Very long intergenic non-coding (vlinc) RNAs directly regulate multiple genes in cis and trans

Area of Science:

• Genomics
• Molecular Biology
• RNA Biology

Background:

• The majority of the human genome is transcribed into long non-coding RNAs (lncRNAs).
• The functions and biological significance of lncRNAs are not well understood due to challenges in studying them.
• Existing methods for lncRNA research often lack cross-validation, leading to ambiguity in results.

Purpose of the Study:

• To develop and apply a genome-wide strategy for functional annotation of lncRNAs.
• To identify regulatory networks of lncRNAs by integrating multiple experimental approaches.
• To investigate the function and regulatory mechanisms of a novel subclass of lncRNAs called very long intergenic non-coding RNAs (vlincRNAs).

Main Methods:

• Genome-wide functional annotation strategy for lncRNAs.
• Integration of co-expression analysis, lncRNA-chromatin interaction mapping, and CRISPR/Cas13-mediated knockdown.
• Application of the strategy to annotate 407 vlincRNAs.

Main Results:

• vlincRNAs regulate genes involved in RNA processing, development, cell cycle, and cellular adhesion.
• Regulation occurs via nuclear proximity between vlincRNAs and their targets, affecting genes in cis and trans.
• vlincRNA networks are implicated in DNA damage response and cancer cell survival under genotoxic stress.

Conclusions:

• This study provides strong evidence for the regulatory role of vlincRNAs.
• vlincRNAs represent a significant, previously underappreciated layer of RNA-based gene regulation.
• The findings highlight the importance of vlincRNAs in complex biological systems and cancer.