Related Experiment Videos
Bovine leukemia virus gene expression in vivo
1Department of Microbiology, Parasitology, and Immunology, New York State College of Veterinary Medicine, Cornell University, Ithaca 14853.
Journal of Virology
|October 1, 1992
Summary
Bovine leukemia virus (BLV) transcripts are detectable in most infected cattle. As disease progresses to leukemia, BLV shifts to expressing only essential tax/rex transcripts.
Area of Science:
- Veterinary Virology
- Molecular Biology
- Oncology
Background:
- Bovine leukemia virus (BLV) causes significant economic losses in the cattle industry.
- Understanding the in vivo transcriptional activity of BLV is crucial for diagnosing and managing the disease.
Purpose of the Study:
- To investigate the transcriptional status of BLV at different stages of infection and disease progression.
- To identify changes in BLV RNA expression patterns associated with the development of leukemia/lymphosarcoma.
Main Methods:
- Reverse transcription polymerase chain reaction (RT-PCR) was used to detect BLV transcripts in lymphocytes.
- Primer pairs specific for differentially spliced BLV transcripts (full-length genomic, envelope, tax/rex) were employed.
Main Results:
- BLV transcripts were detected in lymphocytes from most infected animals across all stages, including persistent lymphocytosis and leukemia.
- A notable trend was observed where full-length and envelope BLV RNAs were increasingly excluded, while tax/rex transcripts were retained as the disease progressed to leukemia/lymphosarcoma.
Conclusions:
- The transcriptional activity of BLV can be detected in vivo throughout the course of infection.
- The selective retention of tax/rex transcripts during leukemia development suggests a role for these specific viral RNAs in disease pathogenesis.