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. 1978 May;26(2):468–478. doi: 10.1128/jvi.26.2.468-478.1978

Size analysis and relationship of murine leukemia virus-specific mRNA's: evidence for transposition of sequences during synthesis and processing of subgenomic mRNA.

H Fan, I M Verma
PMCID: PMC354084  PMID: 660721

Abstract

Virus-specific mRNA from purified polyribosomes of mouse cells infected with Moloney murine leukemia virus (M-MuLV) was analyzed by electrophoresis in agarose gels, followed by hybridization of gel slices with M-MuLV-specific complementary DNA (cDNA). The size resolution of the gels was better than that of sucrose gradients used in previous analyses, and two virus-specific mRNA's of 38S and 24S were detected. The 24S virus-specific mRNA is predominantly derived from the 3' half of the M-MuLV genome, since cDNAgag(pol) (complementary to the 5' half of the M-MuLV genome) could not efficiently anneal with this mRNA. However, sequences complementary to cDNA synthesized from the extreme 5' end of M-MuLV 38S RNA (cDNA 5') are present in the 24S virus-specific mRNA, since cDNA 5' (130 nucleotides) efficiently annealed with this mRNA. The annealing of cDNA 5' was not due to repetition of 5' terminal nucleotide sequences at the 3' end of M-MuLV 38S RNA, since smaller cDNA 5' molecules (60 to 70 nucleotides), which likely lack the terminal repetition, also efficiently annealed with the 24S mRNA. The sequences in 24S virus-specific mRNA recognized by cDNA 5' are not present in 3' fragments of virion RNA that are the same length. Therefore, it appears that RNA sequences from the extreme 5' end of the M-MuLV genome may be transposed to sequences from the 3' half of the M-MuLV 38S RNA during synthesis and processing of the 24S virus-specific mRNA. These results may indicate a phenomenon similar to the RNA splicing processes that occur during synthesis of adenovirus and papovavirus mRNA's.

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Selected References

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