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. 1991 Mar;65(3):1605–1610. doi: 10.1128/jvi.65.3.1605-1610.1991

Identification of a hypervariable region in the long terminal repeat of equine infectious anemia virus.

S Carpenter 1, S Alexandersen 1, M J Long 1, S Perryman 1, B Chesebro 1
PMCID: PMC239946  PMID: 1847479

Abstract

An avirulent, field-derived isolate of equine infectious anemia virus (EIAV), designated MA-1, was molecularly cloned, and the complete nucleotide sequence was determined for the 3' half of the viral genome. Comparisons between MA-1 and the prototype Wyoming strain of EIAV identified a 66-nucleotide stretch between CAAT (-91) and TATAA (-25) in the U3 region of the long terminal repeat, where sequence divergence was as high as 39.3%. The polymerase chain reaction was used to amplify and clone long terminal repeat sequences from Th-1, the in vivo parental stock of MA-1. Results indicated that the nucleotide sequences of MA-1 and Th-1 clones were less variable than was observed between MA-1 and Wyoming. However, MA-1 and Th-1 markedly differed in the types of enhancer sequences located in the hypervariable region. These results suggest that variation in lentivirus regulatory sequences may be important in EIAV host cell tropism and pathogenesis.

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Selected References

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