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Genome Sequences

Complete Genome Sequence of a Human Enterovirus C99 Strain Isolated from a Healthy Child in Yunnan, China, in 2013

Jie Zhang, Hongbo Liu, Xiaoqin Huang, Hao Sun, Zhaoqing Yang, Shaohui Ma
Christina Cuomo, Editor
Jie Zhang
Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People’s Republic of ChinaYunnan Key Laboratory of Vaccine Research Development on Severe Infectious Disease, Kunming, People’s Republic of China
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Hongbo Liu
Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People’s Republic of ChinaYunnan Key Laboratory of Vaccine Research Development on Severe Infectious Disease, Kunming, People’s Republic of China
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Xiaoqin Huang
Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People’s Republic of ChinaYunnan Key Laboratory of Vaccine Research Development on Severe Infectious Disease, Kunming, People’s Republic of China
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Hao Sun
Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People’s Republic of ChinaYunnan Key Laboratory of Vaccine Research Development on Severe Infectious Disease, Kunming, People’s Republic of China
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Zhaoqing Yang
Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People’s Republic of ChinaYunnan Key Laboratory of Vaccine Research Development on Severe Infectious Disease, Kunming, People’s Republic of China
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Shaohui Ma
Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People’s Republic of ChinaYunnan Key Laboratory of Vaccine Research Development on Severe Infectious Disease, Kunming, People’s Republic of China
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Christina Cuomo
Broad Institute of MIT and Harvard University
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DOI: 10.1128/MRA.01489-18
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ABSTRACT

The complete genome sequence of a human enterovirus C99 strain isolated from a healthy child in Yunnan, China, in 2013 was determined. The isolate belonged to genotype C, according to phylogenetic and homogeneity analyses.

ANNOUNCEMENT

Human enterovirus C99 (EV-C99) belongs to Human enterovirus C. EV-C99 is a positive-sense, single-stranded RNA virus. The genome is approximately 7.4 kb, including a 5ʹ untranslated region (UTR), structural polypeptide P1, nonstructural polypeptides P2 and P3, and a 3ʹ UTR. All EV-C99 strains can be classified into three genotypes, A, B, and C (1). EV-C99 strains have been isolated from acute flaccid paralysis (AFP) patients and from oral polio-vaccinated and healthy individuals (1–4). At present, there are very few EV-C99 sequences available in the GenBank database.

A stool sample of a healthy child in Yunnan, China, was inoculated into human embryonic lung diploid fibroblasts (KMB17) and propagated in up to three passages. The sample induced a cytopathic effect (CPE), was stored at −80°C, and was named strain K292/YN/CHN/2013. The viral RNA was extracted from cell culture supernatants using the AxyPrep body fluid viral DNA/RNA miniprep kit (Axygen, Union City, CA). Then, the partial VP1 gene was amplified using the primer pairs 222 and 224 (5) with a PrimeScript one-step reverse transcription-PCR (RT-PCR) kit v.2 (TaKaRa, Dalian, China). The primers used in this study were designed using the primer-walking strategy (6, 7), shown in Table 1. The Tsingke Sequencing Company (Kunming, China) sequenced the positive PCR products using an ABI 3730XL automatic sequencer (Applied Biosystems, Foster City, CA). In order to resolve the alignments into a consensus, DNAStar 6.0 (DNAStar, Inc., Madison, WI) was used to assemble the raw sequences using default parameters. Then, the conflicting positions were inspected manually and amended where manual inspection of the corresponding positions in the chromatograms showed a single peak. The average depth was 3×, based on the read number and length.

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TABLE 1

Primers used for RT-PCR and sequencing of the human enterovirus C99 strain K292/YN/CHN/2013 genome

Geneious Basic 5.6.5 software was used to analyze nucleic acid and protein sequence alignments. The viral genome sequence of the strain K292/YN/CHN/2013 was 7,453 nucleotides (nt) in length, excluding the poly(A) tail. The open reading frame (ORF) of the strain encodes the structural protein region P1 (2,649 nt) and the functional protein regions P2 (1,722 nt) and P3 (2,259 nt). The sequence was flanked by a 3ʹ UTR (71 nt) and a 5ʹ UTR (752 nt). The contents of A, U, G, and C were 30.2%, 24.9%, 22.3%, and 22.7%, respectively, with a GC content of 44.9%. All complete genome sequences of EV-C99 available in GenBank were identified using BLAST. The sequences were aligned using the ClustalW multiple alignment method. The strain shared 81.2 to 92.2% and 87.3 to 93.1% nucleotide similarity with other Chinese strains in the complete VP1 gene and the complete genome, respectively. The isolate was defined as an EV-C99 strain according to the enterovirus type demarcation criterion (strains with >75% nucleotide or >88% amino acid homology with VP1 sequences belong to the same serotype) (7). The strain K292/YN/CHN/2013 is assigned to genotype C, according to the results of the phylogenetic analyses (Fig. 1). In addition, similarity plot and bootscanning analysis was performed using Simplot v.3.5.1; the K292/YN/CHN/2013 strain revealed intraserotypic genetic recombination events.

FIG 1
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FIG 1

Phylogenetic analysis of EV-C99 based on complete VP1 sequences. The tree was created using the neighbor-joining method with the Kimura two-parameter model of nucleotide substitution in MEGA v.6.06, with a bootstrap value of 1,000. The tip/taxon labels include the strain names and GenBank accession numbers. The triangle indicates the strain isolated in this study, and circles indicate other Chinese isolates.

Data availability.The complete genome sequence of K292/YN/CHN/2013 has been deposited in GenBank under the accession no. KT946713.

ACKNOWLEDGMENTS

Funding for this research was provided by Yunnan Provincial Science and Technology Department (grant 2017FA006) and the Chinese Academy of Medical Sciences Initiative for Innovative Medicine (grant 2016-I2M-3-026).

FOOTNOTES

    • Received 2 November 2018.
    • Accepted 24 March 2019.
    • Published 18 April 2019.
  • Copyright © 2019 Zhang et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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Complete Genome Sequence of a Human Enterovirus C99 Strain Isolated from a Healthy Child in Yunnan, China, in 2013
Jie Zhang, Hongbo Liu, Xiaoqin Huang, Hao Sun, Zhaoqing Yang, Shaohui Ma
Microbiology Resource Announcements Apr 2019, 8 (16) e01489-18; DOI: 10.1128/MRA.01489-18

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Complete Genome Sequence of a Human Enterovirus C99 Strain Isolated from a Healthy Child in Yunnan, China, in 2013
Jie Zhang, Hongbo Liu, Xiaoqin Huang, Hao Sun, Zhaoqing Yang, Shaohui Ma
Microbiology Resource Announcements Apr 2019, 8 (16) e01489-18; DOI: 10.1128/MRA.01489-18
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