Comparison of amino acid sequences deduced from a cDNA fragment obtained from infectious pancreatic necrosis virus (IPNV) strains of different serotypes.

Abstract:

:Infectious pancreatic necrosis is an important viral disease of salmonid fish reared in hatchery. Its etiological agent, IPNV, showed a high degree of antigenic heterogeneity. Up to 10 serotypes and 2 serogroups were proposed. Yet, very little is known about genomic variations among viruses of different origin. In order to investigate these variations, a 310-bp cDNA fragment was prepared from 17 IPNV strains by reverse transcription of the viral genome and amplification by the polymerase chain reaction. These fragments were then cloned and sequenced. Comparison of the 17 sequences obtained with 3 previously published ones, at the amino acid level, showed that serologically related viruses are highly homologous (over 96% homology) but some strains which were reported to belong to different serotypes also appeared closely related. Thus, only three major groups, clearly distinct from each other, could be formed. Apart from this, a search for the exact cleavage site of the unprocessed polyprotein of IPNV was done since the amplified fragment used for sequencing was localized at the junction between two polypeptides of the virus, pVP2 and NS. No obvious sequence or dipeptide appeared conserved in all birnaviruses.

journal_name

Virology

journal_title

Virology

authors

Heppell J,Berthiaume L,Corbin F,Tarrab E,Lecomte J,Arella M

doi

10.1006/viro.1993.1441

subject

Has Abstract

pub_date

1993-08-01 00:00:00

pages

840-4

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(83)71441-8

journal_volume

195

pub_type

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