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  • Title: Presence of a full-length highly polymorphic region (HPR) in the ISAV haemagglutinin-esterase does not affect the primary functions of receptor binding and esterase activity.
    Author: McBeath A, Fourrier M, Munro E, Falk K, Snow M.
    Journal: Arch Virol; 2011 Dec; 156(12):2285-9. PubMed ID: 21935625.
    Abstract:
    The putatively avirulent infectious salmon anaemia virus (ISAV) HPR0 variant has key phenotypic differences to isolates from disease outbreaks in Atlantic salmon farms. It appears to not cause disease, potentially displays a different tissue tropism and has yet to be isolated in conventional ISAV-permissive cell lines. This study focussed on identifying the biological basis for the observed differences by examining the properties of the haemagglutinin-esterase (HE) proteins derived from NWM10 (HPR0), Nevis 390/98 (HPR7 pathogenic strain) and mutant combinations of the two. Using a transfection-based system and haemadsorption analysis in salmon cell lines, this study demonstrated for the first time that an HPR0 HE was fully functional in terms of receptor-binding and -destroying activity and also suggested that the presence of a full-length HPR alone did not appear to affect these functions.
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