Molecular mutation features of influenza B viruses in Guangdong, 2020-2021

Jing TAN; Lijun LIANG; Ping HUANG; Xiaoling HUANG; Baisheng LI; Hong CAO; Lirong ZOU

doi:10.16016/j.2097-0927.202203022

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Molecular mutation features of influenza B viruses in Guangdong, 2020-2021

Public Health and Preventive Medicine | 更新时间：2026-01-09

- Molecular mutation features of influenza B viruses in Guangdong, 2020-2021
- Journal of Army Medical University Vol. 44, Issue 17, Pages: 1791-封3(2022)
- 作者机构：
  
  1.510515 广州，南方医科大学公共卫生学院
  2.511430 广州，广东省疾病预防控制中心广东新发突发传染病防治工作站
- 作者简介：
- 基金信息：
  
  the Natural Science Foundation of Guangdong Province(2016A030313775);the Project of Science and Technology Plan of Guangzhou City(201904010286);the Scientific Research Project of Guangdong Provincial Bureau of Traditional Chinese Medicine(20202024)
- DOI：10.16016/j.2097-0927.202203022
  CLC： R195.4;R394.3;R511.7
- Received：03 March 2022，
  
  Revised：2022-04-27，
  
  Published：15 September 2022
- 稿件说明：
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Jing TAN, Lijun LIANG, Ping HUANG, et al. Molecular mutation features of influenza B viruses in Guangdong, 2020-2021[J]. Journal of Army Medical University, 2022, 44(17): 1791-封3.
DOI：

Jing TAN, Lijun LIANG, Ping HUANG, et al. Molecular mutation features of influenza B viruses in Guangdong, 2020-2021[J]. Journal of Army Medical University, 2022, 44(17): 1791-封3. DOI： 10.16016/j.2097-0927.202203022.

摘要

目的

了解乙型流感Victoria株系(influenza B victoria lineage

Bv)疫情的分子基础，分析该株系流感的流行趋势。

方法

基于广东流感监测网络(GDISN)采用时空分布方法筛选流感Bv毒株，检测HA/NA基因核苷酸序列；采用MEGA 7.026、Datamonkey 2.0、NetNGlyc 1.0 Server、SPSS 23.0软件等，分析其核苷酸/氨基酸序列的同源性、进化树、氨基酸与表位变异、糖基化位点和进化选择性等。

结果

广东2021年毒株较2020年毒株同源性呈现明显差异(

0.01)，2021年下半年毒株(17株)HA基因与疫苗株B/Austria/1359417/2021同源性高达(99.28±0.25)%。HA基因A表位(H

137

N/Q、A

142

T和R

148

G)、B表位(P

159

L和N

162

K) 和D表位(S

209

N/D和T

211

A)以及RBS位点(P

253

Q)发生变异；2020年毒株呈Bv.1a.3株系特征，2021年毒株主要呈Bv.1a.3a.2株系特征。HA与NA基因潜在糖基化位点均无有意义改变；NA基因没有出现药敏位点变异；HA和NA基因氨基酸负向选择位点分别是73、138、437和497位点和179、321和335位点。

结论

广东2021年毒株HA和NA基因较2020年毒株均发生较明显变异，尤以2021年下半年毒株的HA基因变异明显；Bv毒株HA基因表位出现新变异，提示引发下一流感季节广泛局部流行的预警。

Abstract

Objective

To learn the molecular characteristics of influenza B Victoria lineage (Bv) and evaluate the influenza B spread trend about the epidemic.

Methods

Based on the Guangdong Influenza Surveillance Networks (GDISN) to selected the Bv with space-time sampling

the nucleotide sequences of HA/NA genes were detected. The evolution and mutations of both genes were analyzed in homology with MEGA 7.026和SPSS 23.0

in evolutionary tree with neighbor-joining method

in selective evolution with Datamonkey 2.0.

Results

The nucleotide homologies of HA/NA genes in the 2021 strains were statistically different from these of the 2020's (P < 0.01)

in which the those of HA genes in 17 strains isolated in the second half of 2021 were up to (99.28±0.25)% compared with these in the vaccine strain B/Austria/1359417/2021. As to HA genes

the epitope A (H137N/Q

A142T and R148G)

B (P159L and N162K) and D (S209N/D and T211A) were mutated

therefore the 2020 and 2021 strains in Guangdong were respectively classified into Clade Bv.1a.3 and Bv.1a.3a.2. There were significantly no mutations in the potential glycosylation sites in HA/NA genes

as well in the NA known drug sensitive sites. Evolutionary selection conducted the negative selection sites in HA/NA genes

including amino acid sites 73

138

437 and 497 in HA and sites 179

321 and 335 in NA.

Conclusion

Influenza Bv strains including HA and NA genes in Guangdong 2021 strain are significantly different from these of the 2020 strains

especially on HA genes in the second half of 2021.

关键词

Keywords

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