To kill a microRNA: emerging concepts in target-directed microRNA degradation
Amber F Buhagiar1, Benjamin Kleaveland1
1Department of Pathology and Lab Medicine, Weill Cornell Medicine, New York, NY10065, USA.
Nucleic Acids Research
|January 15, 2024
Summary
Trigger RNAs degrade microRNAs (miRNAs) through target-directed miRNA degradation (TDMD). This process involves ZSWIM8 E3 ubiquitin ligase and is crucial for regulating gene expression in animals.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- MicroRNAs (miRNAs) regulate gene expression by binding mRNA targets via Argonaute (AGO) proteins.
- While most miRNA-AGO interactions destabilize mRNA, some trigger RNAs degrade the miRNA itself.
- Trigger RNAs exhibit higher complementarity to miRNAs than typical miRNA targets.
Approach:
- This review synthesizes recent findings on the mechanism and function of Target-Directed miRNA Degradation (TDMD).
- It details the role of ZSWIM8 E3 ubiquitin ligase in recruiting the degradation machinery.
- The review outlines common characteristics of trigger RNAs and validation methodologies.
Key Points:
- Target-directed miRNA degradation (TDMD) is a regulatory pathway where specific trigger RNAs lead to miRNA destruction.
- ZSWIM8 E3 ubiquitin ligase is central to TDMD, mediating AGO protein ubiquitination and proteolysis.
- Hundreds of trigger RNAs and over 100 miRNAs are regulated by ZSWIM8 in bilaterian animals.
Conclusions:
- TDMD plays significant roles in development and physiology across diverse organisms.
- Understanding trigger RNA features and validation is key to advancing TDMD research.
- Further investigation is needed to address outstanding questions in the TDMD field.
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