Complete Sequence of Proviral DNA of Equine Infectious Anemia Virus Strain L

作     者：LIU Hong-quan, WANG Liu, YANG Zhi-biao, KONG Xian-gang and TONG Guang-Zhi(National Key Labortory of Veterinary Biotechnology, Harbin Veterinary Research Institute , CAAS , Harbin 150001) 

作者机构：National Key Labortory of Veterinary Biotechnology Harbin Veterinary Research Institute CAAS Harbin 150001 

出 版 物：《Agricultural Sciences in China》 (中国农业科学（英文版）)

年 卷 期：2002年第1卷第2期

页      面：232-237页

学科分类：090603[农学-临床兽医学] 09[农学] 0906[农学-兽医学] 

基　　金：by National Science Foundation of China(No.39470535) 

主　　题：Equine infectious anemia virus Strain L Proviral DNA Sequence analysis 

摘      要：Equine infectious anemia virus strain L (EIAV-L) is the parental virulent virus of equine infectious anemia donkey leukocyte attenuated vaccine (DLA EIAV). In this study, peripheral blood leukocytes(PBL) were collected from a horse infected with *** PBL DNAs were *** EIAV-L proviral DNA was amplified in four parts covering the entire proviral genomic sequence by polymerase chain reaction (PCR). Each of the four parts was cloned into the plasmid pBluescript SK, and the recombinant plasmids were designated as p2.8, p2.4. p3.1, and p1.2 respectively. After identification with restriction digestion, the inserts within the four plasmids were sequenced. The complete nucleotide sequence of EIAV-L provirus was determined by analyzing each of the four parts and connecting them as a whole. The genome of EIAV-L is 8235 bp in length, and G + C content is 38%. The comparison analysis by the computer software DNASIS showed that the sequence of EIAV-L shares 98.4% and 96.9% identities with that of D-A EIAV and DLA EIAV respectively. The high homology between these strains showed that they were genetically related. The homology between EIAV-L and D-A EIAV is higher than that between EIAV-L and DLA EIAV, and this is consistent with the derivation progress of DLA EIAV. At both ends of EIAV-L provirus, there is an identical long terminal repeat (LTR) sequence of 316bp in length. The LTR consists of U3, R, and U5 regions. The genome of EIAV-L provirus has three long open reading frames(ORF) corresponding to gag, pol and env genes respectively. The gag gene is 1200bp and located at position 613-1912nt. The pol gene is 3402bp and located at position 1708-5109nt. There is a termination codon within the env dividing it into two parts, envl of 699bp (position 5305-6003nt)and env2 of 1827bp (position 6073-7899nt). The provirus has three additional small ORFs: S1, S2 and S3 with sizes of 153bp(position 5113-5265nt), 204bp(position 5279-5482nt)and 402bp(position 7245-7646nt) r