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Variation analysis of the VP1 and 3ABC genes from yellow cattle isolates persistently infected by Foot-and-mouth disease virus

Published online by Cambridge University Press:  29 January 2010

Shen Xiao-yan ,
Cong Guo-zheng ,
Chang Hui-yun ,
Liu Xiang-tao  and
Xie Qing-ge
Shen Xiao-yan
Affiliation:
State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, National FMD Reference Laboratory, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
Cong Guo-zheng
Affiliation:
State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, National FMD Reference Laboratory, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
Chang Hui-yun*
Affiliation:
State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, National FMD Reference Laboratory, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
Liu Xiang-tao
Affiliation:
State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, National FMD Reference Laboratory, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
Xie Qing-ge
Affiliation:
State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Animal Virology of Ministry of Agriculture, National FMD Reference Laboratory, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
*
*Corresponding author. E-mail: [email protected]
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Abstract

The potential relationship between the establishment of Foot-and-mouth disease virus (FMDV) persistent infection and gene variation was identified by investigating the variation of VP1 and 3ABC genes from yellow cattle persistent infection isolates. Five yellow cattle were inoculated on their tongue with 1.0×104 ID50/ml of FMDV O/Akesu/58 strain. After displaying clinical or subclinical signs, they probably became asymptomatic carriers. Oesophageal–pharyngeal fluids were collected monthly from the carriers with a probang and inoculated into a baby hamster kidney cell line (BHK-21); 12 FMDV isolates were obtained. The VP1 and 3ABC genes of the 12 isolates were then amplified by reverse-transcriptase polymerase chain reaction (RT-PCR). Cloning and sequencing revealed that the homology of the VP1 nucleotide and amino-acid sequence of all the isolates was above 98%, with no base deletion or insertion. When compared with the O/Akesu/58 FMDV strain, the homology of the VP1 nucleotide sequence of the isolates was only 85%, and that of the deduced amino-acid sequence only 90%.There were several nucleotide mutations in the VP1 gene of the isolates, including 16 consistent nucleotide mutations, with only two of them leading to a change in amino acid (I56→T, A210→E). Moreover, it was found that four nucleotide points and three amino-acid points had transversions among all isolates. The 3ABC gene had only 13 nucleotide transversions and five amino-acid mutations. It was presumed that persistent FMDV infection might have little connection with variation in the VP1 and 3ABC genes, and was probably related to other structural protein gene and key factors.

Keywords

Foot-and-mouth disease virusyellow cattlepersistent infectiongene variation
Type
Research Papers
Information
Chinese Journal of Agricultural Biotechnology , Volume 6 , Issue 3 , December 2009 , pp. 191 - 197
Copyright
Copyright © China Agricultural University 2009

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