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. 1988 Feb;62(2):376–386. doi: 10.1128/jvi.62.2.376-386.1988

Potential progenitor sequences of mink cell focus-forming (MCF) murine leukemia viruses: ecotropic, xenotropic, and MCF-related viral RNAs are detected concurrently in thymus tissues of AKR mice.

F Laigret 1, R Repaske 1, K Boulukos 1, A B Rabson 1, A S Khan 1
PMCID: PMC250546  PMID: 2826802

Abstract

Leukemogenic mink cell focus-forming (MCF) viruses of AKR mice are believed to originate in thymic tissue via recombination between ecotropic, xenotropiclike, and endogenous MCF-related murine leukemia virus (MuLV) sequences. We have previously used a synthetic 16-base-pair MCF env-specific oligomer probe to identify subgenomic MCF-related mRNAs present in the thymus tissues of AKR mice prior to the appearance of full-length (8.4-kilobase [kb]) recombinant MCF viral RNAs (A. S. Khan, F. Laigret, and C. P. Rodi, J. Virol. 61:876-882, 1987). These potential MCF env precursors consisted of 7.2-, 3.0-, and 1.8-kb RNA species. In this study, we have determined the structure of the MCF-related mRNAs on the basis of Northern (RNA) blot hybridization analyses by using 10 different MuLV subgenomic DNA probes, determined the nucleotide sequence of a cloned cDNA segment representing the 3' portion of the 7.2-kb mRNA, and studied the expression of ecotropic and xenotropic MuLV sequences by using env-specific DNA probes. The results indicated that ecotropic, xenotropic, and MCF-related transcripts were constitutively and concurrently expressed exclusively in thymus tissue of 2-month-old AKR mice prior to detection of MCF viral RNAs. We have molecularly characterized these thymic MuLV RNAs, which may participate in formation of recombinant MCF viruses; a novel recombinant ecotropic viral RNA was identified as a putative intermediate in the stepwise generation of leukemogenic MCF MuLVs. We have also described the unique structure of the 6.0-kb MCF-related RNAs which were expressed specifically in liver and kidney tissues of AKR mice; these RNAs contained an upstream non-MuLV transcriptional regulatory element.

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Selected References

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