Multiple alignment comparison of the non-structural genes of three strains of equine influenza viruses (H3N8) isolated in Morocco

BMC Research Notes

My Mustapha Ennaji³  Mehdi Elharrak²  Souad Azlmat¹  Mohamed Boukharta³ 

[1] Department of Biology, Instruction Military Hospital Med V Rabat, University Mohammed V Souissi, Rabat, Morocco;Society of Pharmaceutical and Veterinary Products, Virology Laboratory, Av Hassan II, Rabat, BP 4569, Morocco;Laboratory of Virology, Microbiology and Quality/ETB, Faculty of Sciences and Techniques, Mohammedia, University Hassan II Mohammedia-Casablanca, Quartier Yasmina, Mohammedia 20650, Morocco

关键词: Effector domain;    RNA-binding domain;    Non-structural protein (NS);    Equine influenza virus;   

Others  :  1230040
DOI  :  10.1186/s13104-015-1441-0

 received in 2015-02-24, accepted in 2015-09-11,  发布年份 2015

【 摘 要 】

Background

Three equine influenza viruses, A/equine/Nador/1/1997(H3N8), A/equine/Essaouira/2/2004(H3N8), and A/equine/Essaouira/3/2004(H3N8), were isolated from different Equidae during local respiratory disease outbreaks in Morocco in 1997 and 2004. Their non-structural (NS) genes were amplified and sequenced.

Results

The results show high homology of NS nucleotide sequences of A/equine/Nador/1/1997 with European strains (i.e., A/equine/newmarket/2/93 and A/equine/Grobois/1/1998) and clustered into the European lineage. However, NS gene of A/equine/Essaouira/2/2004(H3N8) and A/equine/Essaouira/3/2004(H3N8) strains indicated high homology with equine influenza strains that had circulated before 1990 (A/equine/Fontainbleu/1/1979(H3N8), which belonged to a pre-divergent phase Amino acid sequence comparison of the NS1 protein with reference strain A/equine/Miami/1963(H3N8) shows that the A/equine/Nador/1/1997(H3N8) strain has 12 substitutions at the residues D/24/N, R/44/K, S/48/I, R/67/Q, A/86/V, E/139/K, A/112/T, E/186/K, L/185/F, A/223/E, S/213/T and S/228/P. In both A/equine/Essaouira/2/2004(H3N8) and A/equine/Essaouira/3/2004(H3N8) strains, the NS1 sequences present one common mutation at the residue: S/228/P.

Conclusion

It seems that all of these substitutions are not produced at the key residues of the RNA-binding domain (RBD) and the effector domain (ED). Consequently, we can suppose that they will not affect the potency of inhibition of cellular defences, and the virulence of the Moroccan equine strains will be maintained.

【 授权许可】

   
2015 Boukharta et al.

【 图 表 】

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