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Aneta Pluta, Marzena Rola-Łuszczak, Monika Olech and Jacek Kuźmak

Abstract

In this study the sequences of the long terminal repeat (LTR) of field isolates of the bovine leukaemia virus (BLV) were analysed. These isolates came from emerging cases of BLV infection in cattle from herds having BLV-free status. We found several sequence variations within regulatory motifs in the LTRs like GRE, DAS and interferon binding site. These mutations can possibly affect transcriptional activity of the virus, leading to its silencing.

Open access

Monika Olech, Marzena Rola-Łuszczak, Bożenna Kozaczyńska, Piotr Kubiś, Aneta Pluta, Anna Gil and Jacek Kuźmak

Abstract

In the study, a 122 bp fragment of gag gene encoding immunodominant epitope on capsid protein of small ruminant lentiviruses (SRLVs) found in sheep was amplified by PCR and analysed by SSCP and sequencing. Out of 30 DNA samples, five showed different migration patterns, demonstrating the individual variations within gag sequences, which were confirmed afterwards by sequence analysis. In two samples nucleotide changes yielded amino acid substitutions highlighting the conservative nature of gag encoded immunoreactive epitope but also potencial insensitivity of a single-strain-based immunoassay.