Abstract

Middle East Respiratory Syndrome Coronavirus (MERS-CoV) is an emerging zoonotic virus considered as one of the major public threat with a total number of 2 298 laboratory-confirmed cases and 811 associated deaths reported by World Health Organization as of January 2019. The transmission of the virus was expected to be from the camels found in Middle Eastern countries via the animal and human interaction. The genome structure provided information about the pathogenicity and associated virulent factors present in the virus. Recent studies suggested that there were limited insight available on the development of novel therapeutic strategies to induce immunity against the virus. The severities of MERS-CoV infection highlight the necessity of effective approaches for the development of various therapeutic remedies. Thus, the present review comprehensively and critically illustrates the recent aspects on the epidemiology of the virus, the structural and functional features of the viral genome, viral entry and transmission, major mechanisms of pathogenesis and associated virulent factors, current animal models, detection methods and novel strategies for the development of vaccines against MERS-CoV. The review further illustrates the molecular and computational virtual screening platforms which provide insights for the identification of putative drug targets and novel lead molecules toward the development of therapeutic remedies.

Highlights

  • The coronaviruses such as HCoV-229E, HCoV-NL63 (α-coronavirus) and HCoV-OC43 and HKU1 (β-coronavirus) circulated in the human population and caused mild respiratory infections (Hamre and Procknow, 1966; Fouchier et al, 2004; van der Hoek et al, 2004; Woo et al, 2005)

  • Recent study revealed that the prevalence of MERS-CoV infection in camel workers was found to be very high in Saudi Arabia (Alshukairi et al, 2018)

  • This study showed that the absence of major accessory open reading frames (ORFs) such as deletion of ORF3, -4a, -4b, and -5 played major role in the viral replication and pathogenesis

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Summary

INTRODUCTION

The coronaviruses such as HCoV-229E, HCoV-NL63 (α-coronavirus) and HCoV-OC43 and HKU1 (β-coronavirus) circulated in the human population and caused mild respiratory infections (Hamre and Procknow, 1966; Fouchier et al, 2004; van der Hoek et al, 2004; Woo et al, 2005). Recent study revealed that the prevalence of MERS-CoV infection in camel workers was found to be very high in Saudi Arabia (Alshukairi et al, 2018). The first case of MERS-CoV infection was reported in Saudi Arabia in 2012 (Zaki et al, 2012). Recent statistics suggested that as of 31 December 2018, the total of 2,279 laboratory-confirmed cases of MERSCoV with 806 associated deaths (case fatality rate: 35.4%) were reported in 27 countries [Harcourt et al, 2018; World Health Organization (WHO), 2018a]. 1901 confirmed cases with 732 related deaths (fatality rate 38.5%) were reported from Saudi Arabia [Harcourt et al, 2018; World Health Organization (WHO), 2018a]. This strain showed the genome structural ornaisation of typical betacoronavirus such as a 5 -untranslated

Year Region
Viral Entry
Transmission and Clinical Presentation
Molecular Mechanism of the Pathogenesis
PAPAIN LIKE PROTEASE PLpro MEDIATED MECHANISM
ACCESSORY PROTEINS MEDIATED MECHANISM
HOST IMMUNE RESPONSE
ANIMAL MODELS
Readily available and easy to handle
Rhesus Macaques and Marmosets
DIAGNOSTIC APPROACHES
Rhinitis with necrosis Interstitial pneumonia
Type I and type II pneumocytes
VACCINES AND THERAPEUTICS
Current Vaccine and Antiviral Candidates
NOVEL THERAPEUTIC APPROACHES
Therapeutic Screening by Computational Biology
Findings
Protein based Recombinant viral vectors DNA vaccine
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