Antigenic Site Variation in the Hemagglutinin of Pandemic Influenza A(H1N1)pdm09 Viruses between 2009-2017 in Ukraine

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Pathogens. 2019 Oct 18;8(4). pii: E194. doi: 10.3390/pathogens8040194. Antigenic Site Variation in the Hemagglutinin of Pandemic Influenza A(H1N1)pdm09 Viruses between 2009-2017 in Ukraine.

Zolotarova O^1,2, Budzanivska I³, Leibenko L⁴, Radchenko L⁵, Mironenko A⁶.
Author information

1 Educational Scientific Centre "Institute of Biology and Medicine", Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine. oksanasmutko@gmail.com. 2 "Gromashevsky L.V. Institute of epidemiology and infectious diseases, National Academy of Medical Sciences of Ukraine" 03680 Kyiv, Ukraine. oksanasmutko@gmail.com. 3 Educational Scientific Centre "Institute of Biology and Medicine", Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine. birishechka68@gmail.com. 4 "Gromashevsky L.V. Institute of epidemiology and infectious diseases, National Academy of Medical Sciences of Ukraine" 03680 Kyiv, Ukraine. liudmyla.leib@gmail.com. 5 "Gromashevsky L.V. Institute of epidemiology and infectious diseases, National Academy of Medical Sciences of Ukraine" 03680 Kyiv, Ukraine. larysa_rad@ukr.net. 6 "Gromashevsky L.V. Institute of epidemiology and infectious diseases, National Academy of Medical Sciences of Ukraine" 03680 Kyiv, Ukraine. miralla@ukr.net.

Abstract

The hemagglutinin (HA) is a major influenza virus antigen, which, once recognized by antibodies and substitutions in HA genes, helps virus in escaping the human immune response. It is therefore critical to perform genetic and phylogenetic analysis of HA in circulating influenza viruses. We performed phylogenetic and genetic analysis of isolates from Ukraine, the vaccine strain and reference strains were used to phylogenetically identify trends in mutation locations and substitutions. Ukrainian isolates were collected between 2009-2017 and clustered in the influenza genetic groups 2, 6, 7, and 8. Genetic changes were observed in each of the antigenic sites: Sa - S162T, K163Q, K163I; Sb - S185T, A186T, S190G, S190R; Ca1 - S203T, R205K, E235V, E235D, S236P; Ca2 - P137H, H138R, A141T, D222G, D222N; Cb - A73S, S74R, S74N. In spite of detected mutations in antigenic sites, Ukrainian isolates retained similarity to the vaccine strain A/California/07/09 circulated during 2009-2017. However, WHO recommended a new vaccine strain A/Michigan/45/2015 for the Southern Hemisphere after the emergence of the new genetic groups 6B.1 and 6B.2. Our study demonstrated genetic variability of HA protein of A(H1N1)pdm09 viruses isolated in 2009-2017 in Ukraine. Influenza surveillance is very important for understanding epidemiological situations.


KEYWORDS:

antigenic site; genetic analysis; influenza A(H1N1)pdm09 virus; mutation

PMID: 31635227 DOI: 10.3390/pathogens8040194
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