Functional interplay between RNA-binding protein HuR and microRNAs

Area of Science:

• Molecular Biology
• Post-transcriptional Regulation
• Gene Expression Control

Background:

• The RNA-binding protein HuR (Human antigen R) binds to numerous messenger RNAs (mRNAs) involved in critical cellular functions.
• HuR's known roles include stabilizing mRNAs and modulating translation, but the precise mechanisms were unclear.
• Recent findings highlight the crucial interplay between HuR and microRNAs in determining mRNA fate.

Purpose of the Study:

• To review the complex interactions between HuR and microRNAs.
• To elucidate how these interactions govern the expression of shared target mRNAs.
• To discuss the reciprocal regulation between HuR and microRNAs.

Main Methods:

• Literature review of recent evidence on HuR-microRNA interactions.
• Analysis of competitive and cooperative binding mechanisms.
• Discussion of transcriptome-wide data and emerging regulatory pathways.

Main Results:

• HuR and microRNA interactions can be competitive or cooperative, leading to differential gene expression outcomes.
• Competition typically enhances gene expression if HuR binding dominates, or represses it if microRNA binding prevails.
• Cooperation between HuR and microRNAs generally results in decreased expression of shared target mRNAs.

Conclusions:

• MicroRNAs significantly influence HuR's post-transcriptional regulation of target mRNAs.
• The interplay between HuR and microRNAs provides versatility and robustness to gene expression.
• Understanding these interactions is key to comprehending cellular regulation and disease processes.