MERS coronaviruses from camels in Africa exhibit region-dependent genetic diversity

MERS coronaviruses from camels in Africa exhibit region-dependent genetic diversity. Chu Daniel K.W., Hui Kenrie P.Y., Perera Ranawaka A.P.M., Miguel Eve, Niemeyer Daniela, Zhao Jincun, Channappanavar Rudragouda, Dudas Gytis, Oladipo Jamiu O., Traore Amadou, Fassi-Fihri Ouafaa, Ali Abraham, Demissie Getnet Fekadu, Muth Doreen, Chan Michael C.W., Nicholls John M., Meyerholz David K., Kuranga Sulyman A., Mamo Gezahegne, Zhou Ziqi, So Ray T.Y., Hemida Maged G., Webby Richard J., Roger François, Rambaut Andrew, Poon Leo L.M., Perlman Stanley, Drosten Christian, Chevalier Véronique, Peiris Malik. 2018. Proceedings of the National Academy of Sciences, e201718769 (6 p.)

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Article de revue ; Article de revue à facteur d'impact

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Economie-gestion; Psychologie-éthologie-ergonomie

Note générale : Jeux de données : GenBank accession nos: MG923465–MG923481

Résumé : Middle East respiratory syndrome coronavirus (MERS-CoV) causes a zoonotic respiratory disease of global public health concern, and dromedary camels are the only proven source of zoonotic infection. Although MERS-CoV infection is ubiquitous in dromedaries across Africa as well as in the Arabian Peninsula, zoonotic disease appears confined to the Arabian Peninsula. MERS-CoVs from Africa have hitherto been poorly studied. We genetically and phenotypically characterized MERS-CoV from dromedaries sampled in Morocco, Burkina Faso, Nigeria, and Ethiopia. Viruses from Africa (clade C) are phylogenetically distinct from contemporary viruses from the Arabian Peninsula (clades A and B) but remain antigenically similar in microneutralization tests. Viruses from West (Nigeria, Burkina Faso) and North (Morocco) Africa form a subclade, C1, that shares clade-defining genetic signatures including deletions in the accessory gene ORF4b. Compared with human and camel MERS-CoV from Saudi Arabia, virus isolates from Burkina Faso (BF785) and Nigeria (Nig1657) had lower virus replication competence in Calu-3 cells and in ex vivo cultures of human bronchus and lung. BF785 replicated to lower titer in lungs of human DPP4-transduced mice. A reverse genetics-derived recombinant MERS-CoV (EMC) lacking ORF4b elicited higher type I and III IFN responses than the isogenic EMC virus in Calu-3 cells. However, ORF4b deletions may not be the major determinant of the reduced replication competence of BF785 and Nig1657. Genetic and phenotypic differences in West African viruses may be relevant to zoonotic potential. There is an urgent need for studies of MERS-CoV at the animal–human interface. Middle East respiratory syndrome (MERS) remains a disease of global public health concern (1). Many human infections are zoonotic in origin, but some result from clusters of human-to-human transmission, especially within hospitals and health care facilities (2). Zoonotic disease has been reported from the Arabian Peninsula, and dromedary camels are the only confirmed source of zoonotic infection (3). Although MERS-coronavirus (MERS-CoV) is also endemic in dromedaries in Africa, where the majority of dromedary camels are found (4⇓⇓–7), zoonotic infections have not been reported from Africa. Hypotheses for this pattern of zoonotic disease include genetic differences in the viruses; cultural, behavioral, or dietary differences in interactions between humans and camels and camel products; or unnoticed human cases through lack of awareness and surveillance in African countries. Data on phylogenetic and phenotypic characterization of MERS-CoV from Africa are limited. We previously reported that MERS-CoV from Egypt and Nigeria appear to be phylogenetically distinct from those currently circulating in the Arabian Peninsula (5, 6). We now report a comprehensive genetic and phenotypic analysis of MERS-CoV from North (Morocco), West (Nigeria, Burkina Faso), and East (Ethiopia) Africa compared with viruses from the Arabian Peninsula. (Résumé d'auteur)

Mots-clés géographiques Agrovoc : Afrique

Classification Agris : L73 - Maladies des animaux

Auteurs et affiliations

  • Chu Daniel K.W., University of Hong Kong (CHN)
  • Hui Kenrie P.Y., University of Hong Kong (CHN)
  • Perera Ranawaka A.P.M., University of Hong Kong (CHN)
  • Miguel Eve, IRD (FRA)
  • Niemeyer Daniela, Charite-Universitätsmedizin Berlin (DEU)
  • Zhao Jincun, University of Iowa (USA)
  • Channappanavar Rudragouda, University of Iowa (USA)
  • Dudas Gytis, Fred Hutchinson Cancer Research Center (USA)
  • Oladipo Jamiu O., University of Hong Kong (CHN)
  • Fassi-Fihri Ouafaa, IAV Hassan II (MAR)
  • Ali Abraham, Ethiopian Public Health Institute (ETH)
  • Demissie Getnet Fekadu, CIRAD-BIOS-UMR ASTRE (FRA)
  • Muth Doreen, Charite-Universitätsmedizin Berlin (DEU)
  • Chan Michael C.W., University of Hong Kong (CHN)
  • Nicholls John M., University of Hong Kong (CHN)
  • Meyerholz David K., University of Iowa (USA)
  • Kuranga Sulyman A., University of Ilorin (NGA)
  • Mamo Gezahegne, Addis Ababa University (ETH)
  • Zhou Ziqi, University of Hong Kong (CHN)
  • So Ray T.Y., University of Hong Kong (CHN)
  • Hemida Maged G., King Faisal University (SAU)
  • Webby Richard J., St Jude Children's Research Hospital (USA)
  • Roger François, CIRAD-BIOS-UMR ASTRE (THA)
  • Rambaut Andrew, University of Edinburgh (GBR)
  • Poon Leo L.M., University of Hong Kong (CHN)
  • Perlman Stanley, University of Iowa (USA)
  • Drosten Christian, Charite-Universitätsmedizin Berlin (DEU)
  • Chevalier Véronique, CIRAD-BIOS-UMR ASTRE (KHM)
  • Peiris Malik, University of Hong Kong (CHN)

Source : Cirad-Agritrop

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