Home Acta Virologica 2018 Acta Virologica Vol.62, No.1, p.86-97, 2018

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ISSN 0001-723X
E-ISSN 1336-2305

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Acta Virologica Vol.62, No.1, p.86-97, 2018

Title: Sequence analysis of VP2 hypervariable region of the field isolates of infectious bursal disease viruses from southern region of India
Author: P. RAJA, T. M. A. SENTHILKUMAR, C. V. PRIYADARSHINI, M. PARTHIBAN, A. THANGAVELU, A. MANGALA GOWRI, A. PALANISAMMI, K. KUMANAN

Abstract: Infectious bursal disease virus isolates obtained from southern parts of India were subjected to comparative sequencing and phylogenetic analysis of 743bp hypervariable region of VP2. The sequence analysis showed that among eight isolates, only HY12 showed the characteristic conserved amino acid residues at 256I, 294I, and 299S of vvIBDV. Six isolates BGE14, PY12, NKL14, VCN14, RPM14 and EDE14 had conserved amino acid residues at 256I and 299S, whereas at residue 294, isoleucine was substituted by valine. The remaining isolate MB11 had leucine at residue 294 and asparagine at residue 299 similar to classical strain 52/70. The serine-rich heptapeptide sequence SWSASGS adjacent to the second hydrophilic region was conserved in all seven Indian IBDV isolates except isolate MB11. Conservation of this sequence was earlier reported to be an indication of a virus isolate being pathogenic in nature. The reported heptapeptide sequence of the classical strain is ‘SWSARGS’. In the present study, ‘SWSARGS’ heptapeptide sequence was observed in MB11 isolate. The pathogenicity trials conducted with these isolates further confirmed the genome analysis in classification. This study further reveals that the circulating IBDV strains in India could be diverse in nature.

Keywords: infectious bursal disease virus; Indian isolates; reverse-transcription polymerase chain reaction; VP2 gene; sequence analysis; amino acid substitutions
Published online: 09-Mar-2018
Year: 2018, Volume: 62, Issue: 1 Page From: 86, Page To: 97
doi:10.4149/av_2018_110


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