Human Papillomavirus Type 16 E6 and E7 Gene Variations in Indian Cervical Cancer

2002 ◽  
Vol 87 (3) ◽  
pp. 268-273 ◽  
Author(s):  
M. Radhakrishna Pillai ◽  
S. Sreevidya ◽  
Brad H. Pollock ◽  
P.G. Jayaprakash ◽  
Brian Herman
2010 ◽  
Vol 84 (16) ◽  
pp. 8219-8230 ◽  
Author(s):  
Monika Somberg ◽  
Stefan Schwartz

ABSTRACT Our results presented here demonstrate that the most abundant human papillomavirus type 16 (HPV-16) mRNAs expressing the viral oncogenes E6 and E7 are regulated by cellular ASF/SF2, itself defined as a proto-oncogene and overexpressed in cervical cancer cells. We show that the most frequently used 3′-splice site on the HPV-16 genome, site SA3358, which is used to produce primarily E4, E6, and E7 mRNAs, is regulated by ASF/SF2. Splice site SA3358 is immediately followed by 15 potential binding sites for the splicing factor ASF/SF2. Recombinant ASF/SF2 binds to the cluster of ASF/SF2 sites. Mutational inactivation of all 15 sites abolished splicing to SA3358 and redirected splicing to the downstream-located, late 3′-splice site SA5639. Overexpression of a mutant ASF/SF2 protein that lacks the RS domain, also totally inhibited the usage of SA3358 and redirected splicing to the late 3′-splice site SA5639. The 15 ASF/SF2 binding sites could be replaced by an ASF/SF2-dependent, HIV-1-derived splicing enhancer named GAR. This enhancer was also inhibited by the mutant ASF/SF2 protein that lacks the RS domain. Finally, silencer RNA (siRNA)-mediated knockdown of ASF/SF2 caused a reduction in spliced HPV-16 mRNA levels. Taken together, our results demonstrate that the major HPV-16 3′-splice site SA3358 is dependent on ASF/SF2. SA3358 is used by the most abundantly expressed HPV-16 mRNAs, including those encoding E6 and E7. High levels of ASF/SF2 may therefore be a requirement for progression to cervical cancer. This is supported by our earlier findings that ASF/SF2 is overexpressed in high-grade cervical lesions and cervical cancer.


2015 ◽  
Vol 10 (1) ◽  
Author(s):  
Luc Magloire Anicet Boumba ◽  
Samira Zoa Assoumou ◽  
Lahoucine Hilali ◽  
Jean Victor Mambou ◽  
Donatien Moukassa ◽  
...  

2020 ◽  
Vol 23 (3) ◽  
pp. 374-385
Author(s):  
Tahere Azimi ◽  
◽  
Malihe Bagheri ◽  
Mahdi Pariyan ◽  
Behzad Khansarinejad ◽  
...  

Background and Aim: Cervical Cancer (CC) is the third most common malignancy in the women, the main cause of which is human papillomavirus (HPV). Both E6 and E7 oncogenes of the virus play an important role in its tumorigenesis. Today, methods available for screening CC are not capable of detecting the disease at an early stage. Therefore, it is important to identify new biomarkers for early detection of this cancer. For this purpose, in the present study, miRNAs targeting the two oncogenes E6 and E7 of human papillomavirus (types 16 and 18) were studied in CC by bioinformatics. Methods & Materials: First, using the NCBI database, the E6 and E7 gene sequences were obtained for both human papillomavirus types 16 and 18. Then, using the miRBase and RNA22 bioinformatics databases, the most appropriate targeting miRNAs for these genes were selected. Ethical Considerations: This study was approved by Ethics Committee of Arak University of Medical Sciences. Results: Based on the P obtained from bioinformatics databases, miRNA including miR-92a-5p (P=7.51e-2), miR-195-3p (P=2.24e-1), miR-34a-5p (P=2.73e-1) and miR-155-5p (P=4.95e-2) were introduced for the two genes E6 and E7. Conclusion: Results from bioinformatics studies revealed that of the four miRNAs identified, miR-155-5p and miR-92a-5p are probably the targeting miRNAs specific for the E6 and E7 genes, respectively. Therefore, it seems that these miRNAs can be a suitable candidate for in vitro studies in CC patients.


2000 ◽  
Vol 181 (5) ◽  
pp. 1764-1767 ◽  
Author(s):  
Ingo Nindl ◽  
Klaus Zumbach ◽  
Michael Pawlita ◽  
Karin Teller ◽  
Achim Schneider ◽  
...  

1996 ◽  
Vol 61 (1) ◽  
pp. 73-78 ◽  
Author(s):  
Susan Gross Fisher ◽  
Luis Benitez-Bribiesca ◽  
Ingo Nindl ◽  
Eggert Stockfleth ◽  
Martin Müller ◽  
...  

2015 ◽  
Vol 8 (2) ◽  
pp. 386-394 ◽  
Author(s):  
Samira Assoumou ◽  
Luc Boumba ◽  
Angelique Mbiguino ◽  
Barthelemy Mabika ◽  
Ernest Belembaogo ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document