VP2 Gene-Based Molecular Evolutionary Patterns of Major Circulating Bluetongue Virus Serotypes Isolated during 2014-2018 from Telangana and Andhra Pradesh States of India

Ravali Thota; Vishweshwar Kumar Ganji; Sharanya Machanagari; Narasimha Reddy Yella; Bhagyalakshmi Buddala; Krishnajyothi Yadlapati; P P Rao; Sushila Maan; Narender S Maan; Divakar Hemadri; Karam Pal Singh; Kalyani Putty

doi:10.1159/000512131

VP2 Gene-Based Molecular Evolutionary Patterns of Major Circulating Bluetongue Virus Serotypes Isolated during 2014-2018 from Telangana and Andhra Pradesh States of India

Intervirology. 2020 Dec 30:1-8. doi: 10.1159/000512131. Online ahead of print.

Affiliations

¹ Departments of Veterinary Microbiology and Veterinary Biotechnology, College of Veterinary Science, PVNRTVU, Rajendranagar, Hyderabad, India.
² AP-VBRI, Vijayawada, India.
³ Biovet, Malur, India.
⁴ College of Veterinary Sciences, LLR University of Veterinary and Animal Sciences, Hisar, Haryana, India.
⁵ ICAR-NIVEDI, Yelahanka, Bengaluru, India.
⁶ Pathology Laboratory, CADRAD, ICAR-IVRI, Izatnagar, Bareilly, India.
⁷ Departments of Veterinary Microbiology and Veterinary Biotechnology, College of Veterinary Science, PVNRTVU, Rajendranagar, Hyderabad, India, kalyaniputty@gmail.com.

PMID: 33378762
DOI: 10.1159/000512131

Abstract

Introduction: Bluetongue disease is an economically important viral disease of livestock caused by bluetongue virus (BTV) having multiple serotypes. It belongs to the genus Orbivirus of family Reoviridae and subfamily Sedoreovirinae. The genome of BTV is 10 segmented dsRNA that codes for 7 structural and 4 nonstructural proteins, of which VP2 was reported to be serotype-specific and a major antigenic determinant.

Objective: It is important to know the circulating serotypes in a particular geographical location for effective control of the disease. The present study unravels the molecular evolution of the circulating BTV serotypes during 2014-2018 in Telangana and Andhra Pradesh states of India.

Methods: Multiple sequence alignment with available BTV serotypes in GenBank and phylogenetic analysis were performed for the partial VP2 sequences of major circulating BTV serotypes during the study period.

Results: The multiple sequence alignment of circulating serotypes with respective reference isolates revealed variations in antigenic VP2. The phylogenetic analysis revealed that the major circulating serotypes were grouped into eastern topotypes (BTV-1, BTV-2, BTV-4, and BTV-16) and Western topotypes (BTV-5, BTV-12, and BTV-24).

Conclusion: Our study strengthens the need for development of an effective vaccine, which can induce the immune response for a range of serotypes within and in between topotypes.

Keywords: Bluetongue; Indian BTV isolates; Phylogenetic analysis; Topotypes.