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    Differential regulation of different human papilloma virus variants by the POU family transcription factor Brn-3a

    Ndisang, D. and Faulkes, D.J. and Gascoyne, D.M. and Lee, S.A. and Ripley, B.J. and Sindos, M. and Singer, A. and Budhram-Mahadeo, V. and Cason, J. and Latchman, David S. (2006) Differential regulation of different human papilloma virus variants by the POU family transcription factor Brn-3a. Oncogene 25 (1), pp. 51-60. ISSN 0950-9232.


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    The Brn-3a POU family transcription factor is over-expressed in human cervical carcinoma biopsies and is able to activate expression of the human papilloma virus type 16 (HPV-16) upstream regulatory region (URR), which drives the expression of the E6 and E7 oncoproteins. Inhibition of Brn-3a expression in human cervical cancer cells inhibits HPV gene expression and reduces cellular growth and anchorage independence in vitro as well as the ability to form tumours in vivo. Here we show that Brn-3a differentially regulates different HPV-16 variants that have previously been shown to be associated with different risks of progression to cervical carcinoma. In human cervical material Brn-3a levels correlate directly with HPV E6 levels in individuals infected with a high risk variant of HPV-16 whereas this is not the case for a low risk variant. Moreover, the URRs of high and intermediate risk variants are activated by Brn-3a in transfection assays whereas the URR of a low risk variant is not. The change of one or two bases in a low risk variant URR to their equivalent in a higher risk URR can render the URR responsive to Brn-3a and vice versa. These results help explain why the specific interplay between viral and cellular factors necessary for the progression to cervical carcinoma, only occurs in a minority of those infected with HPV-16.


    Item Type: Article
    Additional Information: This is an author-produced version of a paper published in Oncogene:
    Keyword(s) / Subject(s): Brn-3a, HPV16, cervical cancer, URR, E6
    School: Birkbeck Professional Services > Vice-Chancellor's Office
    Depositing User: Sandra Plummer
    Date Deposited: 11 Dec 2006
    Last Modified: 02 Aug 2023 16:47


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