Abstract
The role of noncoding transcripts in gene expression is nowadays acknowledged to keep
various diseases at bay—despite being referred to as “junk” DNA several years ago.
Believed to be at the heart of multiple regulatory pathways, microRNAs (miRNAs) are
small noncoding RNAs (ncRNAs) involved in posttranscriptional gene regulation. Recently,
the discovery of ncRNAs that compete for shared miRNA pools has dimmed the light on
the solo performance of miRNAs in genomic regulation. Indeed, several studies describe
RNAs such as long noncoding RNAs, mRNAs, circular RNAs, pseudogenes, and viral RNAs
as competing endogenous RNAs (ceRNAs) that sequester miRNAs, allowing for de-repression
of downstream miRNA targets. Such integration between coding and noncoding transcripts
forms complex ceRNA networks that when dysregulated lead to several diseases such
as hepatocellular carcinoma. Here, the authors review perturbed ceRNA networks in
hepatocellular carcinoma, describe the role of each in tumorigenesis, and discuss
their various clinical implications.
Keywords
competing endogenous RNAs - microRNAs - hepatocellular carcinoma