Related Experiment Video
Updated: Aug 13, 2025
10:24
Visualization of Endoplasmic Reticulum Localized mRNAs in Mammalian Cells
Published on: December 17, 2012
14.4K
De-centralizing the Central Dogma: mRNA translation in space and time
Ashley M Bourke1, Andre Schwarz1, Erin M Schuman1
1Max Planck Institute for Brain Research, Max von Laue Strasse 4, 60438 Frankfurt, Germany.
Molecular Cell
|January 20, 2023
Summary
Cellular mRNA localization enables targeted protein synthesis within specific subcellular compartments. This review explores the advantages, mechanisms, and regulation of local translation, highlighting mRNA features and ribosome activity.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Cellular operations are increasingly understood to occur in localized domains.
- These domains contain the necessary machinery for specific cellular functions.
- mRNA localization and translation are critical, yet complex, cellular processes.
Purpose of the Study:
- To review the phenomenon of mRNA localization and translation within subcellular compartments.
- To elucidate the conceptual advantages and mechanisms driving local translation.
- To provide a comprehensive overview of the regulation of this process.
Main Methods:
- Literature review of existing research on mRNA localization and translation.
- Analysis of the features of localized mRNAs and their transport mechanisms.
- Evaluation of the roles of ribosomes and translation factors in local protein synthesis.
Main Results:
- Subcellular localization of mRNA allows for spatially regulated protein synthesis.
- Specific mRNA sequences and cis-acting elements mediate transport and localization.
- Translation factors and ribosome composition are key regulators of local translation efficiency.
Conclusions:
- Local translation offers significant advantages for cellular function and regulation.
- Understanding mRNA localization mechanisms is crucial for deciphering cellular organization.
- Further research into translation factors and ribosome dynamics will illuminate local protein synthesis.
Related Concept Videos
02:22Regulated mRNA Transport
6.3K
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
6.3K
01:25The Central Dogma
127.5K
Overview
127.5K
02:24Regulation of Expression Occurs at Multiple Steps
23.0K
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
23.0K
01:29Translational Regulation
69
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
69
02:33Initiation of Translation
34.3K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
34.3K
02:28Leaky Scanning
5.2K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.2K