Design and application of circular RNAs with protein-sponge function.

Area of Science:

• Molecular Biology
• RNA Biology
• Genetics

Background:

• Circular RNAs (circRNAs) are noncoding RNAs with largely uncharacterized functions.
• Heterogeneous nuclear ribonucleoprotein L (hnRNP L) regulates alternative splicing through CA-rich RNA elements.

Purpose of the Study:

• To design and characterize artificial circRNAs as protein sponges.
• To investigate the ability of these circRNAs to inactivate hnRNP L and modulate splicing.

Main Methods:

• Design and expression of artificial circRNAs with CA-repeat or CA-rich sequences.
• Characterization of circRNA binding specificity and functional impact on hnRNP L.
• Analysis of splicing-regulatory networks and splicing factor distribution in mammalian cells.

Main Results:

• Artificial circRNAs efficiently and specifically bind and inactivate hnRNP L.
• Designer circRNAs modulate alternative splicing patterns in mammalian cells.
• Cellular distribution of splicing factors is altered by the engineered circRNAs.

Conclusions:

• Engineered circRNAs can serve as effective protein sponges for RNA-binding proteins like hnRNP L.
• This strategy offers a novel approach to control gene splicing.
• The method holds potential for developing new therapeutic strategies in molecular medicine.