›› 2019, Vol. 46 ›› Issue (7): 2059-2068.doi: 10.16431/j.cnki.1671-7236.2019.07.022

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Isolation, Identification and Complete Genome Sequence Analysis of Fowl Adenovirus Genotype 4 W Strain

ZHAO Yujie, LIU Jianxun, CHEN Tiantian, WANG Sainan, HE Chunhui, CHEN Panpan, LIU Lin, LI Xinsheng   

  1. College of Animal Husbandry and Medical Engineering, Henan Agricultural University, Zhengzhou 450002, China
  • Received:2018-11-23 Online:2019-07-20 Published:2019-07-22

Abstract:

In order to understand the complete gene sequence,structural characteristics and genetic variation of fowl adenovirus genotype 4 (FAdV-4) W strain,the liver and kidney of infected chicken were identified by PCR.The isolation of SPF chicken embryo and electron microscope observation showed that the virus was FAdV-4 and TCID50 was 10-7.2/0.1 mL.The virus was about 70 nm in diameter and without envelope under electron microscope.Chorioallantoic membrane inoculation of 10-day-old SPF chicken embryos could significantly inhibit the development of chicken embryos and produce dwarf embryos,and the death rate was 100% within 10 days after inoculation with chorioallantoic membrane.The complete genome of W strain was amplified and sequenced.The virus was 43 591 bp,which had 60 open reading frames.The nucleotide sequence homology was 98.4% to 100% between W strain and referenced FAdV-4 strains published in GenBank.The homology was 98.4% with standard non-pathogenic virus strain ON1 (accession No.:GU188428.1).The ORF19 (lipase gene) and ORF27 were not found.It was found that W strain was closely related to the domestic isolates by analyzing the Hexon,Fiber-1 and Fiber-2 genes of the main structural proteins in recent years.It had a great difference with the ON1 strain and other foreign strains.The results showed that the strain had high pathogenicity and was different from foreign isolates,which provided the basis data for further analysis of the virulence enhancement mechanism of FAdV-4.

Key words: fowl adenovirus; isolation; identification; Fiber gene

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