Intron Retention: A Reemerging Paradigm in RNA Biology and Post-Transcriptional Gene Regulation

Area of Science:

• Molecular Biology
• Genetics
• Gene Regulation

Background:

• Intron Retention (IR) was historically dismissed as non-functional splicing noise.
• Recent research recognizes IR as a conserved, dynamic mechanism of post-transcriptional gene regulation.

Purpose of the Study:

• To review the current understanding of Intron Retention (IR) in gene regulation.
• To explore the regulatory mechanisms, functional roles, and detection methods of IR.
• To summarize IR's involvement in normal development and disease states.

Main Methods:

• Review of existing literature on Intron Retention.
• Analysis of experimental and computational tools for IR detection (e.g., RNA-seq, RT-PCR, IRFinder, IntEREst).

Main Results:

• IR selectively retains intronic sequences, impacting mRNA stability, localization, and translation.
• IR is regulated by various factors including splice site strength, chromatin structure, and RNA polymerase II dynamics.
• Dysregulated IR is associated with diseases such as cancer, neurodegeneration, and immune dysfunction.

Conclusions:

• IR is a crucial regulatory mechanism with significant roles in cellular processes and development.
• Understanding IR is vital for insights into normal physiology and pathological conditions.
• Advanced tools facilitate the detection and functional analysis of IR events across the transcriptome.