MEM INST OSWALDO CRUZ, RIO DE JANEIRO, 111(2) February 2016
PAGES: 141-143 DOI: 10.1590/0074-02760150416 Genome announcement and Highlights
Complete genome of a dengue virus serotype 4 strain from Amazonas, Brazil

Valdinete Alves do Nascimento1,2, Victor Costa de Souza1, Felipe Gomes Naveca1,+

1Fundação Oswaldo Cruz, Instituto Leônidas e Maria Deane, Manaus, AM, Brasil
2Universidade Federal do Amazonas, Programa de Pós-Graduação em Saúde, Sociedade e Endemias na Amazônia, Manaus, AM, Brasil

Abstract

Dengue virus (DENV) infections represent a significant concern for public health worldwide, being considered as the most prevalent arthropod-borne virus regarding the number of reported cases. In this study, we report the complete genome sequencing of a DENV serotype 4 isolate, genotype II, obtained in the city of Manaus, directly from the serum sample, applying Ion Torrent sequencing technology. The use of a massive sequencing technology allowed the detection of two variable sites, one in the coding region for the viral envelope protein and the other in the nonstructural 1 coding region within viral populations.

Dengue fever is considered one of the most significant public health issues worldwide, being endemic in more than 100 countries (WHO 2014). The etiologic agent of dengue fever, dengue virus (DENV), belongs to the genus Flavivirus, family Flaviviridae. Four distinct serotypes denoted DENV-1 to DENV-4 are recognised (Gubler 1998), and each serotype may be further separated into different genotypes. To DENV-4, four genotypes have been described (Klungthong et al. 2004, Weaver & Vasilakis 2009).

In Brazil, the first reported cases of the disease occurred in the city of Boa Vista, state of Roraima, during an outbreak in 1982 by serotypes DENV-1 and DENV-4 (Travassos da Rosa et al. 1982). Nevertheless, the first recognised dengue epidemics in Manaus, the capital of state of Amazonas (AM), were reported during 1998-1999 (de Figueiredo et al. 2004). Unlike the other serotypes, DENV-4 was not detected again in Brazil until 2008, when it was reported in autochthonous cases occurring in AM (de Figueiredo et al. 2008).

In this paper, we report the complete genome sequencing of a DENV-4 sample, named as BR005AM_2011, one of the first samples of the genotype II identified in AM. The present data was obtained by next-generation sequencing on Ion Torrent Personal Genome Machine (PGM).

Firstly, a serum sample was submitted to total RNA extraction and complementary DNA synthesis followed by a semi-nested polymerase chain reaction (PCR) protocol (Lanciotti et al. 1992) to confirm the DENV-4 serotype. After that, the whole genome was amplified using eight sets of primers to generate overlapping amplicons spanning the entire viral genome (Naveca et al. 2012).

The library for Ion Torrent - PGM System was prepared from an equimolar solution of eight sets of amplicons generated by the PCR reaction. Further, those amplicons were enzymatically cleaved and barcoded adapters were linked to DNA fragments, generating the libraries. Moreover, libraries were amplified by emulsion PCR with ION PGM Template OT2 200 kit.

Sequencing was performed on a 314v2 chip generating 954,446 reads. After quality analysis, 484,647 reads were used for assembly, with an average size of 221 bases. The reads were analysed on Geneious Pro 7.1.0 (Biomatters, Ltd), employing Geneious's map to reference assembler tool, with 10 interactions and DENV-4 reference sequence, available in GenBank under accession NC_002640.1.

The whole genome of the BR005AM_2011 sample, containing 10,649 nucleotides with 47.2% of GC content, was obtained with a mean coverage of 1,181x. In addition to consensus sequence, the next-generation sequencing allowed to analyse the existence of variable sites in subpopulations within sequences that differ from the consensus sequence, which may aid in studies of viral evolution. We also determinate the full-genome sequence of BR005AM_2011 by capillary sequencing and no differences were found regarding to the consensus sequence.

Analysis of variable sites was held at Geneious Pro 7.1.0 with the Variations/SNPs tool using the criteria of minimum coverage 250x and minimum variant frequency of 0.1%. The analysis showed the existence of two variable sites, one at the coding region of the viral envelope protein and the other in the nonstructural 1 coding region (Table).

The viral genotype was characterised by phylogenetic analysis of the complete genome, using the neighbor-joining method and the Tamura-Nei genetic distance model. A data set of DENV-4 complete genomes encompassing representatives for each genotype was used as a reference (Figure). The BR005AM_2011 sequence was grouped with others DENV-4, genotype II, which were detected in Venezuela and Colombia.

In summary, the approach applied in the present study using Ion Torrent semiconductor sequencing may be easily used to obtain the complete genome of dengue or any other virus with similar genome size. Furthermore, several samples can be sequenced together and in-depth coverage, allowing a variety of analyses that may help understand the mechanisms related to viral evolution.

The whole genome of DENV-4 isolate BR005AM_2011 is available in GenBank under accession KT794007.

 

ACKNOWLEDGEMENTS

To the PDTIS-Fiocruz, for use of its facilities.

 

REFERENCES

de Figueiredo RMP, Naveca FG, Bastos MDS, Melo MN, Viana SDS, Mourão MPG, Costa CA, Farias IP 2008. Dengue virus type 4, Manaus, Brazil. Emerg Infect Dis 14: 667-669.

de Figueiredo RMP, Thatcher BD, de Lima ML, Almeida TC, Alecrim WD, Guerra MVF 2004. Doenças exantemáticas e primeira epidemia de dengue ocorrida em Manaus, Amazonas, no período de 1998-1999. Rev Soc Bras Med Trop 37: 476-479.

Gubler DJ 1998. Dengue and dengue hemorrhagic fever. Clin Microbiol Rev 11: 480-496.

Klungthong C, Zhang C, Mammen MP, Ubol S, Holmes EC 2004. The molecular epidemiology of dengue virus serotype 4 in Bangkok, Thailand. Virology 329: 168-179.

Lanciotti RS, Calisher CH, Gubler DJ, Chang GJ, Vorndam A V 1992. Rapid detection and typing of dengue viruses from clinical samples by using reverse transcriptase-polymerase chain reaction. J Clin Microbiol 30: 545-551.

Naveca FG, Souza VC, Silva GAV, Maito RM, Granja F, Siqueira T, Acosta PO 2012. Complete genome sequence of a dengue virus serotype 4 strain isolated in Roraima, Brazil. J Virol 86: 1897-1898.

Travassos da Rosa AP, Rocha JM, Silva OV, Lins Z 1982. Surto de dengue em Boa Vista, território de Roraima, Brasil. Boletim Epidemiológico (Ministério da Saúde) 14: 93-100.

Weaver SC, Vasilakis N 2009. Molecular evolution of dengue viruses: contributions of phylogenetics to understanding the history and epidemiology of the preeminent arboviral disease. Infect Genet Evol 9: 523-540.

WHO - World Health Organiztion 2014. Dengue and severe dengue. who.int/mediacentre/factsheets/fs117/en/.

 

Financial support: FIOCRUZ (PAPES VI), CAPES (to VAN)
+ Corresponding author: This e-mail address is being protected from spambots. You need JavaScript enabled to view it.
Received 29 October 2015
Accepted 12 January 2016

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