Turkey Adenovirus 3: ORF1 Gene Sequence Comparison Between Vaccine-Like and Field Strains

Author:

Quaglia Giulia1,Francesco Antonietta Di1,Catelli Elena1,Mescolini Giulia1,Lupini Caterina1

Affiliation:

1. University of Bologna

Abstract

Abstract Haemorrhagic enteritis is an economically significant disease reported in the majority of the countries where turkeys are raised intensively; it is caused by turkey adenovirus 3 (TAdV-3). The aim of this study was to analyse and compare the ORF1 gene 3′ region from turkey haemorrhagic enteritis virus (THEV) vaccine-like and field strains in order to develop a molecular diagnostic method to differentiate the strains from each other. Eighty samples were analysed by sequencing and phylogenetic analyses using a new set of polymerase chain reaction (PCR) primers targeting a genomic region spanning the partial ORF1, hyd and partial IVa2 gene sequences. A commercial live vaccine was also included in the analysis. The results showed that 56 of the 80 sequences obtained in this study showed ³99.8% nucleotide identity with the homologous vaccine strain sequence. Three non-synonymous mutations – ntA1274G (aaI425V), ntA1420C (aaQ473H) and ntG1485A (aaR495Q) – were detected in the THEV field strains but not in the vaccine strain. Phylogenetic analysis confirmed the clustering of the field and vaccine-like strains in different phylogenetic branches. In conclusion, the method employed in this study could be a useful tool towards making a correct diagnosis. The data could contribute to the knowledge of field distribution of THEV strains and increase the limited existing information available on native isolates around the world.

Publisher

Research Square Platform LLC

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