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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 addition of a...

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...

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...

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...

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 processed and...

Translational Regulation

Translational Regulation

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,...

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Updated: Jun 24, 2026

High-throughput Screening for Chemical Modulators of Post-transcriptionally Regulated Genes

High-throughput Screening for Chemical Modulators of Post-transcriptionally Regulated Genes

Published on: March 3, 2015

tRNAs as regulators in gene expression.

Yan Li¹, Hui Zhou

¹Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory for Biocontrol, Sun Yan-Sen University, Guangzhou, 510275, China.

Science in China. Series C, Life Sciences

|March 19, 2009

Summary

This summary is machine-generated.

Transfer RNAs (tRNAs) are key to protein synthesis but also regulate gene expression. Uncharged tRNAs and tRNA fragments act as signaling molecules, influencing cellular responses to stress and impacting gene expression.

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Published on: September 17, 2019

Area of Science:

Molecular Biology
Genetics
Cell Biology

Background:

Transfer RNAs (tRNAs) are traditionally known as adaptor molecules essential for protein synthesis.
Emerging research reveals tRNAs possess additional regulatory roles beyond translation.
These non-canonical functions are critical for cellular adaptation to various stresses.

Purpose of the Study:

To explore the multifaceted roles of tRNAs in cellular processes.
To investigate how tRNAs regulate gene expression under stress conditions.
To understand the significance of tRNA modifications and fragments in cellular signaling.

Main Methods:

Analysis of tRNA aminoacylation levels under nutritional stress.
Studies on the retrograde movement of tRNAs from cytoplasm to nucleus.
Investigation of specific tRNA cleavage events in response to physiological or environmental stresses.

Main Results:

Uncharged tRNAs function as effector molecules, modulating global gene expression during stress.
Retrograde tRNA transport to the nucleus influences surveillance and reduces protein synthesis during starvation.
Specific tRNA cleavage generates signaling molecules (e.g., tRNA halves, sitRNAs) involved in gene expression modulation.

Conclusions:

tRNAs exhibit a broader functional spectrum than previously understood, extending beyond protein synthesis.
tRNA-derived fragments and altered aminoacylation states are crucial regulatory elements in cellular stress responses.
Further research into tRNA structural and functional diversity is vital for understanding genetic information expression.