Inefficient splicing of long non-coding RNAs is associated with higher transcript complexity in human and mouse

Area of Science:

• Molecular Biology
• Genomics
• RNA Biology

Background:

• Recent studies suggest long non-coding RNAs (lncRNAs) have less efficient splicing and fewer splice variants compared to messenger RNAs (mRNAs).
• Understanding the mechanisms and implications of lncRNA splicing is crucial for comprehending gene regulation.

Purpose of the Study:

• To investigate and compare the splicing efficiency and variant production between lncRNAs and mRNAs in humans and mice.
• To identify factors contributing to transcript complexity in lncRNAs.

Main Methods:

• Comparative analysis of lncRNA and mRNA splicing patterns.
• Examination of exon and intron lengths, splice site characteristics, and variant counts across species.

Main Results:

• lncRNAs demonstrate higher transcript complexity (more splice variants per exon) than mRNAs.
• Alternative last exon and exon skipping are primary drivers of lncRNA splice variant diversity.
• Higher transcript complexity in both lncRNAs and mRNAs correlates with shorter intron lengths.
• lncRNA transcript complexity is associated with longer exon lengths and specific 5'/3' splice site motifs (GC/AG).

Conclusions:

• Inefficient splicing in lncRNAs may paradoxically enhance their ability to produce multiple spliced products per exon.
• lncRNA splicing patterns contribute significantly to their functional diversity and regulatory potential.