Novel Transcript Discovery Expands the Repertoire of Pathologically-Associated, Long Non-Coding RNAs in Vascular...

Area of Science:

• Molecular Biology
• Genomics
• Cardiovascular Research

Background:

• Vascular smooth muscle cells (VSMCs) are key to vascular function but also implicated in cardiovascular diseases.
• Long non-coding RNAs (lncRNAs) significantly influence gene expression and cellular phenotypes.
• Current lncRNA databases lack comprehensive representation in pathological VSMC contexts.

Purpose of the Study:

• To improve the characterization of lncRNAs in VSMCs, particularly under pathological conditions.
• To identify and analyze non-reference lncRNAs in VSMCs stimulated in vitro and from atherosclerotic plaques.
• To assess the contribution of novel lncRNAs to VSMC function and disease.

Main Methods:

• RNA sequencing data from stimulated VSMCs and atherosclerotic plaques were analyzed.
• Non-reference transcripts were assembled and subjected to a lncRNA prediction pipeline.
• Expression patterns and genomic locations (e.g., enhancers) of predicted lncRNAs were investigated.

Main Results:

• Substantial improvement in lncRNA coverage, with non-reference lncRNAs comprising 21-32% of datasets.
• Non-reference lncRNAs showed enrichment in VSMCs and originated from enhancer regions.
• A significant portion (33-46%) of lncRNAs responding to pathological stimuli were novel discoveries.

Conclusions:

• Novel lncRNAs play a critical role in VSMC biology and cardiovascular pathologies.
• The discovery of non-reference lncRNAs significantly expands the known lncRNA repertoire in VSMCs.
• This work provides a foundation for prioritizing lncRNA candidates for further functional studies in disease.