The quantitative impact of 3'UTRs on gene expression

Area of Science:

• Molecular Biology
• Genetics
• Gene Regulation

Background:

• Gene expression control is crucial in biology.
• Post-transcriptional regulation, particularly by 3' untranslated regions (3'UTRs), is a key mechanism.
• Mammalian 3'UTRs contain substantial regulatory information.

Purpose of the Study:

• To develop and validate a massively parallel reporter assay (MPRA) for assessing 3'UTR function.
• To comprehensively evaluate the impact of over 1400 human 3'UTRs on RNA abundance, stability, translation, and protein output.
• To model the contributions of RNA abundance and translational efficiency to 3'UTR-mediated gene regulation.

Main Methods:

• Development of an accurate massively parallel reporter assay (MPRA) system.
• Evaluation of >1400 full-length human 3'UTRs.
• Analysis of RNA abundance, stability, translational regulation, and total protein output.
• Modeling of regulatory contributions and identification of sequence motifs.

Main Results:

• MPRA results showed consistency with endogenous transcript regulation.
• 3'UTR-mediated regulation involves a significant contribution from translational control, alongside RNA decay.
• Relationships were found between GC content, 3'UTR length, and regulatory modes.
• Specific sequence motifs linked to RNA-binding proteins were identified.
• Promoter-specific differences in post-transcriptional regulation were observed for certain 3'UTRs.

Conclusions:

• The developed MPRA system accurately characterizes 3'UTR-mediated regulation.
• Translational control plays a larger role in 3'UTR function than previously appreciated.
• This comprehensive dataset provides insights into the quantitative aspects of 3'UTR-mediated gene expression.