[Sense of nonsense on the guard of the mRNA quality]

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Precise gene expression relies on mechanisms to remove damaged or unnecessary transcripts.
• Nonsense-Mediated mRNA Decay (NMD) is an evolutionarily conserved quality control pathway.
• NMD prevents the synthesis of potentially harmful proteins by degrading aberrant mRNAs with premature termination codons (PTC).

Purpose of the Study:

• To explore the multifaceted roles of Nonsense-Mediated mRNA Decay (NMD).
• To highlight NMD's function beyond degrading aberrant transcripts.
• To underscore NMD's involvement in physiological processes and its complexity.

Main Methods:

• Literature review of extensive studies in model organisms (yeast, C. elegans, flies, mammals).
• Analysis of established and newly identified NMD substrates.
• Examination of NMD's role in development and stress response.

Main Results:

• NMD targets not only aberrant mRNAs but also physiological mRNAs, noncoding RNAs, and genes encoding miRNA and snoRNA.
• The NMD pathway is implicated in crucial biological processes such as development and response to various stresses.
• Recent research has identified novel protein factors, revealing the intricate complexity of the NMD mechanism.

Conclusions:

• NMD is a fundamental cellular process with broad implications for gene regulation and organismal health.
• The scope of NMD substrates extends beyond faulty transcripts, encompassing a wide range of RNA molecules.
• The complexity of NMD, involving numerous protein factors, suggests its critical and diverse roles in cellular function.