[From SARS, MERS to COVID-19: A journey to understand bat coronaviruses]
- PMID: 34075253
- PMCID: PMC8162021
- DOI: 10.1016/j.banm.2021.05.008
[From SARS, MERS to COVID-19: A journey to understand bat coronaviruses]
Abstract
From the beginning of this century, three coronaviruses (CoVs) have caused severe human respiratory diseases, including severe respiratory syndrome (SARS), Middle East respiratory syndrome (MERS) and corona virus disease 2019 (COVID-19), which outbroke in 2002-2003, 2012 and 2019-2020, respectively. These viruses are three different species belonging to Coronaviridae family, Betacoronavirus genus. Discovery of closely-related CoVs in bats indicates that bats are natural reservoirs of these viruses. How and when the bat CoVs cross-species barriers to infect humans are largely understudied. This article provides an overview of the distribution, genetic evolution and interspecies transmission of bat coronaviruses in China, particularly focusing on bat SARS-related CoVs (SARSr-CoVs). Our studies showed that SARS-related CoVs are highly prevalent in horseshoe bats and some of them use the same receptor as SARS-CoV and SARS-CoV-2 and have wide cell tissue tropism. However, these bat viruses seem to be low pathogenic in human ACE2 transgenic mice compared with the SARS-CoV-2. These results imply that these bat CoVs have potential interspecies transmission to other animals and humans. Our work highlights the necessity of preparedness for future emerging infectious diseases caused by these CoVs.
Depuis le début de ce siècle, trois coronavirus (CoV) ont provoqué des maladies respiratoires humaines graves, notamment le syndrome respiratoire aigu sévère (SRAS), le syndrome respiratoire du Moyen-Orient (MERS) et la COVID-19 (Coronavirus Disease 2019), qui sont apparues respectivement en 2002- 2003, 2012 et 2019-2020. Il s’agit de trois virus différents appartenant à la famille des Coronaviridae, genre Betacoronavirus. La découverte de CoVs étroitement apparentés chez les chauves-souris indique que ces animaux sont les réservoirs naturels de ces virus. Cependant aucune donnée actuelle ne permet de comprendre comment et quand la barrière d’espèce a été franchie à partir de la chauve-souris pour infecter l’Homme. Cet article présente une vue d’ensemble de la distribution, de l’évolution génétique et des transmissions interspécifiques des coronavirus des chauves-souris en Chine, en particulier des coronavirus apparentés au SRAS (SARS related) ou SARSr-CoV. Nos études ont montré que les SARSr-CoVs sont très répandus chez les chauves-souris fer à cheval et que certains d’entre eux utilisent le même récepteur que celui du SARS-CoV et du SARS-CoV-2 et qu’ils ont un large tropisme tissulaire. Cependant, ces virus de chauve-souris semblent être faiblement pathogènes par rapport au SARS-CoV-2 chez les souris transgéniques pour le récepteur ACE2 humain. Ces résultats montrent néanmoins que ces CoVs des chauves-souris peuvent potentiellement franchir la barrière d’espèce et se transmettre à d’autres animaux ou à l’Homme. Nos travaux mettent en évidence la nécessité de se préparer aux futures maladies infectieuses émergentes pouvant être causées par ces CoVs.
Keywords: Bat; COVID-19; Coronavirus; Emerging diseases; MERS; SARS.
© 2021 l'Académie nationale de médecine. Published by Elsevier Masson SAS. All rights reserved.
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