Abstract
The molecular mechanism by which feline leukaemia virus (FeLV) induces lymphoid malignancy in domestic cats is largely unknown1. Using the insertional activation model of c-myc by avian leukosis virus in the induction of bursal lymphoma in chickens2,3, we have now characterized the c-myc locus in feline tissues and investigated the possibility that FeLV may also insert within feline c-myc. We used the 1.5 kilobase (kb) PstI fragment of MC29 v-myc in Southern blot analysis to characterize the structure of the c-myc locus in the DNA of 31 naturally occurring feline lymphomas. Analysis of a cloned c-myc gene from one lymphoma demonstrated that sequences homologous to v-myc occupy 2.6 kb of feline DNA in which a putative intron of 0.5 kb separates sequences homologous to the 5′ and 3′ exons represented in avian v-myc4,5. We also observed in the DNA of this lymphoma tumour-specific fragments homologous to v-myc. Characterization of these molecularly cloned myc-hybridizing fragments revealed the presence of at least two identical FeLV proviruses 5.5 kb in length, each containing long terminal repeats enclosing a spliced version of the feline myc gene.
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Levy, L., Gardner, M. & Casey, J. Isolation of a feline leukaemia provirus containing the oncogene myc from a feline lymphosarcoma. Nature 308, 853–856 (1984). https://doi.org/10.1038/308853a0
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DOI: https://doi.org/10.1038/308853a0
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