Circles reshaping the RNA world: from waste to treasure

Area of Science:

• Molecular Biology
• Genetics
• RNA Biology

Background:

• Circular RNAs (circRNAs) are a newly identified class of RNA molecules derived from genes previously thought to produce only messenger or linear noncoding RNAs.
• Their discovery has significantly altered the understanding of noncoding RNAs, moving them from perceived transcriptional byproducts to functionally significant molecules.
• circRNAs exhibit tissue-specific expression patterns and dynamic changes during cell differentiation.

Purpose of the Study:

• To review the classification, biogenesis, and metabolism of circRNAs.
• To summarize the known and potential functions of circRNAs, including their roles in gene regulation.
• To explore the implications of circRNAs in tumorigenesis and their potential as targets for cancer therapy.

Main Methods:

• Literature review and synthesis of existing research on circRNAs.
• Analysis of circRNA expression profiles across different cell types and diseases.
• Examination of the molecular mechanisms underlying circRNA functions, such as the sponge effect and post-transcriptional regulation.

Main Results:

• circRNAs possess diverse biological functions, including acting as miRNA sponges, regulating post-transcriptional processes, and undergoing translation.
• Their regulatory roles are integrated within complex networks involving mRNAs, miRNAs, and proteins.
• circRNAs are implicated in various cellular processes and diseases, with a notable emphasis on their role in cancer.

Conclusions:

• circRNAs are ubiquitous and play critical roles in cellular regulation and disease pathogenesis, especially in oncology.
• Further research is needed to fully elucidate the functions of circRNAs and harness their potential for clinical applications, particularly in cancer targeted therapy.