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. 1990 Apr;64(4):1825–1829. doi: 10.1128/jvi.64.4.1825-1829.1990

Analysis of human papillomavirus type 16 late mRNA 3' processing signals in vitro and in vivo.

I M Kennedy 1, J K Haddow 1, J B Clements 1
PMCID: PMC249323  PMID: 2157064

Abstract

In the human papillomavirus type 16 genome, three late mRNA putative 3' processing signals, designated LP1, LP2, and LP3, are located downstream of the late coding region. Our results show, both in vitro and in vivo, that in HeLa cells, the LP2 signal functions. Thus, the restriction in human papillomavirus type 16 late-gene expression observed in HeLa cells and other nondifferentiated epithelial cells is not achieved by regulation of late mRNA poly(A) site usage. Interestingly, alteration of three nucleotides in the GU-rich downstream sequence element converts the nonfunctional LP1 to an efficient 3' processing site, suggesting that LP1 may function in cell types other than HeLa, such as differentiated keratinocytes. Our transfection studies have identified a negative regulatory element located immediately upstream of the late mRNA 3' processing signals; this element was not associated with any alteration in 3' processing and may act as an mRNA instability element.

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Selected References

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