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J. Microbiol. Biotechnol. 2010; 20(11): 1500-1505

Published online November 28, 2010 https://doi.org/10.4014/jmb.1006.06031

Copyright © The Korean Society for Microbiology and Biotechnology.

Envelope Proteins Pertain with Evolution and Adaptive Mechanism of the Novel Influenza A/H1N1 in Humans

Shakhinur Islam Mondal 1, Abdullah Zubaer 1, Simrika Thapa 1, Chinmoy Saha 1, Md. Asraful Alum 1, Md. Salman Reza 1, Arzuba Akter 2 and Abul Kalam Azad 1, 3*

1Department of Genetic Engineering and Biotechnology, Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh, 2Department of Biochemistry and Molecular Biology, Dhaka University, Dhaka -1000, Bangladesh, 3Department of Life Science and Biotechnology, Shimane University, Shimane 690-8504, Japan

Received: June 25, 2010; Accepted: August 4, 2010

Abstract

The novel swine-origin influenza A/H1N1 virus (S-OIV) first detected in April 2009 has been identified to transmit from human to human directly and is the cause of currently emerged pandemic. In this study, nucleotide and deduced amino acid sequences of hemagglutinin (HA) and neuraminidase (NA) of the S-OIV and other influenza A viruses were analyzed through bioinformatic tools for phylogenetic analysis, genetic recombination and point mutation to investigate the emergence and adaptation of the S-OIV in human. The phylogenetic analysis showed that the HA comes from triple reassortant influenza A/H1N2 and the NA from Eurasian swine influenza A/H1N1 indicating HA and NA to descend from different lineages during the genesis of the S-OIV. Recombination analysis nullified the possibility of occurrence of recombination in HA and NA denoting the role of reassortment in the outbreak. Several conservative mutations are observed in the amino acid sequences of the HA and NA and this mutated residues are identical in the S-OIV. The results reported herein suggested the notion that the recent pandemic is the result of reassortment of different genes from different lineages of two envelope proteins, HA and NA which are responsible for antigenic activity of virus. This study further suggests that the adaptive capability of the S-OIV in human is acquired by the unique mutations generated during emergence.

Keywords: Hemagglutinin, influenza A/H1N1, mutation, neuraminidase, reassortment, S-OIV