Antigenic variability among two subtypes of human adenovirus serotype 7.
Human adenovirus type 7 (HAdV-7) is one of the major serotypes responsible for acute respiratory infection. It is important to investigate the antigenic variabilities of different HAdV-7 genomic subtypes for vaccine development. Phylogenetic analysis of global HAdV-7 strains and major antigen proteins showed that HAdV-7 could be classified into two subtypes. There were three highly variable regions (HVR1, HVR4, and HVR7) in the hexon protein that varied between subtypes. Within each of the subtypes, these regions were conserved. Two subtype HAdV-7 strains isolated in China were used to immunize mice for antigenic characterization. Mice immunized with one subtype strain showed 4-8-fold lower neutralizing antibody titers against another subtype strain. ELISA results showed that the variation in HVR1, 4, and 7 regions contributed to antigenic change, and it may be concluded that the three regions contain subtype-specific epitopes. In summary, strains of HAdV-7 could be divided into two subtypes using genome sequence and antigenic analysis; our results could be important for HAdV-7 vaccine development.
State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, 151 Yan Jiang Road, Guangzhou, 510120, China, tianxingui7902@aliyun.com.
Xingui
X
Tian
Xiaobo
X
Su
Chunyan
C
Xue
Xiao
X
Li
Zhichao
Z
Zhou
Rong
R
Zhou
D000257:Adenoviridae Infections / Q000821:virology; D000260:Adenoviruses, Human / Q000145:classification* / Q000276:immunology* / Q000302:isolation & purification; D000818:Animals; D057134:Antibodies, Neutralizing / Q000097:blood; D000914:Antibodies, Viral / Q000097:blood; D000940:Antigenic Variation; D036022:Capsid Proteins / Q000276:immunology*; D002681:China; D004797:Enzyme-Linked Immunosorbent Assay; D005838:Genotype; D006801:Humans; D051379:Mice; D009500:Neutralization Tests; D012141:Respiratory Tract Infections / Q000821:virology; D065288:Serogroup
D057134:Antibodies, Neutralizing; D000914:Antibodies, Viral; D036022:Capsid Proteins; C018315:hexon capsid protein, Adenovirus