Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (6): 2543-2554.doi: 10.11843/j.issn.0366-6964.2023.06.032

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Genetic Evolution and Spatio-temporal Transmission Analysis of the Chinese Infectious Bronchitis Virus

FAN Wensheng1, LIU Sijia1, QIU Shenben1, HUANG Aifang1, WANG Yan1, LIU Minfang1, MEI Minmin1, CHEN Xinliang1, WEI Ping2*, MO Meilan2*   

  1. 1. College of Animal Science and Technology, Guangdong Polytechnic of Science and Trade, Guangzhou 510430, China;
    2. College of Animal Science and Technology, Guangxi University, Nanning 530004, China
  • Received:2022-11-23 Online:2023-06-23 Published:2023-06-16

Abstract: The aim of this study was to explore the rules of the genetic variation and spatio-temporal transmission of the Chinese IBV isolates, all the sequences of N gene from GenBank database were downloaded. Bioinformatic software including MEGA 6.0, RDP 4.95, SimPlot 3.5.1, BEAST v1.10.4, jmodeltest 2.1.7, Tracer v1.7.1, TempEst v1.5.1, FigTree v1.4.3 and SpreaD3 v0.9.7 were respectively used to analyze the characteristics of phylogenetic tree, recombination events, origin,population dynamics and spatio-temporal transmission of the IBV isolates. The phylogenetic tree analysis showed that a total of six genotypes were identified, and the LX4-type was the predominant genotype. The recombination analysis showed that recombination event was found in N gene in one of isolate from Sichuan province. The maximum clade credibi-lity tree showed that the Chinese IBVs were most likely to be originated in Liaoning province in the early 1930s. Bayesian phylogeographic analyses indicated that multiple transmission routes and three epicenters in China were found, including the Northeastern Region (Heilongjiang, Liaoning, and Jilin), the Northern and Eastern Region (Hebei, Shandong and Jiangsu) and the Southern Region (Guangdong and Guangxi). Shandong has been the source of spreads in China. Our study revealed that the IBVs' origin, transmission routes and a recombination event occurred in N gene in China, suggesting that it is necessary to continue to carry out the molecular epidemiology study and strengthen the analysis of the N gene of IBV.

Key words: infectious bronchitis virus, genetic variation, recombination, origin, spatial transmission

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