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Genetic Diversity and Evolution | Spotlight

Isolation and Characterization of a Novel Bat Coronavirus Closely Related to the Direct Progenitor of Severe Acute Respiratory Syndrome Coronavirus

Xing-Lou Yang, Ben Hu, Bo Wang, Mei-Niang Wang, Qian Zhang, Wei Zhang, Li-Jun Wu, Xing-Yi Ge, Yun-Zhi Zhang, Peter Daszak, Lin-Fa Wang, Zheng-Li Shi
S. Perlman, Editor
Xing-Lou Yang
aKey Laboratory of Special Pathogens and Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
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Ben Hu
aKey Laboratory of Special Pathogens and Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
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Bo Wang
aKey Laboratory of Special Pathogens and Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
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Mei-Niang Wang
aKey Laboratory of Special Pathogens and Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
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Qian Zhang
aKey Laboratory of Special Pathogens and Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
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Wei Zhang
aKey Laboratory of Special Pathogens and Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
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Li-Jun Wu
aKey Laboratory of Special Pathogens and Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
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Xing-Yi Ge
aKey Laboratory of Special Pathogens and Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
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Yun-Zhi Zhang
bYunnan Institute of Endemic Diseases Control and Prevention, Dali, China
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Peter Daszak
cEcoHealth Alliance, New York, New York, USA
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Lin-Fa Wang
dProgram in Emerging Infectious Diseases, Duke-NUS Graduate Medical School, Singapore, Singapore
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Zheng-Li Shi
aKey Laboratory of Special Pathogens and Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
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S. Perlman
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DOI: 10.1128/JVI.02582-15
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ABSTRACT

We report the isolation and characterization of a novel bat coronavirus which is much closer to the severe acute respiratory syndrome coronavirus (SARS-CoV) in genomic sequence than others previously reported, particularly in its S gene. Cell entry and susceptibility studies indicated that this virus can use ACE2 as a receptor and infect animal and human cell lines. Our results provide further evidence of the bat origin of the SARS-CoV and highlight the likelihood of future bat coronavirus emergence in humans.

TEXT

The 2002-2003 outbreak of severe acute respiratory syndrome coronavirus (SARS-CoV) was a significant public health threat at the beginning of the 21st century (1). Initial evidences showed that the masked palm civet (Paguma larvata) was the primary suspect in the animal origin of SARS-CoV (2, 3). Later studies suggested that Chinese horseshoe bats are natural reservoirs and that the masked palm civet most likely served as an intermediate amplification host for SARS-CoV (4, 5). From our longitudinal surveillance of bat SARS-like coronavirus (SL-CoV) in a single bat colony of the species Rhinolophus sinicus in Kunming, Yunnan Province, China, we found a high prevalence of diverse SL-CoVs (6). Whole-genome sequence comparison revealed that these SL-CoVs have 78% to 95% nucleotide sequence identities to SARS-CoV, with the major differences located in the spike protein (S) genes and the region of open reading frame 8 (ORF8). We recently isolated a bat SL-CoV strain (WIV1) and constructed an infectious clone of another strain (SHC014); significantly, these strains are closely related to SARS-CoV and capable of using the same cellular receptor (angiotensin-converting enzyme 2 [ACE2]) as SARS-CoV (6, 7). Despite the high similarity in genomic sequences and receptor usage of these two strains, there is still some difference between the N-terminal domains of the S proteins of SARS-CoV and other SL-CoVs, indicating that other unknown SL-CoVs are circulating in bats.

Here we report the isolation of a new SL-CoV strain, named bat SL-CoV WIV16. SL-CoV WIV16 was isolated from a single fecal sample of Rhinolophus sinicus, which was collected in Kunming, Yunnan Province, in July 2013. The full genomic sequence of SL-CoV WIV16 (GenBank accession number KT444582) was determined and contained 30,290 nucleotides (nt) and a poly(A) tail which is slightly larger than those of SARS-CoVs and other bat SL-CoVs (6, 8–13). The WIV16 genome has a 40.9% G+C content and short untranslated regions (UTRs) of 264 and 339 nt at the 5′ and 3′ termini, respectively. Its gene organization is identical to that of WIV1 and slightly different from that of the civet SARS-CoV and other bat SL-CoVs due to an additional ORF (name ORFx) detected between the ORF6 and ORF7 genes of the WIV1 and WIV16 genomes (data not shown). The conserved transcriptional regulatory sequence was identified upstream of ORFx, indicating that this is likely to be a potential functional gene. The overall nucleotide sequence of WIV16 has 96% identity (higher than that of any previously reported bat SL-CoVs) to human and civet SARS-CoVs (Table 1) (4–6, 8–13). A detailed comparison of protein sequences between SARS-CoV GZ02, a strain from an early-phase patient, and all reported bat SL-CoVs indicated that WIV16 is the closet progenitor of the SARS-CoV in most proteins, particularly in the S protein (Table 1).

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TABLE 1

Genomic comparison of SARS-CoV GZ02 with civet SARS-CoV and other bat SL-CoVs

The S protein is responsible for virus entry and is functionally divided into two domains, denoted S1 and S2. The S1 domain is involved in receptor binding, and the S2 domain is involved in cellular membrane fusion (14). S1 is functionally subdivided into two domains, an N-terminal domain (S1-NTD) and a C-terminal domain (S1-CTD), both of which can bind to host receptors and hence function as receptor-binding domain (RBDs) (15). All isolates of SARS-CoV and SL-CoV have high identity in both their nucleotide and their amino acid sequences in the S2 region but are highly diverse in their S1 regions. The WIV16 S gene has 95% sequence identity at the nucleotide level and 97% identity at the amino acid level to SARS-CoVs, much higher than those of WIV1, which has 88% identity at the nucleotide level and 90% identity at the amino acid level. Unlike with other bat SL-CoVs, the S1-NTD of WIV16 is very similar to that of SARS-CoV (Fig. 1). The S1-NTD of WIV16 has an amino acid sequence identity to SARS-CoVs of 94% but of only 50% to 75% to other bat SL-CoVs. It is worth noting that the WIV16 RBD (amino acids [aa] 318 to 510) has 95% sequence identity to the SARS-CoV RBD but is almost identical to WIV1's. Thus, the WIV16 S gene is likely a recombinant of WIV1's gene and a recent ancestor of SARS-CoV's gene.

FIG 1
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FIG 1

Similarity plot based on the nucleotide sequence of the S gene of bat SL-CoV WIV16. S genes of human/civet SARS-CoVs and bat SL-CoV WIV1 were used as reference sequences, with a window of 200 bp and a step size of 20 bp under the Kimura model. CenterPos, center position.

High sequence conservation of the WIV16 RBD with that of SARS-CoVs predicts that WIV16 is likely also to use ACE2 as a cellular entry receptor. This was confirmed by infection of HeLa cells expressing ACE2 from human, civet, and Chinese horseshoe bat, respectively (Fig. 2A). Cell susceptibility testing using different cell lines further indicated that WIV16 has the same host range as WIV1 (Fig. 2B) (6).

FIG 2
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FIG 2

Receptor analysis (A) and susceptibility test (B) results for bat SL-CoV WIV16. (A) HeLa cells with and without the expression of ACE2. ACE2 expression was detected with goat anti-human ACE2 antibody, followed by fluorescein isothiocyanate (FITC)-conjugated donkey anti-goat IgG. Virus replication was detected with rabbit antibody against the SL-CoV Rp3 nucleocapsid protein, followed by cyanine 3 (Cy3)-conjugated mouse anti-rabbit IgG. Nuclei were stained with DAPI (4′,6-diamidino-2-phenylindole). The columns (from left to right) show staining of nuclei (blue), ACE2 expression (green), virus replication (red), and all three (merged triple-stain images). b, bat; c, civet; h, human. (B) Virus infection in A549, LLC-MK2, RSKT, PK15, H292, and Vero-E6 cells. The columns (from left to right) show staining of nuclei (blue), virus replication (red), and both nuclei and virus replication (merged double-stain images). A549 and H292, human lung cells; LLC-MK2, macaque kidney cells; RSKT, Chinese horseshoe bat kidney cells; PK15, pig kidney cells; VeroE6, African green monkey kidney cells.

To assess whether the major sequence difference of the S1-NTD will have an effect on virus entry and/or replication, the growth kinetics of the two viruses were comparatively studied. Vero E6 cells were infected with WIV1 or WIV16 at a multiplicity of infection (MOI) of 1, and virus production in the medium supernatant was determined at four time points postinfection by quantification of viral RNA (Fig. 3; see the figure legend for more technical detail). The two viruses grew at very similar rates, with WIV16's rate being slightly lower than WIV1's rate during the 48-h period examined in this study. It is hard to conclude whether this subtle difference is significant and related to the S1-NTD sequence difference. Further investigation with more cell lines is required to confirm this preliminary observation.

FIG 3
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FIG 3

One-step growth curve of bat SL-CoV WIV16 compared with that of WIV1. Vero E6 cells were infected with WIV16 or WIV1 at an MOI of 1. Supernatants were collected at 0, 12, 24, and 48 h postinfection. The viruses in the supernatant were determined by one-step reverse real-time PCR (n = 3). Virus RNA that had been extracted from a virus with a known titer was used to set up the standard curve. Error bars represent standard deviations. TCID50, 50% tissue culture infective doses.

In conclusion, we isolated and characterized a novel bat SL-CoV isolate, WIV16, which is the closest ancestor to date of the SARS-CoV. Our results provide further evidence that Chinese horseshoe bats are natural reservoirs of SARS-CoVs. It should be noted that WIV16 is not the closest strain to the human SARS-CoVs with regard to ORF8. Full-length ORF8 is present in several SARS-CoV genomes of early-phase patients, all civet SARS-CoVs, and bat SL-CoVs. It is split into two ORFs (ORF8a and -b) in most human SARS-CoVs from late-phase patients due to a deletion event in this part of the genome (3). Recently, two papers reported that they found a full-length ORF8 which has higher similarities to SARS-CoV GZ02 and civet SARS-CoV SZ3, suggesting that SAS-CoV derived from a complicated recombination and genetic evolution among different bat SL-CoVs (10, 12). Considering everything together, we predict that there are diverse SL-CoVs to be discovered in bats. Continued surveillance of this group of viruses in bats will be necessary and important not only for a better understanding of the spillover mechanism but also for more effective risk assessment and prevention of future SARS-like disease outbreaks.

Nucleotide sequence accession number.The full genomic sequence of SL-CoV WIV16 was deposited in GenBank under accession number KT444582.

FOOTNOTES

    • Received 13 October 2015.
    • Accepted 21 December 2015.
    • Accepted manuscript posted online 30 December 2015.
  • Address correspondence to Zheng-Li Shi, zlshi{at}wh.iov.cn.
  • Citation Yang X-L, Hu B, Wang B, Wang M-N, Zhang Q, Zhang W, Wu L-J, Ge X-Y, Zhang Y-Z, Daszak P, Wang L-F, Shi Z-L. 2016. Isolation and characterization of a novel bat coronavirus closely related to the direct progenitor of severe acute respiratory syndrome coronavirus. J Virol 90:3253–3256. doi:10.1128/JVI.02582-15.

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Isolation and Characterization of a Novel Bat Coronavirus Closely Related to the Direct Progenitor of Severe Acute Respiratory Syndrome Coronavirus
Xing-Lou Yang, Ben Hu, Bo Wang, Mei-Niang Wang, Qian Zhang, Wei Zhang, Li-Jun Wu, Xing-Yi Ge, Yun-Zhi Zhang, Peter Daszak, Lin-Fa Wang, Zheng-Li Shi
Journal of Virology Feb 2016, 90 (6) 3253-3256; DOI: 10.1128/JVI.02582-15

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Isolation and Characterization of a Novel Bat Coronavirus Closely Related to the Direct Progenitor of Severe Acute Respiratory Syndrome Coronavirus
Xing-Lou Yang, Ben Hu, Bo Wang, Mei-Niang Wang, Qian Zhang, Wei Zhang, Li-Jun Wu, Xing-Yi Ge, Yun-Zhi Zhang, Peter Daszak, Lin-Fa Wang, Zheng-Li Shi
Journal of Virology Feb 2016, 90 (6) 3253-3256; DOI: 10.1128/JVI.02582-15
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