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SARS-Like Coronaviruses in Horseshoe Bats (Rhinolophus Spp.) in Russia, 2020

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SARS-Like Coronaviruses in Horseshoe Bats (Rhinolophus Spp.) in Russia, 2020 bioRxiv preprint doi: https://doi.org/10.1101/2021.05.17.444362; this version posted May 18, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 SARS-like coronaviruses in horseshoe bats (Rhinolophus spp.) in Russia, 2020. 2 Sergey V. Alkhovsky, Sergey V. Lenshin, Alexey V. Romashin, Tatyana V. 3 Vishnevskaya, Oleg I. Vyshemirsky, Yulia I. Bulycheva, Dmitry K. Lvov, Asya K. Gitelman. 4 5 Address for correspondence: Sergey V. Alkhovsky, N.F Gamaleya National Research 6 Center on Epidemiology and Microbiology of Ministry of health of Russian Federation, 18 7 Gamaleya street, 123098 Moscow, Russia; email: [email protected], [email protected]. 8 9 Keywords: SARS-CoV, SARS-CoV-2, bat SARS-like coronaviruses, SARS-CoV-like 10 viruses, viral metagenomics, coronavirus, horseshoe bats, zoonotic viruses, Rhinolophus. 11 12 Affiliations: 13 D.I. Ivanovsky Institute of Virology of N.F. Gamleya National Center on Epidemiology 14 and Microbiology of Ministry of Health of Russian Federation, Moscow, Russia (S. Alkhovsky, 15 D. Lvov, T. Vishnevskaya, Yu. Bulycheva, A. Gitelman); 16 Reference center on coronavirus infection of N.F. Gamleya National Center on 17 Epidemiology and Microbiology of Ministry of Health of Russian Federation, Moscow, Russia 18 (S. Alkhovsky, T. Vishnevskaya); 19 Federal State Budgetary Scientific Institution «Scientific Research Institute of Medical 20 Primatology» of Russian Academy of Science, Adler, Russia (S. Lenshin, O. Vyshemirsky); 21 Federal State Budgetary Institution «Sochi National Park», Sochi, Russia (A. Romashin) 22 23 bioRxiv preprint doi: https://doi.org/10.1101/2021.05.17.444362; this version posted May 18, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 24 Abstract 25 We found and genetically described two novel SARS-like coronaviruses in feces and oral 26 swabs of the great (R. ferrumequinum) and the lesser (R. hipposideros) horseshoe bats in 27 southern region of Russia. The viruses, named Khosta-1 and Khosta-2, together with related 28 viruses from Bulgaria and Kenya, form a separate phylogenetic lineage. We found an evidence 29 of recombination events in evolutionary history of Khosta-1, which involved the acquisition of 30 structural proteins S, E, and M as well as nonstructural genes ORF3, ORF6, ORF7a, and ORF7b 31 from a virus that is closely related to Kenyan isolate BtKY72. Examination of bats by RT-PCR 32 revealed that 62,5% of great horseshoe bats in one of the caves were positive for Khosta-1 virus 33 while its overall prevalence was 14%. The prevalence of Khosta-2 was 1,75%. Our results show 34 that SARS-like coronaviruses circulate in horseshoe bats in the region and provide a new data on 35 their genetic diversity. 36 37 Introduction 38 Horseshoe bats (Rhinolophidae: Rhinolophus) are considered as a main natural reservoir 39 and source of zoonotic coronaviruses (CoV) which caused epidemic outbreak of severe acute 40 respiratory syndrome (SARS) and COVID-19 pandemic in 2002 and 2019, respectively (1,2). 41 These viruses, designated as SARS-CoV and SARS-CoV-2, together with related viruses found 42 in bats and other animals (SARS-like coronaviruses or SARS-CoV-like viruses) belong to the 43 subgenus Sarbecovirus of the genus Betacoronavirus of the family Coronaviridae (3). Horseshoe 44 bats are wide distributed in Asia, Europe, and North Africa. In East Asia (in particular, in 45 People’s Republic of China (PRC)) SARS-CoV-like viruses circulate in multiple rhinolophid’s 46 species, however the Chinese rufous (R. sinicus), the greater (R. ferrumequinum), the bioRxiv preprint doi: https://doi.org/10.1101/2021.05.17.444362; this version posted May 18, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 47 intermediate (R. affinis), and the king (R. rex) horseshoe bats seem to be of major importance (4). 48 In Europe SARS-CoV-like viruses was found in the greater, the lesser (R. hipposideros), the 49 Miditerranean (R. euryale), Mehely’s (R. mehelyi), and Blasius’s (R. blasii) horseshoe bats (5–8). 50 The prevalence of SARS-like coronaviruses among bats in different caves-colonies can vary 51 from 0% to 60% (4,7,9,10). In Russia three species of horseshoe bats (the greater, the lesser, and 52 Miditerranean) are common in southern regions, lying below about 44º north latitude, mostly 53 including North Caucasus and Crimea. In present work we hypothesized that SARS-like 54 coronaviruses circulate in the region in local populations of horseshoe bats. To test this 55 hypothesis, we examined the colonies of bats located in the southern macroslope of the Greater 56 Caucasus on northern coast of the Black Sea in Russia. Using metagenomic analysis we found 57 and genetically described two new SARS-like coronaviruses in feces and oral swabs of the 58 greater and the lesser horseshoe bats. Further PCR analysis showed a high degree of infection of 59 bats with discovered viruses in some locations. 60 61 Materials and methods 62 The samples from bats were collected in Sochi National Park (Sochi-Adler, Krasnodar 63 krai, Russia) and surrounding areas in March-October 2020. The Sochi National Park is located 64 on southern macroslope of the Greater Caucasus descending to the northern coast of the Black 65 Sea (Figure 1). The park stuffs keep records of more than 300 karst formations (caves, breaks, 66 mines, clefts, etc.) that are natural refuges for bats and other troglophilous animal species. Bats 67 were caught by hand in eight locations including five caves as well as basements and attics of 68 houses (Table 1). The bats were caught in the frame of ongoing surveillance of bats populations 69 constantly carried out in the park. The species of the animals was determined based on their bioRxiv preprint doi: https://doi.org/10.1101/2021.05.17.444362; this version posted May 18, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 70 morphological characters by an experienced park zoologist. The length of the forearm and 71 weight of animals were measured. To collect bat oral swabs (saliva and buccal cells) an 72 urological swab was placed in the bat's mouth for 10-15 sec and then placed in 250 μl of 73 phosphate-buffered saline (PBS). To collect feces, an animal was placed in a small white cotton 74 bag for 10-15 min. After that the animal was released, and the feces were collected from the 75 walls of the bag into cryovials. No bats were harmed during sample collection. A total of 120 76 samples of oral swabs and 77 samples of feces from five species of bats were collected (Table 1). 77 The samples were delivered to the laboratory on ice and stored at -70ºC until start of research. 78 Metagenomic analysis was conduct as described anywhere. Briefly, the feces were 79 suspended and homogenized in 0,5 ml of PBS and pooled by 0,1 ml in three samples (faces from 80 20-30 animals in the pool). Pooled samples were clarified by centrifugation (10 000 g, 15 min) 81 and treated with DNase I and RNase If (NEB, Great Britain) for removing of naked out-capsid 82 nucleic acid. The viral particles were sedimented from treated samples by ultracentrifugation 83 (30 000 g, 1 h) through 2 ml of 20% sucrose. Virus plaque was resuspended in 0,5 ml PBS. Total 84 RNA was isolated from 0,25 ml of obtained solution with TRIzol LS reagent (ThermoFisher 85 Scientific, USA). 86 Total RNA from oral swabs were isolated with TRIzol LS reagent from individual samples 87 and pooled by 20 µl in five pooled samples (20-25 samples in the pool). The pooled RNA was 88 precipitated by isopropyl alcohol with addition of glycogen followed by additional clarification 89 with RNeasy MinElute Cleanup kit (Qiagen, Germany). NEBNext rRNA Depletion kit (NEB) 90 was used to remove bacterial and eukaryotic rRNA from total RNA isolated from pooled 91 samples. Treated RNA was used for cDNA library preparation by NEBNext Ultra II RNA library 92 kit for Illumina (NEB). bioRxiv preprint doi: https://doi.org/10.1101/2021.05.17.444362; this version posted May 18, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 93 The libraries were sequenced on a HiSeq4000 instrument (Illumina, USA) at the facility of 94 Resource Center “BioBank” of the Research Park of Saint Petersburg State University (Saint- 95 Petersburg, Russia). Reads were filtered by quality, trimmed to remove adapter’s sequences, and 96 assembled de novo using CLC Genomics Workbench 7.0 software (Qiagen). Obtained contig 97 sequences were analyzed using blastx algorithm by DIAMOND software (11) against nr 98 ‘Viruses’ database that included all reference viral sequences available in GenBank at December 99 2020. Nucleotide and deduced amino acid sequences were alignment by ClustalW implemented 100 in MEGAX software (12). The best substitution model was evaluated for each alignment by the 101 Model selection module in MEGAX software. Phylogenetic trees were inferred by ‘maximum 102 likelihood’ method using appropriate model with 1000 bootstrap replicates by MEGAX 103 software. Similarity plot analysis was conducted by SimPlot software (13). Possible 104 recombination was analyzed by RDP5 software (14). 105 Primers and probes for specific detection of discovered coronaviruses were developed 106 based on obtained sequences by Beacon 7.0 software (Premier Biosoft, USA).
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