The identification of a novel reassortant H3N2 avian influenza virus based on nanopore sequencing technology and genetic characterization
10.3760/cma.j.cn112338-20230828-00105
- VernacularTitle:基于纳米孔测序技术对新型重组H3N2禽流感病毒的测序鉴定及其基因特征分析
- Author:
Lan CAO
1
;
Dan XIA
;
Yiyun CHEN
;
Tengfei ZHOU
;
Shanghui YIN
;
Yanhui LIU
;
Kuibiao LI
;
Biao DI
;
Zhoubin ZHANG
;
Pengzhe QIN
Author Information
1. 广州市疾病预防控制中心，广州 510440
- Keywords:
Avian influenza virus;
Gene reassortment;
Nanopore sequencing
- From:
Chinese Journal of Epidemiology
2024;45(4):574-578
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To identify a novel reassortant H3N2 avian influenza virus using nanopore sequencing technology and analyze its genetic characteristics.Methods:The positive samples of the H3N2 avian influenza virus, collected from the external environment in the farmers' market of Guangzhou, were cultured in chicken embryos. The whole genome was sequenced by targeted amplification and nanopore sequencing technology. The genetic characteristics were analyzed using bioinformatics software.Results:The phylogenetic trees showed that each gene fragment of the strain belonged to the Eurasian evolutionary branch, and the host source was of avian origin. The HA gene was closely related to the origin of the H3N6 virus. The NA gene was closely related to the H3N2 avian influenza virus from 2017 to 2020. The PB1 gene was closely related to the H5N6 avian influenza virus in Guangxi Zhuang Autonomous Region and Fujian Province from 2016 to 2022 and was not related to the PB1 gene of the H5N6 avian influenza epidemic strain in Guangzhou. The other internal gene fragments had complex sources with significant genetic diversity. Molecular characteristics indicated that the strain exhibited the molecular characteristics of a typical low pathogenic avian influenza virus and tended to bind to the receptors of avian origin. On important protein sites related to biological characteristics, this strain had mutations of PB2-L89V, PB1-L473V, NP-A184K, M1-N30D/T215A, and NS1-P42S/N205S.Conclusions:This study identified a novel reassortant H3N2 avian influenza virus by nanopore sequencing, with the PB1 gene derived from the H5N6 avian influenza virus. The virus had a low ability to spread across species, but further exploration was needed to determine whether its pathogenicity to the host was affected.
