Genetic lineage and reassortment of influenza C viruses circulating between 1947 and 2014

Yoko Matsuzaki, Kanetsu Sugawara, Yuki Furuse, Yoshitaka Shimotai, Seiji Hongo, Hitoshi Oshitani, Katsumi Mizuta, Hidekazu Nishimura

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


Since influenza C virus was first isolated in 1947, the virus has been only occasionally isolated by cell culture; there are only four strains for which complete genome sequences are registered. Here, we analyzed a total of 106 complete genomes, ranging from the first isolate from 1947 to recent isolates from 2014, to determine the genetic lineages of influenza C virus, the reassortment events, and the rates of nucleotide substitution. The results showed that there are six lineages, named C/Taylor, C/Mississippi, C/Aichi, C/Yamagata, C/Kanagawa, and C/Sao Paulo. They contain both antigenic and genetic lineages of the hemagglutininesterase (HE) gene, and the internal genes PB2, PB1, P3, NP, M, and NS are divided into two major lineages, a C/Mississippi/80- related lineage and a C/Yamagata/81-related lineage. Reassortment events were found over the entire period of 68 years. Several outbreaks of influenza C virus between 1990 and 2014 in Japan consisted of reassortant viruses, suggesting that the genomic constellation is related to influenza C virus epidemics. The nucleotide sequences were highly homologous to each other. The minimum percent identity between viruses ranged from 91.1% for the HE gene to 96.1% for theMgene, and the rate of nucleotide substitution for the HE gene was the highest, at 5.20 × 10-4 substitutions/site/year. These results indicate that reassortment is an important factor that increases the genetic diversity of influenza C virus, resulting in its ability to prevail in humans.

Original languageEnglish
Pages (from-to)8251-8265
Number of pages15
JournalJournal of Virology
Issue number18
Publication statusPublished - 2016


Dive into the research topics of 'Genetic lineage and reassortment of influenza C viruses circulating between 1947 and 2014'. Together they form a unique fingerprint.

Cite this