Oncogenic HPV E7 promotes the expression of a long noncoding RNA lnc-FANCI-2 via YY1 and miR-29a

ABSTRACT: 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.

ORGANISM(S): Homo sapiens

PROVIDER: GSE150227 | GEO | 2021/12/31

REPOSITORIES: GEO