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Published on: December 13, 2014
Beyond quality control: The role of nonsense-mediated mRNA decay (NMD) in regulating gene expression
Sofia Nasif1, Lara Contu2, Oliver Mühlemann1
1Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland.
Abstract:
Nonsense-mediated mRNA decay (NMD) has traditionally been described as a quality control system that rids cells of aberrant mRNAs with crippled protein coding potential. However, transcriptome-wide profiling of NMD deficient cells identified a plethora of seemingly intact mRNAs coding for functional proteins as NMD targets. This led to the view that NMD constitutes an additional post-transcriptional layer of gene expression control involved in the regulation of many different biological pathways. Here, we review our current knowledge about the role of NMD in embryonic development and tissue-specific cell differentiation. We further summarize how NMD contributes to balancing of the integrated stress response and to cellular homeostasis of splicing regulators and NMD factors through auto-regulatory feedback loops. In addition, we discuss recent evidence that suggests a role for NMD as an innate immune response against several viruses. Altogether, NMD appears to play an important role in a broad spectrum of biological pathways, many of which still remain to be discovered.
Insights
Nonsense-mediated mRNA decay (NMD) removes faulty mRNAs but also regulates functional ones. This review explores NMD's roles in development, stress response, and immunity, highlighting its broad biological significance.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Nonsense-mediated mRNA decay (NMD) traditionally viewed as a cellular quality control mechanism.
- Recent studies reveal NMD targets numerous functional mRNAs, suggesting broader regulatory roles.
- This implies NMD extends beyond eliminating aberrant transcripts.
Purpose of the Study:
- To review the multifaceted roles of NMD in biological processes.
- To highlight NMD's involvement in gene expression regulation.
- To discuss emerging functions of NMD.
Main Methods:
- Review of existing literature on NMD.
- Analysis of transcriptome-wide profiling data from NMD-deficient cells.
- Synthesis of findings on NMD's functions.
Main Results:
- NMD regulates embryonic development and cell differentiation.
- NMD balances the integrated stress response and maintains homeostasis of key cellular factors.
- Evidence suggests NMD acts as an innate immune mechanism against viral infections.
Conclusions:
- NMD is a critical regulatory pathway with diverse functions.
- NMD plays significant roles in development, cellular homeostasis, and immunity.
- Further research is needed to uncover the full spectrum of NMD's biological roles.
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