Key result
Whole genomic analysis revealed that the BJ04 and BJ09 HAdV-C strains isolated in Beijing are complex homologous recombinants of multiple parental strains, highlighting frequent recombination as a driver of viral evolution.
Frequent recombination is an important driving force for the complexity of the HAdV-C epidemic in Beijing, highlighting the need for ongoing epidemiological and virological surveillance.
Supports ongoing HAdV-C surveillance; leaves open whether recombination alters human disease or vaccine efficacy.
Human mastadenovirus species C (HAdV-C) are the most common etiologic agents of respiratory disease in young children and are frequently detected worldwide including China. Two recombinant HAdV-C strains (BJ04 and BJ09) were isolated from infants with acute respiratory infection (ARI) in Beijing in 2012-2013. The whole genome sequences (WGS) of BJ04 and BJ09 were generated and compared to other 35 HAdV-C WGSs publicly available. Phylogenetic analyses showed that the BJ04 strain might be the result of three homologous recombination events involving the parental strains JX173086 (HAdV-1), NC_001405 (HAdV-2) and LC068718 (HAdV-6), whereas BJ09 viral genome might be made of genetic elements from JX173083 (HAdV-1), KF268199 (HAdV-5), and KR699642 (strain CBJ113). Despite intratypic recombination, amino acid analysis showed that the gene repertoire of BJ04 and BJ09 were similar to type 2 viruses. Finally, this analysis revealed that at least three lineages of HAdV-C have been identified in China, represented by BJ04 related to NC_001405, BJ09 related to CBJ113, and KF951595 (strain DD28) related to virus isolated in Japan. This study showed that the frequent recombination played an important driving force for complexity of the HAdV-C epidemic in Beijing, thereby demonstrating the necessity for epidemiological and virological surveillance for HAdV-C in China.
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Mao et al. (2017) studied Acute respiratory infection (Human mastadenovirus species C) (n=37). Human mastadenovirus species C (HAdV-C) strains BJ04 and BJ09 vs. Other HAdV-C prototype sequences was evaluated on Phylogenetic and recombination analysis of whole genome sequences. Whole genomic analysis revealed that the BJ04 and BJ09 HAdV-C strains isolated in Beijing are complex homologous recombinants of multiple parental strains, highlighting frequent recombination as a driver of viral evolution.
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