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. 1990 Jul;64(7):3455–3462. doi: 10.1128/jvi.64.7.3455-3462.1990

flvi-1, a common integration domain of feline leukemia virus in naturally occurring lymphomas of a particular type.

K S Levesque 1, L Bonham 1, L S Levy 1
PMCID: PMC249607  PMID: 2161948

Abstract

A locus in feline DNA, termed flvi-1, which may play an important role in the natural induction of lymphomas by feline leukemia virus (FeLV) was identified. Examination of a bank of 21 naturally occurring FeLV-positive feline lymphomas revealed that FeLV proviral integration occurs at flvi-1 in four independent tumors (19%). Independent integrations occurred within a 2.4-kilobase region of flvi-1, the probability of which by random chance can be estimated as 10(-16). Several lines of evidence, including sequence analysis of the long terminal repeat, demonstrated that proviruses integrated at flvi-1 are exogenously acquired and are oriented in the same transcriptional direction with respect to the locus. Molecularly cloned flvi-1 did not hybridize with probes representing several previously described proviral integration domains or with probes representing 10 oncogenes. The natural feline lymphomas examined in this study were heterogeneous with respect to tissue of origin, cell type, and number of monoclonal proviral integrations. The four tumors in which flvi-1 is interrupted were classified as members of a phenotypic subgroup containing seven lymphomas, i.e., at least four (57%) of seven lymphomas of this type contained FeLV proviral integration at flvi-1. Members of this phenotypic subgroup are non-T-cell lymphomas isolated from the spleen and contain an average of three proviruses, compared with an average of eight among all of the tumors examined. The small number of proviral integrations in tumors of this subgroup suggests that an early proviral integration event into flvi-1 can induce malignant change.

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Selected References

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