Recently Evolved Tumor Suppressor Transcript TP73-AS1 Functions as Sponge of Human-Specific miR-941

Area of Science:

• Genetics
• Molecular Biology
• Evolutionary Biology

Background:

• MicroRNA (miRNA) sponges are crucial for gene regulation, but few have been identified.
• The TP73-AS1 transcript is a recently evolved noncoding RNA with tumor suppressor functions.

Purpose of the Study:

• To investigate the function of TP73-AS1 as a potential miRNA sponge.
• To explore the evolutionary origin and regulatory role of the TP73-AS1 and miR-941 interaction.

Main Methods:

• Bioinformatic analysis of TP73-AS1 and miR-941 binding sites.
• Transcriptome data analysis across various tissues.
• In vitro experiments including wound-healing assays and Argonaute protein immunoprecipitation.

Main Results:

• TP73-AS1 contains nine high-affinity binding sites for human-specific miR-941, forming an efficient sponge.
• The miR-941 sponge region evolved rapidly in humans from a primate precursor.
• Inverse correlation between TP73-AS1 and miR-941 expression in healthy and cancerous tissues, with miR-941 upregulated in tumors.

Conclusions:

• The TP73-AS1/miR-941 system represents a rapidly evolved regulatory mechanism.
• This interaction influences cell migration, proliferation, and tumorigenesis.
• Highlights the significance of noncoding RNA evolution in human-specific regulatory pathways.