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. 1988 Nov;62(11):4113–4122. doi: 10.1128/jvi.62.11.4113-4122.1988

Transcriptional activation of lck by retrovirus promoter insertion between two lymphoid-specific promoters.

H T Adler 1, P J Reynolds 1, C M Kelley 1, B M Sefton 1
PMCID: PMC253842  PMID: 2845126

Abstract

p56lck, a member of the src family of cytoplasmic tyrosine protein kinases, is expressed primarily in lymphoid cells. Previous RNase protection data demonstrated the existence of at least two lck mRNAs (type I and type II) with different 5' untranslated regions in most T cells. These have been found here to arise from two separate promoters. S1 nuclease analysis and primer extension were used to locate the site of initiation of type I lck mRNA. The nucleotide sequence of the region upstream of this start site contains no classical promoter motifs. A cDNA clone of type II lck mRNA was isolated. The promoter of this mRNA must be more than 10 kilobases upstream of the type I promoter region. In two murine thymoma cell lines, LSTRA and Thy19, lck is expressed at elevated levels as a result of Moloney murine leukemia virus retrovirus promoter insertion. p56lck is encoded in these cells by a hybrid virus-lck mRNA containing the 5' untranslated region of Moloney virus mRNA. The structures and the sites of integration of the proviruses upstream of lck in these cells were examined by molecular cloning and Southern analysis. A truncated and rearranged provirus, flanked by 554 nucleotides (nt) of duplicated cellular sequences, was found 962 nt upstream of the start site for type I lck mRNA in LSTRA cells. What appears to be a Moloney mink cytopathic focus-forming provirus was found between 584 to 794 nt upstream of the start site for type I lck mRNA in Thy19 cells. Thus in both tumor cell lines, viral DNA is present between the promoters for type I and type II lck mRNAs. Comparison of the sequences of the 5' ends of the lck and c-src genes suggests that divergence of these two genes involved exon shuffling and that a homolog of the neuronal c-src(+) exon is not present in lck.

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Selected References

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