally occurring intergenotypic recombinants have been described. Research on the viral life cycle, efficient therapeutics, and a vaccine has been hampered by the absence of suitable cell culture systems. The first system permitting studies of the full viral life cycle was intrahepatic transfection of RNA transcripts of HCV consensus complementary DNA (cDNA) clones into chimpanzees. However, such full-length clones were not infectious in vitro. The development of the replicon system and HCV pseudo-particles allowed in vitro studies of certain aspects of the viral life cycle, RNA replication, and viral entry, respectively. Identification of the genotype 2 isolate JFH1, which for unknown reasons showed an exceptional replication capability and resulted in formation of infectious viral particles in the human hepatoma cell line Huh7, led in 2005 to the development of the first full viral life cycle in vitro systems. JFH1-based systems now enable in vitro studies of the function of viral proteins, their interaction with each other and host proteins, new antivirals, and neutralizing antibodies in the context of the full viral life cycle. However, several challenges remain, including development of cell culture systems for all major HCV genotypes and identification of other susceptible cell lines.
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Affiliation(s)
- Judith M Gottwein
- Copenhagen Hepatitis C Program (CO-HEP), Department of Infectious Diseases and Clinical Research Centre, Copenhagen University Hospital, Hvidovre, Denmark
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90
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Abstract
Hepatitis C virus (HCV) replicates its genome in a membrane-associated replication complex (RC). Specific membrane alterations, designated membranous webs, represent predominant sites of HCV RNA replication. The principles governing HCV RC and membranous web formation are poorly understood. Here, we used replicons harboring a green fluorescent protein (GFP) insertion in nonstructural protein 5A (NS5A) to study HCV RCs in live cells. Two distinct patterns of NS5A-GFP were observed. (i) Large structures, representing membranous webs, showed restricted motility, were stable over many hours, were partitioned among daughter cells during cell division, and displayed a static internal architecture without detectable exchange of NS5A-GFP. (ii) In contrast, small structures, presumably representing small RCs, showed fast, saltatory movements over long distances. Both populations were associated with endoplasmic reticulum (ER) tubules, but only small RCs showed ER-independent, microtubule (MT)-dependent transport. We suggest that this MT-dependent transport sustains two distinct RC populations, which are both required during the HCV life cycle.
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91
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Xia X, Lu L, Tee KK, Zhao W, Wu J, Yu J, Li X, Lin Y, Mukhtar MM, Hagedorn CH, Takebe Y. The unique HCV genotype distribution and the discovery of a novel subtype 6u among IDUs co-infected with HIV-1 in Yunnan, China. J Med Virol 2008; 80:1142-52. [PMID: 18461611 DOI: 10.1002/jmv.21204] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The Yunnan province is the epicenter of HIV-1 epidemics in China and a center for drug trafficking to the other parts of the world. In six prefectures of this province, a total of 132 IDUs were recruited to determine the sero-prevalence of HCV and HIV-1 and the positive rates were 93.94% and 68.18%, respectively (P<0.001). Co-infection with HCV and HIV-1 was found among 89 IDUs, of whom several HCV fragments were amplified and sequenced. Sequences of the HCV 5'NCR-C and NS5B region were determined from 82 IDUs. Phylogenetic analyses showed consistent genotyping among 80 IDUs. Among them HCV genotypes 1a, 1b, 3a, 3b, 6a, 6n, and a tentatively assigned novel 6u subtype were found in 1 (1.25%), 16 (20%), 19 (23.75%), 24 (30%), 4 (5%), 9 (11.25%) and 7 (8.75%) individuals, respectively. In two IDUs, genotyping results were discordant, suggesting mixed HCV infections or recombination. The proportion of patients with HCV 1b tended to decrease from the north to south and from the east to west in this province. Genotype 3 and 6 strains were more frequent in the southern prefectures. The novel subtype 6u strains were only detected in Dehong which borders Myanmar. Our findings showed a unique pattern of HCV genotype distribution, which is similar to that in the southeastern Asian countries but distinct from that among the general population in China. Routes of drug trafficking and the resulting high prevalence of HIV-1 infection may have contributed to this pattern of HCV genotype distribution.
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Affiliation(s)
- Xueshan Xia
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan, China.
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92
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Kuntzen T, Berical A, Ndjomou J, Bennett P, Schneidewind A, Lennon N, Birren BW, Kuiken C, Henn MR, Simmonds P, Allen TM. A set of reference sequences for the hepatitis C genotypes 4d, 4f, and 4k covering the full open reading frame. J Med Virol 2008; 80:1370-8. [PMID: 18551618 PMCID: PMC2818806 DOI: 10.1002/jmv.21240] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Infection with genotype 4 of the Hepatitis C virus is common in Africa and the Mediterranean area, but has also been found at increasing frequencies in injection drug users in Europe and North America. Full length viral sequences to characterize viral diversity and structure have recently become available mostly for subtype 4a, and studies in Egypt and Saudi Arabia, where high proportions of subtype 4a infected patients exist, have begun to establish optimized treatment regimens. However knowledge about other subtype variants of genotype 4 present in less developed African states is lacking. In this study the full coding region from so far poorly characterized variants of HCV genotype 4 was amplified and sequenced using a long range PCR technique. Sequences were analyzed with respect to phylogenetic relationship, possible recombination and prominent sequence characteristics compared to other known HCV strains. We present for the first time two full-length sequences from the HCV genotype 4k, in addition to five strains from HCV genotypes 4d and 4f. Reference sequences for accurate HCV genotyping are required for optimized treatment, and a better knowledge of the global viral sequence diversity is needed to guide vaccines or new drugs effective in the world wide epidemic.
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Affiliation(s)
- Thomas Kuntzen
- Partners AIDS Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.
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93
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Noppornpanth S, Poovorawan Y, Lien TX, Smits SL, Osterhaus ADME, Haagmans BL. Complete genome analysis of hepatitis C virus subtypes 6t and 6u. J Gen Virol 2008; 89:1276-1281. [PMID: 18420806 DOI: 10.1099/vir.0.83593-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Hepatitis C virus (HCV) genomes exhibit high nucleotide sequence diversity. In this study, we performed complete genome sequence analysis of 11 HCV genotype 6 samples from Vietnam and Thailand. We identified nine HCV complete genomes belonging to subtypes 6a (D9), 6e (D42 and D88), 6f (TH52), 6i (TH24), 6l (D33), 6n (TH22 and TH31) and 6o (D85). Phylogenetic analysis of the core/E1 and NS5B regions from unclassified genotype 6 isolates from Asian immigrants in Canada revealed that two other viruses (D49 and D83) could be classified as novel candidates of HCV subtypes 6t and 6u.
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Affiliation(s)
- Suwanna Noppornpanth
- Department of Virology, Erasmus Medical Center, Dr Molewaterplein 50, 3015 GE Rotterdam, The Netherlands
| | - Yong Poovorawan
- Center of Excellence in Viral Hepatitis Research, Department of Pediatrics, Chulalongkorn Hospital, Bangkok, Thailand
| | - Truong Xuan Lien
- Department of Biological Analysis, Pasteur Institute Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Saskia L Smits
- Department of Virology, Erasmus Medical Center, Dr Molewaterplein 50, 3015 GE Rotterdam, The Netherlands
| | - Albert D M E Osterhaus
- Department of Virology, Erasmus Medical Center, Dr Molewaterplein 50, 3015 GE Rotterdam, The Netherlands
| | - Bart L Haagmans
- Department of Virology, Erasmus Medical Center, Dr Molewaterplein 50, 3015 GE Rotterdam, The Netherlands
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94
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Kurbanov F, Tanaka Y, Avazova D, Khan A, Sugauchi F, Kan N, Kurbanova-Khudayberganova D, Khikmatullaeva A, Musabaev E, Mizokami M. Detection of hepatitis C virus natural recombinant RF1_2k/1b strain among intravenous drug users in Uzbekistan. Hepatol Res 2008; 38:457-64. [PMID: 18034826 DOI: 10.1111/j.1872-034x.2007.00293.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
AIM A series of recent studies have indicated the presence of natural intergenotypic recombinant hepatitis C virus (HCV) strains in distinct parts of the world. The majority of the current genotyping methods are based on analysis of either 5'UTR, structural (Core/E1/E2) or non-structural (NS5B) genomic regions of the virus. METHODS In the present study, based on both structural and non-structural regions, we determined the genotype of 55 anti-HCV-positive intravenous drug users (IDUs) in Uzbekistan. RESULTS HCV-3a (67.3%) was the most prevalent genotype in this cohort, followed by HCV-1b (27.3%). A discrepancy in results was observed between structural and non-structural regions in one case (1.8%). Phylogenetically this strain was related to the previously reported RF1_2k/1b variant. Based on accumulated sequences, specific primers were designed for polymerase chain reaction (PCR) spanning the tentative intergenotypic crossover point of RF1_2k/1b. The sensitivity and specificity of the method were assessed using generated template clones of HCV-1b, 2a, 2 k and RF1_2k/1b. The method was applied to 55 cases in the present study and only one case showed a positive result, indicating that in these individuals, the variant is not present as a minor quasispecies clone. CONCLUSION In conclusion, the finding of RF1_2k/1b in Central Asia indicates that the variant has wide geographic distribution. The PCR-based screening method developed in this study should be useful in further epidemiological and clinical studies on the recombination phenomenon in HCV.
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Affiliation(s)
- Fuat Kurbanov
- Department of Clinical Molecular Informative Medicine, Nagoya City University Graduate School of Medical Sciences, Kawasumi, Nagoya, Japan, and National Reference Laboratory and Research Institute of Virology, Ministry of Public Health, Tashkent, Uzbekistan
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95
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Chen SP, Yu M, Jiang T, Deng YQ, Qin CF, Han JF, Qin ED. Identification of a recombinant dengue virus type 1 with 3 recombination regions in natural populations in Guangdong province, China. Arch Virol 2008; 153:1175-9. [PMID: 18446424 PMCID: PMC7087008 DOI: 10.1007/s00705-008-0090-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Accepted: 03/20/2008] [Indexed: 11/25/2022]
Abstract
Using recombination analysis, we identified a recombinant dengue virus type 1 strain, namely, GD23/95, with three recombination regions, located within the sequences of the prM/E junction, NS1, and NS3, respectively. The recombinant dengue virus was further confirmed by phylogenetic analysis based on its recombination and non-recombination regions. This appears to be the first study to confirm the existence of three recombination regions in a single dengue virus isolate and to report recombination between parent virus strains isolated from the same geographic area (Guangdong province, China). It is also the first to report breakpoints within the NS3 gene of dengue viruses.
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Affiliation(s)
- S.-P. Chen
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongdajie Street, Fengtai District, Beijing, 100071 China
| | - M. Yu
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongdajie Street, Fengtai District, Beijing, 100071 China
| | - T. Jiang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongdajie Street, Fengtai District, Beijing, 100071 China
| | - Y.-Q. Deng
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongdajie Street, Fengtai District, Beijing, 100071 China
| | - C.-F. Qin
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongdajie Street, Fengtai District, Beijing, 100071 China
| | - J.-F. Han
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongdajie Street, Fengtai District, Beijing, 100071 China
| | - E.-D. Qin
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, No. 20 Dongdajie Street, Fengtai District, Beijing, 100071 China
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96
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Development of JFH1-based cell culture systems for hepatitis C virus genotype 4a and evidence for cross-genotype neutralization. Proc Natl Acad Sci U S A 2008; 105:997-1002. [PMID: 18195353 DOI: 10.1073/pnas.0711044105] [Citation(s) in RCA: 159] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Efficient in vitro systems to study the life cycle of hepatitis C virus (HCV) were recently developed for JFH1 (genotype 2a), which has unique replication capacity in Huh7 cells. We developed 4a/JFH1 intergenotypic recombinants containing the structural genes (Core, E1, and E2), p7, and all or part of NS2 of the 4a prototype strain ED43 that, after transfection of Huh7.5 cells with RNA transcripts, produced infectious viruses. Compared with the J6/JFH control virus, production of viruses was delayed. However, efficient spread of infection and high HCV RNA and infectivity titers were obtained in serial passages. Sequence analysis of recovered viruses and subsequent reverse genetic studies revealed a vital dependence on one or two NS2 mutations, depending on the 4a/2a junction. Infectivity of ED43/JFH1 viruses was CD81 dependent. The genotype 4 cell culture systems permit functional analyses as well as drug and vaccine research on an increasingly important genotype in the Middle East, Africa, and Europe. We also developed genotype 1a intergenotypic recombinants from H77C with vital mutations in NS3. Using H77C/JFH1 and ED43/JFH1 viruses, we demonstrated high homologous neutralizing antibody titers in 1a and 4a patient sera, respectively. Furthermore, availability of JFH1 viruses with envelope proteins of the six major HCV genotypes permitted cross-neutralization studies; 1a and 4a serum cross-neutralized 1a, 4a, 5a, and 6a but not 2a and 3a viruses. Thus, the JFH1 intergenotypic recombinants will be of importance for future studies of HCV neutralization and accelerate the development of passive and active immunoprophylaxis.
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97
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Esteban JI, Sauleda S, Quer J. The changing epidemiology of hepatitis C virus infection in Europe. J Hepatol 2008; 48:148-62. [PMID: 18022726 DOI: 10.1016/j.jhep.2007.07.033] [Citation(s) in RCA: 334] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2007] [Accepted: 07/30/2007] [Indexed: 02/07/2023]
Abstract
The epidemic of hepatitis C virus (HCV) infection in Europe is continuously evolving and epidemiological parameters (prevalence, incidence, disease transmission patterns and genotype distribution) have changed substantially during the last 15 years. Four main factors contribute to such changes: increased blood transfusion safety, improvement of healthcare conditions, continuous expansion of intravenous drug use and immigration to Europe from endemic areas. As a result, intravenous drug use has become the main risk factor for HCV transmission, prevalent infections have increased and genotype distribution has changed and diversified. Hence, prevalence data from studies conducted a decade ago may not be useful to estimate the current and future burden of HCV infection and additional epidemiological studies should be conducted, as well as new preventive strategies implemented to control the silent epidemic. This review summarizes recently published data on the epidemiology of HCV infection in Europe focusing on the factors currently shaping the epidemic.
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Affiliation(s)
- Juan I Esteban
- Liver Unit, Department of Medicine, Hospital Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Spain.
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Aaskov J, Buzacott K, Field E, Lowry K, Berlioz-Arthaud A, Holmes EC. Multiple recombinant dengue type 1 viruses in an isolate from a dengue patient. J Gen Virol 2007; 88:3334-3340. [PMID: 18024903 PMCID: PMC2884982 DOI: 10.1099/vir.0.83122-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2007] [Accepted: 07/27/2007] [Indexed: 11/29/2022] Open
Abstract
Between 2000 and 2004, dengue virus type 1 (DENV-1) genotypes I and II from Asia were introduced into the Pacific region and co-circulated in some localities. Envelope protein gene sequences of DENV-1 from 12 patients infected on the island of New Caledonia were obtained, five of which carried genotype I viruses and six, genotype II viruses. One patient harboured a mixed infection, containing viruses assigned to both genotypes I and II, as well as a number of inter-genotypic recombinants. This is the first report of a population of dengue viruses isolated from a patient containing both parental and recombinant viruses.
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Affiliation(s)
- John Aaskov
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Katie Buzacott
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Emma Field
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | - Kym Lowry
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
| | | | - Edward C. Holmes
- Center for Infectious Disease Dynamics, Department of Biology, The Pennsylvania State University, Mueller Laboratory, University Park, PA 16802, USA
- Fogarty International Center, National Institutes of Health, Bethesda, MD 20892, USA
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99
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Towards a better resolution of hepatitis C virus variants: CLIP sequencing of an HCV core fragment and automated assignment of genotypes and subtypes. J Virol Methods 2007; 148:25-33. [PMID: 18053586 DOI: 10.1016/j.jviromet.2007.10.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2007] [Revised: 09/20/2007] [Accepted: 10/10/2007] [Indexed: 01/31/2023]
Abstract
Commercially available assays for typing of hepatitis C virus (HCV) isolates satisfy the current clinical needs. They are, however, limited in their ability to identify the multitude of existing HCV subtypes correctly. Therefore, these kits should only be used cautiously in epidemiological studies and will also not meet future clinical demands which might arise, e.g., from the application of HCV subtype-specific antiviral compounds. In an attempt to overcome the drawbacks of commercial typing procedures based on the analysis of the 5' untranslated region (5' UTR), an approach was developed which relies on CLIP sequencing of an HCV core fragment with automated assignments of types and subtypes via an originally created "core-specific" sequence database. The performance characteristics of the new technique were evaluated in comparison to the Trugene 5' NC Genotyping Kit. The core-based sequencing method could regularly detect HCV isolates of genotypes 1-6 with an analytical sensitivity of 5000 IU/ml. The accuracy of typing results obtained by the Trugene test was 97% (genotypes) and 81% (subtypes). The core-linked approach classified all HCV strains correctly on the level of genotypes and led to an adequate subtype assignment in 96% of all cases. This analytical performance characteristics recorded for the newly devised typing technique was superior to those reported for all commercially available assays, including a most recently released new generation of the line probe assay. Consequently, CLIP sequencing of an HCV core fragment with subsequent automated assignment of types and subtypes can be confidently used in clinical laboratory practice to answer current and also future questions in the context of HCV typing.
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100
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Noppornpanth S, Smits SL, Lien TX, Poovorawan Y, Osterhaus ADME, Haagmans BL. Characterization of hepatitis C virus deletion mutants circulating in chronically infected patients. J Virol 2007; 81:12496-503. [PMID: 17728237 PMCID: PMC2168980 DOI: 10.1128/jvi.01059-07] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Hepatitis C virus (HCV) has a linear positive-stranded RNA genome of approximately 9,600 nucleotides in length and displays a high level of sequence diversity caused by high mutation rates and recombination. However, when we performed long distance reverse transcription-PCRs on HCV RNA isolated from serum of chronic HCV patients, not only full-length HCV genomes but also HCV RNAs which varied in size from 7,600 to 8,346 nucleotides and contained large in-frame deletions between E1 and NS2 were amplified. Carefully designed control experiments indicated that these deletion mutants are a bona fide natural RNA species, most likely packaged in virions. Moreover, deletion mutants were detected in sera of patients infected with different HCV genotypes. We observed that 7/37 (18.9%) of genotype 1, 5/43 (11.6%) of genotype 3, and 4/13 (30.7%) of genotype 6 samples contained HCV deletion mutant genomes. These observations further exemplify HCV's huge genetic diversity and warrant studies to explore their biological relevance.
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Affiliation(s)
- Suwanna Noppornpanth
- Department of Virology, Erasmus Medical Center, Dr Molewaterplein 50, 3015 GE, Rotterdam, The Netherlands
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