Identification of a long non-coding RNA-associated RNP complex regulating metastasis at the translational step

Area of Science:

• Molecular Biology
• Genetics
• Cancer Research

Background:

• Long non-coding RNAs (lncRNAs) are crucial regulators of gene expression in development and disease.
• While lncRNAs influence chromatin, transcription, and RNA decay, their role in translation regulation remains largely unexplored.
• Understanding lncRNA-mediated translational control is vital for deciphering complex gene regulatory networks in diseases like cancer.

Purpose of the Study:

• To identify and characterize novel lncRNAs involved in translational regulation.
• To investigate the role of a newly identified translational regulatory lncRNA (treRNA) in breast cancer progression.
• To elucidate the molecular mechanism by which treRNA affects gene expression and metastasis.

Main Methods:

• Genome-wide computational analysis to identify potential translational regulatory lncRNAs.
• Analysis of clinical breast cancer samples to assess treRNA expression levels.
• In vitro and in vivo experiments to evaluate the impact of treRNA on tumor invasion and metastasis.
• Investigation of treRNA's effect on E-cadherin mRNA translation and identification of associated protein complexes.

Main Results:

• Identification of a novel translational regulatory lncRNA (treRNA) upregulated in breast cancer metastasis.
• Demonstration that treRNA promotes tumor invasion and metastasis in vitro and in vivo.
• Evidence that treRNA suppresses E-cadherin mRNA translation, leading to reduced epithelial marker expression.
• Characterization of a specific ribonucleoprotein (RNP) complex involving hnRNP K, FXR1, FXR2, PUF60, and SF3B3 essential for treRNA function.

Conclusions:

• This study reveals a novel mechanism of gene regulation in cancer progression mediated by lncRNAs at the translational level.
• treRNA represents a potential therapeutic target for inhibiting breast cancer metastasis.
• The findings highlight the importance of translational control by lncRNAs in the context of cancer.