Oncogenic HPV E7 promotes the expression of a long noncoding RNA lnc-FANCI-2 via YY1 and miR-29a
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PROVIDER: PRJNA631542 | ENA |
REPOSITORIES: ENA
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Project description:Long noncoding RNAs (lncRNA) play diverse roles in biological processes, but their expression profiles and functions in cervical carcinogenesis remains unknown. By RNA-seq analyses of 18 clinical samples and validated by RT-qPCR analyses of 72 clinical samples, we provide the first evidence in this report that 194 lncRNAs are differentially regulated by high-risk HPV infection along with cervical lesion progression. One such lncRNA, lnc-FANCI-2, induced by high-risk HPV infection was carefully analyzed because it is expressed from the same chr 15q26.1 region of FANCI gene encoding an important DNA repair factor. We found a mutual regulation of lnc-FANCI-2 and FANCI in cervical cancer cells and high-risk E6 and mainly E7 for this upregulation independent of p53 and pRb/E2F1. In HPV16-positive CaSki cells, lnc-FANCI-2, primarily in the cytoplasm in ~10 copies per cell, is transcribed from two alternative promoters and polyadenylated at two alternative poly(A) sites. Alternative RNA splicing of lnc-FANCI-2 transcripts leads to produce 14 detectable RNA isoforms. YY1 interacts with viral E7 and transactivates the transcription by binding to two YY1-binding motifs in the lnc-FANCI-2 promoter. Knockdown of either YY1 or E7 expression led to significant reduction of lnc-FANCI-2 expression. The 3’ untranslational region of YY-1 RNA contains a consensus seed match to miR-29a and is sensitive to miR-29a-mediated inhibition of YY1 expression. High-risk HPV infections were found to induce YY1 expression in HPV18-infected HFKs by reduction of host miR-29a expression. Together, our data have provided novel insights into mechanisms of how high-risk HPVs contribute to cervical carcinogenesis.
2021-12-31 | GSE150227 | GEO
Project description:The life cycle of human papillomaviruses (HPV) is strictly linked to the differentiation of their natural host cells. The HPV E6 and E7 oncoproteins can delay the normal differentiation program of keratinocytes, however, the exact mechanisms responsible for this have not yet been identified. The goal of this study was to investigate the effects of HPV16 oncoproteins on the expression of genes involved in keratinocyte differentiation. Primary human keratinocytes transduced by LXSN (control) retroviruses or virus vectors expressing HPV16 E6, E7 or E6/E7 genes were subjected to gene expression profiling. The results of microarray analysis showed that HPV 16 E6 and E7 have the capacity to down-regulate the expression of several genes involved in keratinocyte differentiation. Quantitative real-time polymerase chain reaction (qRT-PCR) assays were performed to confirm microarray data. To investigate the effects of the HPV oncoproteins on the promoters of selected keratinocyte differentiation genes, luciferase reporter assays were performed. Our results suggest that the HPV 16 E6 and/or E7 oncogenes are able to down-regulate the expression of several genes involved in keratinocyte differentiation, at least partially by down-regulating their promoter activity. This activity of the HPV oncoproteins may have a role in the productive virus life cycle, and also in virus induced carcinogenesis. Primary human foreskin keratinocytes were transduced by retrovirus vectors containing HPV 16 E6, E7, E6/E7 or the control vector LXSN. The global gene expression patterns of transduced keratinocytes were analyzed on Affymetrix microarrays
2014-06-26 | E-GEOD-58841 | biostudies-arrayexpress
Project description:The life cycle of human papillomaviruses (HPV) is strictly linked to the differentiation of their natural host cells. The HPV E6 and E7 oncoproteins can delay the normal differentiation program of keratinocytes, however, the exact mechanisms responsible for this have not yet been identified. The goal of this study was to investigate the effects of HPV16 oncoproteins on the expression of genes involved in keratinocyte differentiation. Primary human keratinocytes transduced by LXSN (control) retroviruses or virus vectors expressing HPV16 E6, E7 or E6/E7 genes were subjected to gene expression profiling. The results of microarray analysis showed that HPV 16 E6 and E7 have the capacity to down-regulate the expression of several genes involved in keratinocyte differentiation. Quantitative real-time polymerase chain reaction (qRT-PCR) assays were performed to confirm microarray data. To investigate the effects of the HPV oncoproteins on the promoters of selected keratinocyte differentiation genes, luciferase reporter assays were performed. Our results suggest that the HPV 16 E6 and/or E7 oncogenes are able to down-regulate the expression of several genes involved in keratinocyte differentiation, at least partially by down-regulating their promoter activity. This activity of the HPV oncoproteins may have a role in the productive virus life cycle, and also in virus induced carcinogenesis.
2014-06-26 | GSE58841 | GEO
Project description:Human papillomavirus (HPV) genome integration into the host genome, blocking E2 expression and leading to overexpression of E6 and E7 viral oncogenes, is considered a major step in cervical cancer development. In high-risk HPVs, E6 and E7 oncogenes are expressed as a bicistronic pre-mRNA, with alternative splicing producing the ultimate mRNAs required for E6 and E7 translation. Given the number of alternative donor and acceptor splicing sites, ten E6/E7 different alternative transcripts might be formed for HPV16 and three for HPV18, although only six isoforms have been previously reported for HPV16. In the present work, we employ high-throughput sequencing of invasive cervical cancer transcriptome (RNA-Seq) to characterize the expression of the HPV genome in 24 invasive cervical cancers associated with HPV16 and HPV18 single infections. Based on high-resolution transcriptional maps, we herein report three viral gene expression patterns which might be associated with the presence of the viral genome in episomal and/or integrated stages. Alternative mRNAs splicing isoforms coding for E6 and E7 oncoproteins were characterized and quantified, and two novel isoforms were identified. Three major isoforms (E6*I, E6*II, and E6+E7) were detected for HPV16 and two for HPV18 (E6*I and E6+E7). Minor transcript isoforms, including the novel ones, were very rare in some tumor samples or were not detected. Our data suggested that minor transcript isoforms of E6/E7 do not play a relevant role in cervical cancer.
2019-08-06 | GSE91065 | GEO
Project description: Not available
| S-EPMC7826414 | biostudies-literature
Project description:Human papillomavirus (HPV) E6 and E7 oncoproteins are expressed at all stages of HPV-mediated carcinogenesis and are essential drivers of cancers caused by high-risk HPV. Some of the activities of HPV E6 and E7, such as their interactions with host cellular tumor suppressors, have been characterized extensively. There is less information about how high-risk HPV E6 and E7 alter cellular responses to cytokines that are present in HPV-infected tissues and are an important component of the tumor microenvironment. We used several models of HPV oncoprotein activity to assess how E6 and E7 alter the cellular response to the pro-inflammatory cytokine IL-1beta. Models of early-stage HPV infection (human keratinocytes expressing HPV16 E6 and E7) and models of established HPV-positive head and neck cancers (patient-derived xenografts, head and neck cancer cell lines) exhibited similar dysregulation of IL-1 pathway genes and suppressed responses to IL-1beta treatment. Such overlap in cell responses supports that changes induced by HPV E6 and E7 early in infection could persist and contribute to a dysregulated immune environment throughout carcinogenesis. HPV E6 and E7 also drove the upregulation of several suppressors of IL-1 cytokine signaling, including SIGIRR, both in primary keratinocytes and in cancer cells. SIGIRR knockout was insufficient to increase IL-1beta-dependent gene expression in the presence of HPV16 E6 and E7, suggesting that multiple suppressors of IL-1 signaling contribute to dampened IL-1 responses in HPV16-positive cells.
2022-10-31 | GSE211730 | GEO
Project description:Objective: In past decades, the role of high-risk HPV (HR-HPV) infection in cancer pathogenesis has been extensively studied. The viral E7 protein expressed in pre-malignant cells has been identified as an ideal target for immunological intervention. However, the cultivation of HPV in vitro remains a significant challenge, as well as the lack of methods for expressing the HPV E7 protein and generating replication-competent recombinant viral particles, which posed a major obstacle to further exploration of the function and carcinogenic mechanisms of the E7 oncoprotein. Therefore, it is imperative to investigate novel methodologies to construct replication-competent recombinant viral particles that express the HPV E7 protein to facilitate the study of its function. Methods: We initiated the construction of recombinant viral particles by utilizing the ccdB-Kan forward/reverse screening system in conjunction with the Red/ExoCET recombinant system. We followed the infection of C33A cells with the obtained recombinant virus to enable the continuous expression of HPV16 E7. Afterwards, the total RNA was extracted and performed transcriptome sequencing using RNA-Seq technology to identify differentially expressed genes associated with HPV-induced oncogenicity. Results: We successfully established replicative recombinant viral particles expressing HPV16 E7 stably and continuously. The C33A cells were infected with recombinant viral particles to achieve overexpression of the E7 protein. Subsequently, RNA-Seq analysis was conducted to assess the changes in host cell gene expression. The results revealed an upregulation of the CD36 gene, which is associated with the HPV-induced oncogenic pathways, including PI3K-Akt and p53 signaling pathway. qRT-PCR analysis futher identified that the upregulation of the CD36 gene due to the expression of HPV16 E7. Conclusion: The successful expression of HPV16 E7 in cells demonstrates that the replicated recombinant virus retains the replication and infection abilities of Ad4, while also upregulating the CD36 gene involved in the PI3K-Akt signaling and p53 pathways, thereby promoting cell proliferation. The outcome of this study provides a novel perspective and serves as a solid foundation for further exploration of HPV-related carcinogenesis and the development of replicative HPV recombinant vaccines capable of inducing protective immunity against HPV.
2023-10-11 | GSE240750 | GEO
Project description:Aberrant glycosylation is a characteristic of tumor cells. The expression of certain glycan structures has been associated with poor prognosis. In cervical carcinoma has been reported changes in the gene expression level of some glycogenes that has been associated with lymph invasion. Human papilloma virus (HPV) infection is one of the most important factors to develop cervical cancer. HPV oncoproteins E6 and E7 have been implicated in cervical carcinogenesis. The role of these oncoproteins in glycosylation changes has not been reported. To know the effect of these oncoproteins on glycogene expression we realized a partial silencing of oncogenes E6 and E7 in HeLa cells, we made a microarray expression assay and we identified glycogenes that modified its expression. The analysis showed alteration in some glycosylation pathways, like glycosphingolipid, O-glycan mucin-type, and O-glycan non mucin-type glycosylation. Our results suggest that E6 and E7 oncoproteins could modified glycosylation of structures implicated in proliferation, adhesion, and apoptosis.
2016-12-07 | GSE90930 | GEO
Project description:To investigate the extent of host methylome dysregulation by the human papillomavirus (HPV) oncoprotein E7, we performed methylome array analysis on normal immortalized keratinocytes from skin (NIKS), NIKS cells maintaining the HPV16 or 18 episomes (NIKS-16, NIKS-18, respectively), and NIKS cells maintaining the HPV-16 episome deficient in E7 expression (NIKS-16ΔE7).
2017-06-11 | GSE83261 | GEO
Project description:To investigate the extent of gene expression dysregulation by the human papillomavirus (HPV) oncoprotein E7, we performed global gene expression analysis on normal immortalized keratinocytes from skin (NIKS), NIKS cells maintaining the HPV16 or 18 episomes (NIKS-16, NIKS-18, respectively), and NIKS cells maintaining the HPV-16 episome deficient in E7 expression (NIKS-16ΔE7).
2017-06-11 | GSE83259 | GEO