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Regulation of Expression Occurs at Multiple Steps

Regulation of Expression Occurs at Multiple Steps

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...

Reporter Genes

Reporter Genes

Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.

Regulation of Expression at Multiple Steps

Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...

Regulated mRNA Transport

Regulated mRNA Transport

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...

What is Gene Expression?

What is Gene Expression?

A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...

What is Gene Expression?

What is Gene Expression?

Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...

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Related Experiment Video

Updated: May 1, 2026

In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression

In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression

Published on: March 29, 2019

Remote control of gene function by local translation.

Hosung Jung¹, Christos G Gkogkas², Nahum Sonenberg³

¹Department of Anatomy, Brain Research Institute, and Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 120-752, South Korea.

|April 1, 2014

Summary

RNA localization directs protein synthesis to specific cellular sites, crucial for cell function. This process, especially vital in neurons, ensures proper protein localization and homeostasis.

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Last Updated: May 1, 2026

In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression

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Published on: March 29, 2019

Quantitative Immunofluorescence to Measure Global Localized Translation

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Published on: April 30, 2014

Area of Science:

Molecular Biology
Cell Biology
Neuroscience

Background:

Protein function is intrinsically linked to its subcellular location.
RNA localization is an evolutionarily conserved mechanism controlling protein positioning.
Local mRNA translation enables on-site protein synthesis, influencing cellular signaling and proteome balance.

Purpose of the Study:

To review key findings in RNA localization and local translation.
To discuss the implications of spatial gene function control.
To highlight the significance of these mechanisms in neuronal compartments.

Main Methods:

Review of existing literature on RNA localization and local translation.
Analysis of studies demonstrating the role of localized mRNA and protein synthesis.
Discussion of experimental evidence and theoretical implications.

Main Results:

RNA localization ensures proteins are synthesized at specific subcellular sites.
Local translation confers unique signaling properties and maintains proteome homeostasis.
Dysregulation of RNA localization and translation leads to neuronal defects.

Conclusions:

RNA localization and local translation are fundamental for spatial control of gene function.
These mechanisms are particularly critical in distal neuronal compartments.
Understanding these processes offers insights into neuronal development, wiring, and survival.