Bovine Leukemia Virus Infection Dynamics and Control

Bovine leukemia virus (BLV) is a deltaretrovirus that infects cattle worldwide, causing enzootic bovine leucosis, a persistent lymphoproliferative disease of B-lymphocytes. Infection typically begins with entry of cell-associated virus into susceptible lymphoid tissue, followed by integration of the provirus into host genomes. A long latent period often precedes persistent lymphocytosis and, in a subset of animals, malignant lymphoma. Transmission occurs principally via the transfer of infected lymphocytes in blood, milk or saliva, and management practices such as shared needles or rectal palpation can amplify herd-level spread. Diagnostics encompass serological assays for antibodies, PCR quantitation of proviral load and genotyping of envelope genes to trace viral lineages. Control strategies rely on herd screening with bulk-milk or serum ELISA, segregating or culling seropositive animals, stringent hygiene measures and selective breeding for resistant genotypes. Emerging approaches include immunoinformatics-driven vaccine design, competitive infection with attenuated strains and manipulation of viral antisense transcription to attenuate pathogenicity. Integrating molecular surveillance with biosecurity and novel immunotherapeutics offers a pathway towards reducing BLV prevalence, mitigating economic losses and limiting zoonotic concerns associated with prolonged animal–human contact.

Research from Nature Portfolio

Recent studies have employed immunoinformatic analyses to map CD4+ T-cell epitopes within the Gag protein of BLV across global isolates. By predicting BoLA-DRB3-restricted peptide–MHC interactions, researchers identified a panel of conserved epitopes that correlate with proviral load in peripheral blood mononuclear cells. These findings illuminate how variations in host antigen presentation influence viral control and provide a rational basis for epitope-based vaccine candidates aimed at eliciting robust helper T-cell responses across diverse cattle populations.

Bovine Leukemia Virus Infection Dynamics and Control publication trend

The graph below shows the total number of articles in bovine leukemia virus infection dynamics and control across all publications each year (not limited to Nature Index journals).

Technical terms

Provirus: Viral DNA integrated into the host genome, serving as the template for viral gene expression and persistence.

Antisense transcription: Synthesis of RNA from the strand opposite to the protein-coding sequence, often yielding regulatory non-coding transcripts.

Epitope: Short peptide segment of a viral protein recognised by T-cell receptors or antibodies when presented by MHC molecules.

BoLA-DRB3: A bovine major histocompatibility complex class II gene that presents exogenous peptides to CD4+ T cells.

Long non-coding RNA (lncRNA): RNA transcripts longer than 200 nucleotides that do not encode proteins but can regulate gene expression.

Proviral load: Quantity of viral DNA copies per unit of host genomic DNA, reflecting the magnitude of persistent infection.

References

1. Reduction of antisense transcription affects bovine leukemia virus replication and oncogenesis. PLOS Pathogens (2024).
2. An immunoinformatics study reveals a new BoLA-DR-restricted CD4+ T cell epitopes on the Gag protein of bovine leukemia virus. Scientific Reports (2023).
3. Herd-level prevalence of bovine leukemia virus, Salmonella Dublin and Neospora caninum in Alberta, Canada, dairy herds using ELISA on bulk tank milk samples. Journal of Dairy Science (2024).
4. The bovine leukemia virus-derived long non-coding RNA AS1-S binds to bovine hnRNPM and alters the interaction between hnRNPM and host mRNAs. Microbiology Spectrum (2023).
5. The Prevalence and Molecular Characterization of Bovine Leukemia Virus among Dairy Cattle in Henan Province, China. Viruses (2024).
6. Epidemiology and genetic diversity of bovine leukemia virus. Virology Journal (2017).
7. Mechanisms of pathogenesis induced by bovine leukemia virus as a model for human T-cell leukemia virus. Frontiers in Microbiology (2013).
8. BLV-CoCoMo-qPCR: Quantitation of bovine leukemia virus proviral load using the CoCoMo algorithm. Retrovirology (2010).