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A transcribed ultra-conserved noncoding RNA, uc.285+, promotes colorectal cancer proliferation via directly binding mRNA

ABSTRACT: To further explore the differential expression profile of Transcribed ultra-conserved region (TUCR) in human colorectal cancer, we have employed TUCR microarray expression profiling as a discovery platform to identify potential differential expression profile of TUCR between human colorectal cancer tissue (CCRT) and human normal mucosal epithelial tissue of the colorectal (NT). Results showed that multiple differentially expressed TUCRs were found between CCRT and NT. In this study, We selected T-UCRs with large differences to verification and found that uc.285+ upregulation was most obvious. Then we further explored the biological function and mechanism of uc.285+ in colorectal cancer.

ORGANISM(S): Homo sapiens

PROVIDER: GSE167326 | GEO | 2021/06/15

REPOSITORIES: GEO

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Project description:Ultraconserved regions (UCRs) are segments of the human genome located in both intragenic and intergenic regions that are highly conserved in orthologous regions of the human, rat, and mouse genomes. Their transcriptional products, called T-UCRs, compose a new category of long noncoding RNA (lncRNAs). Most importantly, recent data suggests that T-UCRs are altered at the transcriptional level in human tumorigenesis and the aberrant T-UCRs expression profiles can be used to differentiate human cancer types. MicroRNAs and other types of non-codingRNAs have been shown to greatly contribute at biological function of cancer and are increasingly being used to help prognosticate patients with bladder cancer, this is not yet the case for T-UCRs. The presence and the roles for T-UCRs across different species is largely unknown rendering their investigation particularly important in our understanding the biology of cancer. Using genome-wide profiling, we identified 293 T-UCRs that were dysregulated in bladder tumor (n = 24) but not normal bladder tissues (n = 17) samples. The greatest change in expression was for the ultraconserved element 8 (uc.8+), whose expression significantly increased (6.7 fold; P = 0.001) in bladder cancer tissues. Dysregulated expression was validated for several T-UCRs in 60 patients and 16 healthy donors. We found that T-UCR 8+ acts as a natural decoy RNA for miR-596 in patients and bladder cancer cells. As a result, expression of matrix metallopeptidase 9, a direct target of this microRNA, was upregulated, thereby promoting cancer cell growth, migration, and invasion. We also observed that mir-596 mediated a network of interactions among uc.8+, uc.339+, uc.195+, and uc.388+, which appeared to be dysregulated in bladder tumors. Transcribed ultraconserved ncRNAs provide an evolutionarily-conserved regulatory layer that modulates miRNA levels, and opens up the possibility for the development of useful markers for diagnosis and prognosis, as well as for the development of new RNA-based cancer therapies.

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A transcribed ultra-conserved noncoding RNA, uc.285+, promotes colorectal cancer proliferation via directly binding mRNA

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