Molecular analysis of bovine leukemia virus in early epidemic phase in Japan using archived formalin fixed paraffin embedded histopathological specimens

Abstract

Bovine leukemia virus (BLV) is an important pathogen associated with enzootic bovine leukosis. In this study, we performed PCR and sequencing analysis to characterize BLVgp51 sequences from FFPE specimens made from 1974 to 2000 and successfully obtained BLV proviral genome sequences from 94% of the analyzed samples. Furthermore, from these samples, we reconstructed eight full-length and nearly full-length BLVgp51 sequences. These sequences were classified as BLV genotype 1, implying that genotype1 has already been circulating in Japan since the 1970s. In our results, the proviral DNA was detected in the 1970s, 1980s, and 1990s in the same manner, indicating that the detection of BLV proviral genome depends on storage conditions rather than storage period. The sequences obtained in this study provide direct insights into BLV sequences before 2000, which serves as a good calibrator for inferring ancient BLV diversity.

Application of Flow Cytometry in the Diagnosis of Bovine Epidemic Disease

“…The virus infects lymphocytes and integrates DNA intermediates into the cellular genome as a provirus. The disease is a chronic neoplastic disease of cattle, and most infected cattle are asymptomatic, which makes the virus have a high shedding rate in many cattle herds, posing a serious threat to the development of cattle farming [ 34 , 35 , 36 ]. The common detection methods for BLV include qPCR, ELISA, and lymphocyte count.…”