Home HOME Acta Virologica 2023 Acta Virologica Vol.67, No.1, p. 79 – 90, 2023

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Founded: 1957
ISSN 0001-723X
E-ISSN 1336-2305

Published in English

Impact Factor = 1.82

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Acta Virologica Vol.67, No.1, p. 79 – 90, 2023

Title: Attenuation of equine herpesvirus 1 through deletion of gE gene and its pathological evaluation in murine model
Author: Bidhan Chandra Bera, Taruna Anand, Selvaraj Pavulraj, Venkataramireddy Balena, Stephanie Pradhan, Raj Kumar Singh, Bhupendra Nath Tripathi, Nitin Virmani

Abstract: Equine herpesvirus 1 (EHV1) infection is a global health problem in equines and the virus is responsible for abortions, respiratory disease and myeloencephalitis in horses. Disease management requires proper biosecurity and immunoprophylactic measures. Vaccines strengthening both arms of immunity are essential for proper control and there has been a continuous focus in this area for generation of better vaccines. Here we report construction of bacterial artificial chromosome (BAC) clone of EHV-1 strain Tohana for mutagenesis of the virus and generation of gE gene deletion mutant EHV1. The BAC clone was generated by inserting the mini-F plasmid replacing ORF71 of EHV1 and transforming into E. coli for generation of EHV1-BAC. The infectious virus was regenerated from EHV-1 BAC DNA in RK13 cells. To check utility of EHV1-BAC, we have generated mutant EHV1 by deleting the virulence-associated gE gene. The mutant virus (vToHΔgE) showed significantly reduced plaque size without affecting replication efficiency. Pathological evaluation of lesions in BALB/c mice infected with vToHΔgE revealed reduction in clinical signs and pathology in comparison to the wild-type virus. Generation of infectious BAC of EHV1 and its usage in construction of attenuated viruses shows potential of the technology for development of indigenous modified live vaccine for EHV1.

Keywords: quine herpesvirus 1; bacterial artificial chromosome (BAC); mutation; glycoprotein E; vaccine
Published online: 22-Mar-2023
Year: 2023, Volume: 67, Issue: 1 Page From: 79, Page To: 90

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